Merge pull request #76 from summerwind/fix-crash-on-startup

Fix crash on startup after the HRDA addition

README.md

@@ -6,11 +6,15 @@ This controller operates self-hosted runners for GitHub Actions on your Kubernet
 
 [GitHub Actions](https://github.com/features/actions) is a very useful tool for automating development. GitHub Actions jobs are run in the cloud by default, but you may want to run your jobs in your environment. [Self-hosted runner](https://github.com/actions/runner) can be used for such use cases, but requires the provisioning and configuration of a virtual machine instance. Instead if you already have a Kubernetes cluster, it makes more sense to run the self-hosted runner on top of it.
 
-*actions-runner-controller* makes that possible. Just create a *Runner* resource on your Kubernetes, and it will run and operate the self-hosted runner for the specified repository. Combined with Kubernetes RBAC, you can also build simple Self-hosted runners as a Service.
+**actions-runner-controller** makes that possible. Just create a *Runner* resource on your Kubernetes, and it will run and operate the self-hosted runner for the specified repository. Combined with Kubernetes RBAC, you can also build simple Self-hosted runners as a Service.
 
 ## Installation
 
-First, install *actions-runner-controller* with a manifest file. This will create *actions-runner-system* namespace in your Kubernetes and deploy the required resources.
+actions-runner-controller uses [cert-manager](https://cert-manager.io/docs/installation/kubernetes/) for certificate management of Admission Webhook. Make sure you have already installed cert-manager before you install. The installation instructions for cert-manager can be found below.
+
+- [Installing cert-manager on Kubernetes](https://cert-manager.io/docs/installation/kubernetes/)
+
+Install the custom resource and actions-runner-controller itself. This will create actions-runner-system namespace in your Kubernetes and deploy the required resources.
 
 ```
 $ kubectl apply -f https://github.com/summerwind/actions-runner-controller/releases/latest/download/actions-runner-controller.yaml
@@ -18,7 +22,7 @@ $ kubectl apply -f https://github.com/summerwind/actions-runner-controller/relea
 
 ## Setting up authentication with GitHub API
 
-There are two ways for _actions-runner-controller_ to authenticate with the the GitHub API:
+There are two ways for actions-runner-controller to authenticate with the the GitHub API:
 
 1. Using GitHub App.
 2. Using Personal Access Token.
@@ -33,7 +37,7 @@ You can create a GitHub App for either your account or any organization. If you
 
 If you want to create a GitHub App for your organization, replace the `:org` part of the following URL with your organization name before opening it. Then enter any unique name in the "GitHub App name" field, and hit the "Create GitHub App" button at the bottom of the page to create a GitHub App.
 
-- [Create GitHub Apps on your organization](https://github.com/organizations/:org/settings/apps/new?url=http://github.com/summerwind/actions-runner-controller&webhook_active=false&public=false&administration=write)
+- [Create GitHub Apps on your organization](https://github.com/organizations/:org/settings/apps/new?url=http://github.com/summerwind/actions-runner-controller&webhook_active=false&public=false&administration=write&organization_self_hosted_runners=write)
 
 You will see an *App ID* on the page of the GitHub App you created as follows, the value of this App ID will be used later.
 
@@ -66,9 +70,11 @@ $ kubectl create secret generic controller-manager \
 
 From an account that has `admin` privileges for the repository, create a [personal access token](https://github.com/settings/tokens) with `repo` scope. This token is used to register a self-hosted runner by *actions-runner-controller*.
 
-To use a Personal Access Token, you must issue the token with an account that has `admin` privileges.
+Self-hosted runners in GitHub can either be connected to a single repository, or to a GitHub organization (so they are available to all repositories in the organization). This token is used to register a self-hosted runner by *actions-runner-controller*.
 
-Open the Create Token page from the following link, grant the `repo` scope, and press the "Generate Token" button at the bottom of the page to create the token.
+For adding a runner to a repository, the token should have `repo` scope. If the runner should be added to an organization, the token should have `admin:org` scope. Note that to use a Personal Access Token, you must issue the token with an account that has `admin` privileges (on the repository and/or the organization).
+
+Open the Create Token page from the following link, grant the `repo` and/or `admin:org` scope, and press the "Generate Token" button at the bottom of the page to create the token.
 
 - [Create personal access token](https://github.com/settings/tokens/new)
 
@@ -87,7 +93,7 @@ There are two ways to use this controller:
 - Manage runners one by one with `Runner`.
 - Manage a set of runners with `RunnerDeployment`.
 
-### Runners
+### Repository runners
 
 To launch a single self-hosted runner, you need to create a manifest file includes *Runner* resource as follows. This example launches a self-hosted runner with name *example-runner* for the *summerwind/actions-runner-controller* repository.
 
@@ -131,6 +137,22 @@ The runner you created has been registered to your repository.
 
 Now your can use your self-hosted runner. See the [official documentation](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/using-self-hosted-runners-in-a-workflow) on how to run a job with it.
 
+### Organization Runners
+
+To add the runner to an organization, you only need to replace the `repository` field with `organization`, so the runner will register itself to the organization.
+
+```
+# runner.yaml
+apiVersion: actions.summerwind.dev/v1alpha1
+kind: Runner
+metadata:
+  name: example-org-runner
+spec:
+  organization: your-organization-name
+```
+
+Now you can see the runner on the organization level (if you have organization owner permissions).
+
 ### RunnerDeployments
 
 There are `RunnerReplicaSet` and `RunnerDeployment` that corresponds to `ReplicaSet` and `Deployment` but for `Runner`.
@@ -162,12 +184,73 @@ You can see that 2 runners have been created as specified by `replicas: 2`:
 
 ```
 $ kubectl get runners
-NAME             REPOSITORY                             STATUS
 NAME                             REPOSITORY                             STATUS
 example-runnerdeploy2475h595fr   mumoshu/actions-runner-controller-ci   Running
 example-runnerdeploy2475ht2qbr   mumoshu/actions-runner-controller-ci   Running
 ```
 
+#### Autoscaling
+
+`RunnerDeployment` can scale number of runners between `minReplicas` and `maxReplicas` fields, depending on pending workflow runs.
+
+In the below example, `actions-runner` checks for pending workflow runs for each sync period, and scale to e.g. 3 if there're 3 pending jobs at sync time.
+
+```
+apiVersion: actions.summerwind.dev/v1alpha1
+kind: RunnerDeployment
+metadata:
+  name: example-runner-deployment
+spec:
+  template:
+    spec:
+      repository: summerwind/actions-runner-controller
+---
+apiVersion: actions.summerwind.dev/v1alpha1
+kind: HorizontalRunnerAutoscaler
+metadata:
+  name: example-runner-deployment-autoscaler
+spec:
+  scaleTargetRef:
+    name: example-runner-deployment
+  minReplicas: 1
+  maxReplicas: 3
+  metrics:
+  - type: TotalNumberOfQueuedAndInProgressWorkflowRuns
+    repositoryNames:
+    - summerwind/actions-runner-controller
+```
+
+Please also note that the sync period is set to 10 minutes by default and it's configurable via `--sync-period` flag.
+
+Additionally, the autoscaling feature has an anti-flapping option that prevents periodic loop of scaling up and down.
+By default, it doesn't scale down until the grace period of 10 minutes passes after a scale up. The grace period can be configured by setting `scaleDownDelaySecondsAfterScaleUp`:
+
+```
+apiVersion: actions.summerwind.dev/v1alpha1
+kind: RunnerDeployment
+metadata:
+  name: example-runner-deployment
+spec:
+  template:
+    spec:
+      repository: summerwind/actions-runner-controller
+---
+apiVersion: actions.summerwind.dev/v1alpha1
+kind: HorizontalRunnerAutoscaler
+metadata:
+  name: example-runner-deployment-autoscaler
+spec:
+  scaleTargetRef:
+    name: example-runner-deployment
+  minReplicas: 1
+  maxReplicas: 3
+  scaleDownDelaySecondsAfterScaleOut: 60
+  metrics:
+  - type: TotalNumberOfQueuedAndInProgressWorkflowRuns
+    repositoryNames:
+    - summerwind/actions-runner-controller
+```
+
 ## Additional tweaks
 
 You can pass details through the spec selector. Here's an eg. of what you may like to do:
@@ -191,8 +274,8 @@ spec:
         operator: Exists
 
       repository: mumoshu/actions-runner-controller-ci
-      ImagePullPolicy: Always
       image: custom-image/actions-runner:latest
+      imagePullPolicy: Always
       resources:
         limits:
           cpu: "4.0"
@@ -209,3 +292,75 @@ spec:
           securityContext:
             runAsUser: 0
 ```
+
+## Runner labels
+
+To run a workflow job on a self-hosted runner, you can use the following syntax in your workflow:
+
+```yaml
+jobs:
+  release:
+    runs-on: self-hosted
+```
+
+When you have multiple kinds of self-hosted runners, you can distinguish between them using labels. In order to do so, you can specify one or more labels in your `Runner` or `RunnerDeployment` spec.
+
+```yaml
+# runnerdeployment.yaml
+apiVersion: actions.summerwind.dev/v1alpha1
+kind: RunnerDeployment
+metadata:
+  name: custom-runner
+spec:
+  replicas: 1
+  template:
+    spec:
+      repository: summerwind/actions-runner-controller
+      labels:
+        - custom-runner
+```
+
+Once this spec is applied, you can observe the labels for your runner from the repository or organization in the GitHub settings page for the repository or organization. You can now select a specific runner from your workflow by using the label in `runs-on`:
+
+```yaml
+jobs:
+  release:
+    runs-on: custom-runner
+```
+
+Note that if you specify `self-hosted` in your worlflow, then this will run your job on _any_ self-hosted runner, regardless of the labels that they have.
+
+## Softeware installed in the runner image
+
+The GitHub hosted runners include a large amount of pre-installed software packages. For Ubuntu 18.04, this list can be found at https://github.com/actions/virtual-environments/blob/master/images/linux/Ubuntu1804-README.md
+
+The container image is based on Ubuntu 18.04, but it does not contain all of the software installed on the GitHub runners. It contains the following subset of packages from the GitHub runners:
+
+* Basic CLI packages
+* git (2.26)
+* docker
+* build-essentials
+
+The virtual environments from GitHub contain a lot more software packages (different versions of Java, Node.js, Golang, .NET, etc) which are not provided in the runner image. Most of these have dedicated setup actions which allow the tools to be installed on-demand in a workflow, for example: `actions/setup-java` or `actions/setup-node`
+
+If there is a need to include packages in the runner image for which there is no setup action, then this can be achieved by building a custom container image for the runner. The easiest way is to start with the `summerwind/actions-runner` image and installing the extra dependencies directly in the docker image:
+
+```yaml
+FROM summerwind/actions-runner:v2.169.1
+
+RUN sudo apt update -y \
+  && apt install YOUR_PACKAGE
+  && rm -rf /var/lib/apt/lists/*
+```
+
+You can then configure the runner to use a custom docker image by configuring the `image` field of a `Runner` or `RunnerDeployment`:
+
+```yaml
+apiVersion: actions.summerwind.dev/v1alpha1
+kind: Runner
+metadata:
+  name: custom-runner
+spec:
+  repository: summerwind/actions-runner-controller
+  image: YOUR_CUSTOM_DOCKER_IMAGE
+```

