Release 2.273.1 runner

* Add File Runner Commands

.github/workflows/build.yml

@@ -1,9 +1,10 @@
 name: Runner CI
 
 on:
+  workflow_dispatch:
   push:
     branches:
-    - master
+    - main
     - releases/*
     paths-ignore:
     - '**.md'    

.github/workflows/release.yml

@@ -1,13 +1,14 @@
 name: Runner CD
 
 on:
+  workflow_dispatch:
   push:
     paths:
     - releaseVersion
   
 jobs:
   check:
-    if: startsWith(github.ref, 'refs/heads/releases/') || github.ref == 'refs/heads/master'
+    if: startsWith(github.ref, 'refs/heads/releases/') || github.ref == 'refs/heads/main'
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2

README.md

@@ -6,7 +6,7 @@
 
 [![Actions Status](https://github.com/actions/runner/workflows/Runner%20CI/badge.svg)](https://github.com/actions/runner/actions)
 
-The runner is the application that runs a job from a GitHub Actions workflow.  The runner can run on the [hosted machine pools](https://github.com/actions/virtual-environments) or run on [self-hosted environments](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/about-self-hosted-runners).
+The runner is the application that runs a job from a GitHub Actions workflow. It is used by GitHub Actions in the [hosted virtual environments](https://github.com/actions/virtual-environments), or you can [self-host the runner](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/about-self-hosted-runners) in your own environment.
 
 ## Get Started
 

docs/adrs/0549-composite-run-steps.md

@@ -1,10 +1,8 @@
-# ADR 054x: Composite Run Steps
+# ADR 0549: Composite Run Steps
 
 **Date**: 2020-06-17
 
-**Status**: Proposed
-
-**Relevant PR**: https://github.com/actions/runner/pull/549
+**Status**: Accepted
 
 ## Context
 
@@ -12,18 +10,39 @@ Customers want to be able to compose actions from actions (ex: https://github.co
 
 An important step towards meeting this goal is to build in functionality for actions where users can simply execute any number of steps. 
 
-## Guiding Principles
+### Guiding Principles
 
 We don't want the workflow author to need to know how the internal workings of the action work. Users shouldn't know the internal workings of the composite action (for example, `default.shell` and `default.workingDir` should not be inherited from the workflow file to the action file). When deciding how to design certain parts of composite run steps, we want to think one logical step from the consumer.
 
-A composite action is treated as **one** individual job step (aka encapsulation).
-
+A composite action is treated as **one** individual job step (this is known as encapsulation).
 
 ## Decision
 
 **In this ADR, we only support running multiple run steps in an Action.** In doing so, we build in support for mapping and flowing the inputs, outputs, and env variables (ex: All nested steps should have access to its parents' input variables and nested steps can overwrite the input variables).
 
-## Steps
+### Composite Run Steps Features
+This feature supports at the top action level:
+- name
+- description
+- inputs
+- runs
+- outputs
+
+This feature supports at the run step level:
+- name
+- id
+- run
+- env
+- shell
+- working-directory
+
+This feature **does not support** at the run step level:
+- timeout-minutes
+- secrets
+- conditionals (needs, if, etc.)
+- continue-on-error
+
+### Steps
 
 Example `workflow.yml`
 
@@ -51,7 +70,9 @@ runs:
   using: "composite"
   steps:
     - run: pip install -r requirements.txt
+      shell: bash
     - run: npm install
+      shell: bash
 ```
 
 Example Output
@@ -65,7 +86,70 @@ echo hello world 4
 
 We add a token called "composite" which allows our Runner code to process composite actions. By invoking "using: composite", our Runner code then processes the "steps" attribute, converts this template code to a list of steps, and finally runs each run step sequentially. If any step fails and there are no `if` conditions defined, the whole composite action job fails. 
 
-## Inputs
+### Defaults
+
+We will not support "defaults" in a composite action. 
+
+### Shell and Working-directory
+
+For each run step in a composite action, the action author can set the `shell` and `working-directory` attributes for that step. The shell attribute is **required** for each run step because the action author does not know what the workflow author is using for the operating system so we need to explicitly prevent unknown behavior by making sure that each run step has an explicit shell **set by the action author.** On the other hand, `working-directory` is optional. Moreover, the composite action author can map in values from the `inputs` for it's `shell` and `working-directory` attributes at the step level for an action. 
+
+For example,
+
+`action.yml`
+
+
+```yaml
+inputs:
+  shell_1:
+    description: 'Your name'
+    default: 'pwsh'
+steps:
+  - run: echo 1
+    shell: ${{ inputs.shell_1 }}
+```
+
+Note, the workflow file and action file are treated as separate entities. **So, the workflow `defaults` will never change the `shell` and `working-directory` value in the run steps in a composite action.** Note, `defaults` in a workflow only apply to run steps not "uses" steps (steps that use an action).
+
+### Running Local Scripts
+
+Example 'workflow.yml':
+```yaml
+jobs:
+  build:
+    runs-on: self-hosted
+    steps:
+    - uses: user/composite@v1
+```
+
+Example `user/composite/action.yml`:
+
+```yaml
+runs:
+  using: "composite"
+  steps: 
+    - run: chmod +x ${{ github.action_path }}/test/script2.sh
+      shell: bash
+    - run: chmod +x $GITHUB_ACTION_PATH/script.sh
+      shell: bash
+    - run: ${{ github.action_path }}/test/script2.sh
+      shell: bash
+    - run: $GITHUB_ACTION_PATH/script.sh
+      shell: bash
+```
+Where `user/composite` has the file structure:
+```
+.
++-- action.yml
++-- script.sh
++-- test
+|   +-- script2.sh
+```
+
+
+Users will be able to run scripts located in their action folder by first prepending the relative path and script name with `$GITHUB_ACTION_PATH` or `github.action_path` which contains the path in which the composite action is downloaded to and where those "files" live. Note, you'll have to use `chmod` before running each script if you do not git check in your script files into your github repo with the executable bit turned on.
+
+### Inputs
 
 Example `workflow.yml`:
 
@@ -88,6 +172,7 @@ runs:
   using: "composite"
   steps: 
     - run: echo hello ${{ inputs.your_name }}
+      shell: bash
 ```
 
 Example Output:
@@ -98,7 +183,7 @@ hello Octocat
 
 Each input variable in the composite action is only viewable in its own scope.
 
-## Outputs
+### Outputs
 
 Example `workflow.yml`:
 
@@ -108,6 +193,7 @@ steps:
   - id: foo
     uses: user/composite@v1
   - run: echo random-number ${{ steps.foo.outputs.random-number }} 
+    shell: bash
 ```
 
 Example `user/composite/action.yml`:
@@ -121,7 +207,8 @@ runs:
   using: "composite"
   steps: 
     - id: random-number-generator
-      run: echo "::set-output name=random-number::$(echo $RANDOM)"
+      run: echo "::set-output name=random-id::$(echo $RANDOM)"
+      shell: bash
 ```
 
 Example Output:
@@ -135,22 +222,26 @@ Each of the output variables from the composite action is viewable from the work
 
 Moreover, the output ids are only accessible within the scope where it was defined. Note that in the example above, in our `workflow.yml` file, it should not have access to output id (i.e. `random-id`). The reason why we are doing this is because we don't want to require the workflow author to know the internal workings of the composite action.
 
-## Context
+### Context
 
 Similar to the workflow file, the composite action has access to the [same context objects](https://help.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions#contexts) (ex: `github`, `env`, `strategy`). 
 
-## Environment
+### Environment
 
 In the Composite Action, you'll only be able to use `::set-env::` to set environment variables just like you could with other actions.
 
-## Secrets
+### Secrets
 
-**Note** : This feature will be focused on in a future ADR.
+**We will not support "Secrets" in a composite action for now. This functionality will be focused on in a future ADR.**
 
 We'll pass the secrets from the composite action's parents (ex: the workflow file) to the composite action. Secrets can be created in the composite action with the secrets context. In the actions yaml, we'll automatically mask the secret. 
 
 
-## If Condition
+### If Condition
+
+** If and needs conditions will not be supported in the composite run steps feature. It will be supported later on in a new feature. **
+
+Old reasoning:
 
 Example `workflow.yml`:
 
@@ -168,24 +259,30 @@ runs:
   using: "composite"
   steps:
     - run: echo "just succeeding"
+      shell: bash
     - run: echo "I will run, as my current scope is succeeding"
+      shell: bash
       if: success()
     - run: exit 1
+      shell: bash
     - run: echo "I will not run, as my current scope is now failing"
+      shell: bash
 ```
 
+**We will not support "if Condition" in a composite action for now. This functionality will be focused on in a future ADR.**
+
 See the paragraph below for a rudimentary approach (thank you to @cybojenix for the idea, example, and explanation for this approach):
 
 The `if` statement in the parent (in the example above, this is the `workflow.yml`) shows whether or not we should run the composite action. So, our composite action will run since the `if` condition for running the composite action is `always()`.
 
-**Note that the if condition on the parent does not propogate to the rest of its children though.**
+**Note that the if condition on the parent does not propagate to the rest of its children though.**
 
 In the child action (in this example, this is the `action.yml`), it starts with a clean slate (in other words, no imposing if conditions). Similar to the logic in the paragraph above, `echo "I will run, as my current scope is succeeding"` will run since the `if` condition checks if the previous steps **within this composite action** has not failed. `run: echo "I will not run, as my current scope is now failing"` will not run since the previous step resulted in an error and by default, the if expression is set to `success()` if the if condition is not set for a step.
 
 
 What if a step has `cancelled()`? We do the opposite of our approach above if `cancelled()` is used for any of our composite run steps. We will cancel any step that has this condition if the workflow is cancelled at all.
     
-## Timeout-minutes
+### Timeout-minutes
 
 Example `workflow.yml`:
 
@@ -205,13 +302,18 @@ runs:
     - id: foo1
       run: echo test 1
       timeout-minutes: 10
+      shell: bash
     - id: foo2
       run: echo test 2
+      shell: bash
     - id: foo3
       run: echo test 3
       timeout-minutes: 10
+      shell: bash
 ```
 
+**We will not support "timeout-minutes" in a composite action for now. This functionality will be focused on in a future ADR.**
+
 A composite action in its entirety is a job. You can set both timeout-minutes for the whole composite action or its steps as long as the the sum of the `timeout-minutes` for each composite action step that has the attribute `timeout-minutes` is less than or equals to `timeout-minutes` for the composite action. There is no default timeout-minutes for each composite action step. 
 
 If the time taken for any of the steps in combination or individually exceed the whole composite action `timeout-minutes` attribute, the whole job will fail (1). If an individual step exceeds its own `timeout-minutes` attribute but the total time that has been used including this step is below the overall composite action `timeout-minutes`, the individual step will fail but the rest of the steps will run based on their own `timeout-minutes` attribute (they will still abide by condition (1) though).
@@ -223,7 +325,7 @@ The rationale behind this is that users can configure their steps with the `if`
 [Usage limits still apply](https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions?query=if%28%29#usage-limits)
 
 
-## Continue-on-error
+### Continue-on-error
 
 Example `workflow.yml`:
 
@@ -245,18 +347,18 @@ runs:
   steps: 
     - run: exit 1
       continue-on-error: true
+      shell: bash
     - run: echo "Hello World 2" <----- This step will run
+      shell: bash
 ```
 
+**We will not support "continue-on-error" in a composite action for now. This functionality will be focused on in a future ADR.**
+
 If any of the steps fail in the composite action and the `continue-on-error` is set to `false` for the whole composite action step in the workflow file, then the steps below it will run. On the flip side, if `continue-on-error` is set to `true` for the whole composite action step in the workflow file, the next job step will run.
 
 For the composite action steps, it follows the same logic as above. In this example, `"Hello World 2"` will be outputted because the previous step has `continue-on-error` set to `true` although that previous step errored. 
 
-## Defaults
-
-The composite action author will be required to set the `shell` and `workingDir` of the composite action. Moreover, the composite action author will be able to explicitly set the shell for each composite run step. The workflow author will not have the ability to change these attributes. 
-
-## Visualizing Composite Action in the GitHub Actions UI
+### Visualizing Composite Action in the GitHub Actions UI
 We want all the composite action's steps to be condensed into the original composite action node. 
 
 Here is a visual represenation of the [first example](#Steps)
@@ -271,5 +373,6 @@ Here is a visual represenation of the [first example](#Steps)
 ```
 
 
-## Conclusion
+## Consequences
+
 This ADR lays the framework for eventually supporting nested Composite Actions within Composite Actions. This ADR allows for users to run multiple run steps within a GitHub Composite Action with the support of inputs, outputs, environment, and context for use in any steps as well as the if, timeout-minutes, and the continue-on-error attributes for each Composite Action step. 

releaseNote.md

@@ -1,18 +1,13 @@
 ## Features
-  - Resolve action download info from server (#508, #515, #550)
-  - Print runner and machine name to log. (#539)
+  - Add in Log line numbers for streaming logs (#663)
+  - Read env file (#683)
+  - Add Runner File Commands (#684, #693)
+
 ## Bugs
-  - Reduce input validation warnings (#506) 
-  - Fix null ref exception in SecretMasker caused by `hashfiles` timeout. (#516)
-  - Add libicu66 to `./installDependencies.sh` for Ubuntu 20.04 (#535)
-  - Fix DataContract with Token service (#532)
-  - Skip search $PATH on command with fully qualified path (#526)
-  - Restore SELinux context on service file when SELinux is enabled (#525)
+  - N/A
+
 ## Misc
-  - Remove SPS/Token migration code. Remove GHES url manipulate code. (#513) 
-  - Add sub-step for developer flow for clarity (#523)
-  - Update Links and Language to Git + VSCode (#522)
-  - Update runner configuration exception message (#540)
+  - N/A
 
 ## Windows x64
 We recommend configuring the runner in a root folder of the Windows drive (e.g. "C:\actions-runner"). This will help avoid issues related to service identity folder permissions and long file path restrictions on Windows.

releaseVersion

@@ -1 +1 @@
-<Update to ./src/runnerversion when creating release>
+2.273.1

src/Misc/dotnet-install.ps1

@@ -69,6 +69,8 @@
 .PARAMETER ProxyUseDefaultCredentials
     Default: false
     Use default credentials, when using proxy address.
+.PARAMETER ProxyBypassList
+    If set with ProxyAddress, will provide the list of comma separated urls that will bypass the proxy
 .PARAMETER SkipNonVersionedFiles
     Default: false
     Skips installing non-versioned files if they already exist, such as dotnet.exe.
@@ -96,6 +98,7 @@ param(
    [string]$FeedCredential,
    [string]$ProxyAddress,
    [switch]$ProxyUseDefaultCredentials,
+   [string[]]$ProxyBypassList=@(),
    [switch]$SkipNonVersionedFiles,
    [switch]$NoCdn
 )
@@ -119,11 +122,27 @@ $VersionRegEx="/\d+\.\d+[^/]+/"
 $OverrideNonVersionedFiles = !$SkipNonVersionedFiles
 
 function Say($str) {
-    Write-Host "dotnet-install: $str"
+    try
+    {
+        Write-Host "dotnet-install: $str"
+    }
+    catch
+    {
+        # Some platforms cannot utilize Write-Host (Azure Functions, for instance). Fall back to Write-Output
+        Write-Output "dotnet-install: $str"
+    }
 }
 
 function Say-Verbose($str) {
-    Write-Verbose "dotnet-install: $str"
+    try
+    {
+        Write-Verbose "dotnet-install: $str"
+    }
+    catch
+    {
+        # Some platforms cannot utilize Write-Verbose (Azure Functions, for instance). Fall back to Write-Output
+        Write-Output "dotnet-install: $str"
+    }
 }
 
 function Say-Invocation($Invocation) {
@@ -237,7 +256,11 @@ function GetHTTPResponse([Uri] $Uri)
 
             if($ProxyAddress) {
                 $HttpClientHandler = New-Object System.Net.Http.HttpClientHandler
-                $HttpClientHandler.Proxy =  New-Object System.Net.WebProxy -Property @{Address=$ProxyAddress;UseDefaultCredentials=$ProxyUseDefaultCredentials}
+                $HttpClientHandler.Proxy =  New-Object System.Net.WebProxy -Property @{
+                    Address=$ProxyAddress;
+                    UseDefaultCredentials=$ProxyUseDefaultCredentials;
+                    BypassList = $ProxyBypassList;
+                }
                 $HttpClient = New-Object System.Net.Http.HttpClient -ArgumentList $HttpClientHandler
             }
             else {
@@ -695,10 +718,10 @@ Say "Installation finished"
 exit 0
 
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+# fgoIxgsI5wogRQF20sCD7x7ZTbpMweqxFCQSGRE8Z2B0FmntXXrEvQtS1ee0PC/1
+# +eD7oAsVwmsSWdQHKfOVBqz51g2S+ImuzTGCAw0wggMJAgEBMIGTMHwxCzAJBgNV
+# BAYTAlVTMRMwEQYDVQQIEwpXYXNoaW5ndG9uMRAwDgYDVQQHEwdSZWRtb25kMR4w
+# HAYDVQQKExVNaWNyb3NvZnQgQ29ycG9yYXRpb24xJjAkBgNVBAMTHU1pY3Jvc29m
+# dCBUaW1lLVN0YW1wIFBDQSAyMDEwAhMzAAABJYvei2xyJjHdAAAAAAElMA0GCWCG
+# SAFlAwQCAQUAoIIBSjAaBgkqhkiG9w0BCQMxDQYLKoZIhvcNAQkQAQQwLwYJKoZI
+# hvcNAQkEMSIEIJICFqJn2Gtkce4xbJqSJCqpNLdz4fjym2OW0Ac8zI+nMIH6Bgsq
+# hkiG9w0BCRACLzGB6jCB5zCB5DCBvQQgXd/Gsi5vMF/6iX2CDh+VfmL5RvqaFkFw
+# luiyje9B9w4wgZgwgYCkfjB8MQswCQYDVQQGEwJVUzETMBEGA1UECBMKV2FzaGlu
+# Z3RvbjEQMA4GA1UEBxMHUmVkbW9uZDEeMBwGA1UEChMVTWljcm9zb2Z0IENvcnBv
+# cmF0aW9uMSYwJAYDVQQDEx1NaWNyb3NvZnQgVGltZS1TdGFtcCBQQ0EgMjAxMAIT
+# MwAAASWL3otsciYx3QAAAAABJTAiBCBSjc2CBOdr7iaTswYVN8f7KwiN5s4uBEO+
+# JVI8WLhgFzANBgkqhkiG9w0BAQsFAASCAQCfsvzXMzAN1kylt4eAKSH4ryFIJqBH
+# O7jcx7iIA9X6OPTuUmBniZGf2fmFG61V4HlmRgGOXuisJdpU3kiC7EZyFX6ZJoIj
+# kgvCQf4BPu/cLtn2w6odZ68OrTHs7BfBKBr6eQKKcZ/kgRSsjMNinh8tHPlrxE63
+# Zha3mUFfsnX5bi+F4VPhluGvRuA7q3IqMzfA/dTxON9WH5L+t3TwW61VebBaSPkT
+# YevYlj0TTlCw1B3zk0ztU37uulqDi4rFr67VaoR3qrhL/xZ/DsaNXg1V/RXqQRrw
+# eCag1OFRASAQOUOlWSi0QtYgUDl5FKKzxaJTEd946+6mJIkNXZB3nmA1
+# SIG # End signature block

src/Misc/expressionFunc/hashFiles/package-lock.json

@@ -1683,9 +1683,9 @@
       }
     },
     "lodash": {
-      "version": "4.17.15",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
-      "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==",
+      "version": "4.17.19",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.19.tgz",
+      "integrity": "sha512-JNvd8XER9GQX0v2qJgsaN/mzFCNA5BRe/j8JN9d+tWyGLSodKQHKFicdwNYzWwI3wjRnaKPsGj1XkBjx/F96DQ==",
       "dev": true
     },
     "lodash.unescape": {

src/Misc/layoutbin/actions.runner.plist.template

@@ -23,5 +23,7 @@
       <key>ACTIONS_RUNNER_SVC</key>
       <string>1</string>
     </dict>
+    <key>ProcessType</key>
+    <string>Interactive</string>
   </dict>
 </plist>

src/Misc/layoutroot/config.sh

@@ -67,7 +67,7 @@ while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symli
   [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE" # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
 done
 DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
-cd $DIR
+cd "$DIR"
 
 source ./env.sh
 

src/Runner.Common/Constants.cs

@@ -90,7 +90,7 @@ namespace GitHub.Runner.Common
                     public static readonly string Labels = "labels";
                     public static readonly string MonitorSocketAddress = "monitorsocketaddress";
                     public static readonly string Name = "name";
-                    public static readonly string Pool = "pool";
+                    public static readonly string RunnerGroup = "runnergroup";
                     public static readonly string StartupType = "startuptype";
                     public static readonly string Url = "url";
                     public static readonly string UserName = "username";

src/Runner.Common/ExtensionManager.cs

@@ -56,6 +56,10 @@ namespace GitHub.Runner.Common
                     Add<T>(extensions, "GitHub.Runner.Worker.EndGroupCommandExtension, Runner.Worker");
                     Add<T>(extensions, "GitHub.Runner.Worker.EchoCommandExtension, Runner.Worker");
                     break;
+                case "GitHub.Runner.Worker.IFileCommandExtension":
+                    Add<T>(extensions, "GitHub.Runner.Worker.AddPathFileCommand, Runner.Worker");
+                    Add<T>(extensions, "GitHub.Runner.Worker.SetEnvFileCommand, Runner.Worker");
+                    break;
                 default:
                     // This should never happen.
                     throw new NotSupportedException($"Unexpected extension type: '{typeof(T).FullName}'");

src/Runner.Common/JobServer.cs

@@ -16,6 +16,7 @@ namespace GitHub.Runner.Common
         // logging and console
         Task<TaskLog> AppendLogContentAsync(Guid scopeIdentifier, string hubName, Guid planId, int logId, Stream uploadStream, CancellationToken cancellationToken);
         Task AppendTimelineRecordFeedAsync(Guid scopeIdentifier, string hubName, Guid planId, Guid timelineId, Guid timelineRecordId, Guid stepId, IList<string> lines, CancellationToken cancellationToken);
+        Task AppendTimelineRecordFeedAsync(Guid scopeIdentifier, string hubName, Guid planId, Guid timelineId, Guid timelineRecordId, Guid stepId, IList<string> lines, long startLine, CancellationToken cancellationToken);
         Task<TaskAttachment> CreateAttachmentAsync(Guid scopeIdentifier, string hubName, Guid planId, Guid timelineId, Guid timelineRecordId, String type, String name, Stream uploadStream, CancellationToken cancellationToken);
         Task<TaskLog> CreateLogAsync(Guid scopeIdentifier, string hubName, Guid planId, TaskLog log, CancellationToken cancellationToken);
         Task<Timeline> CreateTimelineAsync(Guid scopeIdentifier, string hubName, Guid planId, Guid timelineId, CancellationToken cancellationToken);
@@ -79,6 +80,12 @@ namespace GitHub.Runner.Common
             return _taskClient.AppendTimelineRecordFeedAsync(scopeIdentifier, hubName, planId, timelineId, timelineRecordId, stepId, lines, cancellationToken: cancellationToken);
         }
 
+        public Task AppendTimelineRecordFeedAsync(Guid scopeIdentifier, string hubName, Guid planId, Guid timelineId, Guid timelineRecordId, Guid stepId, IList<string> lines, long startLine, CancellationToken cancellationToken)
+        {
+            CheckConnection();
+            return _taskClient.AppendTimelineRecordFeedAsync(scopeIdentifier, hubName, planId, timelineId, timelineRecordId, stepId, lines, startLine, cancellationToken: cancellationToken);
+        }
+
         public Task<TaskAttachment> CreateAttachmentAsync(Guid scopeIdentifier, string hubName, Guid planId, Guid timelineId, Guid timelineRecordId, string type, string name, Stream uploadStream, CancellationToken cancellationToken)
         {
             CheckConnection();

src/Runner.Common/JobServerQueue.cs

@@ -18,7 +18,7 @@ namespace GitHub.Runner.Common
         event EventHandler<ThrottlingEventArgs> JobServerQueueThrottling;
         Task ShutdownAsync();
         void Start(Pipelines.AgentJobRequestMessage jobRequest);
-        void QueueWebConsoleLine(Guid stepRecordId, string line);
+        void QueueWebConsoleLine(Guid stepRecordId, string line, long? lineNumber = null);
         void QueueFileUpload(Guid timelineId, Guid timelineRecordId, string type, string name, string path, bool deleteSource);
         void QueueTimelineRecordUpdate(Guid timelineId, TimelineRecord timelineRecord);
     }
@@ -155,10 +155,10 @@ namespace GitHub.Runner.Common
             Trace.Info("All queue process tasks have been stopped, and all queues are drained.");
         }
 
-        public void QueueWebConsoleLine(Guid stepRecordId, string line)
+        public void QueueWebConsoleLine(Guid stepRecordId, string line, long? lineNumber)
         {
             Trace.Verbose("Enqueue web console line queue: {0}", line);
-            _webConsoleLineQueue.Enqueue(new ConsoleLineInfo(stepRecordId, line));
+            _webConsoleLineQueue.Enqueue(new ConsoleLineInfo(stepRecordId, line, lineNumber));
         }
 
         public void QueueFileUpload(Guid timelineId, Guid timelineRecordId, string type, string name, string path, bool deleteSource)
@@ -214,7 +214,7 @@ namespace GitHub.Runner.Common
                 }
 
                 // Group consolelines by timeline record of each step
-                Dictionary<Guid, List<string>> stepsConsoleLines = new Dictionary<Guid, List<string>>();
+                Dictionary<Guid, List<TimelineRecordLogLine>> stepsConsoleLines = new Dictionary<Guid, List<TimelineRecordLogLine>>();
                 List<Guid> stepRecordIds = new List<Guid>(); // We need to keep lines in order
                 int linesCounter = 0;
                 ConsoleLineInfo lineInfo;
@@ -222,7 +222,7 @@ namespace GitHub.Runner.Common
                 {
                     if (!stepsConsoleLines.ContainsKey(lineInfo.StepRecordId))
                     {
-                        stepsConsoleLines[lineInfo.StepRecordId] = new List<string>();
+                        stepsConsoleLines[lineInfo.StepRecordId] = new List<TimelineRecordLogLine>();
                         stepRecordIds.Add(lineInfo.StepRecordId);
                     }
 
@@ -232,7 +232,7 @@ namespace GitHub.Runner.Common
                         lineInfo.Line = $"{lineInfo.Line.Substring(0, 1024)}...";
                     }
 
-                    stepsConsoleLines[lineInfo.StepRecordId].Add(lineInfo.Line);
+                    stepsConsoleLines[lineInfo.StepRecordId].Add(new TimelineRecordLogLine(lineInfo.Line, lineInfo.LineNumber));
                     linesCounter++;
 
                     // process at most about 500 lines of web console line during regular timer dequeue task.
@@ -247,13 +247,13 @@ namespace GitHub.Runner.Common
                 {
                     // Split consolelines into batch, each batch will container at most 100 lines.
                     int batchCounter = 0;
-                    List<List<string>> batchedLines = new List<List<string>>();
+                    List<List<TimelineRecordLogLine>> batchedLines = new List<List<TimelineRecordLogLine>>();
                     foreach (var line in stepsConsoleLines[stepRecordId])
                     {
                         var currentBatch = batchedLines.ElementAtOrDefault(batchCounter);
                         if (currentBatch == null)
                         {
-                            batchedLines.Add(new List<string>());
+                            batchedLines.Add(new List<TimelineRecordLogLine>());
                             currentBatch = batchedLines.ElementAt(batchCounter);
                         }
 
@@ -275,7 +275,6 @@ namespace GitHub.Runner.Common
                         {
                             Trace.Info($"Skip {batchedLines.Count - 2} batches web console lines for last run");
                             batchedLines = batchedLines.TakeLast(2).ToList();
-                            batchedLines[0].Insert(0, "...");
                         }
 