api/v1alpha1/horizontalrunnerautoscaler_types.go

@@ -0,0 +1,102 @@
+/*
+Copyright 2020 The actions-runner-controller authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package v1alpha1
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// HorizontalRunnerAutoscalerSpec defines the desired state of HorizontalRunnerAutoscaler
+type HorizontalRunnerAutoscalerSpec struct {
+	// ScaleTargetRef sis the reference to scaled resource like RunnerDeployment
+	ScaleTargetRef ScaleTargetRef `json:"scaleTargetRef,omitempty"`
+
+	// MinReplicas is the minimum number of replicas the deployment is allowed to scale
+	// +optional
+	MinReplicas *int `json:"minReplicas,omitempty"`
+
+	// MinReplicas is the maximum number of replicas the deployment is allowed to scale
+	// +optional
+	MaxReplicas *int `json:"maxReplicas,omitempty"`
+
+	// ScaleDownDelaySecondsAfterScaleUp is the approximate delay for a scale down followed by a scale up
+	// Used to prevent flapping (down->up->down->... loop)
+	// +optional
+	ScaleDownDelaySecondsAfterScaleUp *int `json:"scaleDownDelaySecondsAfterScaleOut,omitempty"`
+
+	// Metrics is the collection of various metric targets to calculate desired number of runners
+	// +optional
+	Metrics []MetricSpec `json:"metrics,omitempty"`
+}
+
+type ScaleTargetRef struct {
+	Name string `json:"name,omitempty"`
+}
+
+type MetricSpec struct {
+	// Type is the type of metric to be used for autoscaling.
+	// The only supported Type is TotalNumberOfQueuedAndInProgressWorkflowRuns
+	Type string `json:"type,omitempty"`
+
+	// RepositoryNames is the list of repository names to be used for calculating the metric.
+	// For example, a repository name is the REPO part of `github.com/USER/REPO`.
+	// +optional
+	RepositoryNames []string `json:"repositoryNames,omitempty"`
+}
+
+type HorizontalRunnerAutoscalerStatus struct {
+	// ObservedGeneration is the most recent generation observed for the target. It corresponds to e.g.
+	// RunnerDeployment's generation, which is updated on mutation by the API Server.
+	// +optional
+	ObservedGeneration int64 `json:"observedGeneration,omitempty"`
+
+	// DesiredReplicas is the total number of desired, non-terminated and latest pods to be set for the primary RunnerSet
+	// This doesn't include outdated pods while upgrading the deployment and replacing the runnerset.
+	// +optional
+	DesiredReplicas *int `json:"desiredReplicas,omitempty"`
+
+	// +optional
+	LastSuccessfulScaleOutTime *metav1.Time `json:"lastSuccessfulScaleOutTime,omitempty"`
+}
+
+// +kubebuilder:object:root=true
+// +kubebuilder:subresource:status
+// +kubebuilder:printcolumn:JSONPath=".spec.minReplicas",name=Min,type=number
+// +kubebuilder:printcolumn:JSONPath=".spec.maxReplicas",name=Max,type=number
+// +kubebuilder:printcolumn:JSONPath=".status.desiredReplicas",name=Desired,type=number
+
+// HorizontalRunnerAutoscaler is the Schema for the horizontalrunnerautoscaler API
+type HorizontalRunnerAutoscaler struct {
+	metav1.TypeMeta   `json:",inline"`
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
+	Spec   HorizontalRunnerAutoscalerSpec   `json:"spec,omitempty"`
+	Status HorizontalRunnerAutoscalerStatus `json:"status,omitempty"`
+}
+
+// +kubebuilder:object:root=true
+
+// HorizontalRunnerAutoscalerList contains a list of HorizontalRunnerAutoscaler
+type HorizontalRunnerAutoscalerList struct {
+	metav1.TypeMeta `json:",inline"`
+	metav1.ListMeta `json:"metadata,omitempty"`
+	Items           []HorizontalRunnerAutoscaler `json:"items"`
+}
+
+func init() {
+	SchemeBuilder.Register(&HorizontalRunnerAutoscaler{}, &HorizontalRunnerAutoscalerList{})
+}

api/v1alpha1/runner_types.go

@@ -17,15 +17,24 @@ limitations under the License.
 package v1alpha1
 
 import (
+	"errors"
+
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
 // RunnerSpec defines the desired state of Runner
 type RunnerSpec struct {
-	// +kubebuilder:validation:MinLength=3
+	// +optional
+	// +kubebuilder:validation:Pattern=`^[^/]+$`
+	Organization string `json:"organization,omitempty"`
+
+	// +optional
 	// +kubebuilder:validation:Pattern=`^[^/]+/[^/]+$`
-	Repository string `json:"repository"`
+	Repository string `json:"repository,omitempty"`
+
+	// +optional
+	Labels []string `json:"labels,omitempty"`
 
 	// +optional
 	Containers []corev1.Container `json:"containers,omitempty"`
@@ -39,6 +48,8 @@ type RunnerSpec struct {
 	// +optional
 	Image string `json:"image"`
 	// +optional
+	ImagePullPolicy corev1.PullPolicy `json:"imagePullPolicy,omitempty"`
+	// +optional
 	Env []corev1.EnvVar `json:"env,omitempty"`
 
 	// +optional
@@ -68,6 +79,19 @@ type RunnerSpec struct {
 	TerminationGracePeriodSeconds *int64 `json:"terminationGracePeriodSeconds,omitempty"`
 }
 
+// ValidateRepository validates repository field.
+func (rs *RunnerSpec) ValidateRepository() error {
+	// Organization and repository are both exclusive.
+	if len(rs.Organization) == 0 && len(rs.Repository) == 0 {
+		return errors.New("Spec needs organization or repository")
+	}
+	if len(rs.Organization) > 0 && len(rs.Repository) > 0 {
+		return errors.New("Spec cannot have both organization and repository")
+	}
+
+	return nil
+}
+
 // RunnerStatus defines the observed state of Runner
 type RunnerStatus struct {
 	Registration RunnerStatusRegistration `json:"registration"`
@@ -76,15 +100,20 @@ type RunnerStatus struct {
 	Message      string                   `json:"message"`
 }
 
+// RunnerStatusRegistration contains runner registration status
 type RunnerStatusRegistration struct {
-	Repository string      `json:"repository"`
-	Token      string      `json:"token"`
-	ExpiresAt  metav1.Time `json:"expiresAt"`
+	Organization string      `json:"organization,omitempty"`
+	Repository   string      `json:"repository,omitempty"`
+	Labels       []string    `json:"labels,omitempty"`
+	Token        string      `json:"token"`
+	ExpiresAt    metav1.Time `json:"expiresAt"`
 }
 
 // +kubebuilder:object:root=true
 // +kubebuilder:subresource:status
+// +kubebuilder:printcolumn:JSONPath=".spec.organization",name=Organization,type=string
 // +kubebuilder:printcolumn:JSONPath=".spec.repository",name=Repository,type=string
+// +kubebuilder:printcolumn:JSONPath=".spec.labels",name=Labels,type=string
 // +kubebuilder:printcolumn:JSONPath=".status.phase",name=Status,type=string
 
 // Runner is the Schema for the runners API

api/v1alpha1/runner_webhook.go

@@ -0,0 +1,84 @@
+/*
+Copyright 2020 The actions-runner-controller authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package v1alpha1
+
+import (
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/util/validation/field"
+	ctrl "sigs.k8s.io/controller-runtime"
+	logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
+	"sigs.k8s.io/controller-runtime/pkg/webhook"
+)
+
+// log is for logging in this package.
+var runnerLog = logf.Log.WithName("runner-resource")
+
+func (r *Runner) SetupWebhookWithManager(mgr ctrl.Manager) error {
+	return ctrl.NewWebhookManagedBy(mgr).
+		For(r).
+		Complete()
+}
+
+// +kubebuilder:webhook:path=/mutate-actions-summerwind-dev-v1alpha1-runner,verbs=create;update,mutating=true,failurePolicy=fail,groups=actions.summerwind.dev,resources=runners,versions=v1alpha1,name=mutate.runner.actions.summerwind.dev
+
+var _ webhook.Defaulter = &Runner{}
+
+// Default implements webhook.Defaulter so a webhook will be registered for the type
+func (r *Runner) Default() {
+	// Nothing to do.
+}
+
+// +kubebuilder:webhook:path=/validate-actions-summerwind-dev-v1alpha1-runner,verbs=create;update,mutating=false,failurePolicy=fail,groups=actions.summerwind.dev,resources=runners,versions=v1alpha1,name=validate.runner.actions.summerwind.dev
+
+var _ webhook.Validator = &Runner{}
+
+// ValidateCreate implements webhook.Validator so a webhook will be registered for the type
+func (r *Runner) ValidateCreate() error {
+	runnerLog.Info("validate resource to be created", "name", r.Name)
+	return r.Validate()
+}
+
+// ValidateUpdate implements webhook.Validator so a webhook will be registered for the type
+func (r *Runner) ValidateUpdate(old runtime.Object) error {
+	runnerLog.Info("validate resource to be updated", "name", r.Name)
+	return r.Validate()
+}
+
+// ValidateDelete implements webhook.Validator so a webhook will be registered for the type
+func (r *Runner) ValidateDelete() error {
+	return nil
+}
+
+// Validate validates resource spec.
+func (r *Runner) Validate() error {
+	var (
+		errList field.ErrorList
+		err     error
+	)
+
+	err = r.Spec.ValidateRepository()
+	if err != nil {
+		errList = append(errList, field.Invalid(field.NewPath("spec", "repository"), r.Spec.Repository, err.Error()))
+	}
+
+	if len(errList) > 0 {
+		return apierrors.NewInvalid(r.GroupVersionKind().GroupKind(), r.Name, errList)
+	}
+
+	return nil
+}

api/v1alpha1/runnerdeployment_types.go

@@ -20,9 +20,14 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
+const (
+	AutoscalingMetricTypeTotalNumberOfQueuedAndInProgressWorkflowRuns = "TotalNumberOfQueuedAndInProgressWorkflowRuns"
+)
+
 // RunnerReplicaSetSpec defines the desired state of RunnerDeployment
 type RunnerDeploymentSpec struct {
-	Replicas *int `json:"replicas"`
+	// +optional
+	Replicas *int `json:"replicas,omitempty"`
 
 	Template RunnerTemplate `json:"template"`
 }
@@ -30,6 +35,11 @@ type RunnerDeploymentSpec struct {
 type RunnerDeploymentStatus struct {
 	AvailableReplicas int `json:"availableReplicas"`
 	ReadyReplicas     int `json:"readyReplicas"`
+
+	// Replicas is the total number of desired, non-terminated and latest pods to be set for the primary RunnerSet
+	// This doesn't include outdated pods while upgrading the deployment and replacing the runnerset.
+	// +optional
+	Replicas *int `json:"desiredReplicas,omitempty"`
 }
 
 // +kubebuilder:object:root=true

api/v1alpha1/runnerdeployment_webhook.go

@@ -0,0 +1,84 @@
+/*
+Copyright 2020 The actions-runner-controller authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package v1alpha1
+
+import (
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/util/validation/field"
+	ctrl "sigs.k8s.io/controller-runtime"
+	logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
+	"sigs.k8s.io/controller-runtime/pkg/webhook"
+)
+
+// log is for logging in this package.
+var runenrDeploymentLog = logf.Log.WithName("runnerdeployment-resource")
+
+func (r *RunnerDeployment) SetupWebhookWithManager(mgr ctrl.Manager) error {
+	return ctrl.NewWebhookManagedBy(mgr).
+		For(r).
+		Complete()
+}
+
+// +kubebuilder:webhook:path=/mutate-actions-summerwind-dev-v1alpha1-runnerdeployment,verbs=create;update,mutating=true,failurePolicy=fail,groups=actions.summerwind.dev,resources=runnerdeployments,versions=v1alpha1,name=mutate.runnerdeployment.actions.summerwind.dev
+
+var _ webhook.Defaulter = &RunnerDeployment{}
+
+// Default implements webhook.Defaulter so a webhook will be registered for the type
+func (r *RunnerDeployment) Default() {
+	// Nothing to do.
+}
+
+// +kubebuilder:webhook:path=/validate-actions-summerwind-dev-v1alpha1-runnerdeployment,verbs=create;update,mutating=false,failurePolicy=fail,groups=actions.summerwind.dev,resources=runnerdeployments,versions=v1alpha1,name=validate.runnerdeployment.actions.summerwind.dev
+
+var _ webhook.Validator = &RunnerDeployment{}
+
+// ValidateCreate implements webhook.Validator so a webhook will be registered for the type
+func (r *RunnerDeployment) ValidateCreate() error {
+	runenrDeploymentLog.Info("validate resource to be created", "name", r.Name)
+	return r.Validate()
+}
+
+// ValidateUpdate implements webhook.Validator so a webhook will be registered for the type
+func (r *RunnerDeployment) ValidateUpdate(old runtime.Object) error {
+	runenrDeploymentLog.Info("validate resource to be updated", "name", r.Name)
+	return r.Validate()
+}
+
+// ValidateDelete implements webhook.Validator so a webhook will be registered for the type
+func (r *RunnerDeployment) ValidateDelete() error {
+	return nil
+}
+
+// Validate validates resource spec.
+func (r *RunnerDeployment) Validate() error {
+	var (
+		errList field.ErrorList
+		err     error
+	)
+
+	err = r.Spec.Template.Spec.ValidateRepository()
+	if err != nil {
+		errList = append(errList, field.Invalid(field.NewPath("spec", "template", "spec", "repository"), r.Spec.Template.Spec.Repository, err.Error()))
+	}
+
+	if len(errList) > 0 {
+		return apierrors.NewInvalid(r.GroupVersionKind().GroupKind(), r.Name, errList)
+	}
+
+	return nil
+}