                         int errorCount = 0;
@@ -284,7 +283,15 @@ namespace GitHub.Runner.Common
                             try
                             {
                                 // we will not requeue failed batch, since the web console lines are time sensitive.
-                                await _jobServer.AppendTimelineRecordFeedAsync(_scopeIdentifier, _hubName, _planId, _jobTimelineId, _jobTimelineRecordId, stepRecordId, batch, default(CancellationToken));
+                                if (batch[0].LineNumber.HasValue)
+                                {
+                                    await _jobServer.AppendTimelineRecordFeedAsync(_scopeIdentifier, _hubName, _planId, _jobTimelineId, _jobTimelineRecordId, stepRecordId, batch.Select(logLine => logLine.Line).ToList(), batch[0].LineNumber.Value, default(CancellationToken));
+                                }
+                                else 
+                                {
+                                    await _jobServer.AppendTimelineRecordFeedAsync(_scopeIdentifier, _hubName, _planId, _jobTimelineId, _jobTimelineRecordId, stepRecordId, batch.Select(logLine => logLine.Line).ToList(), default(CancellationToken));
+                                }
+                                
                                 if (_firstConsoleOutputs)
                                 {
                                     HostContext.WritePerfCounter($"WorkerJobServerQueueAppendFirstConsoleOutput_{_planId.ToString()}");
@@ -653,13 +660,15 @@ namespace GitHub.Runner.Common
 
     internal class ConsoleLineInfo
     {
-        public ConsoleLineInfo(Guid recordId, string line)
+        public ConsoleLineInfo(Guid recordId, string line, long? lineNumber)
         {
             this.StepRecordId = recordId;
             this.Line = line;
+            this.LineNumber = lineNumber;
         }
 
         public Guid StepRecordId { get; set; }
         public string Line { get; set; }
+        public long? LineNumber { get; set; }
     }
 }

src/Runner.Common/Util/EncodingUtil.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using GitHub.Runner.Sdk;
+using GitHub.Runner.Common;
+
+namespace GitHub.Runner.Common.Util
+{
+    public static class EncodingUtil
+    {
+        public static async Task SetEncoding(IHostContext hostContext, Tracing trace, CancellationToken cancellationToken)
+        {
+#if OS_WINDOWS
+            try
+            {
+                if (Console.InputEncoding.CodePage != 65001)
+                {
+                    using (var p = hostContext.CreateService<IProcessInvoker>())
+                    {
+                        // Use UTF8 code page
+                        int exitCode = await p.ExecuteAsync(workingDirectory: hostContext.GetDirectory(WellKnownDirectory.Work),
+                                                fileName: WhichUtil.Which("chcp", true, trace),
+                                                arguments: "65001",
+                                                environment: null,
+                                                requireExitCodeZero: false,
+                                                outputEncoding: null,
+                                                killProcessOnCancel: false,
+                                                redirectStandardIn: null,
+                                                inheritConsoleHandler: true,
+                                                cancellationToken: cancellationToken);
+                        if (exitCode == 0)
+                        {
+                            trace.Info("Successfully returned to code page 65001 (UTF8)");
+                        }
+                        else
+                        {
+                            trace.Warning($"'chcp 65001' failed with exit code {exitCode}");
+                        }
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                trace.Warning($"'chcp 65001' failed with exception {ex.Message}");
+            }
+#endif
+            // Dummy variable to prevent compiler error CS1998: "This async method lacks 'await' operators and will run synchronously..."
+            await Task.CompletedTask;
+        }
+    }
+}

src/Runner.Listener/CommandSettings.cs

@@ -42,7 +42,7 @@ namespace GitHub.Runner.Listener
             Constants.Runner.CommandLine.Args.Labels,
             Constants.Runner.CommandLine.Args.MonitorSocketAddress,
             Constants.Runner.CommandLine.Args.Name,
-            Constants.Runner.CommandLine.Args.Pool,
+            Constants.Runner.CommandLine.Args.RunnerGroup,
             Constants.Runner.CommandLine.Args.StartupType,
             Constants.Runner.CommandLine.Args.Token,
             Constants.Runner.CommandLine.Args.Url,
@@ -169,6 +169,15 @@ namespace GitHub.Runner.Listener
                 validator: Validators.NonEmptyValidator);
         }
 
+        public string GetRunnerGroupName(string defaultPoolName = null)
+        {
+            return GetArgOrPrompt(
+                name: Constants.Runner.CommandLine.Args.RunnerGroup,
+                description: "Enter the name of the runner group to add this runner to:",
+                defaultValue: defaultPoolName ?? "default",
+                validator: Validators.NonEmptyValidator);
+        }
+
         public string GetToken()
         {
             return GetArgOrPrompt(

src/Runner.Listener/Configuration/ConfigurationManager.cs

@@ -159,17 +159,34 @@ namespace GitHub.Runner.Listener.Configuration
 
             _term.WriteSection("Runner Registration");
 
-            //Get all the agent pools, and select the first private pool
+            // If we have more than one runner group available, allow the user to specify which one to be added into
+            string poolName = null;
+            TaskAgentPool agentPool = null;
             List<TaskAgentPool> agentPools = await _runnerServer.GetAgentPoolsAsync();
-            TaskAgentPool agentPool = agentPools?.Where(x => x.IsHosted == false).FirstOrDefault();
+            TaskAgentPool defaultPool = agentPools?.Where(x => x.IsInternal).FirstOrDefault();
 
-            if (agentPool == null)
+            if (agentPools?.Where(x => !x.IsHosted).Count() > 1)
             {
-                throw new TaskAgentPoolNotFoundException($"Could not find any private pool. Contact support.");
+                poolName = command.GetRunnerGroupName(defaultPool?.Name);
+                _term.WriteLine();
+                agentPool = agentPools.Where(x => string.Equals(poolName, x.Name, StringComparison.OrdinalIgnoreCase) && !x.IsHosted).FirstOrDefault();
             }
             else
             {
-                Trace.Info("Found a private pool with id {1} and name {2}", agentPool.Id, agentPool.Name);
+                agentPool = defaultPool;
+            }
+
+            if (agentPool == null && poolName == null)
+            {
+                throw new TaskAgentPoolNotFoundException($"Could not find any self-hosted runner groups. Contact support.");
+            }
+            else if (agentPool == null && poolName != null)
+            {
+                throw new TaskAgentPoolNotFoundException($"Could not find any self-hosted runner group named \"{poolName}\".");
+            }
+            else
+            {
+                Trace.Info("Found a self-hosted runner group with id {1} and name {2}", agentPool.Id, agentPool.Name);
                 runnerSettings.PoolId = agentPool.Id;
                 runnerSettings.PoolName = agentPool.Name;
             }

src/Runner.Listener/Runner.cs

@@ -462,13 +462,14 @@ Options:
  --commit   Prints the runner commit
 
 Config Options:
- --unattended     Disable interactive prompts for missing arguments. Defaults will be used for missing options
- --url string     Repository to add the runner to. Required if unattended
- --token string   Registration token. Required if unattended
- --name string    Name of the runner to configure (default {Environment.MachineName ?? "myrunner"})
- --labels string  Extra labels in addition to the default: 'self-hosted,{Constants.Runner.Platform},{Constants.Runner.PlatformArchitecture}'
- --work string    Relative runner work directory (default {Constants.Path.WorkDirectory})
- --replace        Replace any existing runner with the same name (default false)");
+ --unattended           Disable interactive prompts for missing arguments. Defaults will be used for missing options
+ --url string           Repository to add the runner to. Required if unattended
+ --token string         Registration token. Required if unattended
+ --name string          Name of the runner to configure (default {Environment.MachineName ?? "myrunner"})
+ --runnergroup string   Name of the runner group to add this runner to (defaults to the default runner group)
+ --labels string        Extra labels in addition to the default: 'self-hosted,{Constants.Runner.Platform},{Constants.Runner.PlatformArchitecture}'
+ --work string          Relative runner work directory (default {Constants.Path.WorkDirectory})
+ --replace              Replace any existing runner with the same name (default false)");
 #if OS_WINDOWS
     _term.WriteLine($@" --runasservice   Run the runner as a service");
     _term.WriteLine($@" --windowslogonaccount string   Account to run the service as. Requires runasservice");

src/Runner.Sdk/Util/StringUtil.cs

@@ -30,7 +30,7 @@ namespace GitHub.Runner.Sdk
             //
             // For example, on an en-US box, this is required for loading the encoding for the
             // default console output code page '437'. Without loading the correct encoding for
-            // code page IBM437, some characters cannot be translated correctly, e.g. write 'ç'
+            // code page IBM437, some characters cannot be translated correctly, e.g. write 'ç'
             // from powershell.exe.
             Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
 #endif

src/Runner.Worker/ActionCommandManager.cs

@@ -188,7 +188,7 @@ namespace GitHub.Runner.Worker
                 throw new Exception("Required field 'name' is missing in ##[set-env] command.");
             }
 
-            context.EnvironmentVariables[envName] = command.Data;
+            context.Global.EnvironmentVariables[envName] = command.Data;
             context.SetEnvContext(envName, command.Data);
             context.Debug($"{envName}='{command.Data}'");
         }
@@ -283,8 +283,8 @@ namespace GitHub.Runner.Worker
         public void ProcessCommand(IExecutionContext context, string line, ActionCommand command, ContainerInfo container)
         {
             ArgUtil.NotNullOrEmpty(command.Data, "path");
-            context.PrependPath.RemoveAll(x => string.Equals(x, command.Data, StringComparison.CurrentCulture));
-            context.PrependPath.Add(command.Data);
+            context.Global.PrependPath.RemoveAll(x => string.Equals(x, command.Data, StringComparison.CurrentCulture));
+            context.Global.PrependPath.Add(command.Data);
         }
     }
 

src/Runner.Worker/ActionManager.cs

@@ -66,7 +66,7 @@ namespace GitHub.Runner.Worker
 
             // TODO: Deprecate the PREVIEW_ACTION_TOKEN
             // Log even if we aren't using it to ensure users know.
-            if (!string.IsNullOrEmpty(executionContext.Variables.Get("PREVIEW_ACTION_TOKEN")))
+            if (!string.IsNullOrEmpty(executionContext.Global.Variables.Get("PREVIEW_ACTION_TOKEN")))
             {
                 executionContext.Warning("The 'PREVIEW_ACTION_TOKEN' secret is deprecated. Please remove it from the repository's secrets");
             }
@@ -75,7 +75,7 @@ namespace GitHub.Runner.Worker
             IOUtil.DeleteDirectory(HostContext.GetDirectory(WellKnownDirectory.Actions), executionContext.CancellationToken);
 
             // todo: Remove when feature flag DistributedTask.NewActionMetadata is removed
-            var newActionMetadata = executionContext.Variables.GetBoolean("DistributedTask.NewActionMetadata") ?? false;
+            var newActionMetadata = executionContext.Global.Variables.GetBoolean("DistributedTask.NewActionMetadata") ?? false;
 
             var repositoryActions = new List<Pipelines.ActionStep>();
 
@@ -395,7 +395,7 @@ namespace GitHub.Runner.Worker
                             Trace.Info($"Action cleanup plugin: {plugin.PluginTypeName}.");
                         }
                     }
-                    else if (definition.Data.Execution.ExecutionType == ActionExecutionType.Composite && !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
+                    else if (definition.Data.Execution.ExecutionType == ActionExecutionType.Composite)
                     {
                         var compositeAction = definition.Data.Execution as CompositeActionExecutionData;
                         Trace.Info($"Load {compositeAction.Steps?.Count ?? 0} action steps.");
@@ -468,7 +468,7 @@ namespace GitHub.Runner.Worker
             ArgUtil.NotNull(setupInfo, nameof(setupInfo));
             ArgUtil.NotNullOrEmpty(setupInfo.Container.Image, nameof(setupInfo.Container.Image));
 
-            executionContext.Output($"Pull down action image '{setupInfo.Container.Image}'");
+            executionContext.Output($"##[group]Pull down action image '{setupInfo.Container.Image}'");
 
             // Pull down docker image with retry up to 3 times
             var dockerManger = HostContext.GetService<IDockerCommandManager>();
@@ -492,6 +492,7 @@ namespace GitHub.Runner.Worker
                     }
                 }
             }
+            executionContext.Output("##[endgroup]");
 
             if (retryCount == 3 && pullExitCode != 0)
             {
@@ -511,7 +512,7 @@ namespace GitHub.Runner.Worker
             ArgUtil.NotNull(setupInfo, nameof(setupInfo));
             ArgUtil.NotNullOrEmpty(setupInfo.Container.Dockerfile, nameof(setupInfo.Container.Dockerfile));
 
-            executionContext.Output($"Build container for action use: '{setupInfo.Container.Dockerfile}'.");
+            executionContext.Output($"##[group]Build container for action use: '{setupInfo.Container.Dockerfile}'.");
 
             // Build docker image with retry up to 3 times
             var dockerManger = HostContext.GetService<IDockerCommandManager>();
@@ -541,6 +542,7 @@ namespace GitHub.Runner.Worker
                     }
                 }
             }
+            executionContext.Output("##[endgroup]");
 
             if (retryCount == 3 && buildExitCode != 0)
             {
@@ -589,7 +591,7 @@ namespace GitHub.Runner.Worker
             {
                 try
                 {
-                    actionDownloadInfos = await jobServer.ResolveActionDownloadInfoAsync(executionContext.Plan.ScopeIdentifier, executionContext.Plan.PlanType, executionContext.Plan.PlanId, new WebApi.ActionReferenceList { Actions = actionReferences }, executionContext.CancellationToken);
+                    actionDownloadInfos = await jobServer.ResolveActionDownloadInfoAsync(executionContext.Global.Plan.ScopeIdentifier, executionContext.Global.Plan.PlanType, executionContext.Global.Plan.PlanId, new WebApi.ActionReferenceList { Actions = actionReferences }, executionContext.CancellationToken);
                     break;
                 }
                 catch (Exception ex) when (attempt < 3)
@@ -947,7 +949,7 @@ namespace GitHub.Runner.Worker
             if (string.IsNullOrEmpty(authToken))
             {
                 // TODO: Deprecate the PREVIEW_ACTION_TOKEN
-                authToken = executionContext.Variables.Get("PREVIEW_ACTION_TOKEN");
+                authToken = executionContext.Global.Variables.Get("PREVIEW_ACTION_TOKEN");
             }
 
             if (!string.IsNullOrEmpty(authToken))
@@ -1046,7 +1048,7 @@ namespace GitHub.Runner.Worker
                     Trace.Info($"Action plugin: {(actionDefinitionData.Execution as PluginActionExecutionData).Plugin}, no more preparation.");
                     return null;
                 }
-                else if (actionDefinitionData.Execution.ExecutionType == ActionExecutionType.Composite && !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
+                else if (actionDefinitionData.Execution.ExecutionType == ActionExecutionType.Composite)
                 {
                     Trace.Info($"Action composite: {(actionDefinitionData.Execution as CompositeActionExecutionData).Steps}, no more preparation.");
                     return null;

src/Runner.Worker/ActionManifestManager.cs

@@ -30,8 +30,6 @@ namespace GitHub.Runner.Worker
         Dictionary<string, string> EvaluateContainerEnvironment(IExecutionContext executionContext, MappingToken token, IDictionary<string, PipelineContextData> extraExpressionValues);
 
         string EvaluateDefaultInput(IExecutionContext executionContext, string inputName, TemplateToken token);
-
-        void SetAllCompositeOutputs(IExecutionContext parentExecutionContext, DictionaryContextData actionOutputs);
     }
 
     public sealed class ActionManifestManager : RunnerService, IActionManifestManager
@@ -57,7 +55,7 @@ namespace GitHub.Runner.Worker
 
         public ActionDefinitionData Load(IExecutionContext executionContext, string manifestFile)
         {
-            var templateContext = CreateContext(executionContext);
+            var templateContext = CreateTemplateContext(executionContext);
             ActionDefinitionData actionDefinition = new ActionDefinitionData();
 
             // Clean up file name real quick
@@ -79,9 +77,9 @@ namespace GitHub.Runner.Worker
 
                 // Add this file to the FileTable in executionContext if it hasn't been added already
                 // we use > since fileID is 1 indexed
-                if (fileId > executionContext.FileTable.Count)
+                if (fileId > executionContext.Global.FileTable.Count)
                 {
-                    executionContext.FileTable.Add(fileRelativePath);
+                    executionContext.Global.FileTable.Add(fileRelativePath);
                 }
 
                 // Read the file
@@ -107,12 +105,7 @@ namespace GitHub.Runner.Worker
                             break;
 
                         case "outputs":
-                            if (!string.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
-                            {
-                                actionOutputs = actionPair.Value.AssertMapping("outputs");
-                                break;
-                            }
-                            Trace.Info($"Ignore action property outputs. Outputs for a whole action is not supported yet.");
+                            actionOutputs = actionPair.Value.AssertMapping("outputs");
                             break;
 
                         case "description":
@@ -120,7 +113,7 @@ namespace GitHub.Runner.Worker
                             break;
 
                         case "inputs":
-                            ConvertInputs(templateContext, actionPair.Value, actionDefinition);
+                            ConvertInputs(actionPair.Value, actionDefinition);
                             break;
 
                         case "runs":
@@ -137,7 +130,7 @@ namespace GitHub.Runner.Worker
                 // Evaluate Runs Last
                 if (actionRunValueToken != null)
                 {
-                    actionDefinition.Execution = ConvertRuns(executionContext, templateContext, actionRunValueToken, actionOutputs);
+                    actionDefinition.Execution = ConvertRuns(executionContext, templateContext, actionRunValueToken, fileRelativePath, actionOutputs);
                 }
             }
             catch (Exception ex)
@@ -170,34 +163,6 @@ namespace GitHub.Runner.Worker
             return actionDefinition;
         }
 
-        public void SetAllCompositeOutputs(
-            IExecutionContext parentExecutionContext,
-            DictionaryContextData actionOutputs)
-        {
-            // Each pair is structured like this
-            // We ignore "description" for now
-            // {
-            //   "the-output-name": {
-            //     "description": "",
-            //     "value": "the value"
-            //   },
-            //   ...
-            // }
-            foreach (var pair in actionOutputs)
-            {
-                var outputsName = pair.Key;
-                var outputsAttributes = pair.Value as DictionaryContextData;
-                outputsAttributes.TryGetValue("value", out var val);
-                var outputsValue = val as StringContextData;
-
-                // Set output in the whole composite scope. 
-                if (!String.IsNullOrEmpty(outputsName) && !String.IsNullOrEmpty(outputsValue))
-                {
-                    parentExecutionContext.SetOutput(outputsName, outputsValue, out _);
-                }
-            }
-        }
-
         public DictionaryContextData EvaluateCompositeOutputs(
             IExecutionContext executionContext,
             TemplateToken token,
@@ -207,19 +172,19 @@ namespace GitHub.Runner.Worker
 
             if (token != null)
             {
-                var context = CreateContext(executionContext, extraExpressionValues);
+                var templateContext = CreateTemplateContext(executionContext, extraExpressionValues);
                 try
                 {
-                    token = TemplateEvaluator.Evaluate(context, "outputs", token, 0, null, omitHeader: true);
-                    context.Errors.Check();
+                    token = TemplateEvaluator.Evaluate(templateContext, "outputs", token, 0, null, omitHeader: true);
+                    templateContext.Errors.Check();
                     result = token.ToContextData().AssertDictionary("composite outputs");
                 }
                 catch (Exception ex) when (!(ex is TemplateValidationException))
                 {
-                    context.Errors.Add(ex);
+                    templateContext.Errors.Add(ex);
                 }
 
-                context.Errors.Check();
+                templateContext.Errors.Check();
             }
 
             return result ?? new DictionaryContextData();
@@ -234,11 +199,11 @@ namespace GitHub.Runner.Worker
 
             if (token != null)
             {
-                var context = CreateContext(executionContext, extraExpressionValues);
+                var templateContext = CreateTemplateContext(executionContext, extraExpressionValues);
                 try
                 {
-                    var evaluateResult = TemplateEvaluator.Evaluate(context, "container-runs-args", token, 0, null, omitHeader: true);
-                    context.Errors.Check();
+                    var evaluateResult = TemplateEvaluator.Evaluate(templateContext, "container-runs-args", token, 0, null, omitHeader: true);
+                    templateContext.Errors.Check();
 
                     Trace.Info($"Arguments evaluate result: {StringUtil.ConvertToJson(evaluateResult)}");
 
@@ -255,10 +220,10 @@ namespace GitHub.Runner.Worker
                 catch (Exception ex) when (!(ex is TemplateValidationException))
                 {
                     Trace.Error(ex);
-                    context.Errors.Add(ex);
+                    templateContext.Errors.Add(ex);
                 }
 
-                context.Errors.Check();
+                templateContext.Errors.Check();
             }
 
             return result;
@@ -273,11 +238,11 @@ namespace GitHub.Runner.Worker
 
             if (token != null)
             {
-                var context = CreateContext(executionContext, extraExpressionValues);
+                var templateContext = CreateTemplateContext(executionContext, extraExpressionValues);
                 try
                 {
-                    var evaluateResult = TemplateEvaluator.Evaluate(context, "container-runs-env", token, 0, null, omitHeader: true);
-                    context.Errors.Check();
+                    var evaluateResult = TemplateEvaluator.Evaluate(templateContext, "container-runs-env", token, 0, null, omitHeader: true);
+                    templateContext.Errors.Check();
 
                     Trace.Info($"Environments evaluate result: {StringUtil.ConvertToJson(evaluateResult)}");
 
@@ -299,10 +264,10 @@ namespace GitHub.Runner.Worker
                 catch (Exception ex) when (!(ex is TemplateValidationException))
                 {
                     Trace.Error(ex);
-                    context.Errors.Add(ex);
+                    templateContext.Errors.Add(ex);
                 }
 
-                context.Errors.Check();
+                templateContext.Errors.Check();
             }
 
             return result;
@@ -316,11 +281,11 @@ namespace GitHub.Runner.Worker
             string result = "";
             if (token != null)
             {
-                var context = CreateContext(executionContext);
+                var templateContext = CreateTemplateContext(executionContext);
                 try
                 {
-                    var evaluateResult = TemplateEvaluator.Evaluate(context, "input-default-context", token, 0, null, omitHeader: true);
-                    context.Errors.Check();
+                    var evaluateResult = TemplateEvaluator.Evaluate(templateContext, "input-default-context", token, 0, null, omitHeader: true);
+                    templateContext.Errors.Check();
 
                     Trace.Info($"Input '{inputName}': default value evaluate result: {StringUtil.ConvertToJson(evaluateResult)}");
 
@@ -330,16 +295,16 @@ namespace GitHub.Runner.Worker
                 catch (Exception ex) when (!(ex is TemplateValidationException))
                 {
                     Trace.Error(ex);
-                    context.Errors.Add(ex);
+                    templateContext.Errors.Add(ex);
                 }
 
-                context.Errors.Check();
+                templateContext.Errors.Check();
             }
 
             return result;
         }
 
-        private TemplateContext CreateContext(
+        private TemplateContext CreateTemplateContext(
             IExecutionContext executionContext,
             IDictionary<string, PipelineContextData> extraExpressionValues = null)
         {
@@ -377,9 +342,9 @@ namespace GitHub.Runner.Worker
             }
 
             // Add the file table from the Execution Context
-            for (var i = 0; i < executionContext.FileTable.Count; i++)
+            for (var i = 0; i < executionContext.Global.FileTable.Count; i++)
             {
-                result.GetFileId(executionContext.FileTable[i]);
+                result.GetFileId(executionContext.Global.FileTable[i]);
             }
 
             return result;
@@ -387,8 +352,9 @@ namespace GitHub.Runner.Worker
 
         private ActionExecutionData ConvertRuns(
             IExecutionContext executionContext,
-            TemplateContext context,
+            TemplateContext templateContext,
             TemplateToken inputsToken,
+            String fileRelativePath,
             MappingToken outputs = null)
         {
             var runsMapping = inputsToken.AssertMapping("runs");
@@ -405,7 +371,7 @@ namespace GitHub.Runner.Worker
             var postToken = default(StringToken);
             var postEntrypointToken = default(StringToken);
             var postIfToken = default(StringToken);
-            var stepsLoaded = default(List<Pipelines.ActionStep>);
+            var steps = default(List<Pipelines.Step>);
 
             foreach (var run in runsMapping)
             {
@@ -452,14 +418,10 @@ namespace GitHub.Runner.Worker
                         preIfToken = run.Value.AssertString("pre-if");
                         break;
                     case "steps":
-                        if (!string.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
-                        {
-                            var steps = run.Value.AssertSequence("steps");
-                            var evaluator = executionContext.ToPipelineTemplateEvaluator();
-                            stepsLoaded = evaluator.LoadCompositeSteps(steps);
-                            break;
-                        }
-                        throw new Exception("You aren't supposed to be using Composite Actions yet!");
+                        var stepsToken = run.Value.AssertSequence("steps");
+                        steps = PipelineTemplateConverter.ConvertToSteps(templateContext, stepsToken);
+                        templateContext.Errors.Check();
+                        break;
                     default:
                         Trace.Info($"Ignore run property {runsKey}.");
                         break;
@@ -472,7 +434,7 @@ namespace GitHub.Runner.Worker
                 {
                     if (string.IsNullOrEmpty(imageToken?.Value))
                     {
-                        throw new ArgumentNullException($"Image is not provided.");
+                        throw new ArgumentNullException($"You are using a Container Action but an image is not provided in {fileRelativePath}.");
                     }
                     else
                     {
@@ -493,7 +455,7 @@ namespace GitHub.Runner.Worker
                 {
                     if (string.IsNullOrEmpty(mainToken?.Value))
                     {
-                        throw new ArgumentNullException($"Entry javascript file is not provided.");
+                        throw new ArgumentNullException($"You are using a JavaScript Action but there is not an entry JavaScript file provided in {fileRelativePath}.");
                     }
                     else
                     {
@@ -507,18 +469,17 @@ namespace GitHub.Runner.Worker
                         };
                     }
                 }
-                else if (string.Equals(usingToken.Value, "composite", StringComparison.OrdinalIgnoreCase) && !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("TESTING_COMPOSITE_ACTIONS_ALPHA")))
+                else if (string.Equals(usingToken.Value, "composite", StringComparison.OrdinalIgnoreCase))
                 {
-                    if (stepsLoaded == null)
+                    if (steps == null)
                     {
-                        // TODO: Add a more helpful error message + including file name, etc. to show user that it's because of their yaml file
-                        throw new ArgumentNullException($"No steps provided.");
+                        throw new ArgumentNullException($"You are using a composite action but there are no steps provided in {fileRelativePath}.");
                     }
                     else
                     {
                         return new CompositeActionExecutionData()
                         {
-                            Steps = stepsLoaded,
+                            Steps = steps.Cast<Pipelines.ActionStep>().ToList(),
                             Outputs = outputs
                         };
                     }
@@ -540,7 +501,6 @@ namespace GitHub.Runner.Worker
         }
 
         private void ConvertInputs(
-            TemplateContext context,
             TemplateToken inputsToken,
             ActionDefinitionData actionDefinition)
         {

src/Runner.Worker/ActionRunner.cs

@@ -136,15 +136,19 @@ namespace GitHub.Runner.Worker
             }
 
             // Setup container stephost for running inside the container.
-            if (ExecutionContext.Container != null)
+            if (ExecutionContext.Global.Container != null)
             {
                 // Make sure required container is already created.
-                ArgUtil.NotNullOrEmpty(ExecutionContext.Container.ContainerId, nameof(ExecutionContext.Container.ContainerId));
+                ArgUtil.NotNullOrEmpty(ExecutionContext.Global.Container.ContainerId, nameof(ExecutionContext.Global.Container.ContainerId));
                 var containerStepHost = HostContext.CreateService<IContainerStepHost>();
-                containerStepHost.Container = ExecutionContext.Container;
+                containerStepHost.Container = ExecutionContext.Global.Container;
                 stepHost = containerStepHost;
             }
 
+            // Setup File Command Manager
+            var fileCommandManager = HostContext.CreateService<IFileCommandManager>();
+            fileCommandManager.InitializeFiles(ExecutionContext, null);
+
             // Load the inputs.
             ExecutionContext.Debug("Loading inputs");
             var templateEvaluator = ExecutionContext.ToPipelineTemplateEvaluator();
@@ -231,14 +235,22 @@ namespace GitHub.Runner.Worker
                             handlerData,
                             inputs,
                             environment,
-                            ExecutionContext.Variables,
+                            ExecutionContext.Global.Variables,
                             actionDirectory: definition.Directory);
 
             // Print out action details
             handler.PrintActionDetails(Stage);
 
             // Run the task.
-            await handler.RunAsync(Stage);
+            try 
+            {
+                await handler.RunAsync(Stage);
+            }
+            finally 
+            {
+                fileCommandManager.ProcessFiles(ExecutionContext, ExecutionContext.Global.Container);
+            }
+
         }
 
         public bool TryEvaluateDisplayName(DictionaryContextData contextData, IExecutionContext context)

src/Runner.Worker/ContainerOperationProvider.cs

@@ -91,7 +91,10 @@ namespace GitHub.Runner.Worker
 #endif
 
             // Check docker client/server version
+            executionContext.Output("##[group]Checking docker version");
             DockerVersion dockerVersion = await _dockerManger.DockerVersion(executionContext);
+            executionContext.Output("##[endgroup]");
+
             ArgUtil.NotNull(dockerVersion.ServerVersion, nameof(dockerVersion.ServerVersion));
             ArgUtil.NotNull(dockerVersion.ClientVersion, nameof(dockerVersion.ClientVersion));
 
@@ -111,7 +114,7 @@ namespace GitHub.Runner.Worker
             }
 
             // Clean up containers left by previous runs
-            executionContext.Debug($"Delete stale containers from previous jobs");
+            executionContext.Output("##[group]Clean up resources from previous jobs");
             var staleContainers = await _dockerManger.DockerPS(executionContext, $"--all --quiet --no-trunc --filter \"label={_dockerManger.DockerInstanceLabel}\"");
             foreach (var staleContainer in staleContainers)
             {
@@ -122,18 +125,20 @@ namespace GitHub.Runner.Worker
                 }
             }
 
-            executionContext.Debug($"Delete stale container networks from previous jobs");
             int networkPruneExitCode = await _dockerManger.DockerNetworkPrune(executionContext);
             if (networkPruneExitCode != 0)
             {
                 executionContext.Warning($"Delete stale container networks failed, docker network prune fail with exit code {networkPruneExitCode}");
             }
+            executionContext.Output("##[endgroup]");
 
             // Create local docker network for this job to avoid port conflict when multiple runners run on same machine.
             // All containers within a job join the same network
+            executionContext.Output("##[group]Create local container network");
             var containerNetwork = $"github_network_{Guid.NewGuid().ToString("N")}";
             await CreateContainerNetworkAsync(executionContext, containerNetwork);
             executionContext.JobContext.Container["network"] = new StringContextData(containerNetwork);
+            executionContext.Output("##[endgroup]");
 
             foreach (var container in containers)
             {
@@ -141,10 +146,12 @@ namespace GitHub.Runner.Worker
                 await StartContainerAsync(executionContext, container);
             }
 
+            executionContext.Output("##[group]Waiting for all services to be ready");
             foreach (var container in containers.Where(c => !c.IsJobContainer))
             {
                 await ContainerHealthcheck(executionContext, container);
             }
+            executionContext.Output("##[endgroup]");
         }
 
         public async Task StopContainersAsync(IExecutionContext executionContext, object data)
@@ -173,6 +180,10 @@ namespace GitHub.Runner.Worker
             Trace.Info($"Container name: {container.ContainerName}");
             Trace.Info($"Container image: {container.ContainerImage}");
             Trace.Info($"Container options: {container.ContainerCreateOptions}");
+
+            var groupName = container.IsJobContainer ? "Starting job container" : $"Starting {container.ContainerNetworkAlias} service container";
+            executionContext.Output($"##[group]{groupName}");
+
             foreach (var port in container.UserPortMappings)
             {
                 Trace.Info($"User provided port: {port.Value}");
@@ -304,6 +315,7 @@ namespace GitHub.Runner.Worker
                 container.ContainerRuntimePath = DockerUtil.ParsePathFromConfigEnv(containerEnv);
                 executionContext.JobContext.Container["id"] = new StringContextData(container.ContainerId);
             }
+            executionContext.Output("##[endgroup]");
         }
 
         private async Task StopContainerAsync(IExecutionContext executionContext, ContainerInfo container)

src/Runner.Worker/DiagnosticLogManager.cs

@@ -86,9 +86,9 @@ namespace GitHub.Runner.Worker
 
             executionContext.Debug("Zipping diagnostic files.");
 
-            string buildNumber = executionContext.Variables.Build_Number ?? "UnknownBuildNumber";
+            string buildNumber = executionContext.Global.Variables.Build_Number ?? "UnknownBuildNumber";
             string buildName = $"Build {buildNumber}";
-            string phaseName = executionContext.Variables.System_PhaseDisplayName ?? "UnknownPhaseName";
+            string phaseName = executionContext.Global.Variables.System_PhaseDisplayName ?? "UnknownPhaseName";
 
             // zip the files
             string diagnosticsZipFileName = $"{buildName}-{phaseName}.zip";

src/Runner.Worker/ExecutionContext.cs

@@ -44,41 +44,32 @@ namespace GitHub.Runner.Worker
         string ResultCode { get; set; }
         TaskResult? CommandResult { get; set; }
         CancellationToken CancellationToken { get; }
-        List<ServiceEndpoint> Endpoints { get; }
-        TaskOrchestrationPlanReference Plan { get; }
+        GlobalContext Global { get; }
 
-        PlanFeatures Features { get; }
-        Variables Variables { get; }
         Dictionary<string, string> IntraActionState { get; }
-        IDictionary<String, IDictionary<String, String>> JobDefaults { get; }
         Dictionary<string, VariableValue> JobOutputs { get; }
-        IDictionary<String, String> EnvironmentVariables { get; }
-        IList<String> FileTable { get; }
-        StepsContext StepsContext { get; }
         DictionaryContextData ExpressionValues { get; }
         IList<IFunctionInfo> ExpressionFunctions { get; }
-        List<string> PrependPath { get; }
-        ContainerInfo Container { get; set; }
-        List<ContainerInfo> ServiceContainers { get; }
         JobContext JobContext { get; }
 
         // Only job level ExecutionContext has JobSteps
-        List<IStep> JobSteps { get; }
+        Queue<IStep> JobSteps { get; }
 
         // Only job level ExecutionContext has PostJobSteps
         Stack<IStep> PostJobSteps { get; }
 
         bool EchoOnActionCommand { get; set; }
 
-        IExecutionContext FinalizeContext { get; set; }
+        bool InsideComposite { get; }
+
+        ExecutionContext Root { get; }
 
         // Initialize
         void InitializeJob(Pipelines.AgentJobRequestMessage message, CancellationToken token);
         void CancelToken();
-        IExecutionContext CreateChild(Guid recordId, string displayName, string refName, string scopeName, string contextName, Dictionary<string, string> intraActionState = null, int? recordOrder = null, IPagingLogger logger = null);
+        IExecutionContext CreateChild(Guid recordId, string displayName, string refName, string scopeName, string contextName, Dictionary<string, string> intraActionState = null, int? recordOrder = null, IPagingLogger logger = null, bool insideComposite = false, CancellationTokenSource cancellationTokenSource = null);
 
         // logging
-        bool WriteDebug { get; }
         long Write(string tag, string message);
         void QueueAttachFile(string type, string name, string filePath);
 
@@ -107,7 +98,7 @@ namespace GitHub.Runner.Worker
         // others
         void ForceTaskComplete();
         void RegisterPostJobStep(IStep step);
-        IStep RegisterNestedStep(IActionRunner step, DictionaryContextData inputsData, int location, Dictionary<string, string> envData, bool cleanUp = false);
+        IStep CreateCompositeStep(string scopeName, IActionRunner step, DictionaryContextData inputsData, Dictionary<string, string> envData);
     }
 
     public sealed class ExecutionContext : RunnerService, IExecutionContext
@@ -122,9 +113,6 @@ namespace GitHub.Runner.Worker
 
         private event OnMatcherChanged _onMatcherChanged;
 
-        // Regex used for checking if ScopeName meets the condition that shows that its id is null.
-        private readonly static Regex _generatedContextNamePattern = new Regex("^__[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$", RegexOptions.Compiled | RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
-
         private IssueMatcherConfig[] _matchers;
 
         private IPagingLogger _logger;
@@ -147,24 +135,16 @@ namespace GitHub.Runner.Worker
         public string ContextName { get; private set; }
         public Task ForceCompleted => _forceCompleted.Task;
         public CancellationToken CancellationToken => _cancellationTokenSource.Token;
-        public List<ServiceEndpoint> Endpoints { get; private set; }
-        public TaskOrchestrationPlanReference Plan { get; private set; }
-        public Variables Variables { get; private set; }
         public Dictionary<string, string> IntraActionState { get; private set; }
-        public IDictionary<String, IDictionary<String, String>> JobDefaults { get; private set; }
         public Dictionary<string, VariableValue> JobOutputs { get; private set; }
-        public IDictionary<String, String> EnvironmentVariables { get; private set; }
-        public IList<String> FileTable { get; private set; }
-        public StepsContext StepsContext { get; private set; }
         public DictionaryContextData ExpressionValues { get; } = new DictionaryContextData();
         public IList<IFunctionInfo> ExpressionFunctions { get; } = new List<IFunctionInfo>();
-        public bool WriteDebug { get; private set; }
-        public List<string> PrependPath { get; private set; }
-        public ContainerInfo Container { get; set; }
-        public List<ContainerInfo> ServiceContainers { get; private set; }
+
+        // Shared pointer across job-level execution context and step-level execution contexts
+        public GlobalContext Global { get; private set; }
 
         // Only job level ExecutionContext has JobSteps
-        public List<IStep> JobSteps { get; private set; }
+        public Queue<IStep> JobSteps { get; private set; }
 
         // Only job level ExecutionContext has PostJobSteps
         public Stack<IStep> PostJobSteps { get; private set; }
@@ -174,7 +154,7 @@ namespace GitHub.Runner.Worker
 
         public bool EchoOnActionCommand { get; set; }
 
-        public IExecutionContext FinalizeContext { get; set; }
+        public bool InsideComposite { get; private set; }
 
         public TaskResult? Result
         {
@@ -206,9 +186,7 @@ namespace GitHub.Runner.Worker
             }
         }
 
-        public PlanFeatures Features { get; private set; }
-
-        private ExecutionContext Root
+        public ExecutionContext Root
         {
             get
             {
@@ -276,32 +254,15 @@ namespace GitHub.Runner.Worker
         /// Helper function used in CompositeActionHandler::RunAsync to
         /// add a child node, aka a step, to the current job to the Root.JobSteps based on the location. 
         /// </summary>
-        public IStep RegisterNestedStep(
+        public IStep CreateCompositeStep(
+            string scopeName,
             IActionRunner step,
             DictionaryContextData inputsData,
-            int location,
-            Dictionary<string, string> envData,
-            bool cleanUp = false)
+            Dictionary<string, string> envData)
         {
-            // If the context name is empty and the scope name is empty, we would generate a unique scope name for this child in the following format:
-            // "__<GUID>"
-            var safeContextName = !string.IsNullOrEmpty(ContextName) ? ContextName : $"__{Guid.NewGuid()}";
-
-            // Set Scope Name. Note, for our design, we consider each step in a composite action to have the same scope
-            // This makes it much simpler to handle their outputs at the end of the Composite Action
-            var childScopeName = !string.IsNullOrEmpty(ScopeName) ? $"{ScopeName}.{safeContextName}" : safeContextName;
-
-            var childContextName = !string.IsNullOrEmpty(step.Action.ContextName) ? step.Action.ContextName : $"__{Guid.NewGuid()}";
-
-            step.ExecutionContext = Root.CreateChild(_record.Id, step.DisplayName, _record.Id.ToString("N"), childScopeName, childContextName, logger: _logger);
-
+            step.ExecutionContext = Root.CreateChild(_record.Id, _record.Name, _record.Id.ToString("N"), scopeName, step.Action.ContextName, logger: _logger, insideComposite: true, cancellationTokenSource: CancellationTokenSource.CreateLinkedTokenSource(_cancellationTokenSource.Token));
             step.ExecutionContext.ExpressionValues["inputs"] = inputsData;
-
-            // Set Parent Attribute for Clean Up Step
-            if (cleanUp)
-            {
-                step.ExecutionContext.FinalizeContext = this;
-            }
+            step.ExecutionContext.ExpressionValues["steps"] = Global.StepsContext.GetScope(step.ExecutionContext.GetFullyQualifiedContextName());
 
             // Add the composite action environment variables to each step.
 #if OS_WINDOWS
@@ -315,23 +276,18 @@ namespace GitHub.Runner.Worker
             }
             step.ExecutionContext.ExpressionValues["env"] = envContext;
 
-            Root.JobSteps.Insert(location, step);
-
             return step;
         }
 
-        public IExecutionContext CreateChild(Guid recordId, string displayName, string refName, string scopeName, string contextName, Dictionary<string, string> intraActionState = null, int? recordOrder = null, IPagingLogger logger = null)
+        public IExecutionContext CreateChild(Guid recordId, string displayName, string refName, string scopeName, string contextName, Dictionary<string, string> intraActionState = null, int? recordOrder = null, IPagingLogger logger = null, bool insideComposite = false, CancellationTokenSource cancellationTokenSource = null)
         {
             Trace.Entering();
 
             var child = new ExecutionContext();
             child.Initialize(HostContext);
+            child.Global = Global;
             child.ScopeName = scopeName;
             child.ContextName = contextName;
-            child.Features = Features;
-            child.Variables = Variables;
-            child.Endpoints = Endpoints;
-            child.Plan = Plan;
             if (intraActionState == null)
             {
                 child.IntraActionState = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
@@ -340,10 +296,6 @@ namespace GitHub.Runner.Worker
             {
                 child.IntraActionState = intraActionState;
             }
-            child.EnvironmentVariables = EnvironmentVariables;
-            child.JobDefaults = JobDefaults;
-            child.FileTable = FileTable;
-            child.StepsContext = StepsContext;
             foreach (var pair in ExpressionValues)
             {
                 child.ExpressionValues[pair.Key] = pair.Value;
@@ -352,12 +304,8 @@ namespace GitHub.Runner.Worker
             {
                 child.ExpressionFunctions.Add(item);
             }
-            child._cancellationTokenSource = new CancellationTokenSource();
-            child.WriteDebug = WriteDebug;
+            child._cancellationTokenSource = cancellationTokenSource ?? new CancellationTokenSource();
             child._parentExecutionContext = this;
-            child.PrependPath = PrependPath;
-            child.Container = Container;
-            child.ServiceContainers = ServiceContainers;
             child.EchoOnActionCommand = EchoOnActionCommand;
 
             if (recordOrder != null)
@@ -378,6 +326,8 @@ namespace GitHub.Runner.Worker
                 child._logger.Setup(_mainTimelineId, recordId);
             }
 
+            child.InsideComposite = insideComposite;
+
             return child;
         }
 
@@ -434,10 +384,11 @@ namespace GitHub.Runner.Worker
 
             _logger.End();
 
-            if (!string.IsNullOrEmpty(ContextName))
+            // Skip if generated context name. Generated context names start with "__". After M271-ish the server will never send an empty context name.
+            if (!string.IsNullOrEmpty(ContextName) && !ContextName.StartsWith("__", StringComparison.Ordinal))
             {
-                StepsContext.SetOutcome(ScopeName, ContextName, (Outcome ?? Result ?? TaskResult.Succeeded).ToActionResult());
-                StepsContext.SetConclusion(ScopeName, ContextName, (Result ?? TaskResult.Succeeded).ToActionResult());
+                Global.StepsContext.SetOutcome(ScopeName, ContextName, (Outcome ?? Result ?? TaskResult.Succeeded).ToActionResult());
+                Global.StepsContext.SetConclusion(ScopeName, ContextName, (Result ?? TaskResult.Succeeded).ToActionResult());
             }
 
             return Result.Value;
@@ -496,8 +447,8 @@ namespace GitHub.Runner.Worker
         {
             ArgUtil.NotNullOrEmpty(name, nameof(name));
 
-            // if the ContextName follows the __GUID format which is set as the default value for ContextName if null for Composite Actions. 
-            if (String.IsNullOrEmpty(ContextName) || _generatedContextNamePattern.IsMatch(ContextName))
+            // Skip if generated context name. Generated context names start with "__". After M271-ish the server will never send an empty context name.
+            if (string.IsNullOrEmpty(ContextName) || ContextName.StartsWith("__", StringComparison.Ordinal))
             {
                 reference = null;
                 return;
@@ -505,7 +456,7 @@ namespace GitHub.Runner.Worker
 
             // todo: restrict multiline?
 
-            StepsContext.SetOutput(ScopeName, ContextName, name, value, out reference);
+            Global.StepsContext.SetOutput(ScopeName, ContextName, name, value, out reference);
         }
 
         public void SetTimeout(TimeSpan? timeout)
@@ -639,33 +590,35 @@ namespace GitHub.Runner.Worker
 
             _cancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(token);
 
+            Global = new GlobalContext();
+
             // Plan
-            Plan = message.Plan;
-            Features = PlanUtil.GetFeatures(message.Plan);
+            Global.Plan = message.Plan;
+            Global.Features = PlanUtil.GetFeatures(message.Plan);
 
             // Endpoints
-            Endpoints = message.Resources.Endpoints;
+            Global.Endpoints = message.Resources.Endpoints;
 
             // Variables
-            Variables = new Variables(HostContext, message.Variables);
+            Global.Variables = new Variables(HostContext, message.Variables);
 
             // Environment variables shared across all actions
-            EnvironmentVariables = new Dictionary<string, string>(VarUtil.EnvironmentVariableKeyComparer);
+            Global.EnvironmentVariables = new Dictionary<string, string>(VarUtil.EnvironmentVariableKeyComparer);
 
             // Job defaults shared across all actions
-            JobDefaults = new Dictionary<string, IDictionary<string, string>>(StringComparer.OrdinalIgnoreCase);
+            Global.JobDefaults = new Dictionary<string, IDictionary<string, string>>(StringComparer.OrdinalIgnoreCase);
 
             // Job Outputs
             JobOutputs = new Dictionary<string, VariableValue>(StringComparer.OrdinalIgnoreCase);
 
             // Service container info
-            ServiceContainers = new List<ContainerInfo>();
+            Global.ServiceContainers = new List<ContainerInfo>();
 
             // Steps context (StepsRunner manages adding the scoped steps context)
-            StepsContext = new StepsContext();
+            Global.StepsContext = new StepsContext();
 
             // File table
-            FileTable = new List<String>(message.FileTable ?? new string[0]);
+            Global.FileTable = new List<String>(message.FileTable ?? new string[0]);
 
             // Expression values
             if (message.ContextData?.Count > 0)
@@ -676,15 +629,15 @@ namespace GitHub.Runner.Worker
                 }
             }
 
-            ExpressionValues["secrets"] = Variables.ToSecretsContext();
+            ExpressionValues["secrets"] = Global.Variables.ToSecretsContext();
             ExpressionValues["runner"] = new RunnerContext();
             ExpressionValues["job"] = new JobContext();
 
             Trace.Info("Initialize GitHub context");
-            var githubAccessToken = new StringContextData(Variables.Get("system.github.token"));
+            var githubAccessToken = new StringContextData(Global.Variables.Get("system.github.token"));
             var base64EncodedToken = Convert.ToBase64String(Encoding.UTF8.GetBytes($"x-access-token:{githubAccessToken}"));
             HostContext.SecretMasker.AddValue(base64EncodedToken);
-            var githubJob = Variables.Get("system.github.job");
+            var githubJob = Global.Variables.Get("system.github.job");
             var githubContext = new GitHubContext();
             githubContext["token"] = githubAccessToken;
             if (!string.IsNullOrEmpty(githubJob))
@@ -707,10 +660,10 @@ namespace GitHub.Runner.Worker
 #endif
 
             // Prepend Path
-            PrependPath = new List<string>();
+            Global.PrependPath = new List<string>();
 
             // JobSteps for job ExecutionContext
-            JobSteps = new List<IStep>();
+            JobSteps = new Queue<IStep>();
 
             // PostJobSteps for job ExecutionContext
             PostJobSteps = new Stack<IStep>();
@@ -733,10 +686,10 @@ namespace GitHub.Runner.Worker
             _logger.Setup(_mainTimelineId, _record.Id);
 
             // Initialize 'echo on action command success' property, default to false, unless Step_Debug is set
-            EchoOnActionCommand = Variables.Step_Debug ?? false;
+            EchoOnActionCommand = Global.Variables.Step_Debug ?? false;
 
             // Verbosity (from GitHub.Step_Debug).
-            WriteDebug = Variables.Step_Debug ?? false;
+            Global.WriteDebug = Global.Variables.Step_Debug ?? false;
 
             // Hook up JobServerQueueThrottling event, we will log warning on server tarpit.
             _jobServerQueue.JobServerQueueThrottling += JobServerQueueThrottling_EventReceived;
@@ -764,7 +717,8 @@ namespace GitHub.Runner.Worker
                 }
             }
 
-            _jobServerQueue.QueueWebConsoleLine(_record.Id, msg);
+            _jobServerQueue.QueueWebConsoleLine(_record.Id, msg, totalLines);
+            
             return totalLines;
         }
 
@@ -937,6 +891,16 @@ namespace GitHub.Runner.Worker
     // Otherwise individual overloads would need to be implemented (depending on the unit test).
     public static class ExecutionContextExtension
     {
+        public static string GetFullyQualifiedContextName(this IExecutionContext context)
+        {
+            if (!string.IsNullOrEmpty(context.ScopeName))
+            {
+                return $"{context.ScopeName}.{context.ContextName}";
+            }
+
+            return context.ContextName;
+        }
+
         public static void Error(this IExecutionContext context, Exception ex)
         {
             context.Error(ex.Message);
@@ -975,7 +939,7 @@ namespace GitHub.Runner.Worker
         // Do not add a format string overload. See comment on ExecutionContext.Write().
         public static void Debug(this IExecutionContext context, string message)
         {
-            if (context.WriteDebug)
+            if (context.Global.WriteDebug)
             {
                 var multilines = message?.Replace("\r\n", "\n")?.Split("\n");
                 if (multilines != null)
@@ -1000,7 +964,7 @@ namespace GitHub.Runner.Worker
                 traceWriter = context.ToTemplateTraceWriter();
             }
             var schema = PipelineTemplateSchemaFactory.GetSchema();
-            return new PipelineTemplateEvaluator(traceWriter, schema, context.FileTable);
+            return new PipelineTemplateEvaluator(traceWriter, schema, context.Global.FileTable);
         }
 
         public static ObjectTemplating.ITraceWriter ToTemplateTraceWriter(this IExecutionContext context)

src/Runner.Worker/FileCommandManager.cs

@@ -0,0 +1,262 @@
+using GitHub.DistributedTask.WebApi;
+using GitHub.Runner.Worker.Container;
+using GitHub.Runner.Common;
+using GitHub.Runner.Sdk;
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+
+namespace GitHub.Runner.Worker
+{
+    [ServiceLocator(Default = typeof(FileCommandManager))]
+    public interface IFileCommandManager : IRunnerService
+    {
+        void InitializeFiles(IExecutionContext context, ContainerInfo container);
+        void ProcessFiles(IExecutionContext context, ContainerInfo container);
+    
+    }
+
+    public sealed class FileCommandManager : RunnerService, IFileCommandManager
+    {
+        private const string _folderName = "_runner_file_commands";
+        private List<IFileCommandExtension> _commandExtensions;
+        private string _fileSuffix = String.Empty;
+        private string _fileCommandDirectory;
+        private Tracing _trace;
+
+        public override void Initialize(IHostContext hostContext)
+        {
+            base.Initialize(hostContext);
+            _trace = HostContext.GetTrace(nameof(FileCommandManager));
+
+            _fileCommandDirectory = Path.Combine(HostContext.GetDirectory(WellKnownDirectory.Temp), _folderName);
+            if (!Directory.Exists(_fileCommandDirectory))
+            {
+                Directory.CreateDirectory(_fileCommandDirectory);
+            }
+
+            var extensionManager = hostContext.GetService<IExtensionManager>();
+            _commandExtensions = extensionManager.GetExtensions<IFileCommandExtension>() ?? new List<IFileCommandExtension>();
+        }
+
+        public void InitializeFiles(IExecutionContext context, ContainerInfo container)
+        {
+            var oldSuffix = _fileSuffix;
+            _fileSuffix = Guid.NewGuid().ToString();
+            foreach (var fileCommand in _commandExtensions)
+            {
+                var oldPath = Path.Combine(_fileCommandDirectory, fileCommand.FilePrefix + oldSuffix);
+                if (oldSuffix != String.Empty && File.Exists(oldPath))
+                {
+                    TryDeleteFile(oldPath);
+                }
+
+                var newPath = Path.Combine(_fileCommandDirectory, fileCommand.FilePrefix + _fileSuffix);
+                TryDeleteFile(newPath);
+                File.Create(newPath).Dispose();
+
+                var pathToSet = container != null ? container.TranslateToContainerPath(newPath) : newPath; 
+                context.SetGitHubContext(fileCommand.ContextName, pathToSet);
+            }
+        }
+
+        public void ProcessFiles(IExecutionContext context, ContainerInfo container)
+        {
+            foreach (var fileCommand in _commandExtensions)
+            {
+                try 
+                {
+                    fileCommand.ProcessCommand(context, Path.Combine(_fileCommandDirectory, fileCommand.FilePrefix + _fileSuffix),container);
+                }
+                catch (Exception ex)
+                {
+                    context.Error($"Unable to process file command '{fileCommand.ContextName}' successfully.");
+                    context.Error(ex);
+                    context.CommandResult = TaskResult.Failed;
+                }
+            }
+        }
+
+        private bool TryDeleteFile(string path)
+        {
+            if (!File.Exists(path))
+            {
+                return true;
+            }
+            try
+            {
+                File.Delete(path);
+            }
+            catch (Exception e)
+            {
+                _trace.Warning($"Unable to delete file {path} for reason: {e.ToString()}");
+                return false;
+            }
+            return true;
+        }
+    }
+
+    public interface IFileCommandExtension : IExtension
+    {
+        string ContextName { get; }
+        string FilePrefix { get; }
+
+        void ProcessCommand(IExecutionContext context, string filePath, ContainerInfo container);
+    }
+
+    public sealed class AddPathFileCommand : RunnerService, IFileCommandExtension
+    {
+        public string ContextName => "path";
+        public string FilePrefix => "add_path_";
+
+        public Type ExtensionType => typeof(IFileCommandExtension);
+
+        public void ProcessCommand(IExecutionContext context, string filePath, ContainerInfo container)
+        {
+            if (File.Exists(filePath))
+            {
+                var lines = File.ReadAllLines(filePath, Encoding.UTF8);
+                foreach(var line in lines)
+                {
+                    if (line == string.Empty)
+                    {
+                        continue;
+                    }
+                    context.Global.PrependPath.RemoveAll(x => string.Equals(x, line, StringComparison.CurrentCulture));
+                    context.Global.PrependPath.Add(line);
+                }
+            }
+        }
+    }
+
+    public sealed class SetEnvFileCommand : RunnerService, IFileCommandExtension
+    {
+        public string ContextName => "env";
+        public string FilePrefix => "set_env_";
+
+        public Type ExtensionType => typeof(IFileCommandExtension);
+
+        public void ProcessCommand(IExecutionContext context, string filePath, ContainerInfo container)
+        {
+            try
+            {
+                var text = File.ReadAllText(filePath) ?? string.Empty;
+                var index = 0;
+                var line = ReadLine(text, ref index);
+                while (line != null)
+                {
+                    if (!string.IsNullOrEmpty(line))
+                    {
+                        var equalsIndex = line.IndexOf("=", StringComparison.Ordinal);
+                        var heredocIndex = line.IndexOf("<<", StringComparison.Ordinal);
+
+                        // Normal style NAME=VALUE
+                        if (equalsIndex >= 0 && (heredocIndex < 0 || equalsIndex < heredocIndex))
+                        {
+                            var split = line.Split(new[] { '=' }, 2, StringSplitOptions.None);
+                            if (string.IsNullOrEmpty(line))
+                            {
+                                throw new Exception($"Invalid environment variable format '{line}'. Environment variable name must not be empty");
+                            }
+                            SetEnvironmentVariable(context, split[0], split[1]);
+                        }
+                        // Heredoc style NAME<<EOF
+                        else if (heredocIndex >= 0 && (equalsIndex < 0 || heredocIndex < equalsIndex))
+                        {
+                            var split = line.Split(new[] { "<<" }, 2, StringSplitOptions.None);
+                            if (string.IsNullOrEmpty(split[0]) || string.IsNullOrEmpty(split[1]))
+                            {
+                                throw new Exception($"Invalid environment variable format '{line}'. Environment variable name must not be empty and delimiter must not be empty");
+                            }
+                            var name = split[0];
+                            var delimiter = split[1];
+                            var startIndex = index; // Start index of the value (inclusive)
+                            var endIndex = index;   // End index of the value (exclusive)
+                            var tempLine = ReadLine(text, ref index, out var newline);
+                            while (!string.Equals(tempLine, delimiter, StringComparison.Ordinal))
+                            {
+                                if (tempLine == null)
+                                {
+                                    throw new Exception($"Invalid environment variable value. Matching delimiter not found '{delimiter}'");
+                                }
+                                endIndex = index - newline.Length;
+                                tempLine = ReadLine(text, ref index, out newline);
+                            }
+
+                            var value = endIndex > startIndex ? text.Substring(startIndex, endIndex - startIndex) : string.Empty;
+                            SetEnvironmentVariable(context, name, value);
+                        }
+                        else
+                        {
+                            throw new Exception($"Invalid environment variable format '{line}'");
+                        }
+                    }
+
+                    line = ReadLine(text, ref index);
+                }
+            }
+            catch (DirectoryNotFoundException)
+            {
+                context.Debug($"Environment variables file does not exist '{filePath}'");
+            }
+            catch (FileNotFoundException)
+            {
+                context.Debug($"Environment variables file does not exist '{filePath}'");
+            }
+        }
+
+        private static void SetEnvironmentVariable(
+            IExecutionContext context,
+            string name,
+            string value)
+        {
+            context.Global.EnvironmentVariables[name] = value;
+            context.SetEnvContext(name, value);
+            context.Debug($"{name}='{value}'");
+        }
+
+        private static string ReadLine(
+            string text,
+            ref int index)
+        {
+            return ReadLine(text, ref index, out _);
+        }
+
+        private static string ReadLine(
+            string text,
+            ref int index,
+            out string newline)
+        {
+            if (index >= text.Length)
+            {
+                newline = null;
+                return null;
+            }
+
+            var originalIndex = index;
+            var lfIndex = text.IndexOf("\n", index, StringComparison.Ordinal);
+            if (lfIndex < 0)
+            {
+                index = text.Length;
+                newline = null;
+                return text.Substring(originalIndex);
+            }
+
+#if OS_WINDOWS
+            var crLFIndex = text.IndexOf("\r\n", index, StringComparison.Ordinal);
+            if (crLFIndex >= 0 && crLFIndex < lfIndex)
+            {
+                index = crLFIndex + 2; // Skip over CRLF
+                newline = "\r\n";
+                return text.Substring(originalIndex, crLFIndex - originalIndex);
+            }
+#endif
+
+            index = lfIndex + 1; // Skip over LF
+            newline = "\n";
+            return text.Substring(originalIndex, lfIndex - originalIndex);
+        }
+    }
+}