api/v1alpha1/runnerreplicaset_webhook.go

@@ -0,0 +1,84 @@
+/*
+Copyright 2020 The actions-runner-controller authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package v1alpha1
+
+import (
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/util/validation/field"
+	ctrl "sigs.k8s.io/controller-runtime"
+	logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
+	"sigs.k8s.io/controller-runtime/pkg/webhook"
+)
+
+// log is for logging in this package.
+var runnerReplicaSetLog = logf.Log.WithName("runnerreplicaset-resource")
+
+func (r *RunnerReplicaSet) SetupWebhookWithManager(mgr ctrl.Manager) error {
+	return ctrl.NewWebhookManagedBy(mgr).
+		For(r).
+		Complete()
+}
+
+// +kubebuilder:webhook:path=/mutate-actions-summerwind-dev-v1alpha1-runnerreplicaset,verbs=create;update,mutating=true,failurePolicy=fail,groups=actions.summerwind.dev,resources=runnerreplicasets,versions=v1alpha1,name=mutate.runnerreplicaset.actions.summerwind.dev
+
+var _ webhook.Defaulter = &RunnerReplicaSet{}
+
+// Default implements webhook.Defaulter so a webhook will be registered for the type
+func (r *RunnerReplicaSet) Default() {
+	// Nothing to do.
+}
+
+// +kubebuilder:webhook:path=/validate-actions-summerwind-dev-v1alpha1-runnerreplicaset,verbs=create;update,mutating=false,failurePolicy=fail,groups=actions.summerwind.dev,resources=runnerreplicasets,versions=v1alpha1,name=validate.runnerreplicaset.actions.summerwind.dev
+
+var _ webhook.Validator = &RunnerReplicaSet{}
+
+// ValidateCreate implements webhook.Validator so a webhook will be registered for the type
+func (r *RunnerReplicaSet) ValidateCreate() error {
+	runnerReplicaSetLog.Info("validate resource to be created", "name", r.Name)
+	return r.Validate()
+}
+
+// ValidateUpdate implements webhook.Validator so a webhook will be registered for the type
+func (r *RunnerReplicaSet) ValidateUpdate(old runtime.Object) error {
+	runnerReplicaSetLog.Info("validate resource to be updated", "name", r.Name)
+	return r.Validate()
+}
+
+// ValidateDelete implements webhook.Validator so a webhook will be registered for the type
+func (r *RunnerReplicaSet) ValidateDelete() error {
+	return nil
+}
+
+// Validate validates resource spec.
+func (r *RunnerReplicaSet) Validate() error {
+	var (
+		errList field.ErrorList
+		err     error
+	)
+
+	err = r.Spec.Template.Spec.ValidateRepository()
+	if err != nil {
+		errList = append(errList, field.Invalid(field.NewPath("spec", "template", "spec", "repository"), r.Spec.Template.Spec.Repository, err.Error()))
+	}
+
+	if len(errList) > 0 {
+		return apierrors.NewInvalid(r.GroupVersionKind().GroupKind(), r.Name, errList)
+	}
+
+	return nil
+}

api/v1alpha1/zz_generated.deepcopy.go

@@ -22,9 +22,150 @@ package v1alpha1
 
 import (
 	"k8s.io/api/core/v1"
-	runtime "k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime"
 )
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *HorizontalRunnerAutoscaler) DeepCopyInto(out *HorizontalRunnerAutoscaler) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	in.ObjectMeta.DeepCopyInto(&out.ObjectMeta)
+	in.Spec.DeepCopyInto(&out.Spec)
+	in.Status.DeepCopyInto(&out.Status)
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new HorizontalRunnerAutoscaler.
+func (in *HorizontalRunnerAutoscaler) DeepCopy() *HorizontalRunnerAutoscaler {
+	if in == nil {
+		return nil
+	}
+	out := new(HorizontalRunnerAutoscaler)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *HorizontalRunnerAutoscaler) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *HorizontalRunnerAutoscalerList) DeepCopyInto(out *HorizontalRunnerAutoscalerList) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	in.ListMeta.DeepCopyInto(&out.ListMeta)
+	if in.Items != nil {
+		in, out := &in.Items, &out.Items
+		*out = make([]HorizontalRunnerAutoscaler, len(*in))
+		for i := range *in {
+			(*in)[i].DeepCopyInto(&(*out)[i])
+		}
+	}
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new HorizontalRunnerAutoscalerList.
+func (in *HorizontalRunnerAutoscalerList) DeepCopy() *HorizontalRunnerAutoscalerList {
+	if in == nil {
+		return nil
+	}
+	out := new(HorizontalRunnerAutoscalerList)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *HorizontalRunnerAutoscalerList) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *HorizontalRunnerAutoscalerSpec) DeepCopyInto(out *HorizontalRunnerAutoscalerSpec) {
+	*out = *in
+	out.ScaleTargetRef = in.ScaleTargetRef
+	if in.MinReplicas != nil {
+		in, out := &in.MinReplicas, &out.MinReplicas
+		*out = new(int)
+		**out = **in
+	}
+	if in.MaxReplicas != nil {
+		in, out := &in.MaxReplicas, &out.MaxReplicas
+		*out = new(int)
+		**out = **in
+	}
+	if in.ScaleDownDelaySecondsAfterScaleUp != nil {
+		in, out := &in.ScaleDownDelaySecondsAfterScaleUp, &out.ScaleDownDelaySecondsAfterScaleUp
+		*out = new(int)
+		**out = **in
+	}
+	if in.Metrics != nil {
+		in, out := &in.Metrics, &out.Metrics
+		*out = make([]MetricSpec, len(*in))
+		for i := range *in {
+			(*in)[i].DeepCopyInto(&(*out)[i])
+		}
+	}
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new HorizontalRunnerAutoscalerSpec.
+func (in *HorizontalRunnerAutoscalerSpec) DeepCopy() *HorizontalRunnerAutoscalerSpec {
+	if in == nil {
+		return nil
+	}
+	out := new(HorizontalRunnerAutoscalerSpec)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *HorizontalRunnerAutoscalerStatus) DeepCopyInto(out *HorizontalRunnerAutoscalerStatus) {
+	*out = *in
+	if in.DesiredReplicas != nil {
+		in, out := &in.DesiredReplicas, &out.DesiredReplicas
+		*out = new(int)
+		**out = **in
+	}
+	if in.LastSuccessfulScaleOutTime != nil {
+		in, out := &in.LastSuccessfulScaleOutTime, &out.LastSuccessfulScaleOutTime
+		*out = (*in).DeepCopy()
+	}
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new HorizontalRunnerAutoscalerStatus.
+func (in *HorizontalRunnerAutoscalerStatus) DeepCopy() *HorizontalRunnerAutoscalerStatus {
+	if in == nil {
+		return nil
+	}
+	out := new(HorizontalRunnerAutoscalerStatus)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *MetricSpec) DeepCopyInto(out *MetricSpec) {
+	*out = *in
+	if in.RepositoryNames != nil {
+		in, out := &in.RepositoryNames, &out.RepositoryNames
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new MetricSpec.
+func (in *MetricSpec) DeepCopy() *MetricSpec {
+	if in == nil {
+		return nil
+	}
+	out := new(MetricSpec)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *Runner) DeepCopyInto(out *Runner) {
 	*out = *in
@@ -58,7 +199,7 @@ func (in *RunnerDeployment) DeepCopyInto(out *RunnerDeployment) {
 	out.TypeMeta = in.TypeMeta
 	in.ObjectMeta.DeepCopyInto(&out.ObjectMeta)
 	in.Spec.DeepCopyInto(&out.Spec)
-	out.Status = in.Status
+	in.Status.DeepCopyInto(&out.Status)
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new RunnerDeployment.
@@ -135,6 +276,11 @@ func (in *RunnerDeploymentSpec) DeepCopy() *RunnerDeploymentSpec {
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *RunnerDeploymentStatus) DeepCopyInto(out *RunnerDeploymentStatus) {
 	*out = *in
+	if in.Replicas != nil {
+		in, out := &in.Replicas, &out.Replicas
+		*out = new(int)
+		**out = **in
+	}
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new RunnerDeploymentStatus.
@@ -277,6 +423,11 @@ func (in *RunnerReplicaSetStatus) DeepCopy() *RunnerReplicaSetStatus {
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *RunnerSpec) DeepCopyInto(out *RunnerSpec) {
 	*out = *in
+	if in.Labels != nil {
+		in, out := &in.Labels, &out.Labels
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
 	if in.Containers != nil {
 		in, out := &in.Containers, &out.Containers
 		*out = make([]v1.Container, len(*in))
@@ -404,6 +555,11 @@ func (in *RunnerStatus) DeepCopy() *RunnerStatus {
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *RunnerStatusRegistration) DeepCopyInto(out *RunnerStatusRegistration) {
 	*out = *in
+	if in.Labels != nil {
+		in, out := &in.Labels, &out.Labels
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
 	in.ExpiresAt.DeepCopyInto(&out.ExpiresAt)
 }
 
@@ -433,3 +589,18 @@ func (in *RunnerTemplate) DeepCopy() *RunnerTemplate {
 	in.DeepCopyInto(out)
 	return out
 }
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *ScaleTargetRef) DeepCopyInto(out *ScaleTargetRef) {
+	*out = *in
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new ScaleTargetRef.
+func (in *ScaleTargetRef) DeepCopy() *ScaleTargetRef {
+	if in == nil {
+		return nil
+	}
+	out := new(ScaleTargetRef)
+	in.DeepCopyInto(out)
+	return out
+}

config/crd/bases/actions.summerwind.dev_horizontalrunnerautoscalers.yaml

@@ -0,0 +1,118 @@
+
+---
+apiVersion: apiextensions.k8s.io/v1beta1
+kind: CustomResourceDefinition
+metadata:
+  annotations:
+    controller-gen.kubebuilder.io/version: v0.2.4
+  creationTimestamp: null
+  name: horizontalrunnerautoscalers.actions.summerwind.dev
+spec:
+  additionalPrinterColumns:
+  - JSONPath: .spec.minReplicas
+    name: Min
+    type: number
+  - JSONPath: .spec.maxReplicas
+    name: Max
+    type: number
+  - JSONPath: .status.desiredReplicas
+    name: Desired
+    type: number
+  group: actions.summerwind.dev
+  names:
+    kind: HorizontalRunnerAutoscaler
+    listKind: HorizontalRunnerAutoscalerList
+    plural: horizontalrunnerautoscalers
+    singular: horizontalrunnerautoscaler
+  scope: Namespaced
+  subresources:
+    status: {}
+  validation:
+    openAPIV3Schema:
+      description: HorizontalRunnerAutoscaler is the Schema for the horizontalrunnerautoscaler
+        API
+      properties:
+        apiVersion:
+          description: 'APIVersion defines the versioned schema of this representation
+            of an object. Servers should convert recognized schemas to the latest
+            internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources'
+          type: string
+        kind:
+          description: 'Kind is a string value representing the REST resource this
+            object represents. Servers may infer this from the endpoint the client
+            submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds'
+          type: string
+        metadata:
+          type: object
+        spec:
+          description: HorizontalRunnerAutoscalerSpec defines the desired state of
+            HorizontalRunnerAutoscaler
+          properties:
+            maxReplicas:
+              description: MinReplicas is the maximum number of replicas the deployment
+                is allowed to scale
+              type: integer
+            metrics:
+              description: Metrics is the collection of various metric targets to
+                calculate desired number of runners
+              items:
+                properties:
+                  repositoryNames:
+                    description: RepositoryNames is the list of repository names to
+                      be used for calculating the metric. For example, a repository
+                      name is the REPO part of `github.com/USER/REPO`.
+                    items:
+                      type: string
+                    type: array
+                  type:
+                    description: Type is the type of metric to be used for autoscaling.
+                      The only supported Type is TotalNumberOfQueuedAndInProgressWorkflowRuns
+                    type: string
+                type: object
+              type: array
+            minReplicas:
+              description: MinReplicas is the minimum number of replicas the deployment
+                is allowed to scale
+              type: integer
+            scaleDownDelaySecondsAfterScaleOut:
+              description: ScaleDownDelaySecondsAfterScaleUp is the approximate delay
+                for a scale down followed by a scale up Used to prevent flapping (down->up->down->...
+                loop)
+              type: integer
+            scaleTargetRef:
+              description: ScaleTargetRef sis the reference to scaled resource like
+                RunnerDeployment
+              properties:
+                name:
+                  type: string
+              type: object
+          type: object
+        status:
+          properties:
+            desiredReplicas:
+              description: DesiredReplicas is the total number of desired, non-terminated
+                and latest pods to be set for the primary RunnerSet This doesn't include
+                outdated pods while upgrading the deployment and replacing the runnerset.
+              type: integer
+            lastSuccessfulScaleOutTime:
+              format: date-time
+              type: string
+            observedGeneration:
+              description: ObservedGeneration is the most recent generation observed
+                for the target. It corresponds to e.g. RunnerDeployment's generation,
+                which is updated on mutation by the API Server.
+              format: int64
+              type: integer
+          type: object
+      type: object
+  version: v1alpha1
+  versions:
+  - name: v1alpha1
+    served: true
+    storage: true
+status:
+  acceptedNames:
+    kind: ""
+    plural: ""
+  conditions: []
+  storedVersions: []