src/Runner.Worker/GitHubContext.cs

@@ -6,17 +6,20 @@ namespace GitHub.Runner.Worker
 {
     public sealed class GitHubContext : DictionaryContextData, IEnvironmentContextData
     {
-        private readonly HashSet<string> _contextEnvWhitelist = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
+        private readonly HashSet<string> _contextEnvAllowlist = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
         {
             "action",
+            "action_path",
             "actor",
             "api_url",
             "base_ref",
+            "env",
             "event_name",
             "event_path",
             "graphql_url",
             "head_ref",
             "job",
+            "path",
             "ref",
             "repository",
             "repository_owner",
@@ -32,11 +35,23 @@ namespace GitHub.Runner.Worker
         {
             foreach (var data in this)
             {
-                if (_contextEnvWhitelist.Contains(data.Key) && data.Value is StringContextData value)
+                if (_contextEnvAllowlist.Contains(data.Key) && data.Value is StringContextData value)
                 {
                     yield return new KeyValuePair<string, string>($"GITHUB_{data.Key.ToUpperInvariant()}", value);
                 }
             }
         }
+
+        public GitHubContext ShallowCopy()
+        {
+            var copy = new GitHubContext();
+
+            foreach (var pair in this)
+            {
+                copy[pair.Key] = pair.Value;
+            }
+
+            return copy;
+        }
     }
 }

src/Runner.Worker/GlobalContext.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using GitHub.DistributedTask.WebApi;
+using GitHub.Runner.Common.Util;
+using GitHub.Runner.Worker.Container;
+
+namespace GitHub.Runner.Worker
+{
+    public sealed class GlobalContext
+    {
+        public ContainerInfo Container { get; set; }
+        public List<ServiceEndpoint> Endpoints { get; set; }
+        public IDictionary<String, String> EnvironmentVariables { get; set; }
+        public PlanFeatures Features { get; set; }
+        public IList<String> FileTable { get; set; }
+        public IDictionary<String, IDictionary<String, String>> JobDefaults { get; set; }
+        public TaskOrchestrationPlanReference Plan { get; set; }
+        public List<string> PrependPath { get; set; }
+        public List<ContainerInfo> ServiceContainers { get; set; }
+        public StepsContext StepsContext { get; set; }
+        public Variables Variables { get; set; }
+        public bool WriteDebug { get; set; }
+    }
+}

src/Runner.Worker/Handlers/CompositeActionHandler.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Text;
+using System.Threading;
 using System.Threading.Tasks;
 using GitHub.DistributedTask.ObjectTemplating.Tokens;
 using GitHub.DistributedTask.Pipelines.ContextData;
@@ -23,17 +24,13 @@ namespace GitHub.Runner.Worker.Handlers
     {
         public CompositeActionExecutionData Data { get; set; }
 
-        public Task RunAsync(ActionRunStage stage)
+        public async Task RunAsync(ActionRunStage stage)
         {
             // Validate args.
             Trace.Entering();
             ArgUtil.NotNull(ExecutionContext, nameof(ExecutionContext));
             ArgUtil.NotNull(Inputs, nameof(Inputs));
-
-            var githubContext = ExecutionContext.ExpressionValues["github"] as GitHubContext;
-            ArgUtil.NotNull(githubContext, nameof(githubContext));
-
-            var tempDirectory = HostContext.GetDirectory(WellKnownDirectory.Temp);
+            ArgUtil.NotNull(Data.Steps, nameof(Data.Steps));
 
             // Resolve action steps
             var actionSteps = Data.Steps;
@@ -45,73 +42,241 @@ namespace GitHub.Runner.Worker.Handlers
                 inputsData[i.Key] = new StringContextData(i.Value);
             }
 
-            // Add each composite action step to the front of the queue
-            int location = 0;
+            // Initialize Composite Steps List of Steps
+            var compositeSteps = new List<IStep>();
 
-            foreach (Pipelines.ActionStep aStep in actionSteps)
+            // Temporary hack until after M271-ish. After M271-ish the server will never send an empty
+            // context name. Generated context names start with "__"
+            var childScopeName = ExecutionContext.GetFullyQualifiedContextName();
+            if (string.IsNullOrEmpty(childScopeName))
             {
-                // Ex: 
-                // runs:
-                //      using: "composite"
-                //      steps:
-                //          - uses: example/test-composite@v2 (a)
-                //          - run echo hello world (b)
-                //          - run echo hello world 2 (c)
-                // 
-                // ethanchewy/test-composite/action.yaml
-                // runs:
-                //      using: "composite"
-                //      steps: 
-                //          - run echo hello world 3 (d)
-                //          - run echo hello world 4 (e)
-                // 
-                // Steps processed as follow:
-                // | a |
-                // | a | => | d |
-                // (Run step d)
-                // | a | 
-                // | a | => | e |
-                // (Run step e)
-                // | a | 
-                // (Run step a)
-                // | b | 
-                // (Run step b)
-                // | c |
-                // (Run step c)
-                // Done.
-
-                var actionRunner = HostContext.CreateService<IActionRunner>();
-                actionRunner.Action = aStep;
-                actionRunner.Stage = stage;
-                actionRunner.Condition = aStep.Condition;
-
-                var step = ExecutionContext.RegisterNestedStep(actionRunner, inputsData, location, Environment);
-
-                InitializeScope(step);
-
-                location++;
+                childScopeName = $"__{Guid.NewGuid()}";
             }
 
-            // Create a step that handles all the composite action steps' outputs
-            Pipelines.ActionStep cleanOutputsStep = new Pipelines.ActionStep();
-            cleanOutputsStep.ContextName = ExecutionContext.ContextName;
-            // Use the same reference type as our composite steps.
-            cleanOutputsStep.Reference = Action;
+            foreach (Pipelines.ActionStep actionStep in actionSteps)
+            {
+                var actionRunner = HostContext.CreateService<IActionRunner>();
+                actionRunner.Action = actionStep;
+                actionRunner.Stage = stage;
+                actionRunner.Condition = actionStep.Condition;
 
-            var actionRunner2 = HostContext.CreateService<IActionRunner>();
-            actionRunner2.Action = cleanOutputsStep;
-            actionRunner2.Stage = ActionRunStage.Main;
-            actionRunner2.Condition = "always()";
-            ExecutionContext.RegisterNestedStep(actionRunner2, inputsData, location, Environment, true);
+                var step = ExecutionContext.CreateCompositeStep(childScopeName, actionRunner, inputsData, Environment);
 
-            return Task.CompletedTask;
+                // Shallow copy github context
+                var gitHubContext = step.ExecutionContext.ExpressionValues["github"] as GitHubContext;
+                ArgUtil.NotNull(gitHubContext, nameof(gitHubContext));
+                gitHubContext = gitHubContext.ShallowCopy();
+                step.ExecutionContext.ExpressionValues["github"] = gitHubContext;
+
+                // Set GITHUB_ACTION_PATH
+                step.ExecutionContext.SetGitHubContext("action_path", ActionDirectory);
+
+                compositeSteps.Add(step);
+            }
+
+            try
+            {
+                // This is where we run each step.
+                await RunStepsAsync(compositeSteps);
+
+                // Get the pointer of the correct "steps" object and pass it to the ExecutionContext so that we can process the outputs correctly
+                ExecutionContext.ExpressionValues["inputs"] = inputsData;
+                ExecutionContext.ExpressionValues["steps"] = ExecutionContext.Global.StepsContext.GetScope(ExecutionContext.GetFullyQualifiedContextName());
+
+                ProcessCompositeActionOutputs();
+
+                ExecutionContext.Global.StepsContext.ClearScope(childScopeName);
+            }
+            catch (Exception ex)
+            {
+                // Composite StepRunner should never throw exception out.
+                Trace.Error($"Caught exception from composite steps {nameof(CompositeActionHandler)}: {ex}");
+                ExecutionContext.Error(ex);
+                ExecutionContext.Result = TaskResult.Failed;
+            }
         }
 
-        private void InitializeScope(IStep step)
+        private void ProcessCompositeActionOutputs()
         {
-            var stepsContext = step.ExecutionContext.StepsContext;
-            var scopeName = step.ExecutionContext.ScopeName;
-            step.ExecutionContext.ExpressionValues["steps"] = stepsContext.GetScope(scopeName);
+            ArgUtil.NotNull(ExecutionContext, nameof(ExecutionContext));
+
+            // Evaluate the mapped outputs value
+            if (Data.Outputs != null)
+            {
+                // Evaluate the outputs in the steps context to easily retrieve the values
+                var actionManifestManager = HostContext.GetService<IActionManifestManager>();
+
+                // Format ExpressionValues to Dictionary<string, PipelineContextData>
+                var evaluateContext = new Dictionary<string, PipelineContextData>(StringComparer.OrdinalIgnoreCase);
+                foreach (var pair in ExecutionContext.ExpressionValues)
+                {
+                    evaluateContext[pair.Key] = pair.Value;
+                }
+
+                // Get the evluated composite outputs' values mapped to the outputs named
+                DictionaryContextData actionOutputs = actionManifestManager.EvaluateCompositeOutputs(ExecutionContext, Data.Outputs, evaluateContext);
+
+                // Set the outputs for the outputs object in the whole composite action
+                // Each pair is structured like this
+                // We ignore "description" for now
+                // {
+                //   "the-output-name": {
+                //     "description": "",
+                //     "value": "the value"
+                //   },
+                //   ...
+                // }
+                foreach (var pair in actionOutputs)
+                {
+                    var outputsName = pair.Key;
+                    var outputsAttributes = pair.Value as DictionaryContextData;
+                    outputsAttributes.TryGetValue("value", out var val);
+
+                    if (val != null)
+                    {
+                        var outputsValue = val as StringContextData;
+                        // Set output in the whole composite scope. 
+                        if (!String.IsNullOrEmpty(outputsValue))
+                        {
+                            ExecutionContext.SetOutput(outputsName, outputsValue, out _);
+                        }
+                        else
+                        {
+                            ExecutionContext.SetOutput(outputsName, "", out _);
+                        }
+                    }
+                }
+            }
+        }
+
+        private async Task RunStepsAsync(List<IStep> compositeSteps)
+        {
+            ArgUtil.NotNull(compositeSteps, nameof(compositeSteps));
+
+            // The parent StepsRunner of the whole Composite Action Step handles the cancellation stuff already. 
+            foreach (IStep step in compositeSteps)
+            {
+                Trace.Info($"Processing composite step: DisplayName='{step.DisplayName}'");
+
+                step.ExecutionContext.ExpressionValues["steps"] = ExecutionContext.Global.StepsContext.GetScope(step.ExecutionContext.ScopeName);
+
+                // Populate env context for each step
+                Trace.Info("Initialize Env context for step");
+#if OS_WINDOWS
+                var envContext = new DictionaryContextData();
+#else
+                var envContext = new CaseSensitiveDictionaryContextData();
+#endif
+
+                // Global env
+                foreach (var pair in ExecutionContext.Global.EnvironmentVariables)
+                {
+                    envContext[pair.Key] = new StringContextData(pair.Value ?? string.Empty);
+                }
+
+                // Stomps over with outside step env
+                if (step.ExecutionContext.ExpressionValues.TryGetValue("env", out var envContextData))
+                {
+#if OS_WINDOWS
+                    var dict = envContextData as DictionaryContextData;
+#else
+                    var dict = envContextData as CaseSensitiveDictionaryContextData;
+#endif
+                    foreach (var pair in dict)
+                    {
+                        envContext[pair.Key] = pair.Value;
+                    }
+                }
+
+                step.ExecutionContext.ExpressionValues["env"] = envContext;
+
+                var actionStep = step as IActionRunner;
+
+                try
+                {
+                    // Evaluate and merge action's env block to env context
+                    var templateEvaluator = step.ExecutionContext.ToPipelineTemplateEvaluator();
+                    var actionEnvironment = templateEvaluator.EvaluateStepEnvironment(actionStep.Action.Environment, step.ExecutionContext.ExpressionValues, step.ExecutionContext.ExpressionFunctions, Common.Util.VarUtil.EnvironmentVariableKeyComparer);
+                    foreach (var env in actionEnvironment)
+                    {
+                        envContext[env.Key] = new StringContextData(env.Value ?? string.Empty);
+                    }
+                }
+                catch (Exception ex)
+                {
+                    // fail the step since there is an evaluate error.
+                    Trace.Info("Caught exception in Composite Steps Runner from expression for step.env");
+                    // evaluateStepEnvFailed = true;
+                    step.ExecutionContext.Error(ex);
+                    step.ExecutionContext.Complete(TaskResult.Failed);
+                }
+
+                await RunStepAsync(step);
+
+                // Directly after the step, check if the step has failed or cancelled
+                // If so, return that to the output
+                if (step.ExecutionContext.Result == TaskResult.Failed || step.ExecutionContext.Result == TaskResult.Canceled)
+                {
+                    ExecutionContext.Result = step.ExecutionContext.Result;
+                    break;
+                }
+
+                // TODO: Add compat for other types of steps.
+            }
+            // Completion Status handled by StepsRunner for the whole Composite Action Step
+        }
+
+        private async Task RunStepAsync(IStep step)
+        {
+            // Start the step.
+            Trace.Info("Starting the step.");
+            step.ExecutionContext.Debug($"Starting: {step.DisplayName}");
+
+            // TODO: Fix for Step Level Timeout Attributes for an individual Composite Run Step
+            // For now, we are not going to support this for an individual composite run step
+
+            var templateEvaluator = step.ExecutionContext.ToPipelineTemplateEvaluator();
+
+            await Common.Util.EncodingUtil.SetEncoding(HostContext, Trace, step.ExecutionContext.CancellationToken);
+
+            try
+            {
+                await step.RunAsync();
+            }
+            catch (OperationCanceledException ex)
+            {
+                if (step.ExecutionContext.CancellationToken.IsCancellationRequested &&
+                    !ExecutionContext.Root.CancellationToken.IsCancellationRequested)
+                {
+                    Trace.Error($"Caught timeout exception from step: {ex.Message}");
+                    step.ExecutionContext.Error("The action has timed out.");
+                    step.ExecutionContext.Result = TaskResult.Failed;
+                }
+                else
+                {
+                    Trace.Error($"Caught cancellation exception from step: {ex}");
+                    step.ExecutionContext.Error(ex);
+                    step.ExecutionContext.Result = TaskResult.Canceled;
+                }
+            }
+            catch (Exception ex)
+            {
+                // Log the error and fail the step.
+                Trace.Error($"Caught exception from step: {ex}");
+                step.ExecutionContext.Error(ex);
+                step.ExecutionContext.Result = TaskResult.Failed;
+            }
+
+            // Merge execution context result with command result
+            if (step.ExecutionContext.CommandResult != null)
+            {
+                step.ExecutionContext.Result = Common.Util.TaskResultUtil.MergeTaskResults(step.ExecutionContext.Result, step.ExecutionContext.CommandResult.Value);
+            }
+
+            Trace.Info($"Step result: {step.ExecutionContext.Result}");
+
+            // Complete the step context.
+            step.ExecutionContext.Debug($"Finishing: {step.DisplayName}");
         }
     }
 }

src/Runner.Worker/Handlers/CompositeActionOutputHandler.cs

@@ -1,53 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using GitHub.DistributedTask.ObjectTemplating.Schema;
-using GitHub.DistributedTask.ObjectTemplating.Tokens;
-using GitHub.DistributedTask.Pipelines.ContextData;
-using GitHub.DistributedTask.WebApi;
-using GitHub.Runner.Common;
-using GitHub.Runner.Sdk;
-using Pipelines = GitHub.DistributedTask.Pipelines;
-
-namespace GitHub.Runner.Worker.Handlers
-{
-    [ServiceLocator(Default = typeof(CompositeActionOutputHandler))]
-    public interface ICompositeActionOutputHandler : IHandler
-    {
-        CompositeActionExecutionData Data { get; set; }
-    }
-
-    public sealed class CompositeActionOutputHandler : Handler, ICompositeActionOutputHandler
-    {
-        public CompositeActionExecutionData Data { get; set; }
-
-
-        public Task RunAsync(ActionRunStage stage)
-        {
-            // Evaluate the mapped outputs value
-            if (Data.Outputs != null)
-            {
-                // Evaluate the outputs in the steps context to easily retrieve the values
-                var actionManifestManager = HostContext.GetService<IActionManifestManager>();
-
-                // Format ExpressionValues to Dictionary<string, PipelineContextData>
-                var evaluateContext = new Dictionary<string, PipelineContextData>(StringComparer.OrdinalIgnoreCase);
-                foreach (var pair in ExecutionContext.ExpressionValues)
-                {
-                    evaluateContext[pair.Key] = pair.Value;
-                }
-
-                // Get the evluated composite outputs' values mapped to the outputs named
-                DictionaryContextData actionOutputs = actionManifestManager.EvaluateCompositeOutputs(ExecutionContext, Data.Outputs, evaluateContext);
-
-                // Set the outputs for the outputs object in the whole composite action
-                actionManifestManager.SetAllCompositeOutputs(ExecutionContext.FinalizeContext, actionOutputs);
-            }
-
-            return Task.CompletedTask;
-        }
-    }
-}

src/Runner.Worker/Handlers/ContainerActionHandler.cs

@@ -49,8 +49,9 @@ namespace GitHub.Runner.Worker.Handlers
                 // ensure docker file exist
                 var dockerFile = Path.Combine(ActionDirectory, Data.Image);
                 ArgUtil.File(dockerFile, nameof(Data.Image));
-                ExecutionContext.Output($"Dockerfile for action: '{dockerFile}'.");
 
+                ExecutionContext.Output($"##[group]Building docker image");
+                ExecutionContext.Output($"Dockerfile for action: '{dockerFile}'.");
                 var imageName = $"{dockerManger.DockerInstanceLabel}:{ExecutionContext.Id.ToString("N")}";
                 var buildExitCode = await dockerManger.DockerBuild(
                     ExecutionContext,
@@ -58,6 +59,8 @@ namespace GitHub.Runner.Worker.Handlers
                     dockerFile,
                     Directory.GetParent(dockerFile).FullName,
                     imageName);
+                ExecutionContext.Output("##[endgroup]");
+
                 if (buildExitCode != 0)
                 {
                     throw new InvalidOperationException($"Docker build failed with exit code {buildExitCode}");
@@ -158,16 +161,21 @@ namespace GitHub.Runner.Worker.Handlers
             Directory.CreateDirectory(tempHomeDirectory);
             this.Environment["HOME"] = tempHomeDirectory;
 
+            var tempFileCommandDirectory = Path.Combine(tempDirectory, "_runner_file_commands");
+            ArgUtil.Directory(tempFileCommandDirectory, nameof(tempFileCommandDirectory));
+
             var tempWorkflowDirectory = Path.Combine(tempDirectory, "_github_workflow");
             ArgUtil.Directory(tempWorkflowDirectory, nameof(tempWorkflowDirectory));
 
             container.MountVolumes.Add(new MountVolume("/var/run/docker.sock", "/var/run/docker.sock"));
             container.MountVolumes.Add(new MountVolume(tempHomeDirectory, "/github/home"));
             container.MountVolumes.Add(new MountVolume(tempWorkflowDirectory, "/github/workflow"));
+            container.MountVolumes.Add(new MountVolume(tempFileCommandDirectory, "/github/file_commands"));
             container.MountVolumes.Add(new MountVolume(defaultWorkingDirectory, "/github/workspace"));
 
             container.AddPathTranslateMapping(tempHomeDirectory, "/github/home");
             container.AddPathTranslateMapping(tempWorkflowDirectory, "/github/workflow");
+            container.AddPathTranslateMapping(tempFileCommandDirectory, "/github/file_commands");
             container.AddPathTranslateMapping(defaultWorkingDirectory, "/github/workspace");
 
             container.ContainerWorkDirectory = "/github/workspace";
@@ -185,7 +193,7 @@ namespace GitHub.Runner.Worker.Handlers
             }
 
             // Add Actions Runtime server info
-            var systemConnection = ExecutionContext.Endpoints.Single(x => string.Equals(x.Name, WellKnownServiceEndpointNames.SystemVssConnection, StringComparison.OrdinalIgnoreCase));
+            var systemConnection = ExecutionContext.Global.Endpoints.Single(x => string.Equals(x.Name, WellKnownServiceEndpointNames.SystemVssConnection, StringComparison.OrdinalIgnoreCase));
             Environment["ACTIONS_RUNTIME_URL"] = systemConnection.Url.AbsoluteUri;
             Environment["ACTIONS_RUNTIME_TOKEN"] = systemConnection.Authorization.Parameters[EndpointAuthorizationParameters.AccessToken];
             if (systemConnection.Data.TryGetValue("CacheServerUrl", out var cacheUrl) && !string.IsNullOrEmpty(cacheUrl))

src/Runner.Worker/Handlers/Handler.cs

@@ -148,14 +148,14 @@ namespace GitHub.Runner.Worker.Handlers
         {
             // Validate args.
             Trace.Entering();
-            ArgUtil.NotNull(ExecutionContext.PrependPath, nameof(ExecutionContext.PrependPath));
-            if (ExecutionContext.PrependPath.Count == 0)
+            ArgUtil.NotNull(ExecutionContext.Global.PrependPath, nameof(ExecutionContext.Global.PrependPath));
+            if (ExecutionContext.Global.PrependPath.Count == 0)
             {
                 return;
             }
 
             // Prepend path.
-            string prepend = string.Join(Path.PathSeparator.ToString(), ExecutionContext.PrependPath.Reverse<string>());
+            string prepend = string.Join(Path.PathSeparator.ToString(), ExecutionContext.Global.PrependPath.Reverse<string>());
             var containerStepHost = StepHost as ContainerStepHost;
             if (containerStepHost != null)
             {

src/Runner.Worker/Handlers/HandlerFactory.cs

@@ -68,16 +68,8 @@ namespace GitHub.Runner.Worker.Handlers
             }
             else if (data.ExecutionType == ActionExecutionType.Composite)
             {
-                if (executionContext.FinalizeContext == null)
-                {
-                    handler = HostContext.CreateService<ICompositeActionHandler>();
-                    (handler as ICompositeActionHandler).Data = data as CompositeActionExecutionData;
-                }
-                else
-                {
-                    handler = HostContext.CreateService<ICompositeActionOutputHandler>();
-                    (handler as ICompositeActionOutputHandler).Data = data as CompositeActionExecutionData;
-                }
+                handler = HostContext.CreateService<ICompositeActionHandler>();
+                (handler as ICompositeActionHandler).Data = data as CompositeActionExecutionData;
             }
             else
             {

src/Runner.Worker/Handlers/NodeScriptActionHandler.cs

@@ -46,7 +46,7 @@ namespace GitHub.Runner.Worker.Handlers
             }
 
             // Add Actions Runtime server info
-            var systemConnection = ExecutionContext.Endpoints.Single(x => string.Equals(x.Name, WellKnownServiceEndpointNames.SystemVssConnection, StringComparison.OrdinalIgnoreCase));
+            var systemConnection = ExecutionContext.Global.Endpoints.Single(x => string.Equals(x.Name, WellKnownServiceEndpointNames.SystemVssConnection, StringComparison.OrdinalIgnoreCase));
             Environment["ACTIONS_RUNTIME_URL"] = systemConnection.Url.AbsoluteUri;
             Environment["ACTIONS_RUNTIME_TOKEN"] = systemConnection.Authorization.Parameters[EndpointAuthorizationParameters.AccessToken];
             if (systemConnection.Data.TryGetValue("CacheServerUrl", out var cacheUrl) && !string.IsNullOrEmpty(cacheUrl))
@@ -113,7 +113,7 @@ namespace GitHub.Runner.Worker.Handlers
                                                 requireExitCodeZero: false,
                                                 outputEncoding: outputEncoding,
                                                 killProcessOnCancel: false,
-                                                inheritConsoleHandler: !ExecutionContext.Variables.Retain_Default_Encoding,
+                                                inheritConsoleHandler: !ExecutionContext.Global.Variables.Retain_Default_Encoding,
                                                 cancellationToken: ExecutionContext.CancellationToken);
 
                 // Wait for either the node exit or force finish through ##vso command

src/Runner.Worker/Handlers/OutputManager.cs

@@ -31,7 +31,7 @@ namespace GitHub.Runner.Worker.Handlers
         {
             _executionContext = executionContext;
             _commandManager = commandManager;
-            _container = container ?? executionContext.Container;
+            _container = container ?? executionContext.Global.Container;
 
             // Recursion failsafe (test override)
             var failsafeString = Environment.GetEnvironmentVariable("RUNNER_TEST_GET_REPOSITORY_PATH_FAILSAFE");
@@ -41,7 +41,7 @@ namespace GitHub.Runner.Worker.Handlers
             }
 
             // Determine the timeout
-            var timeoutStr = _executionContext.Variables.Get(_timeoutKey);
+            var timeoutStr = _executionContext.Global.Variables.Get(_timeoutKey);
             if (string.IsNullOrEmpty(timeoutStr) ||
                 !TimeSpan.TryParse(timeoutStr, CultureInfo.InvariantCulture, out _timeout) ||
                 _timeout <= TimeSpan.Zero)

src/Runner.Worker/Handlers/ScriptHandler.cs

@@ -23,6 +23,19 @@ namespace GitHub.Runner.Worker.Handlers
 
         public override void PrintActionDetails(ActionRunStage stage)
         {
+            // We don't want to display the internal workings if composite (similar/equivalent information can be found in debug)
+            void writeDetails(string message)
+            {
+                if (ExecutionContext.InsideComposite)
+                {
+                    ExecutionContext.Debug(message);
+                }
+                else
+                {
+                    ExecutionContext.Output(message);
+                }
+            }
+
             if (stage == ActionRunStage.Post)
             {
                 throw new NotSupportedException("Script action should not have 'Post' job action.");
@@ -39,7 +52,7 @@ namespace GitHub.Runner.Worker.Handlers
                     firstLine = firstLine.Substring(0, firstNewLine);
                 }
 
-                ExecutionContext.Output($"##[group]Run {firstLine}");
+                writeDetails(ExecutionContext.InsideComposite ? $"Run {firstLine}" : $"##[group]Run {firstLine}");
             }
             else
             {
@@ -50,20 +63,20 @@ namespace GitHub.Runner.Worker.Handlers
             foreach (var line in multiLines)
             {
                 // Bright Cyan color
-                ExecutionContext.Output($"\x1b[36;1m{line}\x1b[0m");
+                writeDetails($"\x1b[36;1m{line}\x1b[0m");
             }
 
             string argFormat;
             string shellCommand;
             string shellCommandPath = null;
             bool validateShellOnHost = !(StepHost is ContainerStepHost);
-            string prependPath = string.Join(Path.PathSeparator.ToString(), ExecutionContext.PrependPath.Reverse<string>());
+            string prependPath = string.Join(Path.PathSeparator.ToString(), ExecutionContext.Global.PrependPath.Reverse<string>());
             string shell = null;
             if (!Inputs.TryGetValue("shell", out shell) || string.IsNullOrEmpty(shell))
             {
                 // TODO: figure out how defaults interact with template later
                 // for now, we won't check job.defaults if we are inside a template.
-                if (string.IsNullOrEmpty(ExecutionContext.ScopeName) && ExecutionContext.JobDefaults.TryGetValue("run", out var runDefaults))
+                if (string.IsNullOrEmpty(ExecutionContext.ScopeName) && ExecutionContext.Global.JobDefaults.TryGetValue("run", out var runDefaults))
                 {
                     runDefaults.TryGetValue("shell", out shell);
                 }
@@ -109,23 +122,23 @@ namespace GitHub.Runner.Worker.Handlers
 
             if (!string.IsNullOrEmpty(shellCommandPath))
             {
-                ExecutionContext.Output($"shell: {shellCommandPath} {argFormat}");
+                writeDetails($"shell: {shellCommandPath} {argFormat}");
             }
             else
             {
-                ExecutionContext.Output($"shell: {shellCommand} {argFormat}");
+                writeDetails($"shell: {shellCommand} {argFormat}");
             }
 
             if (this.Environment?.Count > 0)
             {
-                ExecutionContext.Output("env:");
+                writeDetails("env:");
                 foreach (var env in this.Environment)
                 {
-                    ExecutionContext.Output($"  {env.Key}: {env.Value}");
+                    writeDetails($"  {env.Key}: {env.Value}");
                 }
             }
 
-            ExecutionContext.Output("##[endgroup]");
+            writeDetails(ExecutionContext.InsideComposite ? "" : "##[endgroup]");
         }
 
         public async Task RunAsync(ActionRunStage stage)
@@ -151,9 +164,7 @@ namespace GitHub.Runner.Worker.Handlers
             string workingDirectory = null;
             if (!Inputs.TryGetValue("workingDirectory", out workingDirectory))
             {
-                // TODO: figure out how defaults interact with template later
-                // for now, we won't check job.defaults if we are inside a template.
-                if (string.IsNullOrEmpty(ExecutionContext.ScopeName) && ExecutionContext.JobDefaults.TryGetValue("run", out var runDefaults))
+                if (string.IsNullOrEmpty(ExecutionContext.ScopeName) && ExecutionContext.Global.JobDefaults.TryGetValue("run", out var runDefaults))
                 {
                     if (runDefaults.TryGetValue("working-directory", out workingDirectory))
                     {
@@ -167,9 +178,7 @@ namespace GitHub.Runner.Worker.Handlers
             string shell = null;
             if (!Inputs.TryGetValue("shell", out shell) || string.IsNullOrEmpty(shell))
             {
-                // TODO: figure out how defaults interact with template later
-                // for now, we won't check job.defaults if we are inside a template.
-                if (string.IsNullOrEmpty(ExecutionContext.ScopeName) && ExecutionContext.JobDefaults.TryGetValue("run", out var runDefaults))
+                if (string.IsNullOrEmpty(ExecutionContext.ScopeName) && ExecutionContext.Global.JobDefaults.TryGetValue("run", out var runDefaults))
                 {
                     if (runDefaults.TryGetValue("shell", out shell))
                     {
@@ -180,7 +189,7 @@ namespace GitHub.Runner.Worker.Handlers
 
             var isContainerStepHost = StepHost is ContainerStepHost;
 
-            string prependPath = string.Join(Path.PathSeparator.ToString(), ExecutionContext.PrependPath.Reverse<string>());
+            string prependPath = string.Join(Path.PathSeparator.ToString(), ExecutionContext.Global.PrependPath.Reverse<string>());
             string commandPath, argFormat, shellCommand;
             // Set up default command and arguments
             if (string.IsNullOrEmpty(shell))
@@ -232,7 +241,7 @@ namespace GitHub.Runner.Worker.Handlers
 #if OS_WINDOWS
             // Normalize Windows line endings
             contents = contents.Replace("\r\n", "\n").Replace("\n", "\r\n");
-            var encoding = ExecutionContext.Variables.Retain_Default_Encoding && Console.InputEncoding.CodePage != 65001
+            var encoding = ExecutionContext.Global.Variables.Retain_Default_Encoding && Console.InputEncoding.CodePage != 65001
                 ? Console.InputEncoding
                 : new UTF8Encoding(false);
 #else
@@ -285,7 +294,7 @@ namespace GitHub.Runner.Worker.Handlers
                                             requireExitCodeZero: false,
                                             outputEncoding: null,
                                             killProcessOnCancel: false,
-                                            inheritConsoleHandler: !ExecutionContext.Variables.Retain_Default_Encoding,
+                                            inheritConsoleHandler: !ExecutionContext.Global.Variables.Retain_Default_Encoding,
                                             cancellationToken: ExecutionContext.CancellationToken);
 
                 // Error

src/Runner.Worker/JobExtension.cs

@@ -162,7 +162,7 @@ namespace GitHub.Runner.Worker
                         var environmentVariables = templateEvaluator.EvaluateStepEnvironment(token, jobContext.ExpressionValues, jobContext.ExpressionFunctions, VarUtil.EnvironmentVariableKeyComparer);
                         foreach (var pair in environmentVariables)
                         {
-                            context.EnvironmentVariables[pair.Key] = pair.Value ?? string.Empty;
+                            context.Global.EnvironmentVariables[pair.Key] = pair.Value ?? string.Empty;
                             context.SetEnvContext(pair.Key, pair.Value ?? string.Empty);
                         }
                     }
@@ -172,7 +172,7 @@ namespace GitHub.Runner.Worker
                     var container = templateEvaluator.EvaluateJobContainer(message.JobContainer, jobContext.ExpressionValues, jobContext.ExpressionFunctions);
                     if (container != null)
                     {
-                        jobContext.Container = new Container.ContainerInfo(HostContext, container);
+                        jobContext.Global.Container = new Container.ContainerInfo(HostContext, container);
                     }
 
                     // Evaluate the job service containers
@@ -184,7 +184,7 @@ namespace GitHub.Runner.Worker
                         {
                             var networkAlias = pair.Key;
                             var serviceContainer = pair.Value;
-                            jobContext.ServiceContainers.Add(new Container.ContainerInfo(HostContext, serviceContainer, false, networkAlias));
+                            jobContext.Global.ServiceContainers.Add(new Container.ContainerInfo(HostContext, serviceContainer, false, networkAlias));
                         }
                     }
 
@@ -195,14 +195,14 @@ namespace GitHub.Runner.Worker
                         var defaults = token.AssertMapping("defaults");
                         if (defaults.Any(x => string.Equals(x.Key.AssertString("defaults key").Value, "run", StringComparison.OrdinalIgnoreCase)))
                         {
-                            context.JobDefaults["run"] = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+                            context.Global.JobDefaults["run"] = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
                             var defaultsRun = defaults.First(x => string.Equals(x.Key.AssertString("defaults key").Value, "run", StringComparison.OrdinalIgnoreCase));
                             var jobDefaults = templateEvaluator.EvaluateJobDefaultsRun(defaultsRun.Value, jobContext.ExpressionValues, jobContext.ExpressionFunctions);
                             foreach (var pair in jobDefaults)
                             {
                                 if (!string.IsNullOrEmpty(pair.Value))
                                 {
-                                    context.JobDefaults["run"][pair.Key] = pair.Value;
+                                    context.Global.JobDefaults["run"][pair.Key] = pair.Value;
                                 }
                             }
                         }
@@ -216,15 +216,15 @@ namespace GitHub.Runner.Worker
                     preJobSteps.AddRange(prepareResult.ContainerSetupSteps);
 
                     // Add start-container steps, record and stop-container steps
-                    if (jobContext.Container != null || jobContext.ServiceContainers.Count > 0)
+                    if (jobContext.Global.Container != null || jobContext.Global.ServiceContainers.Count > 0)
                     {
                         var containerProvider = HostContext.GetService<IContainerOperationProvider>();
                         var containers = new List<Container.ContainerInfo>();
-                        if (jobContext.Container != null)
+                        if (jobContext.Global.Container != null)
                         {
-                            containers.Add(jobContext.Container);
+                            containers.Add(jobContext.Global.Container);
                         }
-                        containers.AddRange(jobContext.ServiceContainers);
+                        containers.AddRange(jobContext.Global.ServiceContainers);
 
                         preJobSteps.Add(new JobExtensionRunner(runAsync: containerProvider.StartContainersAsync,
                                                                           condition: $"{PipelineTemplateConstants.Success}()",
@@ -296,7 +296,7 @@ namespace GitHub.Runner.Worker
                         {
                             ArgUtil.NotNull(actionStep, step.DisplayName);
                             intraActionStates.TryGetValue(actionStep.Action.Id, out var intraActionState);
-                            actionStep.ExecutionContext = jobContext.CreateChild(actionStep.Action.Id, actionStep.DisplayName, actionStep.Action.Name, actionStep.Action.ScopeName, actionStep.Action.ContextName, intraActionState);
+                            actionStep.ExecutionContext = jobContext.CreateChild(actionStep.Action.Id, actionStep.DisplayName, actionStep.Action.Name, null, actionStep.Action.ContextName, intraActionState);
                         }
                     }
 
@@ -305,7 +305,7 @@ namespace GitHub.Runner.Worker
                     steps.AddRange(jobSteps);
 
                     // Prepare for orphan process cleanup
-                    _processCleanup = jobContext.Variables.GetBoolean("process.clean") ?? true;
+                    _processCleanup = jobContext.Global.Variables.GetBoolean("process.clean") ?? true;
                     if (_processCleanup)
                     {
                         // Set the RUNNER_TRACKING_ID env variable.
@@ -376,13 +376,13 @@ namespace GitHub.Runner.Worker
                             var envContext = new CaseSensitiveDictionaryContextData();
 #endif
                             context.ExpressionValues["env"] = envContext;
-                            foreach (var pair in context.EnvironmentVariables)
+                            foreach (var pair in context.Global.EnvironmentVariables)
                             {
                                 envContext[pair.Key] = new StringContextData(pair.Value ?? string.Empty);
                             }
 
                             Trace.Info("Initialize steps context for evaluating job outputs");
-                            context.ExpressionValues["steps"] = context.StepsContext.GetScope(context.ScopeName);
+                            context.ExpressionValues["steps"] = context.Global.StepsContext.GetScope(context.ScopeName);
 
                             var templateEvaluator = context.ToPipelineTemplateEvaluator();
                             var outputs = templateEvaluator.EvaluateJobOutput(message.JobOutputs, context.ExpressionValues, context.ExpressionFunctions);
@@ -413,7 +413,7 @@ namespace GitHub.Runner.Worker
                         }
                     }
 
-                    if (context.Variables.GetBoolean(Constants.Variables.Actions.RunnerDebug) ?? false)
+                    if (context.Global.Variables.GetBoolean(Constants.Variables.Actions.RunnerDebug) ?? false)
                     {
                         Trace.Info("Support log upload starting.");
                         context.Output("Uploading runner diagnostic logs");

src/Runner.Worker/JobRunner.cs

@@ -99,7 +99,7 @@ namespace GitHub.Runner.Worker
                     return await CompleteJobAsync(jobServer, jobContext, message, TaskResult.Failed);
                 }
 
-                if (jobContext.WriteDebug)
+                if (jobContext.Global.WriteDebug)
                 {
                     jobContext.SetRunnerContext("debug", "1");
                 }
@@ -152,7 +152,7 @@ namespace GitHub.Runner.Worker
                 {
                     foreach (var step in jobSteps)
                     {
-                        jobContext.JobSteps.Add(step);
+                        jobContext.JobSteps.Enqueue(step);
                     }
 
                     await stepsRunner.RunAsync(jobContext);
@@ -209,7 +209,7 @@ namespace GitHub.Runner.Worker
             // Clean TEMP after finish process jobserverqueue, since there might be a pending fileupload still use the TEMP dir.
             _tempDirectoryManager?.CleanupTempDirectory();
 
-            if (!jobContext.Features.HasFlag(PlanFeatures.JobCompletedPlanEvent))
+            if (!jobContext.Global.Features.HasFlag(PlanFeatures.JobCompletedPlanEvent))
             {
                 Trace.Info($"Skip raise job completed event call from worker because Plan version is {message.Plan.Version}");
                 return result;

src/Runner.Worker/RunnerPluginManager.cs

@@ -100,12 +100,12 @@ namespace GitHub.Runner.Worker
             RunnerActionPluginExecutionContext pluginContext = new RunnerActionPluginExecutionContext
             {
                 Inputs = inputs,
-                Endpoints = context.Endpoints,
+                Endpoints = context.Global.Endpoints,
                 Context = context.ExpressionValues
             };
 
             // variables
-            foreach (var variable in context.Variables.AllVariables)
+            foreach (var variable in context.Global.Variables.AllVariables)
             {
                 pluginContext.Variables[variable.Name] = new VariableValue(variable.Value, variable.Secret);
             }

src/Runner.Worker/StepsContext.cs

@@ -15,6 +15,14 @@ namespace GitHub.Runner.Worker
         private static readonly Regex _propertyRegex = new Regex("^[a-zA-Z_][a-zA-Z0-9_]*$", RegexOptions.Compiled);
         private readonly DictionaryContextData _contextData = new DictionaryContextData();
 
+        public void ClearScope(string scopeName)
+        {
+            if (_contextData.TryGetValue(scopeName, out _))
+            {
+                _contextData[scopeName] = new DictionaryContextData();
+            } 
+        }
+
         public DictionaryContextData GetScope(string scopeName)
         {
             if (scopeName == null)

src/Runner.Worker/StepsRunner.cs

@@ -59,18 +59,18 @@ namespace GitHub.Runner.Worker
                     checkPostJobActions = true;
                     while (jobContext.PostJobSteps.TryPop(out var postStep))
                     {
-                        jobContext.JobSteps.Add(postStep);
+                        jobContext.JobSteps.Enqueue(postStep);
                     }
 
                     continue;
                 }
 
-                var step = jobContext.JobSteps[0];
-                jobContext.JobSteps.RemoveAt(0);
+                var step = jobContext.JobSteps.Dequeue();
 
                 Trace.Info($"Processing step: DisplayName='{step.DisplayName}'");
                 ArgUtil.NotNull(step.ExecutionContext, nameof(step.ExecutionContext));
-                ArgUtil.NotNull(step.ExecutionContext.Variables, nameof(step.ExecutionContext.Variables));
+                ArgUtil.NotNull(step.ExecutionContext.Global, nameof(step.ExecutionContext.Global));
+                ArgUtil.NotNull(step.ExecutionContext.Global.Variables, nameof(step.ExecutionContext.Global.Variables));
 
                 // Start
                 step.ExecutionContext.Start();
@@ -82,7 +82,7 @@ namespace GitHub.Runner.Worker
                 step.ExecutionContext.ExpressionFunctions.Add(new FunctionInfo<SuccessFunction>(PipelineTemplateConstants.Success, 0, 0));
                 step.ExecutionContext.ExpressionFunctions.Add(new FunctionInfo<HashFilesFunction>(PipelineTemplateConstants.HashFiles, 1, byte.MaxValue));
 
-                step.ExecutionContext.ExpressionValues["steps"] = step.ExecutionContext.StepsContext.GetScope(step.ExecutionContext.ScopeName);
+                step.ExecutionContext.ExpressionValues["steps"] = step.ExecutionContext.Global.StepsContext.GetScope(step.ExecutionContext.ScopeName);
 
                 // Populate env context for each step
                 Trace.Info("Initialize Env context for step");
@@ -93,30 +93,22 @@ namespace GitHub.Runner.Worker
 #endif
 
                 // Global env
-                foreach (var pair in step.ExecutionContext.EnvironmentVariables)
+                foreach (var pair in step.ExecutionContext.Global.EnvironmentVariables)
                 {
                     envContext[pair.Key] = new StringContextData(pair.Value ?? string.Empty);
                 }
 
-                // Stomps over with outside step env
-                if (step.ExecutionContext.ExpressionValues.TryGetValue("env", out var envContextData))
-                {
-#if OS_WINDOWS
-                    var dict = envContextData as DictionaryContextData;
-#else
-                    var dict = envContextData as CaseSensitiveDictionaryContextData;
-#endif
-                    foreach (var pair in dict)
-                    {
-                        envContext[pair.Key] = pair.Value;
-                    }
-                }
-
                 step.ExecutionContext.ExpressionValues["env"] = envContext;
 
                 bool evaluateStepEnvFailed = false;
                 if (step is IActionRunner actionStep)
                 {
+                    // Shallow copy github context
+                    var gitHubContext = step.ExecutionContext.ExpressionValues["github"] as GitHubContext;
+                    ArgUtil.NotNull(gitHubContext, nameof(gitHubContext));
+                    gitHubContext = gitHubContext.ShallowCopy();
+                    step.ExecutionContext.ExpressionValues["github"] = gitHubContext;
+
                     // Set GITHUB_ACTION
                     step.ExecutionContext.SetGitHubContext("action", actionStep.Action.Name);
 
@@ -300,40 +292,7 @@ namespace GitHub.Runner.Worker
                 step.ExecutionContext.SetTimeout(timeout);
             }
 
-#if OS_WINDOWS
-            try
-            {
-                if (Console.InputEncoding.CodePage != 65001)
-                {
-                    using (var p = HostContext.CreateService<IProcessInvoker>())
-                    {
-                        // Use UTF8 code page
-                        int exitCode = await p.ExecuteAsync(workingDirectory: HostContext.GetDirectory(WellKnownDirectory.Work),
-                                                fileName: WhichUtil.Which("chcp", true, Trace),
-                                                arguments: "65001",
-                                                environment: null,
-                                                requireExitCodeZero: false,
-                                                outputEncoding: null,
-                                                killProcessOnCancel: false,
-                                                redirectStandardIn: null,
-                                                inheritConsoleHandler: true,
-                                                cancellationToken: step.ExecutionContext.CancellationToken);
-                        if (exitCode == 0)
-                        {
-                            Trace.Info("Successfully returned to code page 65001 (UTF8)");
-                        }
-                        else
-                        {
-                            Trace.Warning($"'chcp 65001' failed with exit code {exitCode}");
-                        }
-                    }
-                }
-            }
-            catch (Exception ex)
-            {
-                Trace.Warning($"'chcp 65001' failed with exception {ex.Message}");
-            }
-#endif
+            await EncodingUtil.SetEncoding(HostContext, Trace, step.ExecutionContext.CancellationToken);
 
             try
             {

src/Runner.Worker/action_yaml.json

@@ -108,19 +108,26 @@
             }
         },
         "composite-steps": {
-            "context": [
-                "github",
-                "strategy",
-                "matrix",
-                "steps",
-                "inputs",
-                "job",
-                "runner",
-                "env",
-                "hashFiles(1,255)"
-            ],
             "sequence": {
-                "item-type": "any"
+                "item-type": "composite-step"
+            }
+        },
+        "composite-step": {
+            "mapping": {
+                "properties": {
+                    "name": "string-steps-context",
+                    "id": "non-empty-string",
+                    "run": {
+                        "type": "string-steps-context",
+                        "required": true
+                    },
+                    "env": "step-env",
+                    "working-directory": "string-steps-context",
+                    "shell": {
+                        "type": "non-empty-string",
+                        "required": true
+                    }
+                }
             }
         },
         "container-runs-context": {
@@ -157,6 +164,37 @@
             "string": {
                 "require-non-empty": true
             }
+        },
+        "string-steps-context": {
+            "context": [
+                "github",
+                "inputs",
+                "strategy",
+                "matrix",
+                "steps",
+                "job",
+                "runner",
+                "env",
+                "hashFiles(1,255)"
+            ],
+            "string": {}
+        },
+        "step-env": {
+            "context": [
+                "github",
+                "inputs",
+                "strategy",
+                "matrix",
+                "steps",
+                "job",
+                "runner",
+                "env",
+                "hashFiles(1,255)"
+            ],
+            "mapping": {
+                "loose-key-type": "non-empty-string",
+                "loose-value-type": "string"
+            }
         }
     }
-}
+}

src/Sdk/DTPipelines/Pipelines/ActionStep.cs

@@ -24,7 +24,6 @@ namespace GitHub.DistributedTask.Pipelines
             Environment = actionToClone.Environment?.Clone();
             Inputs = actionToClone.Inputs?.Clone();
             ContextName = actionToClone?.ContextName;
-            ScopeName = actionToClone?.ScopeName;
             DisplayNameToken = actionToClone.DisplayNameToken?.Clone();
         }
 
@@ -41,9 +40,6 @@ namespace GitHub.DistributedTask.Pipelines
         [DataMember(EmitDefaultValue = false)]
         public TemplateToken DisplayNameToken { get; set; }
 
-        [DataMember(EmitDefaultValue = false)]
-        public String ScopeName { get; set; }
-
         [DataMember(EmitDefaultValue = false)]
         public String ContextName { get; set; }
 

src/Sdk/DTPipelines/Pipelines/AgentJobRequestMessage.cs

@@ -39,7 +39,6 @@ namespace GitHub.DistributedTask.Pipelines
             DictionaryContextData contextData,
             WorkspaceOptions workspaceOptions,
             IEnumerable<JobStep> steps,
-            IEnumerable<ContextScope> scopes,
             IList<String> fileTable,
             TemplateToken jobOutputs,
             IList<TemplateToken> defaults)
@@ -60,11 +59,6 @@ namespace GitHub.DistributedTask.Pipelines
             m_maskHints = new List<MaskHint>(maskHints);
             m_steps = new List<JobStep>(steps);
 
-            if (scopes != null)
-            {
-                m_scopes = new List<ContextScope>(scopes);
-            }
-
             if (environmentVariables?.Count > 0)
             {
                 m_environmentVariables = new List<TemplateToken>(environmentVariables);
@@ -261,18 +255,6 @@ namespace GitHub.DistributedTask.Pipelines
             }
         }
 
-        public IList<ContextScope> Scopes
-        {
-            get
-            {
-                if (m_scopes == null)
-                {
-                    m_scopes = new List<ContextScope>();
-                }
-                return m_scopes;
-            }
-        }
-
         /// <summary>
         /// Gets the table of files used when parsing the pipeline (e.g. yaml files)
         /// </summary>
@@ -415,11 +397,6 @@ namespace GitHub.DistributedTask.Pipelines
                 m_maskHints = new List<MaskHint>(this.m_maskHints.Distinct());
             }
 
-            if (m_scopes?.Count == 0)
-            {
-                m_scopes = null;
-            }
-
             if (m_variables?.Count == 0)
             {
                 m_variables = null;
@@ -447,9 +424,6 @@ namespace GitHub.DistributedTask.Pipelines
         [DataMember(Name = "Steps", EmitDefaultValue = false)]
         private List<JobStep> m_steps;
 
-        [DataMember(Name = "Scopes", EmitDefaultValue = false)]
-        private List<ContextScope> m_scopes;
-
         [DataMember(Name = "Variables", EmitDefaultValue = false)]
         private IDictionary<String, VariableValue> m_variables;
 

src/Sdk/DTPipelines/Pipelines/ContextScope.cs

@@ -1,53 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.ComponentModel;
-using System.Runtime.Serialization;
-using GitHub.DistributedTask.ObjectTemplating.Tokens;
-using Newtonsoft.Json;
-
-namespace GitHub.DistributedTask.Pipelines
-{
-    [DataContract]
-    [EditorBrowsable(EditorBrowsableState.Never)]
-    public sealed class ContextScope
-    {
-        [DataMember(EmitDefaultValue = false)]
-        public String Name { get; set; }
-
-        [IgnoreDataMember]
-        public String ContextName
-        {
-            get
-            {
-                var index = Name.LastIndexOf('.');
-                if (index >= 0)
-                {
-                    return Name.Substring(index + 1);
-                }
-
-                return Name;
-            }
-        }
-
-        [IgnoreDataMember]
-        public String ParentName
-        {
-            get
-            {
-                var index = Name.LastIndexOf('.');
-                if (index >= 0)
-                {
-                    return Name.Substring(0, index);
-                }
-
-                return String.Empty;
-            }
-        }
-
-        [DataMember(EmitDefaultValue = false)]
-        public TemplateToken Inputs { get; set; }
-
-        [DataMember(EmitDefaultValue = false)]
-        public TemplateToken Outputs { get; set; }
-    }
-}

src/Sdk/DTPipelines/Pipelines/ObjectTemplating/PipelineTemplateConstants.cs

@@ -11,8 +11,7 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
         public const String BooleanStrategyContext = "boolean-strategy-context";
         public const String CancelTimeoutMinutes = "cancel-timeout-minutes";
         public const String Cancelled = "cancelled";
-        public const String Checkout = "checkout";
-        public const String Clean = "clean";
+        public const String Clean= "clean";
         public const String Container = "container";
         public const String ContinueOnError = "continue-on-error";
         public const String Defaults = "defaults";
@@ -23,7 +22,6 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
         public const String FailFast = "fail-fast";
         public const String Failure = "failure";
         public const String FetchDepth = "fetch-depth";
-        public const String GeneratedId = "generated-id";
         public const String GitHub = "github";
         public const String HashFiles = "hashFiles";
         public const String Id = "id";
@@ -36,7 +34,6 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
         public const String JobIfResult = "job-if-result";
         public const String JobOutputs = "job-outputs";
         public const String Jobs = "jobs";
-        public const String Labels = "labels";
         public const String Lfs = "lfs";
         public const String Matrix = "matrix";
         public const String MaxParallel = "max-parallel";
@@ -52,24 +49,18 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
         public const String Pool = "pool";
         public const String Ports = "ports";
         public const String Result = "result";
-        public const String RunDisplayPrefix = "Run ";
         public const String Run = "run";
+        public const String RunDisplayPrefix = "Run ";
         public const String Runner = "runner";
         public const String RunsOn = "runs-on";
-        public const String Scope = "scope";
-        public const String Scopes = "scopes";
         public const String Secrets = "secrets";
         public const String Services = "services";
         public const String Shell = "shell";
         public const String Skipped = "skipped";
         public const String StepEnv = "step-env";
         public const String StepIfResult = "step-if-result";
-        public const String Steps = "steps";
-        public const String StepsInTemplate = "steps-in-template";
-        public const String StepsScopeInputs = "steps-scope-inputs";
-        public const String StepsScopeOutputs = "steps-scope-outputs";
-        public const String StepsTemplateRoot = "steps-template-root";
         public const String StepWith = "step-with";
+        public const String Steps = "steps";
         public const String Strategy = "strategy";
         public const String StringStepsContext = "string-steps-context";
         public const String StringStrategyContext = "string-strategy-context";
@@ -77,7 +68,6 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
         public const String Success = "success";
         public const String Template = "template";
         public const String TimeoutMinutes = "timeout-minutes";
-        public const String Token = "token";
         public const String Uses = "uses";
         public const String VmImage = "vmImage";
         public const String Volumes = "volumes";

src/Sdk/DTPipelines/Pipelines/ObjectTemplating/PipelineTemplateConverter.cs

@@ -1,6 +1,6 @@
 using System;
 using System.Collections.Generic;
-using System.Globalization;
+using System.ComponentModel;
 using System.Linq;
 using GitHub.DistributedTask.Expressions2;
 using GitHub.DistributedTask.Expressions2.Sdk;
@@ -14,8 +14,62 @@ using Newtonsoft.Json.Linq;
 
 namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
 {
-    internal static class PipelineTemplateConverter
+    [EditorBrowsable(EditorBrowsableState.Never)]
+    public static class PipelineTemplateConverter
     {
+        public static List<Step> ConvertToSteps(
+            TemplateContext context,
+            TemplateToken steps)
+        {
+            var stepsSequence = steps.AssertSequence($"job {PipelineTemplateConstants.Steps}");
+
+            var result = new List<Step>();
+            var nameBuilder = new ReferenceNameBuilder();
+            foreach (var stepsItem in stepsSequence)
+            {
+                var step = ConvertToStep(context, stepsItem, nameBuilder);
+                if (step != null) // step = null means we are hitting error during step conversion, there should be an error in context.errors
+                {
+                    if (step.Enabled)
+                    {
+                        result.Add(step);
+                    }
+                }
+            }
+
+            // Generate context name if empty
+            foreach (ActionStep step in result)
+            {
+                if (!String.IsNullOrEmpty(step.ContextName))
+                {
+                    continue;
+                }
+
+                var name = default(string);
+                switch (step.Reference.Type)
+                {
+                    case ActionSourceType.ContainerRegistry:
+                        var containerReference = step.Reference as ContainerRegistryReference;
+                        name = containerReference.Image;
+                        break;
+                    case ActionSourceType.Repository:
+                        var repositoryReference = step.Reference as RepositoryPathReference;
+                        name = !String.IsNullOrEmpty(repositoryReference.Name) ? repositoryReference.Name : PipelineConstants.SelfAlias;
+                        break;
+                }
+
+                if (String.IsNullOrEmpty(name))
+                {
+                    name = "run";
+                }
+
+                nameBuilder.AppendSegment($"__{name}");
+                step.ContextName = nameBuilder.Build();
+            }
+
+            return result;
+        }
+
         internal static Boolean ConvertToIfResult(
             TemplateContext context,
             TemplateToken ifResult)
@@ -29,6 +83,7 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
             var evaluationResult = EvaluationResult.CreateIntermediateResult(null, ifResult);
             return evaluationResult.IsTruthy;
         }
+
         internal static Boolean? ConvertToStepContinueOnError(
             TemplateContext context,
             TemplateToken token,
@@ -264,32 +319,10 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
             return result;
         }
 