config/crd/bases/actions.summerwind.dev_runnerdeployments.yaml

@@ -3006,6 +3006,10 @@ spec:
                       type: array
                     image:
                       type: string
+                    imagePullPolicy:
+                      description: PullPolicy describes a policy for if/when to pull
+                        a container image
+                      type: string
                     imagePullSecrets:
                       items:
                         description: LocalObjectReference contains enough information
@@ -4111,12 +4115,18 @@ spec:
                         - name
                         type: object
                       type: array
+                    labels:
+                      items:
+                        type: string
+                      type: array
                     nodeSelector:
                       additionalProperties:
                         type: string
                       type: object
+                    organization:
+                      pattern: ^[^/]+$
+                      type: string
                     repository:
-                      minLength: 3
                       pattern: ^[^/]+/[^/]+$
                       type: string
                     resources:
@@ -6708,18 +6718,20 @@ spec:
                         - name
                         type: object
                       type: array
-                  required:
-                  - repository
                   type: object
               type: object
           required:
-          - replicas
           - template
           type: object
         status:
           properties:
             availableReplicas:
               type: integer
+            desiredReplicas:
+              description: Replicas is the total number of desired, non-terminated
+                and latest pods to be set for the primary RunnerSet This doesn't include
+                outdated pods while upgrading the deployment and replacing the runnerset.
+              type: integer
             readyReplicas:
               type: integer
           required:

config/crd/bases/actions.summerwind.dev_runnerreplicasets.yaml

@@ -3006,6 +3006,10 @@ spec:
                       type: array
                     image:
                       type: string
+                    imagePullPolicy:
+                      description: PullPolicy describes a policy for if/when to pull
+                        a container image
+                      type: string
                     imagePullSecrets:
                       items:
                         description: LocalObjectReference contains enough information
@@ -4111,12 +4115,18 @@ spec:
                         - name
                         type: object
                       type: array
+                    labels:
+                      items:
+                        type: string
+                      type: array
                     nodeSelector:
                       additionalProperties:
                         type: string
                       type: object
+                    organization:
+                      pattern: ^[^/]+$
+                      type: string
                     repository:
-                      minLength: 3
                       pattern: ^[^/]+/[^/]+$
                       type: string
                     resources:
@@ -6708,8 +6718,6 @@ spec:
                         - name
                         type: object
                       type: array
-                  required:
-                  - repository
                   type: object
               type: object
           required:

config/crd/bases/actions.summerwind.dev_runners.yaml

@@ -9,9 +9,15 @@ metadata:
   name: runners.actions.summerwind.dev
 spec:
   additionalPrinterColumns:
+  - JSONPath: .spec.organization
+    name: Organization
+    type: string
   - JSONPath: .spec.repository
     name: Repository
     type: string
+  - JSONPath: .spec.labels
+    name: Labels
+    type: string
   - JSONPath: .status.phase
     name: Status
     type: string
@@ -2809,6 +2815,10 @@ spec:
               type: array
             image:
               type: string
+            imagePullPolicy:
+              description: PullPolicy describes a policy for if/when to pull a container
+                image
+              type: string
             imagePullSecrets:
               items:
                 description: LocalObjectReference contains enough information to let
@@ -3854,12 +3864,18 @@ spec:
                 - name
                 type: object
               type: array
+            labels:
+              items:
+                type: string
+              type: array
             nodeSelector:
               additionalProperties:
                 type: string
               type: object
+            organization:
+              pattern: ^[^/]+$
+              type: string
             repository:
-              minLength: 3
               pattern: ^[^/]+/[^/]+$
               type: string
             resources:
@@ -6292,8 +6308,6 @@ spec:
                 - name
                 type: object
               type: array
-          required:
-          - repository
           type: object
         status:
           description: RunnerStatus defines the observed state of Runner
@@ -6305,17 +6319,23 @@ spec:
             reason:
               type: string
             registration:
+              description: RunnerStatusRegistration contains runner registration status
               properties:
                 expiresAt:
                   format: date-time
                   type: string
+                labels:
+                  items:
+                    type: string
+                  type: array
+                organization:
+                  type: string
                 repository:
                   type: string
                 token:
                   type: string
               required:
               - expiresAt
-              - repository
               - token
               type: object
           required:

config/default/kustomization.yaml

@@ -17,9 +17,9 @@ bases:
 - ../rbac
 - ../manager
 # [WEBHOOK] To enable webhook, uncomment all the sections with [WEBHOOK] prefix including the one in crd/kustomization.yaml
-#- ../webhook
+- ../webhook
 # [CERTMANAGER] To enable cert-manager, uncomment all sections with 'CERTMANAGER'. 'WEBHOOK' components are required.
-#- ../certmanager
+- ../certmanager
 # [PROMETHEUS] To enable prometheus monitor, uncomment all sections with 'PROMETHEUS'. 
 #- ../prometheus
 
@@ -36,39 +36,39 @@ patchesStrategicMerge:
 #- manager_prometheus_metrics_patch.yaml
 
 # [WEBHOOK] To enable webhook, uncomment all the sections with [WEBHOOK] prefix including the one in crd/kustomization.yaml
-#- manager_webhook_patch.yaml
+- manager_webhook_patch.yaml
 
 # [CERTMANAGER] To enable cert-manager, uncomment all sections with 'CERTMANAGER'.
 # Uncomment 'CERTMANAGER' sections in crd/kustomization.yaml to enable the CA injection in the admission webhooks.
 # 'CERTMANAGER' needs to be enabled to use ca injection
-#- webhookcainjection_patch.yaml
+- webhookcainjection_patch.yaml
 
 # the following config is for teaching kustomize how to do var substitution
 vars:
 # [CERTMANAGER] To enable cert-manager, uncomment all sections with 'CERTMANAGER' prefix.
-#- name: CERTIFICATE_NAMESPACE # namespace of the certificate CR
-#  objref:
-#    kind: Certificate
-#    group: cert-manager.io
-#    version: v1alpha2
-#    name: serving-cert # this name should match the one in certificate.yaml
-#  fieldref:
-#    fieldpath: metadata.namespace
-#- name: CERTIFICATE_NAME
-#  objref:
-#    kind: Certificate
-#    group: cert-manager.io
-#    version: v1alpha2
-#    name: serving-cert # this name should match the one in certificate.yaml
-#- name: SERVICE_NAMESPACE # namespace of the service
-#  objref:
-#    kind: Service
-#    version: v1
-#    name: webhook-service
-#  fieldref:
-#    fieldpath: metadata.namespace
-#- name: SERVICE_NAME
-#  objref:
-#    kind: Service
-#    version: v1
-#    name: webhook-service
+- name: CERTIFICATE_NAMESPACE # namespace of the certificate CR
+  objref:
+    kind: Certificate
+    group: cert-manager.io
+    version: v1alpha2
+    name: serving-cert # this name should match the one in certificate.yaml
+  fieldref:
+    fieldpath: metadata.namespace
+- name: CERTIFICATE_NAME
+  objref:
+    kind: Certificate
+    group: cert-manager.io
+    version: v1alpha2
+    name: serving-cert # this name should match the one in certificate.yaml
+- name: SERVICE_NAMESPACE # namespace of the service
+  objref:
+    kind: Service
+    version: v1
+    name: webhook-service
+  fieldref:
+    fieldpath: metadata.namespace
+- name: SERVICE_NAME
+  objref:
+    kind: Service
+    version: v1
+    name: webhook-service

config/rbac/role.yaml

@@ -6,6 +6,26 @@ metadata:
   creationTimestamp: null
   name: manager-role
 rules:
+- apiGroups:
+  - actions.summerwind.dev
+  resources:
+  - horizontalrunnerautoscalers
+  verbs:
+  - create
+  - delete
+  - get
+  - list
+  - patch
+  - update
+  - watch
+- apiGroups:
+  - actions.summerwind.dev
+  resources:
+  - horizontalrunnerautoscalers/status
+  verbs:
+  - get
+  - patch
+  - update
 - apiGroups:
   - actions.summerwind.dev
   resources:

config/webhook/manifests.yaml

@@ -0,0 +1,124 @@
+
+---
+apiVersion: admissionregistration.k8s.io/v1beta1
+kind: MutatingWebhookConfiguration
+metadata:
+  creationTimestamp: null
+  name: mutating-webhook-configuration
+webhooks:
+- clientConfig:
+    caBundle: Cg==
+    service:
+      name: webhook-service
+      namespace: system
+      path: /mutate-actions-summerwind-dev-v1alpha1-runner
+  failurePolicy: Fail
+  name: mutate.runner.actions.summerwind.dev
+  rules:
+  - apiGroups:
+    - actions.summerwind.dev
+    apiVersions:
+    - v1alpha1
+    operations:
+    - CREATE
+    - UPDATE
+    resources:
+    - runners
+- clientConfig:
+    caBundle: Cg==
+    service:
+      name: webhook-service
+      namespace: system
+      path: /mutate-actions-summerwind-dev-v1alpha1-runnerdeployment
+  failurePolicy: Fail
+  name: mutate.runnerdeployment.actions.summerwind.dev
+  rules:
+  - apiGroups:
+    - actions.summerwind.dev
+    apiVersions:
+    - v1alpha1
+    operations:
+    - CREATE
+    - UPDATE
+    resources:
+    - runnerdeployments
+- clientConfig:
+    caBundle: Cg==
+    service:
+      name: webhook-service
+      namespace: system
+      path: /mutate-actions-summerwind-dev-v1alpha1-runnerreplicaset
+  failurePolicy: Fail
+  name: mutate.runnerreplicaset.actions.summerwind.dev
+  rules:
+  - apiGroups:
+    - actions.summerwind.dev
+    apiVersions:
+    - v1alpha1
+    operations:
+    - CREATE
+    - UPDATE
+    resources:
+    - runnerreplicasets
+
+---
+apiVersion: admissionregistration.k8s.io/v1beta1
+kind: ValidatingWebhookConfiguration
+metadata:
+  creationTimestamp: null
+  name: validating-webhook-configuration
+webhooks:
+- clientConfig:
+    caBundle: Cg==
+    service:
+      name: webhook-service
+      namespace: system
+      path: /validate-actions-summerwind-dev-v1alpha1-runner
+  failurePolicy: Fail
+  name: validate.runner.actions.summerwind.dev
+  rules:
+  - apiGroups:
+    - actions.summerwind.dev
+    apiVersions:
+    - v1alpha1
+    operations:
+    - CREATE
+    - UPDATE
+    resources:
+    - runners
+- clientConfig:
+    caBundle: Cg==
+    service:
+      name: webhook-service
+      namespace: system
+      path: /validate-actions-summerwind-dev-v1alpha1-runnerdeployment
+  failurePolicy: Fail
+  name: validate.runnerdeployment.actions.summerwind.dev
+  rules:
+  - apiGroups:
+    - actions.summerwind.dev
+    apiVersions:
+    - v1alpha1
+    operations:
+    - CREATE
+    - UPDATE
+    resources:
+    - runnerdeployments
+- clientConfig:
+    caBundle: Cg==
+    service:
+      name: webhook-service
+      namespace: system
+      path: /validate-actions-summerwind-dev-v1alpha1-runnerreplicaset
+  failurePolicy: Fail
+  name: validate.runnerreplicaset.actions.summerwind.dev
+  rules:
+  - apiGroups:
+    - actions.summerwind.dev
+    apiVersions:
+    - v1alpha1
+    operations:
+    - CREATE
+    - UPDATE
+    resources:
+    - runnerreplicasets