-        //Note: originally was List<Step> but we need to change to List<ActionStep> to use the "Inputs" attribute
-        internal static List<ActionStep> ConvertToSteps(
-            TemplateContext context,
-            TemplateToken steps)
-        {
-            var stepsSequence = steps.AssertSequence($"job {PipelineTemplateConstants.Steps}");
-
-            var result = new List<ActionStep>();
-            foreach (var stepsItem in stepsSequence)
-            {
-                var step = ConvertToStep(context, stepsItem);
-                if (step != null) // step = null means we are hitting error during step conversion, there should be an error in context.errors
-                {
-                    if (step.Enabled)
-                    {
-                        result.Add(step);
-                    }
-                }
-            }
-
-            return result;
-        }
-
         private static ActionStep ConvertToStep(
             TemplateContext context,
-            TemplateToken stepsItem)
+            TemplateToken stepsItem,
+            ReferenceNameBuilder nameBuilder)
         {
             var step = stepsItem.AssertMapping($"{PipelineTemplateConstants.Steps} item");
             var continueOnError = default(ScalarToken);
@@ -299,7 +332,6 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
             var ifToken = default(ScalarToken);
             var name = default(ScalarToken);
             var run = default(ScalarToken);
-            var scope = default(StringToken);
             var timeoutMinutes = default(ScalarToken);
             var uses = default(StringToken);
             var with = default(TemplateToken);
@@ -337,9 +369,12 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
 
                     case PipelineTemplateConstants.Id:
                         id = stepProperty.Value.AssertString($"{PipelineTemplateConstants.Steps} item {PipelineTemplateConstants.Id}");
-                        if (!NameValidation.IsValid(id.Value, true))
+                        if (!String.IsNullOrEmpty(id.Value))
                         {
-                            context.Error(id, $"Step id {id.Value} is invalid. Ids must start with a letter or '_' and contain only alphanumeric characters, '-', or '_'");
+                            if (!nameBuilder.TryAddKnownName(id.Value, out var error))
+                            {
+                                context.Error(id, error);
+                            }
                         }
                         break;
 
@@ -367,10 +402,6 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
                         shell = stepProperty.Value.AssertScalar($"{PipelineTemplateConstants.Steps} item {PipelineTemplateConstants.Shell}");
                         break;
 
-                    case PipelineTemplateConstants.Scope:
-                        scope = stepProperty.Value.AssertString($"{PipelineTemplateConstants.Steps} item {PipelineTemplateConstants.Scope}");
-                        break;
-
                     case PipelineTemplateConstants.Submodules:
                         submodules = stepProperty.Value.AssertScalar($"{PipelineTemplateConstants.Steps} item {PipelineTemplateConstants.Submodules}");
                         break;
@@ -400,14 +431,12 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
             }
 
             // Fixup the if-condition
-            var isDefaultScope = String.IsNullOrEmpty(scope?.Value);
-            ifCondition = ConvertToIfCondition(context, ifToken, false, isDefaultScope);
+            ifCondition = ConvertToIfCondition(context, ifToken, false);
 
             if (run != null)
             {
                 var result = new ActionStep
                 {
-                    ScopeName = scope?.Value,
                     ContextName = id?.Value,
                     ContinueOnError = continueOnError,
                     DisplayNameToken = name,
@@ -439,7 +468,6 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
                 uses.AssertString($"{PipelineTemplateConstants.Steps} item {PipelineTemplateConstants.Uses}");
                 var result = new ActionStep
                 {
-                    ScopeName = scope?.Value,
                     ContextName = id?.Value,
                     ContinueOnError = continueOnError,
                     DisplayNameToken = name,
@@ -503,8 +531,7 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
         private static String ConvertToIfCondition(
             TemplateContext context,
             TemplateToken token,
-            Boolean isJob,
-            Boolean isDefaultScope)
+            Boolean isJob)
         {
             String condition;
             if (token is null)
@@ -537,7 +564,7 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
             }
             else
             {
-                namedValues = isDefaultScope ? s_stepNamedValues : s_stepInTemplateNamedValues;
+                namedValues = s_stepNamedValues;
                 functions = s_stepConditionFunctions;
             }
 
@@ -589,18 +616,6 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
             new NamedValueInfo<NoOperationNamedValue>(PipelineTemplateConstants.Env),
             new NamedValueInfo<NoOperationNamedValue>(PipelineTemplateConstants.Needs),
         };
-        private static readonly INamedValueInfo[] s_stepInTemplateNamedValues = new INamedValueInfo[]
-        {
-            new NamedValueInfo<NoOperationNamedValue>(PipelineTemplateConstants.Strategy),
-            new NamedValueInfo<NoOperationNamedValue>(PipelineTemplateConstants.Matrix),
-            new NamedValueInfo<NoOperationNamedValue>(PipelineTemplateConstants.Steps),
-            new NamedValueInfo<NoOperationNamedValue>(PipelineTemplateConstants.Inputs),
-            new NamedValueInfo<NoOperationNamedValue>(PipelineTemplateConstants.GitHub),
-            new NamedValueInfo<NoOperationNamedValue>(PipelineTemplateConstants.Job),
-            new NamedValueInfo<NoOperationNamedValue>(PipelineTemplateConstants.Runner),
-            new NamedValueInfo<NoOperationNamedValue>(PipelineTemplateConstants.Env),
-            new NamedValueInfo<NoOperationNamedValue>(PipelineTemplateConstants.Needs),
-        };
         private static readonly IFunctionInfo[] s_stepConditionFunctions = new IFunctionInfo[]
         {
             new FunctionInfo<NoOperation>(PipelineTemplateConstants.Always, 0, 0),

src/Sdk/DTPipelines/Pipelines/ObjectTemplating/PipelineTemplateEvaluator.cs

@@ -51,60 +51,6 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
 
         public Int32 MaxResultSize { get; set; } = 10 * 1024 * 1024; // 10 mb
 
-        public DictionaryContextData EvaluateStepScopeInputs(
-            TemplateToken token,
-            DictionaryContextData contextData,
-            IList<IFunctionInfo> expressionFunctions)
-        {
-            var result = default(DictionaryContextData);
-
-            if (token != null && token.Type != TokenType.Null)
-            {
-                var context = CreateContext(contextData, expressionFunctions);
-                try
-                {
-                    token = TemplateEvaluator.Evaluate(context, PipelineTemplateConstants.StepsScopeInputs, token, 0, null, omitHeader: true);
-                    context.Errors.Check();
-                    result = token.ToContextData().AssertDictionary("steps scope inputs");
-                }
-                catch (Exception ex) when (!(ex is TemplateValidationException))
-                {
-                    context.Errors.Add(ex);
-                }
-
-                context.Errors.Check();
-            }
-
-            return result ?? new DictionaryContextData();
-        }
-
-        public DictionaryContextData EvaluateStepScopeOutputs(
-            TemplateToken token,
-            DictionaryContextData contextData,
-            IList<IFunctionInfo> expressionFunctions)
-        {
-            var result = default(DictionaryContextData);
-
-            if (token != null && token.Type != TokenType.Null)
-            {
-                var context = CreateContext(contextData, expressionFunctions);
-                try
-                {
-                    token = TemplateEvaluator.Evaluate(context, PipelineTemplateConstants.StepsScopeOutputs, token, 0, null, omitHeader: true);
-                    context.Errors.Check();
-                    result = token.ToContextData().AssertDictionary("steps scope outputs");
-                }
-                catch (Exception ex) when (!(ex is TemplateValidationException))
-                {
-                    context.Errors.Add(ex);
-                }
-
-                context.Errors.Check();
-            }
-
-            return result ?? new DictionaryContextData();
-        }
-
         public Boolean EvaluateStepContinueOnError(
             TemplateToken token,
             DictionaryContextData contextData,
@@ -159,31 +105,6 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
             return result;
         }
 
-        public List<ActionStep> LoadCompositeSteps(
-            TemplateToken token)
-        {
-            var result = default(List<ActionStep>);
-            if (token != null && token.Type != TokenType.Null)
-            {
-                var context = CreateContext(null, null, setMissingContext: false);
-                // TODO: we might want to to have a bool to prevent it from filling in with missing context w/ dummy variables
-                try
-                {
-                    token = TemplateEvaluator.Evaluate(context, PipelineTemplateConstants.StepsInTemplate, token, 0, null, omitHeader: true);
-                    context.Errors.Check();
-                    result = PipelineTemplateConverter.ConvertToSteps(context, token);
-                }
-                catch (Exception ex) when (!(ex is TemplateValidationException))
-                {
-                    context.Errors.Add(ex);
-                }
-
-                context.Errors.Check();
-            }
-            return result;
-        }
-
-
         public Dictionary<String, String> EvaluateStepEnvironment(
             TemplateToken token,
             DictionaryContextData contextData,
@@ -425,8 +346,7 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
         private TemplateContext CreateContext(
             DictionaryContextData contextData,
             IList<IFunctionInfo> expressionFunctions,
-            IEnumerable<KeyValuePair<String, Object>> expressionState = null,
-            bool setMissingContext = true)
+            IEnumerable<KeyValuePair<String, Object>> expressionState = null)
         {
             var result = new TemplateContext
             {
@@ -475,21 +395,18 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
             //   - Evaluating early when all referenced contexts are available, even though all allowed
             //     contexts may not yet be available. For example, evaluating step display name can often
             //     be performed early.
-            if (setMissingContext)
+            foreach (var name in s_expressionValueNames)
             {
-                foreach (var name in s_expressionValueNames)
+                if (!result.ExpressionValues.ContainsKey(name))
                 {
-                    if (!result.ExpressionValues.ContainsKey(name))
-                    {
-                        result.ExpressionValues[name] = null;
-                    }
+                    result.ExpressionValues[name] = null;
                 }
-                foreach (var name in s_expressionFunctionNames)
+            }
+            foreach (var name in s_expressionFunctionNames)
+            {
+                if (!functionNames.Contains(name))
                 {
-                    if (!functionNames.Contains(name))
-                    {
-                        result.ExpressionFunctions.Add(new FunctionInfo<NoOperation>(name, 0, Int32.MaxValue));
-                    }
+                    result.ExpressionFunctions.Add(new FunctionInfo<NoOperation>(name, 0, Int32.MaxValue));
                 }
             }
 

src/Sdk/DTPipelines/Pipelines/ObjectTemplating/ReferenceNameBuilder.cs

@@ -0,0 +1,121 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Text;
+using GitHub.DistributedTask.Pipelines.Validation;
+
+namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
+{
+    internal sealed class ReferenceNameBuilder
+    {
+        internal void AppendSegment(String value)
+        {
+            if (String.IsNullOrEmpty(value))
+            {
+                return;
+            }
+
+            if (m_name.Length == 0)
+            {
+                var first = value[0];
+                if ((first >= 'a' && first <= 'z') ||
+                    (first >= 'A' && first <= 'Z') ||
+                    first == '_')
+                {
+                    // Legal first char
+                }
+                else if ((first >= '0' && first <= '9') || first == '-')
+                {
+                    // Illegal first char, but legal char.
+                    // Prepend "_".
+                    m_name.Append("_");
+                }
+                else
+                {
+                    // Illegal char
+                }
+            }
+            else
+            {
+                // Separator
+                m_name.Append(c_separator);
+            }
+
+            foreach (var c in value)
+            {
+                if ((c >= 'a' && c <= 'z') ||
+                    (c >= 'A' && c <= 'Z') ||
+                    (c >= '0' && c <= '9') ||
+                    c == '_' ||
+                    c == '-')
+                {
+                    // Legal
+                    m_name.Append(c);
+                }
+                else
+                {
+                    // Illegal
+                    m_name.Append("_");
+                }
+            }
+        }
+
+        internal String Build()
+        {
+            var original = m_name.Length > 0 ? m_name.ToString() : "job";
+
+            var attempt = 1;
+            var suffix = default(String);
+            while (true)
+            {
+                if (attempt == 1)
+                {
+                    suffix = String.Empty;
+                }
+                else if (attempt < 1000)
+                {
+                    suffix = String.Format(CultureInfo.InvariantCulture, "_{0}", attempt);
+                }
+                else
+                {
+                    throw new InvalidOperationException("Unable to create a unique name");
+                }
+
+                var candidate = original.Substring(0, Math.Min(original.Length, PipelineConstants.MaxNodeNameLength - suffix.Length)) + suffix;
+
+                if (m_distinctNames.Add(candidate))
+                {
+                    m_name.Clear();
+                    return candidate;
+                }
+
+                attempt++;
+            }
+        }
+
+        internal Boolean TryAddKnownName(
+            String value,
+            out String error)
+        {
+            if (!NameValidation.IsValid(value, allowHyphens: true) && value.Length < PipelineConstants.MaxNodeNameLength)
+            {
+                error = $"The identifier '{value}' is invalid. IDs may only contain alphanumeric characters, '_', and '-'. IDs must start with a letter or '_' and and must be less than {PipelineConstants.MaxNodeNameLength} characters.";
+                return false;
+            }
+            else if (!m_distinctNames.Add(value))
+            {
+                error = $"The identifier '{value}' may not be used more than once within the same scope.";
+                return false;
+            }
+            else
+            {
+                error = null;
+                return true;
+            }
+        }
+
+        private const String c_separator = "_";
+        private readonly HashSet<String> m_distinctNames = new HashSet<String>(StringComparer.OrdinalIgnoreCase);
+        private readonly StringBuilder m_name = new StringBuilder();
+    }
+}

src/Sdk/DTPipelines/workflow-v1.0.json

@@ -16,116 +16,6 @@
       }
     },
 
-    "steps-template-root": {
-      "description": "Steps template file",
-      "mapping": {
-        "properties": {
-          "inputs": "steps-template-inputs",
-          "outputs": "steps-template-outputs",
-          "steps": "steps-in-template"
-        }
-      }
-    },
-
-    "steps-scope-inputs": {
-      "description": "Used when evaluating steps scope inputs",
-      "mapping": {
-        "loose-key-type": "non-empty-string",
-        "loose-value-type": "steps-scope-input-value"
-      }
-    },
-
-    "steps-scope-input-value": {
-      "context": [
-        "github",
-        "needs",
-        "strategy",
-        "matrix",
-        "secrets",
-        "steps",
-        "inputs",
-        "job",
-        "runner",
-        "env"
-      ],
-      "one-of": [
-        "string",
-        "sequence",
-        "mapping"
-      ]
-    },
-
-    "steps-scope-outputs": {
-      "description": "Used when evaluating steps scope outputs",
-      "mapping": {
-        "loose-key-type": "non-empty-string",
-        "loose-value-type": "steps-scope-output-value"
-      }
-    },
-
-    "steps-scope-output-value": {
-      "context": [
-        "github",
-        "needs",
-        "strategy",
-        "matrix",
-        "secrets",
-        "steps",
-        "inputs",
-        "job",
-        "runner",
-        "env"
-      ],
-      "string": {}
-    },
-
-    "steps-template-inputs": {
-      "description": "Allowed inputs in a steps template",
-      "mapping": {
-        "loose-key-type": "non-empty-string",
-        "loose-value-type": "steps-template-input-value"
-      }
-    },
-
-    "steps-template-input-value": {
-      "description": "Default input values for a steps template",
-      "context": [
-        "github",
-        "needs",
-        "strategy",
-        "matrix"
-      ],
-      "one-of": [
-        "string",
-        "sequence",
-        "mapping"
-      ]
-    },
-
-    "steps-template-outputs": {
-      "description": "Output mapping for a steps template",
-      "mapping": {
-        "loose-key-type": "non-empty-string",
-        "loose-value-type": "steps-template-output-value"
-      }
-    },
-
-    "steps-template-output-value": {
-      "description": "Output values for a steps template",
-      "context": [
-        "github",
-        "needs",
-        "strategy",
-        "matrix",
-        "secrets",
-        "steps",
-        "job",
-        "runner",
-        "env"
-      ],
-      "string": {}
-    },
-
     "workflow-defaults": {
       "mapping": {
         "properties": {
@@ -240,54 +130,27 @@
     "matrix": {
       "mapping": {
         "properties": {
-          "include": "matrix-include",
-          "exclude": "matrix-exclude"
+          "include": "matrix-filter",
+          "exclude": "matrix-filter"
         },
         "loose-key-type": "non-empty-string",
         "loose-value-type": "sequence"
       }
     },
 
-    "matrix-include": {
+    "matrix-filter": {
       "sequence": {
-        "item-type": "matrix-include-item"
+        "item-type": "matrix-filter-item"
       }
     },
 
-    "matrix-include-item": {
+    "matrix-filter-item": {
       "mapping": {
         "loose-key-type": "non-empty-string",
         "loose-value-type": "any"
       }
     },
 
-    "matrix-exclude": {
-      "sequence": {
-        "item-type": "matrix-exclude-item"
-      }
-    },
-
-    "matrix-exclude-item": {
-      "mapping": {
-        "loose-key-type": "non-empty-string",
-        "loose-value-type": "matrix-exclude-filter-item"
-      }
-    },
-
-    "matrix-exclude-filter-item": {
-      "one-of": [
-        "string",
-        "matrix-exclude-mapping-filter"
-      ]
-    },
-
-    "matrix-exclude-mapping-filter": {
-      "mapping": {
-        "loose-key-type": "non-empty-string",
-        "loose-value-type": "matrix-exclude-filter-item"
-      }
-    },
-
     "runs-on": {
       "context": [
         "github",
@@ -364,25 +227,10 @@
       }
     },
 
-    "steps-in-template": {
-      "sequence": {
-        "item-type": "steps-item-in-template"
-      }
-    },
-
     "steps-item": {
       "one-of": [
         "run-step",
-        "regular-step",
-        "steps-template-reference"
-      ]
-    },
-
-    "steps-item-in-template": {
-      "one-of": [
-        "run-step-in-template",
-        "regular-step-in-template",
-        "steps-template-reference-in-template"
+        "regular-step"
       ]
     },
 
@@ -405,25 +253,6 @@
       }
     },
 
-    "run-step-in-template": {
-      "mapping": {
-        "properties": {
-          "name": "string-steps-context-in-template",
-          "id": "non-empty-string",
-          "if": "step-if-in-template",
-          "timeout-minutes": "number-steps-context-in-template",
-          "run": {
-            "type": "string-steps-context-in-template",
-            "required": true
-          },
-          "continue-on-error": "boolean-steps-context-in-template",
-          "env": "step-env-in-template",
-          "working-directory": "string-steps-context-in-template",
-          "shell": "non-empty-string"
-        }
-      }
-    },
-
     "regular-step": {
       "mapping": {
         "properties": {
@@ -442,24 +271,6 @@
       }
     },
 
-    "regular-step-in-template": {
-      "mapping": {
-        "properties": {
-          "name": "string-steps-context-in-template",
-          "id": "non-empty-string",
-          "if": "step-if-in-template",
-          "continue-on-error": "boolean-steps-context-in-template",
-          "timeout-minutes": "number-steps-context-in-template",
-          "uses": {
-            "type": "non-empty-string",
-            "required": true
-          },
-          "with": "step-with-in-template",
-          "env": "step-env-in-template"
-        }
-      }
-    },
-
     "step-if": {
       "context": [
         "github",
@@ -479,26 +290,6 @@
       "string": {}
     },
 
-    "step-if-in-template": {
-      "context": [
-        "github",
-        "needs",
-        "strategy",
-        "matrix",
-        "steps",
-        "inputs",
-        "job",
-        "runner",
-        "env",
-        "always(0,0)",
-        "failure(0,0)",
-        "cancelled(0,0)",
-        "success(0,0)",
-        "hashFiles(1,255)"
-      ],
-      "string": {}
-    },
-
     "step-if-result": {
       "context": [
         "github",
@@ -524,89 +315,6 @@
       ]
     },
 
-    "step-if-result-in-template": {
-      "context": [
-        "github",
-        "strategy",
-        "matrix",
-        "steps",
-        "inputs",
-        "job",
-        "runner",
-        "env",
-        "always(0,0)",
-        "failure(0,0)",
-        "cancelled(0,0)",
-        "success(0,0)",
-        "hashFiles(1,255)"
-      ],
-      "one-of": [
-        "null",
-        "boolean",
-        "number",
-        "string",
-        "sequence",
-        "mapping"
-      ]
-    },
-
-    "steps-template-reference": {
-      "mapping": {
-        "properties": {
-          "template": "non-empty-string",
-          "id": "non-empty-string",
-          "inputs": "steps-template-reference-inputs"
-        }
-      }
-    },
-
-    "steps-template-reference-in-template": {
-      "mapping": {
-        "properties": {
-          "template": "non-empty-string",
-          "id": "non-empty-string",
-          "inputs": "steps-template-reference-inputs-in-template"
-        }
-      }
-    },
-
-    "steps-template-reference-inputs": {
-      "context": [
-        "github",
-        "needs",
-        "strategy",
-        "matrix",
-        "secrets",
-        "steps",
-        "job",
-        "runner",
-        "env"
-      ],
-      "mapping": {
-        "loose-key-type": "non-empty-string",
-        "loose-value-type": "string"
-      }
-    },
-
-    "steps-template-reference-inputs-in-template": {
-      "context": [
-        "github",
-        "needs",
-        "strategy",
-        "matrix",
-        "secrets",
-        "steps",
-        "inputs",
-        "job",
-        "runner",
-        "env"
-      ],
-      "mapping": {
-        "loose-key-type": "non-empty-string",
-        "loose-value-type": "string"
-      }
-    },
-
     "step-env": {
       "context": [
         "github",
@@ -626,26 +334,6 @@
       }
     },
 
-    "step-env-in-template": {
-      "context": [
-        "github",
-        "needs",
-        "strategy",
-        "matrix",
-        "secrets",
-        "steps",
-        "inputs",
-        "job",
-        "runner",
-        "env",
-        "hashFiles(1,255)"
-      ],
-      "mapping": {
-        "loose-key-type": "non-empty-string",
-        "loose-value-type": "string"
-      }
-    },
-
     "step-with": {
       "context": [
         "github",
@@ -665,26 +353,6 @@
       }
     },
 
-    "step-with-in-template": {
-      "context": [
-        "github",
-        "needs",
-        "strategy",
-        "matrix",
-        "secrets",
-        "steps",
-        "inputs",
-        "job",
-        "runner",
-        "env",
-        "hashFiles(1,255)"
-      ],
-      "mapping": {
-        "loose-key-type": "non-empty-string",
-        "loose-value-type": "string"
-      }
-    },
-
     "container": {
       "context": [
         "github",
@@ -801,23 +469,6 @@
       "boolean": {}
     },
 
-    "boolean-steps-context-in-template": {
-      "context": [
-        "github",
-        "needs",
-        "strategy",
-        "matrix",
-        "secrets",
-        "steps",
-        "inputs",
-        "job",
-        "runner",
-        "env",
-        "hashFiles(1,255)"
-      ],
-      "boolean": {}
-    },
-
     "number-steps-context": {
       "context": [
         "github",
@@ -834,23 +485,6 @@
       "number": {}
     },
 
-    "number-steps-context-in-template": {
-      "context": [
-        "github",
-        "needs",
-        "strategy",
-        "matrix",
-        "secrets",
-        "steps",
-        "inputs",
-        "job",
-        "runner",
-        "env",
-        "hashFiles(1,255)"
-      ],
-      "number": {}
-    },
-
     "string-runner-context": {
       "context": [
         "github",
@@ -880,23 +514,6 @@
         "hashFiles(1,255)"
       ],
       "string": {}
-    },
-
-    "string-steps-context-in-template": {
-      "context": [
-        "github",
-        "needs",
-        "strategy",
-        "matrix",
-        "secrets",
-        "steps",
-        "inputs",
-        "job",
-        "runner",
-        "env",
-        "hashFiles(1,255)"
-      ],
-      "string": {}
     }
   }
 }

src/Sdk/DTWebApi/WebApi/TaskAgentPoolReference.cs

@@ -29,6 +29,7 @@ namespace GitHub.DistributedTask.WebApi
             this.PoolType = referenceToBeCloned.PoolType;
             this.Size = referenceToBeCloned.Size;
             this.IsLegacy = referenceToBeCloned.IsLegacy;
+            this.IsInternal = referenceToBeCloned.IsInternal;
         }
 
         public TaskAgentPoolReference Clone()
@@ -67,6 +68,16 @@ namespace GitHub.DistributedTask.WebApi
             set;
         }
 
+        /// <summary>
+        /// Gets or sets a value indicating whether or not this pool is internal and can't be modified by users
+        /// </summary>
+        [DataMember]
+        public bool IsInternal
+        {
+            get;
+            set;
+        }
+
         /// <summary>
         /// Gets or sets the type of the pool
         /// </summary>

src/Sdk/DTWebApi/WebApi/TaskHttpClient.cs

@@ -50,7 +50,7 @@ namespace GitHub.DistributedTask.WebApi
             : base(baseUrl, pipeline, disposeHandler)
         {
         }
-
+        
         public Task AppendTimelineRecordFeedAsync(
             Guid scopeIdentifier,
             String planType,
@@ -91,6 +91,28 @@ namespace GitHub.DistributedTask.WebApi
                                                  userState,
                                                  cancellationToken);
         }
+        
+        public Task AppendTimelineRecordFeedAsync(
+            Guid scopeIdentifier,
+            String planType,
+            Guid planId,
+            Guid timelineId,
+            Guid recordId,
+            Guid stepId,
+            IList<String> lines,
+            long startLine,
+            CancellationToken cancellationToken = default(CancellationToken),
+            Object userState = null)
+        {
+            return AppendTimelineRecordFeedAsync(scopeIdentifier,
+                                                 planType,
+                                                 planId,
+                                                 timelineId,
+                                                 recordId,
+                                                 new TimelineRecordFeedLinesWrapper(stepId, lines, startLine),
+                                                 userState,
+                                                 cancellationToken);
+        }
 
         public async Task RaisePlanEventAsync<T>(
             Guid scopeIdentifier,

src/Sdk/DTWebApi/WebApi/TimelineRecordFeedLinesWrapper.cs

@@ -20,6 +20,12 @@ namespace GitHub.DistributedTask.WebApi
             this.Count = lines.Count;
         }
 
+        public TimelineRecordFeedLinesWrapper(Guid stepId, IList<string> lines, Int64 startLine)
+            : this(stepId, lines)
+        {
+            this.StartLine = startLine;
+        }
+
         [DataMember(Order = 0)]
         public Int32 Count { get; private set; }
 
@@ -31,5 +37,8 @@ namespace GitHub.DistributedTask.WebApi
 
         [DataMember(EmitDefaultValue = false)]
         public Guid StepId { get; set; }
+
+        [DataMember (EmitDefaultValue = false)]
+        public Int64? StartLine { get; private set; }
     }
 }

src/Sdk/DTWebApi/WebApi/TimelineRecordLogLine.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Runtime.Serialization;
+
+namespace GitHub.DistributedTask.WebApi
+{
+    [DataContract]
+    public sealed class TimelineRecordLogLine
+    {
+        public TimelineRecordLogLine(String line, long? lineNumber)
+        {
+            this.Line = line;
+            this.LineNumber = lineNumber;
+        }
+
+        [DataMember]
+        public String Line
+        {
+            get;
+            set;
+        }
+
+        [DataMember (EmitDefaultValue = false)]
+        public long? LineNumber
+        {
+            get;
+            set;
+        }
+    }
+}

src/Test/L0/Listener/Configuration/ConfigurationManagerL0.cs

@@ -39,10 +39,12 @@ namespace GitHub.Runner.Common.Tests.Listener.Configuration
         private string _expectedToken = "expectedToken";
         private string _expectedServerUrl = "https://codedev.ms";
         private string _expectedAgentName = "expectedAgentName";
-        private string _expectedPoolName = "poolName";
+        private string _defaultRunnerGroupName = "defaultRunnerGroup";
+        private string _secondRunnerGroupName = "secondRunnerGroup";
         private string _expectedAuthType = "pat";
         private string _expectedWorkFolder = "_work";
-        private int _expectedPoolId = 1;
+        private int _defaultRunnerGroupId = 1;
+        private int _secondRunnerGroupId = 2;
         private RSACryptoServiceProvider rsa = null;
         private RunnerSettings _configMgrAgentSettings = new RunnerSettings();
 
@@ -97,7 +99,7 @@ namespace GitHub.Runner.Common.Tests.Listener.Configuration
             _serviceControlManager.Setup(x => x.GenerateScripts(It.IsAny<RunnerSettings>()));
 #endif
 
-            var expectedPools = new List<TaskAgentPool>() { new TaskAgentPool(_expectedPoolName) { Id = _expectedPoolId } };
+            var expectedPools = new List<TaskAgentPool>() { new TaskAgentPool(_defaultRunnerGroupName) { Id = _defaultRunnerGroupId, IsInternal = true }, new TaskAgentPool(_secondRunnerGroupName) { Id = _secondRunnerGroupId } };
             _runnerServer.Setup(x => x.GetAgentPoolsAsync(It.IsAny<string>(), It.IsAny<TaskAgentPoolType>())).Returns(Task.FromResult(expectedPools));
 
             var expectedAgents = new List<TaskAgent>();
@@ -155,7 +157,7 @@ namespace GitHub.Runner.Common.Tests.Listener.Configuration
                        "configure",                
                        "--url", _expectedServerUrl,
                        "--name", _expectedAgentName,
-                       "--pool", _expectedPoolName,
+                       "--runnergroup", _secondRunnerGroupName,
                        "--work", _expectedWorkFolder,
                        "--auth", _expectedAuthType,
                        "--token", _expectedToken,
@@ -175,7 +177,7 @@ namespace GitHub.Runner.Common.Tests.Listener.Configuration
                 Assert.NotNull(s);
                 Assert.True(s.ServerUrl.Equals(_expectedServerUrl));
                 Assert.True(s.AgentName.Equals(_expectedAgentName));
-                Assert.True(s.PoolId.Equals(_expectedPoolId));
+                Assert.True(s.PoolId.Equals(_secondRunnerGroupId));
                 Assert.True(s.WorkFolder.Equals(_expectedWorkFolder));
 
                 // validate GetAgentPoolsAsync gets called twice with automation pool type

src/Test/L0/Listener/JobDispatcherL0.cs

@@ -33,7 +33,7 @@ namespace GitHub.Runner.Common.Tests.Listener
             TaskOrchestrationPlanReference plan = new TaskOrchestrationPlanReference();
             TimelineReference timeline = null;
             Guid jobId = Guid.NewGuid();
-            var result = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, "someJob", "someJob", null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null, null);
+            var result = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, "someJob", "someJob", null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null);
             result.ContextData["github"] = new Pipelines.ContextData.DictionaryContextData();
             return result;
         }

src/Test/L0/Listener/RunnerL0.cs

@@ -43,7 +43,7 @@ namespace GitHub.Runner.Common.Tests.Listener
             TaskOrchestrationPlanReference plan = new TaskOrchestrationPlanReference();
             TimelineReference timeline = null;
             Guid jobId = Guid.NewGuid();
-            return new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, "test", "test", null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null, null);
+            return new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, "test", "test", null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null);
         }
 
         private JobCancelMessage CreateJobCancelMessage()

src/Test/L0/ServiceInterfacesL0.cs

@@ -60,6 +60,7 @@ namespace GitHub.Runner.Common.Tests
             {
                 typeof(IActionCommandExtension),
                 typeof(IExecutionContext),
+                typeof(IFileCommandExtension),
                 typeof(IHandler),
                 typeof(IJobExtension),
                 typeof(IStep),

src/Test/L0/Worker/ActionCommandManagerL0.cs

@@ -96,7 +96,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                        hc.GetTrace().Info($"{issue.Type} {issue.Message} {message ?? string.Empty}");
                    });
 
-                _ec.Setup(x => x.EnvironmentVariables).Returns(new Dictionary<string, string>());
+                _ec.Object.Global.EnvironmentVariables = new Dictionary<string, string>();
 
                 Assert.True(_commandManager.TryProcessCommand(_ec.Object, "##[stop-commands]stopToken", null));
                 Assert.False(_commandManager.TryProcessCommand(_ec.Object, "##[set-env name=foo]bar", null));
@@ -119,8 +119,6 @@ namespace GitHub.Runner.Common.Tests.Worker
                                 return 1;
                             });
 
-                _ec.SetupAllProperties();
-
                 Assert.False(_ec.Object.EchoOnActionCommand);
 
                 Assert.True(_commandManager.TryProcessCommand(_ec.Object, "::echo::on", null));
@@ -150,7 +148,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 TimelineReference timeline = new TimelineReference();
                 Guid jobId = Guid.NewGuid();
                 string jobName = "some job name";
-                var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, jobName, jobName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null, null);
+                var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, jobName, jobName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null);
                 jobRequest.Resources.Repositories.Add(new Pipelines.RepositoryResource()
                 {
                     Alias = Pipelines.PipelineConstants.SelfAlias,
@@ -204,8 +202,6 @@ namespace GitHub.Runner.Common.Tests.Worker
                                 return 1;
                             });
 
-                _ec.SetupAllProperties();
-
                 // Echo commands below are considered "processed", but are invalid
                 // 1. Invalid echo value
                 Assert.True(_commandManager.TryProcessCommand(_ec.Object, "::echo::invalid", null));
@@ -287,6 +283,8 @@ namespace GitHub.Runner.Common.Tests.Worker
 
             // Execution context
             _ec = new Mock<IExecutionContext>();
+            _ec.SetupAllProperties();
+            _ec.Setup(x => x.Global).Returns(new GlobalContext());
 
             // Command manager
             _commandManager = new ActionCommandManager();

src/Test/L0/Worker/ActionManagerL0.cs

@@ -133,7 +133,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                         Reference = new Pipelines.RepositoryPathReference()
                         {
                             Name = ActionName,
-                            Ref = "master",
+                            Ref = "main",
                             RepositoryType = "GitHub"
                         }
                     }
@@ -141,7 +141,7 @@ namespace GitHub.Runner.Common.Tests.Worker
 
                 // Return a valid action from GHES via mock
                 const string ApiUrl = "https://ghes.example.com/api/v3";
-                string expectedArchiveLink = GetLinkToActionArchive(ApiUrl, ActionName, "master");
+                string expectedArchiveLink = GetLinkToActionArchive(ApiUrl, ActionName, "main");
                 string archiveFile = await CreateRepoArchive();
                 using var stream = File.OpenRead(archiveFile);
                 var mockClientHandler = new Mock<HttpClientHandler>();
@@ -159,10 +159,10 @@ namespace GitHub.Runner.Common.Tests.Worker
                 await _actionManager.PrepareActionsAsync(_ec.Object, actions);
 
                 //Assert
-                var watermarkFile = Path.Combine(_hc.GetDirectory(WellKnownDirectory.Actions), ActionName, "master.completed");
+                var watermarkFile = Path.Combine(_hc.GetDirectory(WellKnownDirectory.Actions), ActionName, "main.completed");
                 Assert.True(File.Exists(watermarkFile));
 
-                var actionYamlFile = Path.Combine(_hc.GetDirectory(WellKnownDirectory.Actions), ActionName, "master", "action.yml");
+                var actionYamlFile = Path.Combine(_hc.GetDirectory(WellKnownDirectory.Actions), ActionName, "main", "action.yml");
                 Assert.True(File.Exists(actionYamlFile));
                 _hc.GetTrace().Info(File.ReadAllText(actionYamlFile));
             }
@@ -191,7 +191,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                         Reference = new Pipelines.RepositoryPathReference()
                         {
                             Name = ActionName,
-                            Ref = "master",
+                            Ref = "main",
                             RepositoryType = "GitHub"
                         }
                     }
@@ -199,8 +199,8 @@ namespace GitHub.Runner.Common.Tests.Worker
 
                 // Return a valid action from GHES via mock
                 const string ApiUrl = "https://ghes.example.com/api/v3";
-                string builtInArchiveLink = GetLinkToActionArchive(ApiUrl, ActionName, "master");
-                string dotcomArchiveLink = GetLinkToActionArchive("https://api.github.com", ActionName, "master");
+                string builtInArchiveLink = GetLinkToActionArchive(ApiUrl, ActionName, "main");
+                string dotcomArchiveLink = GetLinkToActionArchive("https://api.github.com", ActionName, "main");
                 string archiveFile = await CreateRepoArchive();
                 using var stream = File.OpenRead(archiveFile);
                 var mockClientHandler = new Mock<HttpClientHandler>();
@@ -220,10 +220,10 @@ namespace GitHub.Runner.Common.Tests.Worker
                 await _actionManager.PrepareActionsAsync(_ec.Object, actions);
 
                 //Assert
-                var watermarkFile = Path.Combine(_hc.GetDirectory(WellKnownDirectory.Actions), ActionName, "master.completed");
+                var watermarkFile = Path.Combine(_hc.GetDirectory(WellKnownDirectory.Actions), ActionName, "main.completed");
                 Assert.True(File.Exists(watermarkFile));
 
-                var actionYamlFile = Path.Combine(_hc.GetDirectory(WellKnownDirectory.Actions), ActionName, "master", "action.yml");
+                var actionYamlFile = Path.Combine(_hc.GetDirectory(WellKnownDirectory.Actions), ActionName, "main", "action.yml");
                 Assert.True(File.Exists(actionYamlFile));
                 _hc.GetTrace().Info(File.ReadAllText(actionYamlFile));
             }
@@ -252,7 +252,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                         Reference = new Pipelines.RepositoryPathReference()
                         {
                             Name = ActionName,
-                            Ref = "master",
+                            Ref = "main",
                             RepositoryType = "GitHub"
                         }
                     }
@@ -260,7 +260,7 @@ namespace GitHub.Runner.Common.Tests.Worker
 
                 // Return a valid action from GHES via mock
                 const string ApiUrl = "https://ghes.example.com/api/v3";
-                string archiveLink = GetLinkToActionArchive(ApiUrl, ActionName, "master");
+                string archiveLink = GetLinkToActionArchive(ApiUrl, ActionName, "main");
                 string archiveFile = await CreateRepoArchive();
                 using var stream = File.OpenRead(archiveFile);
                 var mockClientHandler = new Mock<HttpClientHandler>();
@@ -280,10 +280,10 @@ namespace GitHub.Runner.Common.Tests.Worker
                 //Assert
                 await Assert.ThrowsAsync<ActionNotFoundException>(action);
 
-                var watermarkFile = Path.Combine(_hc.GetDirectory(WellKnownDirectory.Actions), ActionName, "master.completed");
+                var watermarkFile = Path.Combine(_hc.GetDirectory(WellKnownDirectory.Actions), ActionName, "main.completed");
                 Assert.False(File.Exists(watermarkFile));
 
-                var actionYamlFile = Path.Combine(_hc.GetDirectory(WellKnownDirectory.Actions), ActionName, "master", "action.yml");
+                var actionYamlFile = Path.Combine(_hc.GetDirectory(WellKnownDirectory.Actions), ActionName, "main", "action.yml");
                 Assert.False(File.Exists(actionYamlFile));
             }
             finally
@@ -846,7 +846,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 {
                     var traceFile = Path.GetTempFileName();
                     File.Copy(_hc.TraceFileName, traceFile, true);
-                    Assert.Contains("Entry javascript file is not provided.", File.ReadAllText(traceFile));
+                    Assert.Contains("You are using a JavaScript Action but there is not an entry JavaScript file provided in", File.ReadAllText(traceFile));
                 }
             }
             finally
@@ -1278,7 +1278,7 @@ runs:
 ";
                 Pipelines.ActionStep instance;
                 string directory;
-                directory = Path.Combine(_workFolder, Constants.Path.ActionsDirectory, "GitHub/actions".Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar), "master");
+                directory = Path.Combine(_workFolder, Constants.Path.ActionsDirectory, "GitHub/actions".Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar), "main");
                 string file = Path.Combine(directory, Constants.Path.ActionManifestYamlFile);
                 Directory.CreateDirectory(Path.GetDirectoryName(file));
                 File.WriteAllText(file, Content);
@@ -1288,7 +1288,7 @@ runs:
                     Reference = new Pipelines.RepositoryPathReference()
                     {
                         Name = "GitHub/actions",
-                        Ref = "master",
+                        Ref = "main",
                         RepositoryType = Pipelines.RepositoryTypes.GitHub
                     }
                 };
@@ -2466,7 +2466,7 @@ runs:
                 {
                     var traceFile = Path.GetTempFileName();
                     File.Copy(_hc.TraceFileName, traceFile, true);
-                    Assert.Contains("Entry javascript file is not provided.", File.ReadAllText(traceFile));
+                    Assert.Contains("You are using a JavaScript Action but there is not an entry JavaScript file provided in", File.ReadAllText(traceFile));
                 }
             }
             finally
@@ -2898,7 +2898,7 @@ runs:
 ";
                 Pipelines.ActionStep instance;
                 string directory;
-                directory = Path.Combine(_workFolder, Constants.Path.ActionsDirectory, "GitHub/actions".Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar), "master");
+                directory = Path.Combine(_workFolder, Constants.Path.ActionsDirectory, "GitHub/actions".Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar), "main");
                 string file = Path.Combine(directory, Constants.Path.ActionManifestYamlFile);
                 Directory.CreateDirectory(Path.GetDirectoryName(file));
                 File.WriteAllText(file, Content);
@@ -2908,7 +2908,7 @@ runs:
                     Reference = new Pipelines.RepositoryPathReference()
                     {
                         Name = "GitHub/actions",
-                        Ref = "master",
+                        Ref = "main",
                         RepositoryType = Pipelines.RepositoryTypes.GitHub
                     }
                 };
@@ -3453,7 +3453,7 @@ runs:
 
         private void CreateAction(string yamlContent, out Pipelines.ActionStep instance, out string directory)
         {
-            directory = Path.Combine(_workFolder, Constants.Path.ActionsDirectory, "GitHub/actions".Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar), "master");
+            directory = Path.Combine(_workFolder, Constants.Path.ActionsDirectory, "GitHub/actions".Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar), "main");
             string file = Path.Combine(directory, Constants.Path.ActionManifestYmlFile);
             Directory.CreateDirectory(Path.GetDirectoryName(file));
             File.WriteAllText(file, yamlContent);
@@ -3463,7 +3463,7 @@ runs:
                 Reference = new Pipelines.RepositoryPathReference()
                 {
                     Name = "GitHub/actions",
-                    Ref = "master",
+                    Ref = "main",
                     RepositoryType = Pipelines.RepositoryTypes.GitHub
                 }
             };
@@ -3481,7 +3481,7 @@ runs:
                 Reference = new Pipelines.RepositoryPathReference()
                 {
                     Name = "GitHub/actions",
-                    Ref = "master",
+                    Ref = "main",
                     RepositoryType = Pipelines.PipelineConstants.SelfAlias
                 }
             };
@@ -3575,17 +3575,18 @@ runs:
             _workFolder = _hc.GetDirectory(WellKnownDirectory.Work);
 
             _ec = new Mock<IExecutionContext>();
+            _ec.Setup(x => x.Global).Returns(new GlobalContext());
             _ec.Setup(x => x.CancellationToken).Returns(_ecTokenSource.Token);
             var variables = new Dictionary<string, VariableValue>();
             if (newActionMetadata)
             {
                 variables["DistributedTask.NewActionMetadata"] = "true";
             }
-            _ec.Setup(x => x.Variables).Returns(new Variables(_hc, variables));
+            _ec.Object.Global.Variables = new Variables(_hc, variables);
             _ec.Setup(x => x.ExpressionValues).Returns(new DictionaryContextData());
             _ec.Setup(x => x.ExpressionFunctions).Returns(new List<IFunctionInfo>());
-            _ec.Setup(x => x.FileTable).Returns(new List<String>());
-            _ec.Setup(x => x.Plan).Returns(new TaskOrchestrationPlanReference());
+            _ec.Object.Global.FileTable = new List<String>();
+            _ec.Object.Global.Plan = new TaskOrchestrationPlanReference();
             _ec.Setup(x => x.Write(It.IsAny<string>(), It.IsAny<string>())).Callback((string tag, string message) => { _hc.GetTrace().Info($"[{tag}]{message}"); });
             _ec.Setup(x => x.AddIssue(It.IsAny<Issue>(), It.IsAny<string>())).Callback((Issue issue, string message) => { _hc.GetTrace().Info($"[{issue.Type}]{issue.Message ?? message}"); });
             _ec.Setup(x => x.GetGitHubContext("workspace")).Returns(Path.Combine(_workFolder, "actions", "actions"));

src/Test/L0/Worker/ActionManifestManagerL0.cs

@@ -717,7 +717,7 @@ namespace GitHub.Runner.Common.Tests.Worker
 
                 _ec.Object.ExpressionValues["github"] = new DictionaryContextData
                 {
-                    { "ref", new StringContextData("refs/heads/master") },
+                    { "ref", new StringContextData("refs/heads/main") },
                 };
                 _ec.Object.ExpressionValues["strategy"] = new DictionaryContextData();
                 _ec.Object.ExpressionValues["matrix"] = new DictionaryContextData();
@@ -737,7 +737,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 result = actionManifest.EvaluateDefaultInput(_ec.Object, "testInput", new BasicExpressionToken(null, null, null, "github.ref"));
 
                 //Assert
-                Assert.Equal("refs/heads/master", result);
+                Assert.Equal("refs/heads/main", result);
             }
             finally
             {
@@ -754,12 +754,16 @@ namespace GitHub.Runner.Common.Tests.Worker
             _hc = new TestHostContext(this, name);
 
             _ec = new Mock<IExecutionContext>();
-            _ec.Setup(x => x.WriteDebug).Returns(true);
+            _ec.Setup(x => x.Global)
+                .Returns(new GlobalContext
+                {
+                    FileTable = new List<String>(),
+                    Variables = new Variables(_hc, new Dictionary<string, VariableValue>()),
+                    WriteDebug = true,
+                });
             _ec.Setup(x => x.CancellationToken).Returns(_ecTokenSource.Token);
-            _ec.Setup(x => x.Variables).Returns(new Variables(_hc, new Dictionary<string, VariableValue>()));
             _ec.Setup(x => x.ExpressionValues).Returns(new DictionaryContextData());
             _ec.Setup(x => x.ExpressionFunctions).Returns(new List<IFunctionInfo>());
-            _ec.Setup(x => x.FileTable).Returns(new List<String>());
             _ec.Setup(x => x.Write(It.IsAny<string>(), It.IsAny<string>())).Callback((string tag, string message) => { _hc.GetTrace().Info($"{tag}{message}"); });
             _ec.Setup(x => x.AddIssue(It.IsAny<Issue>(), It.IsAny<string>())).Callback((Issue issue, string message) => { _hc.GetTrace().Info($"[{issue.Type}]{issue.Message ?? message}"); });
         }

src/Test/L0/Worker/ActionRunnerL0.cs

@@ -32,6 +32,8 @@ namespace GitHub.Runner.Common.Tests.Worker
         private TestHostContext _hc;
         private ActionRunner _actionRunner;
         private IActionManifestManager _actionManifestManager;
+        private Mock<IFileCommandManager> _fileCommandManager;
+
         private DictionaryContextData _context = new DictionaryContextData();
 
         [Fact]
@@ -362,6 +364,7 @@ namespace GitHub.Runner.Common.Tests.Worker
             _handlerFactory = new Mock<IHandlerFactory>();
             _defaultStepHost = new Mock<IDefaultStepHost>();
             _actionManifestManager = new ActionManifestManager();
+            _fileCommandManager = new Mock<IFileCommandManager>();
             _actionManifestManager.Initialize(_hc);
 
             var githubContext = new GitHubContext();
@@ -375,15 +378,16 @@ namespace GitHub.Runner.Common.Tests.Worker
 #endif
 
             _ec = new Mock<IExecutionContext>();
+            _ec.Setup(x => x.Global).Returns(new GlobalContext());
             _ec.Setup(x => x.ExpressionValues).Returns(_context);
             _ec.Setup(x => x.ExpressionFunctions).Returns(new List<IFunctionInfo>());
             _ec.Setup(x => x.IntraActionState).Returns(new Dictionary<string, string>());
-            _ec.Setup(x => x.EnvironmentVariables).Returns(new Dictionary<string, string>());
-            _ec.Setup(x => x.FileTable).Returns(new List<String>());
+            _ec.Object.Global.EnvironmentVariables = new Dictionary<string, string>();
+            _ec.Object.Global.FileTable = new List<String>();
             _ec.Setup(x => x.SetGitHubContext(It.IsAny<string>(), It.IsAny<string>()));
             _ec.Setup(x => x.GetGitHubContext(It.IsAny<string>())).Returns("{\"foo\":\"bar\"}");
             _ec.Setup(x => x.CancellationToken).Returns(_ecTokenSource.Token);
-            _ec.Setup(x => x.Variables).Returns(new Variables(_hc, new Dictionary<string, VariableValue>()));
+            _ec.Object.Global.Variables = new Variables(_hc, new Dictionary<string, VariableValue>());
             _ec.Setup(x => x.Write(It.IsAny<string>(), It.IsAny<string>())).Callback((string tag, string message) => { _hc.GetTrace().Info($"[{tag}]{message}"); });
             _ec.Setup(x => x.AddIssue(It.IsAny<Issue>(), It.IsAny<string>())).Callback((Issue issue, string message) => { _hc.GetTrace().Info($"[{issue.Type}]{issue.Message ?? message}"); });
 
@@ -393,6 +397,8 @@ namespace GitHub.Runner.Common.Tests.Worker
 
             _hc.EnqueueInstance<IDefaultStepHost>(_defaultStepHost.Object);
 
+            _hc.EnqueueInstance(_fileCommandManager.Object);
+
             // Instance to test.
             _actionRunner = new ActionRunner();
             _actionRunner.Initialize(_hc);

src/Test/L0/Worker/ExecutionContextL0.cs

@@ -26,7 +26,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 TimelineReference timeline = new TimelineReference();
                 Guid jobId = Guid.NewGuid();
                 string jobName = "some job name";
-                var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, jobName, jobName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null, null);
+                var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, jobName, jobName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null);
                 jobRequest.Resources.Repositories.Add(new Pipelines.RepositoryResource()
                 {
                     Alias = Pipelines.PipelineConstants.SelfAlias,
@@ -102,7 +102,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 TimelineReference timeline = new TimelineReference();
                 Guid jobId = Guid.NewGuid();
                 string jobName = "some job name";
-                var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, jobName, jobName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null, null);
+                var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, jobName, jobName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null);
                 jobRequest.Resources.Repositories.Add(new Pipelines.RepositoryResource()
                 {
                     Alias = Pipelines.PipelineConstants.SelfAlias,
@@ -116,7 +116,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 var pagingLogger = new Mock<IPagingLogger>();
                 var jobServerQueue = new Mock<IJobServerQueue>();
                 jobServerQueue.Setup(x => x.QueueTimelineRecordUpdate(It.IsAny<Guid>(), It.IsAny<TimelineRecord>()));
-                jobServerQueue.Setup(x => x.QueueWebConsoleLine(It.IsAny<Guid>(), It.IsAny<string>())).Callback((Guid id, string msg) => { hc.GetTrace().Info(msg); });
+                jobServerQueue.Setup(x => x.QueueWebConsoleLine(It.IsAny<Guid>(), It.IsAny<string>(),It.IsAny<long>())).Callback((Guid id, string msg, long? lineNumber) => { hc.GetTrace().Info(msg); });
 
                 hc.EnqueueInstance(pagingLogger.Object);
                 hc.SetSingleton(jobServerQueue.Object);
@@ -137,7 +137,7 @@ namespace GitHub.Runner.Common.Tests.Worker
 
                 ec.Complete();
 
-                jobServerQueue.Verify(x => x.QueueWebConsoleLine(It.IsAny<Guid>(), It.IsAny<string>()), Times.Exactly(10));
+                jobServerQueue.Verify(x => x.QueueWebConsoleLine(It.IsAny<Guid>(), It.IsAny<string>(), It.IsAny<long?>()), Times.Exactly(10));
             }
         }
 
@@ -153,7 +153,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 TimelineReference timeline = new TimelineReference();
                 Guid jobId = Guid.NewGuid();
                 string jobName = "some job name";
-                var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, jobName, jobName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null, null);
+                var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, jobName, jobName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null);
                 jobRequest.Resources.Repositories.Add(new Pipelines.RepositoryResource()
                 {
                     Alias = Pipelines.PipelineConstants.SelfAlias,
@@ -171,7 +171,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 var pagingLogger5 = new Mock<IPagingLogger>();
                 var jobServerQueue = new Mock<IJobServerQueue>();
                 jobServerQueue.Setup(x => x.QueueTimelineRecordUpdate(It.IsAny<Guid>(), It.IsAny<TimelineRecord>()));
-                jobServerQueue.Setup(x => x.QueueWebConsoleLine(It.IsAny<Guid>(), It.IsAny<string>())).Callback((Guid id, string msg) => { hc.GetTrace().Info(msg); });
+                jobServerQueue.Setup(x => x.QueueWebConsoleLine(It.IsAny<Guid>(), It.IsAny<string>(), It.IsAny<long?>())).Callback((Guid id, string msg, long? lineNumber) => { hc.GetTrace().Info(msg); });
 
                 var actionRunner1 = new ActionRunner();
                 actionRunner1.Initialize(hc);
@@ -251,7 +251,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 TimelineReference timeline = new TimelineReference();
                 Guid jobId = Guid.NewGuid();
                 string jobName = "some job name";
-                var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, jobName, jobName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null, null);
+                var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, jobName, jobName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null);
                 jobRequest.Resources.Repositories.Add(new Pipelines.RepositoryResource()
                 {
                     Alias = Pipelines.PipelineConstants.SelfAlias,
@@ -269,7 +269,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 var pagingLogger5 = new Mock<IPagingLogger>();
                 var jobServerQueue = new Mock<IJobServerQueue>();
                 jobServerQueue.Setup(x => x.QueueTimelineRecordUpdate(It.IsAny<Guid>(), It.IsAny<TimelineRecord>()));
-                jobServerQueue.Setup(x => x.QueueWebConsoleLine(It.IsAny<Guid>(), It.IsAny<string>())).Callback((Guid id, string msg) => { hc.GetTrace().Info(msg); });
+                jobServerQueue.Setup(x => x.QueueWebConsoleLine(It.IsAny<Guid>(), It.IsAny<string>(), It.IsAny<long?>())).Callback((Guid id, string msg, long? lineNumber) => { hc.GetTrace().Info(msg); });
 
                 var actionRunner1 = new ActionRunner();
                 actionRunner1.Initialize(hc);
@@ -335,7 +335,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 TimelineReference timeline = new TimelineReference();
                 Guid jobId = Guid.NewGuid();
                 string jobName = "some job name";
-                var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, jobName, jobName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null, null);
+                var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, jobName, jobName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null);
                 jobRequest.Resources.Repositories.Add(new Pipelines.RepositoryResource()
                 {
                     Alias = Pipelines.PipelineConstants.SelfAlias,
@@ -357,20 +357,20 @@ namespace GitHub.Runner.Common.Tests.Worker
                 // Act.
                 jobContext.InitializeJob(jobRequest, CancellationToken.None);
 