controllers/autoscaling.go

@@ -0,0 +1,104 @@
+package controllers
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"github.com/summerwind/actions-runner-controller/api/v1alpha1"
+	"strings"
+)
+
+func (r *HorizontalRunnerAutoscalerReconciler) determineDesiredReplicas(rd v1alpha1.RunnerDeployment, hra v1alpha1.HorizontalRunnerAutoscaler) (*int, error) {
+	if hra.Spec.MinReplicas == nil {
+		return nil, fmt.Errorf("horizontalrunnerautoscaler %s/%s is missing minReplicas", hra.Namespace, hra.Name)
+	} else if hra.Spec.MaxReplicas == nil {
+		return nil, fmt.Errorf("horizontalrunnerautoscaler %s/%s is missing maxReplicas", hra.Namespace, hra.Name)
+	}
+
+	var repos [][]string
+
+	repoID := rd.Spec.Template.Spec.Repository
+	if repoID == "" {
+		orgName := rd.Spec.Template.Spec.Organization
+		if orgName == "" {
+			return nil, fmt.Errorf("asserting runner deployment spec to detect bug: spec.template.organization should not be empty on this code path")
+		}
+
+		metrics := hra.Spec.Metrics
+
+		if len(metrics) == 0 {
+			return nil, fmt.Errorf("validating autoscaling metrics: one or more metrics is required")
+		} else if tpe := metrics[0].Type; tpe != v1alpha1.AutoscalingMetricTypeTotalNumberOfQueuedAndInProgressWorkflowRuns {
+			return nil, fmt.Errorf("validting autoscaling metrics: unsupported metric type %q: only supported value is %s", tpe, v1alpha1.AutoscalingMetricTypeTotalNumberOfQueuedAndInProgressWorkflowRuns)
+		} else if len(metrics[0].RepositoryNames) == 0 {
+			return nil, errors.New("validating autoscaling metrics: spec.autoscaling.metrics[].repositoryNames is required and must have one more more entries for organizational runner deployment")
+		}
+
+		for _, repoName := range metrics[0].RepositoryNames {
+			repos = append(repos, []string{orgName, repoName})
+		}
+	} else {
+		repo := strings.Split(repoID, "/")
+
+		repos = append(repos, repo)
+	}
+
+	var total, inProgress, queued, completed, unknown int
+
+	for _, repo := range repos {
+		user, repoName := repo[0], repo[1]
+		list, _, err := r.GitHubClient.Actions.ListRepositoryWorkflowRuns(context.TODO(), user, repoName, nil)
+		if err != nil {
+			return nil, err
+		}
+
+		for _, r := range list.WorkflowRuns {
+			total++
+
+			// In May 2020, there are only 3 statuses.
+			// Follow the below links for more details:
+			// - https://developer.github.com/v3/actions/workflow-runs/#list-repository-workflow-runs
+			// - https://developer.github.com/v3/checks/runs/#create-a-check-run
+			switch r.GetStatus() {
+			case "completed":
+				completed++
+			case "in_progress":
+				inProgress++
+			case "queued":
+				queued++
+			default:
+				unknown++
+			}
+		}
+	}
+
+	minReplicas := *hra.Spec.MinReplicas
+	maxReplicas := *hra.Spec.MaxReplicas
+	necessaryReplicas := queued + inProgress
+
+	var desiredReplicas int
+
+	if necessaryReplicas < minReplicas {
+		desiredReplicas = minReplicas
+	} else if necessaryReplicas > maxReplicas {
+		desiredReplicas = maxReplicas
+	} else {
+		desiredReplicas = necessaryReplicas
+	}
+
+	rd.Status.Replicas = &desiredReplicas
+	replicas := desiredReplicas
+
+	r.Log.V(1).Info(
+		"Calculated desired replicas",
+		"computed_replicas_desired", desiredReplicas,
+		"spec_replicas_min", minReplicas,
+		"spec_replicas_max", maxReplicas,
+		"workflow_runs_completed", completed,
+		"workflow_runs_in_progress", inProgress,
+		"workflow_runs_queued", queued,
+		"workflow_runs_unknown", unknown,
+	)
+
+	return &replicas, nil
+}

controllers/autoscaling_test.go

@@ -0,0 +1,399 @@
+package controllers
+
+import (
+	"fmt"
+	"github.com/summerwind/actions-runner-controller/api/v1alpha1"
+	"github.com/summerwind/actions-runner-controller/github"
+	"github.com/summerwind/actions-runner-controller/github/fake"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
+	"net/http/httptest"
+	"net/url"
+	"sigs.k8s.io/controller-runtime/pkg/log/zap"
+	"testing"
+)
+
+func newGithubClient(server *httptest.Server) *github.Client {
+	client, err := github.NewClientWithAccessToken("token")
+	if err != nil {
+		panic(err)
+	}
+
+	baseURL, err := url.Parse(server.URL + "/")
+	if err != nil {
+		panic(err)
+	}
+	client.Client.BaseURL = baseURL
+
+	return client
+}
+
+func TestDetermineDesiredReplicas_RepositoryRunner(t *testing.T) {
+	intPtr := func(v int) *int {
+		return &v
+	}
+
+	metav1Now := metav1.Now()
+	testcases := []struct {
+		repo         string
+		org          string
+		fixed        *int
+		max          *int
+		min          *int
+		sReplicas    *int
+		sTime        *metav1.Time
+		workflowRuns string
+		want         int
+		err          string
+	}{
+		// 3 demanded, max at 3
+		{
+			repo:         "test/valid",
+			min:          intPtr(2),
+			max:          intPtr(3),
+			workflowRuns: `{"total_count": 4, "workflow_runs":[{"status":"queued"}, {"status":"in_progress"}, {"status":"in_progress"}, {"status":"completed"}]}"`,
+			want:         3,
+		},
+		// 2 demanded, max at 3, currently 3, delay scaling down due to grace period
+		{
+			repo:         "test/valid",
+			min:          intPtr(2),
+			max:          intPtr(3),
+			sReplicas:    intPtr(3),
+			sTime:        &metav1Now,
+			workflowRuns: `{"total_count": 4, "workflow_runs":[{"status":"queued"}, {"status":"in_progress"}, {"status":"completed"}]}"`,
+			want:         3,
+		},
+		// 3 demanded, max at 2
+		{
+			repo:         "test/valid",
+			min:          intPtr(2),
+			max:          intPtr(2),
+			workflowRuns: `{"total_count": 4, "workflow_runs":[{"status":"queued"}, {"status":"in_progress"}, {"status":"in_progress"}, {"status":"completed"}]}"`,
+			want:         2,
+		},
+		// 2 demanded, min at 2
+		{
+			repo:         "test/valid",
+			min:          intPtr(2),
+			max:          intPtr(3),
+			workflowRuns: `{"total_count": 3, "workflow_runs":[{"status":"queued"}, {"status":"in_progress"}, {"status":"completed"}]}"`,
+			want:         2,
+		},
+		// 1 demanded, min at 2
+		{
+			repo:         "test/valid",
+			min:          intPtr(2),
+			max:          intPtr(3),
+			workflowRuns: `{"total_count": 2, "workflow_runs":[{"status":"queued"}, {"status":"completed"}]}"`,
+			want:         2,
+		},
+		// 1 demanded, min at 2
+		{
+			repo:         "test/valid",
+			min:          intPtr(2),
+			max:          intPtr(3),
+			workflowRuns: `{"total_count": 2, "workflow_runs":[{"status":"in_progress"}, {"status":"completed"}]}"`,
+			want:         2,
+		},
+		// 1 demanded, min at 1
+		{
+			repo:         "test/valid",
+			min:          intPtr(1),
+			max:          intPtr(3),
+			workflowRuns: `{"total_count": 2, "workflow_runs":[{"status":"queued"}, {"status":"completed"}]}"`,
+			want:         1,
+		},
+		// 1 demanded, min at 1
+		{
+			repo:         "test/valid",
+			min:          intPtr(1),
+			max:          intPtr(3),
+			workflowRuns: `{"total_count": 2, "workflow_runs":[{"status":"in_progress"}, {"status":"completed"}]}"`,
+			want:         1,
+		},
+		// fixed at 3
+		{
+			repo:         "test/valid",
+			min:          intPtr(1),
+			max:          intPtr(3),
+			fixed:        intPtr(3),
+			workflowRuns: `{"total_count": 4, "workflow_runs":[{"status":"in_progress"}, {"status":"in_progress"}, {"status":"in_progress"}, {"status":"completed"}]}"`,
+			want:         3,
+		},
+	}
+
+	for i := range testcases {
+		tc := testcases[i]
+
+		log := zap.New(func(o *zap.Options) {
+			o.Development = true
+		})
+
+		scheme := runtime.NewScheme()
+		_ = clientgoscheme.AddToScheme(scheme)
+		_ = v1alpha1.AddToScheme(scheme)
+
+		t.Run(fmt.Sprintf("case %d", i), func(t *testing.T) {
+			server := fake.NewServer(fake.WithListRepositoryWorkflowRunsResponse(200, tc.workflowRuns))
+			defer server.Close()
+			client := newGithubClient(server)
+
+			h := &HorizontalRunnerAutoscalerReconciler{
+				Log:          log,
+				GitHubClient: client,
+				Scheme:       scheme,
+			}
+
+			rd := v1alpha1.RunnerDeployment{
+				TypeMeta: metav1.TypeMeta{},
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "testrd",
+				},
+				Spec: v1alpha1.RunnerDeploymentSpec{
+					Template: v1alpha1.RunnerTemplate{
+						Spec: v1alpha1.RunnerSpec{
+							Repository: tc.repo,
+						},
+					},
+					Replicas: tc.fixed,
+				},
+				Status: v1alpha1.RunnerDeploymentStatus{
+					Replicas: tc.sReplicas,
+				},
+			}
+
+			hra := v1alpha1.HorizontalRunnerAutoscaler{
+				Spec: v1alpha1.HorizontalRunnerAutoscalerSpec{
+					MaxReplicas: tc.max,
+					MinReplicas: tc.min,
+				},
+				Status: v1alpha1.HorizontalRunnerAutoscalerStatus{
+					DesiredReplicas:            tc.sReplicas,
+					LastSuccessfulScaleOutTime: tc.sTime,
+				},
+			}
+
+			got, err := h.computeReplicas(rd, hra)
+			if err != nil {
+				if tc.err == "" {
+					t.Fatalf("unexpected error: expected none, got %v", err)
+				} else if err.Error() != tc.err {
+					t.Fatalf("unexpected error: expected %v, got %v", tc.err, err)
+				}
+				return
+			}
+
+			if got == nil {
+				t.Fatalf("unexpected value of rs.Spec.Replicas: nil")
+			}
+
+			if *got != tc.want {
+				t.Errorf("%d: incorrect desired replicas: want %d, got %d", i, tc.want, *got)
+			}
+		})
+	}
+}
+
+func TestDetermineDesiredReplicas_OrganizationalRunner(t *testing.T) {
+	intPtr := func(v int) *int {
+		return &v
+	}
+
+	metav1Now := metav1.Now()
+	testcases := []struct {
+		repos        []string
+		org          string
+		fixed        *int
+		max          *int
+		min          *int
+		sReplicas    *int
+		sTime        *metav1.Time
+		workflowRuns string
+		want         int
+		err          string
+	}{
+		// 3 demanded, max at 3
+		{
+			org:          "test",
+			repos:        []string{"valid"},
+			min:          intPtr(2),
+			max:          intPtr(3),
+			workflowRuns: `{"total_count": 4, "workflow_runs":[{"status":"queued"}, {"status":"in_progress"}, {"status":"in_progress"}, {"status":"completed"}]}"`,
+			want:         3,
+		},
+		// 2 demanded, max at 3, currently 3, delay scaling down due to grace period
+		{
+			org:          "test",
+			repos:        []string{"valid"},
+			min:          intPtr(2),
+			max:          intPtr(3),
+			sReplicas:    intPtr(3),
+			sTime:        &metav1Now,
+			workflowRuns: `{"total_count": 4, "workflow_runs":[{"status":"queued"}, {"status":"in_progress"}, {"status":"completed"}]}"`,
+			want:         3,
+		},
+		// 3 demanded, max at 2
+		{
+			org:          "test",
+			repos:        []string{"valid"},
+			min:          intPtr(2),
+			max:          intPtr(2),
+			workflowRuns: `{"total_count": 4, "workflow_runs":[{"status":"queued"}, {"status":"in_progress"}, {"status":"in_progress"}, {"status":"completed"}]}"`,
+			want:         2,
+		},
+		// 2 demanded, min at 2
+		{
+			org:          "test",
+			repos:        []string{"valid"},
+			min:          intPtr(2),
+			max:          intPtr(3),
+			workflowRuns: `{"total_count": 3, "workflow_runs":[{"status":"queued"}, {"status":"in_progress"}, {"status":"completed"}]}"`,
+			want:         2,
+		},
+		// 1 demanded, min at 2
+		{
+			org:          "test",
+			repos:        []string{"valid"},
+			min:          intPtr(2),
+			max:          intPtr(3),
+			workflowRuns: `{"total_count": 2, "workflow_runs":[{"status":"queued"}, {"status":"completed"}]}"`,
+			want:         2,
+		},
+		// 1 demanded, min at 2
+		{
+			org:          "test",
+			repos:        []string{"valid"},
+			min:          intPtr(2),
+			max:          intPtr(3),
+			workflowRuns: `{"total_count": 2, "workflow_runs":[{"status":"in_progress"}, {"status":"completed"}]}"`,
+			want:         2,
+		},
+		// 1 demanded, min at 1
+		{
+			org:          "test",
+			repos:        []string{"valid"},
+			min:          intPtr(1),
+			max:          intPtr(3),
+			workflowRuns: `{"total_count": 2, "workflow_runs":[{"status":"queued"}, {"status":"completed"}]}"`,
+			want:         1,
+		},
+		// 1 demanded, min at 1
+		{
+			org:          "test",
+			repos:        []string{"valid"},
+			min:          intPtr(1),
+			max:          intPtr(3),
+			workflowRuns: `{"total_count": 2, "workflow_runs":[{"status":"in_progress"}, {"status":"completed"}]}"`,
+			want:         1,
+		},
+		// fixed at 3
+		{
+			org:          "test",
+			repos:        []string{"valid"},
+			fixed:        intPtr(1),
+			min:          intPtr(1),
+			max:          intPtr(3),
+			workflowRuns: `{"total_count": 2, "workflow_runs":[{"status":"in_progress"}, {"status":"in_progress"}, {"status":"in_progress"}, {"status":"completed"}]}"`,
+			want:         3,
+		},
+		// org runner, fixed at 3
+		{
+			org:          "test",
+			repos:        []string{"valid"},
+			fixed:        intPtr(1),
+			min:          intPtr(1),
+			max:          intPtr(3),
+			workflowRuns: `{"total_count": 2, "workflow_runs":[{"status":"in_progress"}, {"status":"in_progress"}, {"status":"in_progress"}, {"status":"completed"}]}"`,
+			want:         3,
+		},
+		// org runner, 1 demanded, min at 1, no repos
+		{
+			org:          "test",
+			min:          intPtr(1),
+			max:          intPtr(3),
+			workflowRuns: `{"total_count": 2, "workflow_runs":[{"status":"in_progress"}, {"status":"completed"}]}"`,
+			err:          "validating autoscaling metrics: spec.autoscaling.metrics[].repositoryNames is required and must have one more more entries for organizational runner deployment",
+		},
+	}
+
+	for i := range testcases {
+		tc := testcases[i]
+
+		log := zap.New(func(o *zap.Options) {
+			o.Development = true
+		})
+
+		scheme := runtime.NewScheme()
+		_ = clientgoscheme.AddToScheme(scheme)
+		_ = v1alpha1.AddToScheme(scheme)
+
+		t.Run(fmt.Sprintf("case %d", i), func(t *testing.T) {
+			server := fake.NewServer(fake.WithListRepositoryWorkflowRunsResponse(200, tc.workflowRuns))
+			defer server.Close()
+			client := newGithubClient(server)
+
+			h := &HorizontalRunnerAutoscalerReconciler{
+				Log:          log,
+				Scheme:       scheme,
+				GitHubClient: client,
+			}
+
+			rd := v1alpha1.RunnerDeployment{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "testrd",
+				},
+				Spec: v1alpha1.RunnerDeploymentSpec{
+					Template: v1alpha1.RunnerTemplate{
+						Spec: v1alpha1.RunnerSpec{
+							Organization: tc.org,
+						},
+					},
+					Replicas: tc.fixed,
+				},
+				Status: v1alpha1.RunnerDeploymentStatus{
+					Replicas: tc.sReplicas,
+				},
+			}
+
+			hra := v1alpha1.HorizontalRunnerAutoscaler{
+				Spec: v1alpha1.HorizontalRunnerAutoscalerSpec{
+					ScaleTargetRef: v1alpha1.ScaleTargetRef{
+						Name: "testrd",
+					},
+					MaxReplicas: tc.max,
+					MinReplicas: tc.min,
+					Metrics: []v1alpha1.MetricSpec{
+						{
+							Type:            v1alpha1.AutoscalingMetricTypeTotalNumberOfQueuedAndInProgressWorkflowRuns,
+							RepositoryNames: tc.repos,
+						},
+					},
+				},
+				Status: v1alpha1.HorizontalRunnerAutoscalerStatus{
+					DesiredReplicas:            tc.sReplicas,
+					LastSuccessfulScaleOutTime: tc.sTime,
+				},
+			}
+
+			got, err := h.computeReplicas(rd, hra)
+			if err != nil {
+				if tc.err == "" {
+					t.Fatalf("unexpected error: expected none, got %v", err)
+				} else if err.Error() != tc.err {
+					t.Fatalf("unexpected error: expected %v, got %v", tc.err, err)
+				}
+				return
+			}
+
+			if got == nil {
+				t.Fatalf("unexpected value of rs.Spec.Replicas: nil, wanted %v", tc.want)
+			}
+
+			if *got != tc.want {
+				t.Errorf("%d: incorrect desired replicas: want %d, got %d", i, tc.want, *got)
+			}
+		})
+	}
+}

controllers/horizontalrunnerautoscaler_controller.go

@@ -0,0 +1,167 @@
+/*
+Copyright 2020 The actions-runner-controller authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controllers
+
+import (
+	"context"
+	"time"
+
+	"github.com/summerwind/actions-runner-controller/github"
+	"k8s.io/apimachinery/pkg/types"
+
+	"github.com/go-logr/logr"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/tools/record"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	"github.com/summerwind/actions-runner-controller/api/v1alpha1"
+)
+
+const (
+	DefaultScaleDownDelay = 10 * time.Minute
+)
+
+// HorizontalRunnerAutoscalerReconciler reconciles a HorizontalRunnerAutoscaler object
+type HorizontalRunnerAutoscalerReconciler struct {
+	client.Client
+	GitHubClient *github.Client
+	Log          logr.Logger
+	Recorder     record.EventRecorder
+	Scheme       *runtime.Scheme
+}
+
+// +kubebuilder:rbac:groups=actions.summerwind.dev,resources=runnerdeployments,verbs=get;list;watch;update;patch
+// +kubebuilder:rbac:groups=actions.summerwind.dev,resources=horizontalrunnerautoscalers,verbs=get;list;watch;create;update;patch;delete
+// +kubebuilder:rbac:groups=actions.summerwind.dev,resources=horizontalrunnerautoscalers/status,verbs=get;update;patch
+// +kubebuilder:rbac:groups=core,resources=events,verbs=create;patch
+
+func (r *HorizontalRunnerAutoscalerReconciler) Reconcile(req ctrl.Request) (ctrl.Result, error) {
+	ctx := context.Background()
+	log := r.Log.WithValues("horizontalrunnerautoscaler", req.NamespacedName)
+
+	var hra v1alpha1.HorizontalRunnerAutoscaler
+	if err := r.Get(ctx, req.NamespacedName, &hra); err != nil {
+		return ctrl.Result{}, client.IgnoreNotFound(err)
+	}
+
+	if !hra.ObjectMeta.DeletionTimestamp.IsZero() {
+		return ctrl.Result{}, nil
+	}
+
+	var rd v1alpha1.RunnerDeployment
+	if err := r.Get(ctx, types.NamespacedName{
+		Namespace: req.Namespace,
+		Name:      hra.Spec.ScaleTargetRef.Name,
+	}, &rd); err != nil {
+		return ctrl.Result{}, client.IgnoreNotFound(err)
+	}
+
+	if !rd.ObjectMeta.DeletionTimestamp.IsZero() {
+		return ctrl.Result{}, nil
+	}
+
+	replicas, err := r.computeReplicas(rd, hra)
+	if err != nil {
+		r.Recorder.Event(&hra, corev1.EventTypeNormal, "RunnerAutoscalingFailure", err.Error())
+
+		log.Error(err, "Could not compute replicas")
+
+		return ctrl.Result{}, err
+	}
+
+	const defaultReplicas = 1
+
+	currentDesiredReplicas := getIntOrDefault(rd.Spec.Replicas, defaultReplicas)
+	newDesiredReplicas := getIntOrDefault(replicas, defaultReplicas)
+
+	// Please add more conditions that we can in-place update the newest runnerreplicaset without disruption
+	if currentDesiredReplicas != newDesiredReplicas {
+		copy := rd.DeepCopy()
+		copy.Spec.Replicas = &newDesiredReplicas
+
+		if err := r.Client.Update(ctx, copy); err != nil {
+			log.Error(err, "Failed to update runnerderployment resource")
+
+			return ctrl.Result{}, err
+		}
+
+		return ctrl.Result{}, err
+	}
+
+	if hra.Status.DesiredReplicas == nil || *hra.Status.DesiredReplicas != *replicas {
+		updated := hra.DeepCopy()
+
+		if (hra.Status.DesiredReplicas == nil && *replicas > 1) ||
+			(hra.Status.DesiredReplicas != nil && *replicas > *hra.Status.DesiredReplicas) {
+
+			updated.Status.LastSuccessfulScaleOutTime = &metav1.Time{Time: time.Now()}
+		}
+
+		updated.Status.DesiredReplicas = replicas
+
+		if err := r.Status().Update(ctx, updated); err != nil {
+			log.Error(err, "Failed to update horizontalrunnerautoscaler status")
+
+			return ctrl.Result{}, err
+		}
+	}
+
+	return ctrl.Result{}, nil
+}
+
+func (r *HorizontalRunnerAutoscalerReconciler) SetupWithManager(mgr ctrl.Manager) error {
+	r.Recorder = mgr.GetEventRecorderFor("horizontalrunnerautoscaler-controller")
+
+	return ctrl.NewControllerManagedBy(mgr).
+		For(&v1alpha1.HorizontalRunnerAutoscaler{}).
+		Complete(r)
+}
+
+func (r *HorizontalRunnerAutoscalerReconciler) computeReplicas(rd v1alpha1.RunnerDeployment, hra v1alpha1.HorizontalRunnerAutoscaler) (*int, error) {
+	var computedReplicas *int
+
+	replicas, err := r.determineDesiredReplicas(rd, hra)
+	if err != nil {
+		return nil, err
+	}
+
+	var scaleDownDelay time.Duration
+
+	if hra.Spec.ScaleDownDelaySecondsAfterScaleUp != nil {
+		scaleDownDelay = time.Duration(*hra.Spec.ScaleDownDelaySecondsAfterScaleUp) * time.Second
+	} else {
+		scaleDownDelay = DefaultScaleDownDelay
+	}
+
+	now := time.Now()
+
+	if hra.Status.DesiredReplicas == nil ||
+		*hra.Status.DesiredReplicas < *replicas ||
+		hra.Status.LastSuccessfulScaleOutTime == nil ||
+		hra.Status.LastSuccessfulScaleOutTime.Add(scaleDownDelay).Before(now) {
+
+		computedReplicas = replicas
+	} else {
+		computedReplicas = hra.Status.DesiredReplicas
+	}
+
+	return computedReplicas, nil
+}