-                jobContext.StepsContext.SetConclusion(null, "step1", ActionResult.Success);
-                var conclusion1 = (jobContext.StepsContext.GetScope(null)["step1"] as DictionaryContextData)["conclusion"].ToString();
+                jobContext.Global.StepsContext.SetConclusion(null, "step1", ActionResult.Success);
+                var conclusion1 = (jobContext.Global.StepsContext.GetScope(null)["step1"] as DictionaryContextData)["conclusion"].ToString();
                 Assert.Equal(conclusion1, conclusion1.ToLowerInvariant());
 
-                jobContext.StepsContext.SetOutcome(null, "step2", ActionResult.Cancelled);
-                var outcome1 = (jobContext.StepsContext.GetScope(null)["step2"] as DictionaryContextData)["outcome"].ToString();
+                jobContext.Global.StepsContext.SetOutcome(null, "step2", ActionResult.Cancelled);
+                var outcome1 = (jobContext.Global.StepsContext.GetScope(null)["step2"] as DictionaryContextData)["outcome"].ToString();
                 Assert.Equal(outcome1, outcome1.ToLowerInvariant());
 
-                jobContext.StepsContext.SetConclusion(null, "step3", ActionResult.Failure);
-                var conclusion2 = (jobContext.StepsContext.GetScope(null)["step3"] as DictionaryContextData)["conclusion"].ToString();
+                jobContext.Global.StepsContext.SetConclusion(null, "step3", ActionResult.Failure);
+                var conclusion2 = (jobContext.Global.StepsContext.GetScope(null)["step3"] as DictionaryContextData)["conclusion"].ToString();
                 Assert.Equal(conclusion2, conclusion2.ToLowerInvariant());
 
-                jobContext.StepsContext.SetOutcome(null, "step4", ActionResult.Skipped);
-                var outcome2 = (jobContext.StepsContext.GetScope(null)["step4"] as DictionaryContextData)["outcome"].ToString();
+                jobContext.Global.StepsContext.SetOutcome(null, "step4", ActionResult.Skipped);
+                var outcome2 = (jobContext.Global.StepsContext.GetScope(null)["step4"] as DictionaryContextData)["outcome"].ToString();
                 Assert.Equal(outcome2, outcome2.ToLowerInvariant());
 
                 jobContext.JobContext.Status = ActionResult.Success;

src/Test/L0/Worker/JobExtensionL0.cs

@@ -98,7 +98,7 @@ namespace GitHub.Runner.Common.Tests.Worker
             };
 
             Guid jobId = Guid.NewGuid();
-            _message = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, "test", "test", null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), steps, null, null, null, null);
+            _message = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, "test", "test", null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), steps, null, null, null);
             GitHubContext github = new GitHubContext();
             github["repository"] = new Pipelines.ContextData.StringContextData("actions/runner");
             _message.ContextData.Add("github", github);

src/Test/L0/Worker/JobRunnerL0.cs

@@ -60,7 +60,7 @@ namespace GitHub.Runner.Common.Tests.Worker
             TaskOrchestrationPlanReference plan = new TaskOrchestrationPlanReference();
             TimelineReference timeline = new Timeline(Guid.NewGuid());
             Guid jobId = Guid.NewGuid();
-            _message = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, testName, testName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null, null);
+            _message = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, testName, testName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null);
             _message.Variables[Constants.Variables.System.Culture] = "en-US";
             _message.Resources.Endpoints.Add(new ServiceEndpoint()
             {

src/Test/L0/Worker/OutputManagerL0.cs

@@ -955,12 +955,13 @@ namespace GitHub.Runner.Common.Tests.Worker
             _variables = new Variables(hostContext, new Dictionary<string, DTWebApi.VariableValue>());
 
             _executionContext = new Mock<IExecutionContext>();
-            _executionContext.Setup(x => x.WriteDebug)
-                .Returns(true);
-            _executionContext.Setup(x => x.Variables)
-                .Returns(_variables);
-            _executionContext.Setup(x => x.Container)
-                .Returns(jobContainer);
+            _executionContext.Setup(x => x.Global)
+                .Returns(new GlobalContext
+                {
+                    Container = jobContainer,
+                    Variables = _variables,
+                    WriteDebug = true,
+                });
             _executionContext.Setup(x => x.GetMatchers())
                 .Returns(matchers?.Matchers ?? new List<IssueMatcherConfig>());
             _executionContext.Setup(x => x.Add(It.IsAny<OnMatcherChanged>()))

src/Test/L0/Worker/PipelineDirectoryManagerL0.cs

@@ -203,6 +203,7 @@ namespace GitHub.Runner.Common.Tests.Worker
 
             // Setup the execution context.
             _ec = new Mock<IExecutionContext>();
+            _ec.Setup(x => x.Global).Returns(new GlobalContext());
 
             GitHubContext githubContext = new GitHubContext();
             _ec.Setup(x => x.GetGitHubContext("repository")).Returns("actions/runner");

src/Test/L0/Worker/SetEnvFileCommandL0.cs

@@ -0,0 +1,390 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Runtime.CompilerServices;
+using GitHub.Runner.Common.Util;
+using GitHub.Runner.Sdk;
+using GitHub.Runner.Worker;
+using GitHub.Runner.Worker.Container;
+using GitHub.Runner.Worker.Handlers;
+using Moq;
+using Xunit;
+using DTWebApi = GitHub.DistributedTask.WebApi;
+
+namespace GitHub.Runner.Common.Tests.Worker
+{
+    public sealed class SetEnvFileCommandL0
+    {
+        private Mock<IExecutionContext> _executionContext;
+        private List<Tuple<DTWebApi.Issue, string>> _issues;
+        private string _rootDirectory;
+        private SetEnvFileCommand _setEnvFileCommand;
+        private ITraceWriter _trace;
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void SetEnvFileCommand_DirectoryNotFound()
+        {
+            using (var hostContext = Setup())
+            {
+                var envFile = Path.Combine(_rootDirectory, "directory-not-found", "env");
+                _setEnvFileCommand.ProcessCommand(_executionContext.Object, envFile, null);
+                Assert.Equal(0, _issues.Count);
+                Assert.Equal(0, _executionContext.Object.Global.EnvironmentVariables.Count);
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void SetEnvFileCommand_NotFound()
+        {
+            using (var hostContext = Setup())
+            {
+                var envFile = Path.Combine(_rootDirectory, "file-not-found");
+                _setEnvFileCommand.ProcessCommand(_executionContext.Object, envFile, null);
+                Assert.Equal(0, _issues.Count);
+                Assert.Equal(0, _executionContext.Object.Global.EnvironmentVariables.Count);
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void SetEnvFileCommand_EmptyFile()
+        {
+            using (var hostContext = Setup())
+            {
+                var envFile = Path.Combine(_rootDirectory, "empty-file");
+                var content = new List<string>();
+                WriteContent(envFile, content);
+                _setEnvFileCommand.ProcessCommand(_executionContext.Object, envFile, null);
+                Assert.Equal(0, _issues.Count);
+                Assert.Equal(0, _executionContext.Object.Global.EnvironmentVariables.Count);
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void SetEnvFileCommand_Simple()
+        {
+            using (var hostContext = Setup())
+            {
+                var envFile = Path.Combine(_rootDirectory, "simple");
+                var content = new List<string>
+                {
+                    "MY_ENV=MY VALUE",
+                };
+                WriteContent(envFile, content);
+                _setEnvFileCommand.ProcessCommand(_executionContext.Object, envFile, null);
+                Assert.Equal(0, _issues.Count);
+                Assert.Equal(1, _executionContext.Object.Global.EnvironmentVariables.Count);
+                Assert.Equal("MY VALUE", _executionContext.Object.Global.EnvironmentVariables["MY_ENV"]);
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void SetEnvFileCommand_Simple_SkipEmptyLines()
+        {
+            using (var hostContext = Setup())
+            {
+                var envFile = Path.Combine(_rootDirectory, "simple");
+                var content = new List<string>
+                {
+                    string.Empty,
+                    "MY_ENV=my value",
+                    string.Empty,
+                    "MY_ENV_2=my second value",
+                    string.Empty,
+                };
+                WriteContent(envFile, content);
+                _setEnvFileCommand.ProcessCommand(_executionContext.Object, envFile, null);
+                Assert.Equal(0, _issues.Count);
+                Assert.Equal(2, _executionContext.Object.Global.EnvironmentVariables.Count);
+                Assert.Equal("my value", _executionContext.Object.Global.EnvironmentVariables["MY_ENV"]);
+                Assert.Equal("my second value", _executionContext.Object.Global.EnvironmentVariables["MY_ENV_2"]);
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void SetEnvFileCommand_Simple_EmptyValue()
+        {
+            using (var hostContext = Setup())
+            {
+                var envFile = Path.Combine(_rootDirectory, "simple-empty-value");
+                var content = new List<string>
+                {
+                    "MY_ENV=",
+                };
+                WriteContent(envFile, content);
+                _setEnvFileCommand.ProcessCommand(_executionContext.Object, envFile, null);
+                Assert.Equal(0, _issues.Count);
+                Assert.Equal(1, _executionContext.Object.Global.EnvironmentVariables.Count);
+                Assert.Equal(string.Empty, _executionContext.Object.Global.EnvironmentVariables["MY_ENV"]);
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void SetEnvFileCommand_Simple_MultipleValues()
+        {
+            using (var hostContext = Setup())
+            {
+                var envFile = Path.Combine(_rootDirectory, "simple");
+                var content = new List<string>
+                {
+                    "MY_ENV=my value",
+                    "MY_ENV_2=",
+                    "MY_ENV_3=my third value",
+                };
+                WriteContent(envFile, content);
+                _setEnvFileCommand.ProcessCommand(_executionContext.Object, envFile, null);
+                Assert.Equal(0, _issues.Count);
+                Assert.Equal(3, _executionContext.Object.Global.EnvironmentVariables.Count);
+                Assert.Equal("my value", _executionContext.Object.Global.EnvironmentVariables["MY_ENV"]);
+                Assert.Equal(string.Empty, _executionContext.Object.Global.EnvironmentVariables["MY_ENV_2"]);
+                Assert.Equal("my third value", _executionContext.Object.Global.EnvironmentVariables["MY_ENV_3"]);
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void SetEnvFileCommand_Simple_SpecialCharacters()
+        {
+            using (var hostContext = Setup())
+            {
+                var envFile = Path.Combine(_rootDirectory, "simple");
+                var content = new List<string>
+                {
+                    "MY_ENV==abc",
+                    "MY_ENV_2=def=ghi",
+                    "MY_ENV_3=jkl=",
+                };
+                WriteContent(envFile, content);
+                _setEnvFileCommand.ProcessCommand(_executionContext.Object, envFile, null);
+                Assert.Equal(0, _issues.Count);
+                Assert.Equal(3, _executionContext.Object.Global.EnvironmentVariables.Count);
+                Assert.Equal("=abc", _executionContext.Object.Global.EnvironmentVariables["MY_ENV"]);
+                Assert.Equal("def=ghi", _executionContext.Object.Global.EnvironmentVariables["MY_ENV_2"]);
+                Assert.Equal("jkl=", _executionContext.Object.Global.EnvironmentVariables["MY_ENV_3"]);
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void SetEnvFileCommand_Heredoc()
+        {
+            using (var hostContext = Setup())
+            {
+                var envFile = Path.Combine(_rootDirectory, "heredoc");
+                var content = new List<string>
+                {
+                    "MY_ENV<<EOF",
+                    "line one",
+                    "line two",
+                    "line three",
+                    "EOF",
+                };
+                WriteContent(envFile, content);
+                _setEnvFileCommand.ProcessCommand(_executionContext.Object, envFile, null);
+                Assert.Equal(0, _issues.Count);
+                Assert.Equal(1, _executionContext.Object.Global.EnvironmentVariables.Count);
+                Assert.Equal($"line one{Environment.NewLine}line two{Environment.NewLine}line three", _executionContext.Object.Global.EnvironmentVariables["MY_ENV"]);
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void SetEnvFileCommand_Heredoc_EmptyValue()
+        {
+            using (var hostContext = Setup())
+            {
+                var envFile = Path.Combine(_rootDirectory, "heredoc");
+                var content = new List<string>
+                {
+                    "MY_ENV<<EOF",
+                    "EOF",
+                };
+                WriteContent(envFile, content);
+                _setEnvFileCommand.ProcessCommand(_executionContext.Object, envFile, null);
+                Assert.Equal(0, _issues.Count);
+                Assert.Equal(1, _executionContext.Object.Global.EnvironmentVariables.Count);
+                Assert.Equal(string.Empty, _executionContext.Object.Global.EnvironmentVariables["MY_ENV"]);
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void SetEnvFileCommand_Heredoc_SkipEmptyLines()
+        {
+            using (var hostContext = Setup())
+            {
+                var envFile = Path.Combine(_rootDirectory, "heredoc");
+                var content = new List<string>
+                {
+                    string.Empty,
+                    "MY_ENV<<EOF",
+                    "hello",
+                    "world",
+                    "EOF",
+                    string.Empty,
+                    "MY_ENV_2<<EOF",
+                    "HELLO",
+                    "AGAIN",
+                    "EOF",
+                    string.Empty,
+                };
+                WriteContent(envFile, content);
+                _setEnvFileCommand.ProcessCommand(_executionContext.Object, envFile, null);
+                Assert.Equal(0, _issues.Count);
+                Assert.Equal(2, _executionContext.Object.Global.EnvironmentVariables.Count);
+                Assert.Equal($"hello{Environment.NewLine}world", _executionContext.Object.Global.EnvironmentVariables["MY_ENV"]);
+                Assert.Equal($"HELLO{Environment.NewLine}AGAIN", _executionContext.Object.Global.EnvironmentVariables["MY_ENV_2"]);
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void SetEnvFileCommand_Heredoc_SpecialCharacters()
+        {
+            using (var hostContext = Setup())
+            {
+                var envFile = Path.Combine(_rootDirectory, "heredoc");
+                var content = new List<string>
+                {
+                    "MY_ENV<<=EOF",
+                    "hello",
+                    "one",
+                    "=EOF",
+                    "MY_ENV_2<<<EOF",
+                    "hello",
+                    "two",
+                    "<EOF",
+                    "MY_ENV_3<<EOF",
+                    "hello",
+                    string.Empty,
+                    "three",
+                    string.Empty,
+                    "EOF",
+                    "MY_ENV_4<<EOF",
+                    "hello=four",
+                    "EOF",
+                    "MY_ENV_5<<EOF",
+                    " EOF",
+                    "EOF",
+                };
+                WriteContent(envFile, content);
+                _setEnvFileCommand.ProcessCommand(_executionContext.Object, envFile, null);
+                Assert.Equal(0, _issues.Count);
+                Assert.Equal(5, _executionContext.Object.Global.EnvironmentVariables.Count);
+                Assert.Equal($"hello{Environment.NewLine}one", _executionContext.Object.Global.EnvironmentVariables["MY_ENV"]);
+                Assert.Equal($"hello{Environment.NewLine}two", _executionContext.Object.Global.EnvironmentVariables["MY_ENV_2"]);
+                Assert.Equal($"hello{Environment.NewLine}{Environment.NewLine}three{Environment.NewLine}", _executionContext.Object.Global.EnvironmentVariables["MY_ENV_3"]);
+                Assert.Equal($"hello=four", _executionContext.Object.Global.EnvironmentVariables["MY_ENV_4"]);
+                Assert.Equal($" EOF", _executionContext.Object.Global.EnvironmentVariables["MY_ENV_5"]);
+            }
+        }
+
+#if OS_WINDOWS
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Worker")]
+        public void SetEnvFileCommand_Heredoc_PreservesNewline()
+        {
+            using (var hostContext = Setup())
+            {
+                var newline = "\n";
+                var envFile = Path.Combine(_rootDirectory, "heredoc");
+                var content = new List<string>
+                {
+                    "MY_ENV<<EOF",
+                    "hello",
+                    "world",
+                    "EOF",
+                };
+                WriteContent(envFile, content, newline: newline);
+                _setEnvFileCommand.ProcessCommand(_executionContext.Object, envFile, null);
+                Assert.Equal(0, _issues.Count);
+                Assert.Equal(1, _executionContext.Object.Global.EnvironmentVariables.Count);
+                Assert.Equal($"hello{newline}world", _executionContext.Object.Global.EnvironmentVariables["MY_ENV"]);
+            }
+        }
+#endif
+
+        private void WriteContent(
+            string path,
+            List<string> content,
+            string newline = null)
+        {
+            if (string.IsNullOrEmpty(newline))
+            {
+                newline = Environment.NewLine;
+            }
+
+            var encoding = new UTF8Encoding(true); // Emit BOM
+            var contentStr = string.Join(newline, content);
+            File.WriteAllText(path, contentStr, encoding);
+        }
+
+        private TestHostContext Setup([CallerMemberName] string name = "")
+        {
+            _issues = new List<Tuple<DTWebApi.Issue, string>>();
+
+            var hostContext = new TestHostContext(this, name);
+
+            // Trace
+            _trace = hostContext.GetTrace();
+
+            // Directory for test data
+            var workDirectory = hostContext.GetDirectory(WellKnownDirectory.Work);
+            ArgUtil.NotNullOrEmpty(workDirectory, nameof(workDirectory));
+            Directory.CreateDirectory(workDirectory);
+            _rootDirectory = Path.Combine(workDirectory, nameof(SetEnvFileCommandL0));
+            Directory.CreateDirectory(_rootDirectory);
+
+            // Execution context
+            _executionContext = new Mock<IExecutionContext>();
+            _executionContext.Setup(x => x.Global)
+                .Returns(new GlobalContext
+                {
+                    EnvironmentVariables = new Dictionary<string, string>(VarUtil.EnvironmentVariableKeyComparer),
+                    WriteDebug = true,
+                });
+            _executionContext.Setup(x => x.AddIssue(It.IsAny<DTWebApi.Issue>(), It.IsAny<string>()))
+                .Callback((DTWebApi.Issue issue, string logMessage) =>
+                {
+                    _issues.Add(new Tuple<DTWebApi.Issue, string>(issue, logMessage));
+                    var message = !string.IsNullOrEmpty(logMessage) ? logMessage : issue.Message;
+                    _trace.Info($"Issue '{issue.Type}': {message}");
+                });
+            _executionContext.Setup(x => x.Write(It.IsAny<string>(), It.IsAny<string>()))
+                .Callback((string tag, string message) =>
+                {
+                    _trace.Info($"{tag}{message}");
+                });
+
+            // SetEnvFileCommand
+            _setEnvFileCommand = new SetEnvFileCommand();
+            _setEnvFileCommand.Initialize(hostContext);
+
+            return hostContext;
+        }
+    }
+}

src/Test/L0/Worker/StepsRunnerL0.cs

@@ -38,11 +38,13 @@ namespace GitHub.Runner.Common.Tests.Worker
             };
             _ec = new Mock<IExecutionContext>();
             _ec.SetupAllProperties();
-            _ec.Setup(x => x.Variables).Returns(_variables);
+            _ec.Setup(x => x.Global).Returns(new GlobalContext { WriteDebug = true });
+            _ec.Object.Global.Variables = _variables;
+            _ec.Object.Global.EnvironmentVariables = _env;
 
             _contexts = new DictionaryContextData();
             _jobContext = new JobContext();
-            _contexts["github"] = new DictionaryContextData();
+            _contexts["github"] = new GitHubContext();
             _contexts["runner"] = new DictionaryContextData();
             _contexts["job"] = _jobContext;
             _ec.Setup(x => x.ExpressionValues).Returns(_contexts);
@@ -50,7 +52,7 @@ namespace GitHub.Runner.Common.Tests.Worker
             _ec.Setup(x => x.JobContext).Returns(_jobContext);
 
             _stepContext = new StepsContext();
-            _ec.Setup(x => x.StepsContext).Returns(_stepContext);
+            _ec.Object.Global.StepsContext = _stepContext;
 
             _ec.Setup(x => x.PostJobSteps).Returns(new Stack<IStep>());
 
@@ -80,7 +82,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 {
                     _ec.Object.Result = null;
 
-                    _ec.Setup(x => x.JobSteps).Returns(new List<IStep>(variableSet.Select(x => x.Object).ToList()));
+                    _ec.Setup(x => x.JobSteps).Returns(new Queue<IStep>(variableSet.Select(x => x.Object).ToList()));
 
                     // Act.
                     await _stepsRunner.RunAsync(jobContext: _ec.Object);
@@ -115,7 +117,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 {
                     _ec.Object.Result = null;
 
-                    _ec.Setup(x => x.JobSteps).Returns(new List<IStep>(variableSet.Select(x => x.Object).ToList()));
+                    _ec.Setup(x => x.JobSteps).Returns(new Queue<IStep>(variableSet.Select(x => x.Object).ToList()));
 
                     // Act.
                     await _stepsRunner.RunAsync(jobContext: _ec.Object);
@@ -154,7 +156,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 {
                     _ec.Object.Result = null;
 
-                    _ec.Setup(x => x.JobSteps).Returns(new List<IStep>(variableSet.Steps.Select(x => x.Object).ToList()));
+                    _ec.Setup(x => x.JobSteps).Returns(new Queue<IStep>(variableSet.Steps.Select(x => x.Object).ToList()));
 
                     // Act.
                     await _stepsRunner.RunAsync(jobContext: _ec.Object);
@@ -208,7 +210,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 {
                     _ec.Object.Result = null;
 
-                    _ec.Setup(x => x.JobSteps).Returns(new List<IStep>(variableSet.Steps.Select(x => x.Object).ToList()));
+                    _ec.Setup(x => x.JobSteps).Returns(new Queue<IStep>(variableSet.Steps.Select(x => x.Object).ToList()));
 
                     // Act.
                     await _stepsRunner.RunAsync(jobContext: _ec.Object);
@@ -287,7 +289,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 {
                     _ec.Object.Result = null;
 
-                    _ec.Setup(x => x.JobSteps).Returns(new List<IStep>(variableSet.Steps.Select(x => x.Object).ToList()));
+                    _ec.Setup(x => x.JobSteps).Returns(new Queue<IStep>(variableSet.Steps.Select(x => x.Object).ToList()));
 
                     // Act.
                     await _stepsRunner.RunAsync(jobContext: _ec.Object);
@@ -330,7 +332,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 {
                     _ec.Object.Result = null;
 
-                    _ec.Setup(x => x.JobSteps).Returns(new List<IStep>(variableSet.Step.Select(x => x.Object).ToList()));
+                    _ec.Setup(x => x.JobSteps).Returns(new Queue<IStep>(variableSet.Step.Select(x => x.Object).ToList()));
 
                     // Act.
                     await _stepsRunner.RunAsync(jobContext: _ec.Object);
@@ -361,7 +363,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 {
                     _ec.Object.Result = null;
 
-                    _ec.Setup(x => x.JobSteps).Returns(new List<IStep>(variableSet.Select(x => x.Object).ToList()));
+                    _ec.Setup(x => x.JobSteps).Returns(new Queue<IStep>(variableSet.Select(x => x.Object).ToList()));
 
                     // Act.
                     await _stepsRunner.RunAsync(jobContext: _ec.Object);
@@ -391,7 +393,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 {
                     _ec.Object.Result = null;
 
-                    _ec.Setup(x => x.JobSteps).Returns(new List<IStep>(variableSet.Select(x => x.Object).ToList()));
+                    _ec.Setup(x => x.JobSteps).Returns(new Queue<IStep>(variableSet.Select(x => x.Object).ToList()));
 
                     // Act.
                     await _stepsRunner.RunAsync(jobContext: _ec.Object);
@@ -417,7 +419,7 @@ namespace GitHub.Runner.Common.Tests.Worker
 
                 _ec.Object.Result = null;
 
-                _ec.Setup(x => x.JobSteps).Returns(new List<IStep>(new[] { step1.Object }));
+                _ec.Setup(x => x.JobSteps).Returns(new Queue<IStep>(new[] { step1.Object }));
 
                 // Act.
                 await _stepsRunner.RunAsync(jobContext: _ec.Object);
@@ -455,7 +457,7 @@ namespace GitHub.Runner.Common.Tests.Worker
 
                 _ec.Object.Result = null;
 
-                _ec.Setup(x => x.JobSteps).Returns(new List<IStep>(new[] { step1.Object, step2.Object }));
+                _ec.Setup(x => x.JobSteps).Returns(new Queue<IStep>(new[] { step1.Object, step2.Object }));
 
                 // Act.
                 await _stepsRunner.RunAsync(jobContext: _ec.Object);
@@ -493,7 +495,7 @@ namespace GitHub.Runner.Common.Tests.Worker
 
                 _ec.Object.Result = null;
 
-                _ec.Setup(x => x.JobSteps).Returns(new List<IStep>(new[] { step1.Object, step2.Object }));
+                _ec.Setup(x => x.JobSteps).Returns(new Queue<IStep>(new[] { step1.Object, step2.Object }));
 
                 // Act.
                 await _stepsRunner.RunAsync(jobContext: _ec.Object);
@@ -524,7 +526,7 @@ namespace GitHub.Runner.Common.Tests.Worker
 
                 _ec.Object.Result = null;
 
-                _ec.Setup(x => x.JobSteps).Returns(new List<IStep>(new[] { step1.Object, step2.Object, step3.Object }));
+                _ec.Setup(x => x.JobSteps).Returns(new Queue<IStep>(new[] { step1.Object, step2.Object, step3.Object }));
 
                 // Act.
                 await _stepsRunner.RunAsync(jobContext: _ec.Object);
@@ -560,7 +562,7 @@ namespace GitHub.Runner.Common.Tests.Worker
 
                 _ec.Object.Result = null;
 
-                _ec.Setup(x => x.JobSteps).Returns(new List<IStep>(new[] { step1.Object, step2.Object, step3.Object }));
+                _ec.Setup(x => x.JobSteps).Returns(new Queue<IStep>(new[] { step1.Object, step2.Object, step3.Object }));
 
                 // Act.
                 await _stepsRunner.RunAsync(jobContext: _ec.Object);
@@ -599,13 +601,15 @@ namespace GitHub.Runner.Common.Tests.Worker
             // Setup the step execution context.
             var stepContext = new Mock<IExecutionContext>();
             stepContext.SetupAllProperties();
-            stepContext.Setup(x => x.WriteDebug).Returns(true);
-            stepContext.Setup(x => x.Variables).Returns(_variables);
-            stepContext.Setup(x => x.EnvironmentVariables).Returns(_env);
-            stepContext.Setup(x => x.ExpressionValues).Returns(new DictionaryContextData());
+            stepContext.Setup(x => x.Global).Returns(() => _ec.Object.Global);
+            var expressionValues = new DictionaryContextData();
+            foreach (var pair in _ec.Object.ExpressionValues)
+            {
+                expressionValues[pair.Key] = pair.Value;
+            }
+            stepContext.Setup(x => x.ExpressionValues).Returns(expressionValues);
             stepContext.Setup(x => x.ExpressionFunctions).Returns(new List<IFunctionInfo>());
             stepContext.Setup(x => x.JobContext).Returns(_jobContext);
-            stepContext.Setup(x => x.StepsContext).Returns(_stepContext);
             stepContext.Setup(x => x.ContextName).Returns(step.Object.Action.ContextName);
             stepContext.Setup(x => x.Complete(It.IsAny<TaskResult?>(), It.IsAny<string>(), It.IsAny<string>()))
                 .Callback((TaskResult? r, string currentOperation, string resultCode) =>

src/Test/L0/Worker/WorkerL0.cs

@@ -67,7 +67,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                     new Pipelines.ContextData.DictionaryContextData()
                 },
             };
-            var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, JobId, jobName, jobName, new StringToken(null, null, null, "ubuntu"), sidecarContainers, null, variables, new List<MaskHint>(), resources, context, null, actions, null, null, null, null);
+            var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, JobId, jobName, jobName, new StringToken(null, null, null, "ubuntu"), sidecarContainers, null, variables, new List<MaskHint>(), resources, context, null, actions, null, null, null);
             return jobRequest;
         }
 

src/runnerversion

@@ -1 +1 @@
-2.267.0
+2.273.1