controllers/integration_test.go

@@ -0,0 +1,254 @@
+package controllers
+
+import (
+	"context"
+	"github.com/summerwind/actions-runner-controller/github/fake"
+	"time"
+
+	corev1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/client-go/kubernetes/scheme"
+	ctrl "sigs.k8s.io/controller-runtime"
+	logf "sigs.k8s.io/controller-runtime/pkg/log"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+
+	actionsv1alpha1 "github.com/summerwind/actions-runner-controller/api/v1alpha1"
+)
+
+// SetupIntegrationTest will set up a testing environment.
+// This includes:
+// * creating a Namespace to be used during the test
+// * starting all the reconcilers
+// * stopping all the reconcilers after the test ends
+// Call this function at the start of each of your tests.
+func SetupIntegrationTest(ctx context.Context) *corev1.Namespace {
+	var stopCh chan struct{}
+	ns := &corev1.Namespace{}
+
+	workflowRuns := `{"total_count": 5, "workflow_runs":[{"status":"queued"}, {"status":"queued"}, {"status":"in_progress"}, {"status":"in_progress"}, {"status":"completed"}]}"`
+	server := fake.NewServer(fake.WithListRepositoryWorkflowRunsResponse(200, workflowRuns))
+
+	BeforeEach(func() {
+		stopCh = make(chan struct{})
+		*ns = corev1.Namespace{
+			ObjectMeta: metav1.ObjectMeta{Name: "testns-" + randStringRunes(5)},
+		}
+
+		err := k8sClient.Create(ctx, ns)
+		Expect(err).NotTo(HaveOccurred(), "failed to create test namespace")
+
+		mgr, err := ctrl.NewManager(cfg, ctrl.Options{})
+		Expect(err).NotTo(HaveOccurred(), "failed to create manager")
+
+		replicasetController := &RunnerReplicaSetReconciler{
+			Client:   mgr.GetClient(),
+			Scheme:   scheme.Scheme,
+			Log:      logf.Log,
+			Recorder: mgr.GetEventRecorderFor("runnerreplicaset-controller"),
+		}
+		err = replicasetController.SetupWithManager(mgr)
+		Expect(err).NotTo(HaveOccurred(), "failed to setup controller")
+
+		deploymentsController := &RunnerDeploymentReconciler{
+			Client:   mgr.GetClient(),
+			Scheme:   scheme.Scheme,
+			Log:      logf.Log,
+			Recorder: mgr.GetEventRecorderFor("runnerdeployment-controller"),
+		}
+		err = deploymentsController.SetupWithManager(mgr)
+		Expect(err).NotTo(HaveOccurred(), "failed to setup controller")
+
+		client := newGithubClient(server)
+
+		autoscalerController := &HorizontalRunnerAutoscalerReconciler{
+			Client:       mgr.GetClient(),
+			Scheme:       scheme.Scheme,
+			Log:          logf.Log,
+			GitHubClient: client,
+			Recorder:     mgr.GetEventRecorderFor("horizontalrunnerautoscaler-controller"),
+		}
+		err = autoscalerController.SetupWithManager(mgr)
+		Expect(err).NotTo(HaveOccurred(), "failed to setup controller")
+
+		go func() {
+			defer GinkgoRecover()
+
+			err := mgr.Start(stopCh)
+			Expect(err).NotTo(HaveOccurred(), "failed to start manager")
+		}()
+	})
+
+	AfterEach(func() {
+		close(stopCh)
+
+		server.Close()
+
+		err := k8sClient.Delete(ctx, ns)
+		Expect(err).NotTo(HaveOccurred(), "failed to delete test namespace")
+	})
+
+	return ns
+}
+
+var _ = Context("Inside of a new namespace", func() {
+	ctx := context.TODO()
+	ns := SetupIntegrationTest(ctx)
+
+	Describe("when no existing resources exist", func() {
+
+		It("should create and scale runners", func() {
+			name := "example-runnerdeploy"
+
+			{
+				rs := &actionsv1alpha1.RunnerDeployment{
+					ObjectMeta: metav1.ObjectMeta{
+						Name:      name,
+						Namespace: ns.Name,
+					},
+					Spec: actionsv1alpha1.RunnerDeploymentSpec{
+						Replicas: intPtr(1),
+						Template: actionsv1alpha1.RunnerTemplate{
+							Spec: actionsv1alpha1.RunnerSpec{
+								Repository: "test/valid",
+								Image:      "bar",
+								Env: []corev1.EnvVar{
+									{Name: "FOO", Value: "FOOVALUE"},
+								},
+							},
+						},
+					},
+				}
+
+				err := k8sClient.Create(ctx, rs)
+
+				Expect(err).NotTo(HaveOccurred(), "failed to create test RunnerDeployment resource")
+
+				runnerSets := actionsv1alpha1.RunnerReplicaSetList{Items: []actionsv1alpha1.RunnerReplicaSet{}}
+
+				Eventually(
+					func() int {
+						err := k8sClient.List(ctx, &runnerSets, client.InNamespace(ns.Name))
+						if err != nil {
+							logf.Log.Error(err, "list runner sets")
+						}
+
+						return len(runnerSets.Items)
+					},
+					time.Second*5, time.Millisecond*500).Should(BeEquivalentTo(1))
+
+				Eventually(
+					func() int {
+						err := k8sClient.List(ctx, &runnerSets, client.InNamespace(ns.Name))
+						if err != nil {
+							logf.Log.Error(err, "list runner sets")
+						}
+
+						if len(runnerSets.Items) == 0 {
+							logf.Log.Info("No runnerreplicasets exist yet")
+							return -1
+						}
+
+						return *runnerSets.Items[0].Spec.Replicas
+					},
+					time.Second*5, time.Millisecond*500).Should(BeEquivalentTo(1))
+			}
+
+			{
+				// We wrap the update in the Eventually block to avoid the below error that occurs due to concurrent modification
+				// made by the controller to update .Status.AvailableReplicas and .Status.ReadyReplicas
+				//   Operation cannot be fulfilled on runnersets.actions.summerwind.dev "example-runnerset": the object has been modified; please apply your changes to the latest version and try again
+				Eventually(func() error {
+					var rd actionsv1alpha1.RunnerDeployment
+
+					err := k8sClient.Get(ctx, types.NamespacedName{Namespace: ns.Name, Name: name}, &rd)
+
+					Expect(err).NotTo(HaveOccurred(), "failed to get test RunnerDeployment resource")
+
+					rd.Spec.Replicas = intPtr(2)
+
+					return k8sClient.Update(ctx, &rd)
+				},
+					time.Second*1, time.Millisecond*500).Should(BeNil())
+
+				runnerSets := actionsv1alpha1.RunnerReplicaSetList{Items: []actionsv1alpha1.RunnerReplicaSet{}}
+
+				Eventually(
+					func() int {
+						err := k8sClient.List(ctx, &runnerSets, client.InNamespace(ns.Name))
+						if err != nil {
+							logf.Log.Error(err, "list runner sets")
+						}
+
+						return len(runnerSets.Items)
+					},
+					time.Second*5, time.Millisecond*500).Should(BeEquivalentTo(1))
+
+				Eventually(
+					func() int {
+						err := k8sClient.List(ctx, &runnerSets, client.InNamespace(ns.Name))
+						if err != nil {
+							logf.Log.Error(err, "list runner sets")
+						}
+
+						return *runnerSets.Items[0].Spec.Replicas
+					},
+					time.Second*5, time.Millisecond*500).Should(BeEquivalentTo(2))
+			}
+
+			{
+				rs := &actionsv1alpha1.HorizontalRunnerAutoscaler{
+					ObjectMeta: metav1.ObjectMeta{
+						Name:      name,
+						Namespace: ns.Name,
+					},
+					Spec: actionsv1alpha1.HorizontalRunnerAutoscalerSpec{
+						ScaleTargetRef: actionsv1alpha1.ScaleTargetRef{
+							Name: name,
+						},
+						MinReplicas:                       intPtr(1),
+						MaxReplicas:                       intPtr(3),
+						ScaleDownDelaySecondsAfterScaleUp: nil,
+						Metrics:                           nil,
+					},
+				}
+
+				err := k8sClient.Create(ctx, rs)
+
+				Expect(err).NotTo(HaveOccurred(), "failed to create test RunnerDeployment resource")
+
+				runnerSets := actionsv1alpha1.RunnerReplicaSetList{Items: []actionsv1alpha1.RunnerReplicaSet{}}
+
+				Eventually(
+					func() int {
+						err := k8sClient.List(ctx, &runnerSets, client.InNamespace(ns.Name))
+						if err != nil {
+							logf.Log.Error(err, "list runner sets")
+						}
+
+						return len(runnerSets.Items)
+					},
+					time.Second*5, time.Millisecond*500).Should(BeEquivalentTo(1))
+
+				Eventually(
+					func() int {
+						err := k8sClient.List(ctx, &runnerSets, client.InNamespace(ns.Name))
+						if err != nil {
+							logf.Log.Error(err, "list runner sets")
+						}
+
+						if len(runnerSets.Items) == 0 {
+							logf.Log.Info("No runnerreplicasets exist yet")
+							return -1
+						}
+
+						return *runnerSets.Items[0].Spec.Replicas
+					},
+					time.Second*5, time.Millisecond*500).Should(BeEquivalentTo(3))
+			}
+		})
+	})
+})

controllers/runner_controller.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	"fmt"
 	"reflect"
+	"strings"
 
 	"github.com/go-logr/logr"
 	"k8s.io/apimachinery/pkg/api/errors"
@@ -65,6 +66,12 @@ func (r *RunnerReconciler) Reconcile(req ctrl.Request) (ctrl.Result, error) {
 		return ctrl.Result{}, client.IgnoreNotFound(err)
 	}
 
+	err := runner.Validate()
+	if err != nil {
+		log.Info("Failed to validate runner spec", "error", err.Error())
+		return ctrl.Result{}, nil
+	}
+
 	if runner.ObjectMeta.DeletionTimestamp.IsZero() {
 		finalizers, added := addFinalizer(runner.ObjectMeta.Finalizers)
 
@@ -83,14 +90,18 @@ func (r *RunnerReconciler) Reconcile(req ctrl.Request) (ctrl.Result, error) {
 		finalizers, removed := removeFinalizer(runner.ObjectMeta.Finalizers)
 
 		if removed {
-			ok, err := r.unregisterRunner(ctx, runner.Spec.Repository, runner.Name)
-			if err != nil {
-				log.Error(err, "Failed to unregister runner")
-				return ctrl.Result{}, err
-			}
+			if len(runner.Status.Registration.Token) > 0 {
+				ok, err := r.unregisterRunner(ctx, runner.Spec.Organization, runner.Spec.Repository, runner.Name)
+				if err != nil {
+					log.Error(err, "Failed to unregister runner")
+					return ctrl.Result{}, err
+				}
 
-			if !ok {
-				log.V(1).Info("Runner no longer exists on GitHub")
+				if !ok {
+					log.V(1).Info("Runner no longer exists on GitHub")
+				}
+			} else {
+				log.V(1).Info("Runner was never registered on GitHub")
 			}
 
 			newRunner := runner.DeepCopy()
@@ -101,14 +112,14 @@ func (r *RunnerReconciler) Reconcile(req ctrl.Request) (ctrl.Result, error) {
 				return ctrl.Result{}, err
 			}
 
-			log.Info("Removed runner from GitHub", "repository", runner.Spec.Repository)
+			log.Info("Removed runner from GitHub", "repository", runner.Spec.Repository, "organization", runner.Spec.Organization)
 		}
 
 		return ctrl.Result{}, nil
 	}
 
 	if !runner.IsRegisterable() {
-		rt, err := r.GitHubClient.GetRegistrationToken(ctx, runner.Spec.Repository, runner.Name)
+		rt, err := r.GitHubClient.GetRegistrationToken(ctx, runner.Spec.Organization, runner.Spec.Repository, runner.Name)
 		if err != nil {
 			r.Recorder.Event(&runner, corev1.EventTypeWarning, "FailedUpdateRegistrationToken", "Updating registration token failed")
 			log.Error(err, "Failed to get new registration token")
@@ -117,9 +128,11 @@ func (r *RunnerReconciler) Reconcile(req ctrl.Request) (ctrl.Result, error) {
 
 		updated := runner.DeepCopy()
 		updated.Status.Registration = v1alpha1.RunnerStatusRegistration{
-			Repository: runner.Spec.Repository,
-			Token:      rt.GetToken(),
-			ExpiresAt:  metav1.NewTime(rt.GetExpiresAt().Time),
+			Organization: runner.Spec.Organization,
+			Repository:   runner.Spec.Repository,
+			Labels:       runner.Spec.Labels,
+			Token:        rt.GetToken(),
+			ExpiresAt:    metav1.NewTime(rt.GetExpiresAt().Time),
 		}
 
 		if err := r.Status().Update(ctx, updated); err != nil {
@@ -212,8 +225,8 @@ func (r *RunnerReconciler) Reconcile(req ctrl.Request) (ctrl.Result, error) {
 	return ctrl.Result{}, nil
 }
 
-func (r *RunnerReconciler) unregisterRunner(ctx context.Context, repo, name string) (bool, error) {
-	runners, err := r.GitHubClient.ListRunners(ctx, repo)
+func (r *RunnerReconciler) unregisterRunner(ctx context.Context, org, repo, name string) (bool, error) {
+	runners, err := r.GitHubClient.ListRunners(ctx, org, repo)
 	if err != nil {
 		return false, err
 	}
@@ -230,7 +243,7 @@ func (r *RunnerReconciler) unregisterRunner(ctx context.Context, repo, name stri
 		return false, nil
 	}
 
-	if err := r.GitHubClient.RemoveRunner(ctx, repo, id); err != nil {
+	if err := r.GitHubClient.RemoveRunner(ctx, org, repo, id); err != nil {
 		return false, err
 	}
 
@@ -248,15 +261,28 @@ func (r *RunnerReconciler) newPod(runner v1alpha1.Runner) (corev1.Pod, error) {
 		runnerImage = r.RunnerImage
 	}
 
+	runnerImagePullPolicy := runner.Spec.ImagePullPolicy
+	if runnerImagePullPolicy == "" {
+		runnerImagePullPolicy = corev1.PullAlways
+	}
+
 	env := []corev1.EnvVar{
 		{
 			Name:  "RUNNER_NAME",
 			Value: runner.Name,
 		},
+		{
+			Name:  "RUNNER_ORG",
+			Value: runner.Spec.Organization,
+		},
 		{
 			Name:  "RUNNER_REPO",
 			Value: runner.Spec.Repository,
 		},
+		{
+			Name:  "RUNNER_LABELS",
+			Value: strings.Join(runner.Spec.Labels, ","),
+		},
 		{
 			Name:  "RUNNER_TOKEN",
 			Value: runner.Status.Registration.Token,
@@ -277,7 +303,7 @@ func (r *RunnerReconciler) newPod(runner v1alpha1.Runner) (corev1.Pod, error) {
 				{
 					Name:            containerName,
 					Image:           runnerImage,
-					ImagePullPolicy: "Always",
+					ImagePullPolicy: runnerImagePullPolicy,
 					Env:             env,
 					EnvFrom:         runner.Spec.EnvFrom,
 					VolumeMounts: []corev1.VolumeMount{
@@ -339,7 +365,7 @@ func (r *RunnerReconciler) newPod(runner v1alpha1.Runner) (corev1.Pod, error) {
 	}
 
 	if len(runner.Spec.Volumes) != 0 {
-		pod.Spec.Volumes = append(runner.Spec.Volumes, runner.Spec.Volumes...)
+		pod.Spec.Volumes = append(pod.Spec.Volumes, runner.Spec.Volumes...)
 	}
 	if len(runner.Spec.InitContainers) != 0 {
 		pod.Spec.InitContainers = append(pod.Spec.InitContainers, runner.Spec.InitContainers...)

controllers/runnerdeployment_controller.go

@@ -20,10 +20,11 @@ import (
 	"context"
 	"fmt"
 	"hash/fnv"
-	"k8s.io/apimachinery/pkg/types"
 	"sort"
 	"time"
 
+	"k8s.io/apimachinery/pkg/types"
+
 	"github.com/davecgh/go-spew/spew"
 	"github.com/go-logr/logr"
 	"k8s.io/apimachinery/pkg/runtime"
@@ -96,13 +97,15 @@ func (r *RunnerDeploymentReconciler) Reconcile(req ctrl.Request) (ctrl.Result, e
 
 	desiredRS, err := r.newRunnerReplicaSet(rd)
 	if err != nil {
+		r.Recorder.Event(&rd, corev1.EventTypeNormal, "RunnerAutoscalingFailure", err.Error())
+
 		log.Error(err, "Could not create runnerreplicaset")
 
 		return ctrl.Result{}, err
 	}
 
 	if newestSet == nil {
-		if err := r.Client.Create(ctx, &desiredRS); err != nil {
+		if err := r.Client.Create(ctx, desiredRS); err != nil {
 			log.Error(err, "Failed to create runnerreplicaset resource")
 
 			return ctrl.Result{}, err
@@ -118,7 +121,7 @@ func (r *RunnerDeploymentReconciler) Reconcile(req ctrl.Request) (ctrl.Result, e
 		return ctrl.Result{}, nil
 	}
 
-	desiredTemplateHash, ok := getTemplateHash(&desiredRS)
+	desiredTemplateHash, ok := getTemplateHash(desiredRS)
 	if !ok {
 		log.Info("Failed to get template hash of desired runnerreplicaset resource. It must be in an invalid state. Please manually delete the runnerreplicaset so that it is recreated")
 
@@ -126,7 +129,7 @@ func (r *RunnerDeploymentReconciler) Reconcile(req ctrl.Request) (ctrl.Result, e
 	}
 
 	if newestTemplateHash != desiredTemplateHash {
-		if err := r.Client.Create(ctx, &desiredRS); err != nil {
+		if err := r.Client.Create(ctx, desiredRS); err != nil {
 			log.Error(err, "Failed to create runnerreplicaset resource")
 
 			return ctrl.Result{}, err
@@ -184,6 +187,17 @@ func (r *RunnerDeploymentReconciler) Reconcile(req ctrl.Request) (ctrl.Result, e
 		}
 	}
 
+	if rd.Spec.Replicas == nil && desiredRS.Spec.Replicas != nil {
+		updated := rd.DeepCopy()
+		updated.Status.Replicas = desiredRS.Spec.Replicas
+
+		if err := r.Status().Update(ctx, updated); err != nil {
+			log.Error(err, "Failed to update runnerdeployment status")
+
+			return ctrl.Result{}, err
+		}
+	}
+
 	return ctrl.Result{}, nil
 }
 
@@ -241,7 +255,7 @@ func CloneAndAddLabel(labels map[string]string, labelKey, labelValue string) map
 	return newLabels
 }
 
-func (r *RunnerDeploymentReconciler) newRunnerReplicaSet(rd v1alpha1.RunnerDeployment) (v1alpha1.RunnerReplicaSet, error) {
+func (r *RunnerDeploymentReconciler) newRunnerReplicaSet(rd v1alpha1.RunnerDeployment) (*v1alpha1.RunnerReplicaSet, error) {
 	newRSTemplate := *rd.Spec.Template.DeepCopy()
 	templateHash := ComputeHash(&newRSTemplate)
 	// Add template hash label to selector.
@@ -263,10 +277,10 @@ func (r *RunnerDeploymentReconciler) newRunnerReplicaSet(rd v1alpha1.RunnerDeplo
 	}
 
 	if err := ctrl.SetControllerReference(&rd, &rs, r.Scheme); err != nil {
-		return rs, err
+		return &rs, err
 	}
 
-	return rs, nil
+	return &rs, nil
 }
 
 func (r *RunnerDeploymentReconciler) SetupWithManager(mgr ctrl.Manager) error {

github/fake/fake.go

@@ -31,7 +31,14 @@ func (h *handler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	fmt.Fprintf(w, h.Body)
 }
 
-func NewServer() *httptest.Server {
+// NewServer creates a fake server for running unit tests
+func NewServer(opts ...Option) *httptest.Server {
+	var responses FixedResponses
+
+	for _, o := range opts {
+		o(&responses)
+	}
+
 	routes := map[string]handler{
 		// For CreateRegistrationToken
 		"/repos/test/valid/actions/runners/registration-token": handler{
@@ -46,6 +53,18 @@ func NewServer() *httptest.Server {
 			Status: http.StatusBadRequest,
 			Body:   "",
 		},
+		"/orgs/test/actions/runners/registration-token": handler{
+			Status: http.StatusCreated,
+			Body:   fmt.Sprintf("{\"token\": \"%s\", \"expires_at\": \"%s\"}", RegistrationToken, time.Now().Add(time.Hour*1).Format(time.RFC3339)),
+		},
+		"/orgs/invalid/actions/runners/registration-token": handler{
+			Status: http.StatusOK,
+			Body:   fmt.Sprintf("{\"token\": \"%s\", \"expires_at\": \"%s\"}", RegistrationToken, time.Now().Add(time.Hour*1).Format(time.RFC3339)),
+		},
+		"/orgs/error/actions/runners/registration-token": handler{
+			Status: http.StatusBadRequest,
+			Body:   "",
+		},
 
 		// For ListRunners
 		"/repos/test/valid/actions/runners": handler{
@@ -60,6 +79,18 @@ func NewServer() *httptest.Server {
 			Status: http.StatusBadRequest,
 			Body:   "",
 		},
+		"/orgs/test/actions/runners": handler{
+			Status: http.StatusOK,
+			Body:   RunnersListBody,
+		},
+		"/orgs/invalid/actions/runners": handler{
+			Status: http.StatusNoContent,
+			Body:   "",
+		},
+		"/orgs/error/actions/runners": handler{
+			Status: http.StatusBadRequest,
+			Body:   "",
+		},
 
 		// For RemoveRunner
 		"/repos/test/valid/actions/runners/1": handler{
@@ -74,6 +105,21 @@ func NewServer() *httptest.Server {
 			Status: http.StatusBadRequest,
 			Body:   "",
 		},
+		"/orgs/test/actions/runners/1": handler{
+			Status: http.StatusNoContent,
+			Body:   "",
+		},
+		"/orgs/invalid/actions/runners/1": handler{
+			Status: http.StatusOK,
+			Body:   "",
+		},
+		"/orgs/error/actions/runners/1": handler{
+			Status: http.StatusBadRequest,
+			Body:   "",
+		},
+
+		// For auto-scaling based on the number of queued(pending) workflow runs
+		"/repos/test/valid/actions/runs": responses.listRepositoryWorkflowRuns.handler(),
 	}
 
 	mux := http.NewServeMux()

github/fake/options.go

@@ -0,0 +1,28 @@
+package fake
+
+type FixedResponses struct {
+	listRepositoryWorkflowRuns FixedResponse
+}
+
+type FixedResponse struct {
+	Status int
+	Body   string
+}
+
+func (r FixedResponse) handler() handler {
+	return handler{
+		Status: r.Status,
+		Body:   r.Body,
+	}
+}
+
+type Option func(responses *FixedResponses)
+
+func WithListRepositoryWorkflowRunsResponse(status int, body string) Option {
+	return func(r *FixedResponses) {
+		r.listRepositoryWorkflowRuns = FixedResponse{
+			Status: status,
+			Body:   body,
+		}
+	}
+}

github/github.go

@@ -2,7 +2,6 @@ package github
 
 import (
 	"context"
-	"errors"
 	"fmt"
 	"net/http"
 	"strings"
@@ -14,6 +13,7 @@ import (
 	"golang.org/x/oauth2"
 )
 
+// Client wraps GitHub client with some additional
 type Client struct {
 	*github.Client
 	regTokens map[string]*github.RegistrationToken
@@ -27,14 +27,16 @@ func NewClient(appID, installationID int64, privateKeyPath string) (*Client, err
 		return nil, fmt.Errorf("authentication failed: %v", err)
 	}
 
+	gh := github.NewClient(&http.Client{Transport: tr})
+
 	return &Client{
-		Client:    github.NewClient(&http.Client{Transport: tr}),
+		Client:    gh,
 		regTokens: map[string]*github.RegistrationToken{},
 		mu:        sync.Mutex{},
 	}, nil
 }
 
-// NewClient returns a client authenticated with personal access token.
+// NewClientWithAccessToken returns a client authenticated with personal access token.
 func NewClientWithAccessToken(token string) (*Client, error) {
 	tc := oauth2.NewClient(context.Background(), oauth2.StaticTokenSource(
 		&oauth2.Token{AccessToken: token},
@@ -48,22 +50,25 @@ func NewClientWithAccessToken(token string) (*Client, error) {
 }
 
 // GetRegistrationToken returns a registration token tied with the name of repository and runner.
-func (c *Client) GetRegistrationToken(ctx context.Context, repository, name string) (*github.RegistrationToken, error) {
+func (c *Client) GetRegistrationToken(ctx context.Context, org, repo, name string) (*github.RegistrationToken, error) {
 	c.mu.Lock()
 	defer c.mu.Unlock()
 
-	owner, repo, err := splitOwnerAndRepo(repository)
-	if err != nil {
-		return nil, err
-	}
-
-	key := fmt.Sprintf("%s/%s", repo, name)
+	key := getRegistrationKey(org, repo)
 	rt, ok := c.regTokens[key]
+
 	if ok && rt.GetExpiresAt().After(time.Now().Add(-10*time.Minute)) {
 		return rt, nil
 	}
 
-	rt, res, err := c.Client.Actions.CreateRegistrationToken(ctx, owner, repo)
+	owner, repo, err := getOwnerAndRepo(org, repo)
+
+	if err != nil {
+		return rt, err
+	}
+
+	rt, res, err := c.createRegistrationToken(ctx, owner, repo)
+
 	if err != nil {
 		return nil, fmt.Errorf("failed to create registration token: %v", err)
 	}
@@ -81,13 +86,15 @@ func (c *Client) GetRegistrationToken(ctx context.Context, repository, name stri
 }
 
 // RemoveRunner removes a runner with specified runner ID from repocitory.
-func (c *Client) RemoveRunner(ctx context.Context, repository string, runnerID int64) error {
-	owner, repo, err := splitOwnerAndRepo(repository)
+func (c *Client) RemoveRunner(ctx context.Context, org, repo string, runnerID int64) error {
+	owner, repo, err := getOwnerAndRepo(org, repo)
+
 	if err != nil {
 		return err
 	}
 
-	res, err := c.Client.Actions.RemoveRunner(ctx, owner, repo, runnerID)
+	res, err := c.removeRunner(ctx, owner, repo, runnerID)
+
 	if err != nil {
 		return fmt.Errorf("failed to remove runner: %v", err)
 	}
@@ -99,18 +106,20 @@ func (c *Client) RemoveRunner(ctx context.Context, repository string, runnerID i
 	return nil
 }
 
-// ListRunners returns a list of runners of specified repository name.
-func (c *Client) ListRunners(ctx context.Context, repository string) ([]*github.Runner, error) {
-	var runners []*github.Runner
+// ListRunners returns a list of runners of specified owner/repository name.
+func (c *Client) ListRunners(ctx context.Context, org, repo string) ([]*github.Runner, error) {
+	owner, repo, err := getOwnerAndRepo(org, repo)
 
-	owner, repo, err := splitOwnerAndRepo(repository)
 	if err != nil {
-		return runners, err
+		return nil, err
 	}
 
+	var runners []*github.Runner
+
 	opts := github.ListOptions{PerPage: 10}
 	for {
-		list, res, err := c.Client.Actions.ListRunners(ctx, owner, repo, &opts)
+		list, res, err := c.listRunners(ctx, owner, repo, &opts)
+
 		if err != nil {
 			return runners, fmt.Errorf("failed to remove runner: %v", err)
 		}
@@ -137,11 +146,56 @@ func (c *Client) cleanup() {
 	}
 }
 
-// splitOwnerAndRepo splits specified repository name to the owner and repo name.
+// wrappers for github functions (switch between organization/repository mode)
+// so the calling functions don't need to switch and their code is a bit cleaner
+
+func (c *Client) createRegistrationToken(ctx context.Context, owner, repo string) (*github.RegistrationToken, *github.Response, error) {
+	if len(repo) > 0 {
+		return c.Client.Actions.CreateRegistrationToken(ctx, owner, repo)
+	} else {
+		return CreateOrganizationRegistrationToken(ctx, c, owner)
+	}
+}
+
+func (c *Client) removeRunner(ctx context.Context, owner, repo string, runnerID int64) (*github.Response, error) {
+	if len(repo) > 0 {
+		return c.Client.Actions.RemoveRunner(ctx, owner, repo, runnerID)
+	} else {
+		return RemoveOrganizationRunner(ctx, c, owner, runnerID)
+	}
+}
+
+func (c *Client) listRunners(ctx context.Context, owner, repo string, opts *github.ListOptions) (*github.Runners, *github.Response, error) {
+	if len(repo) > 0 {
+		return c.Client.Actions.ListRunners(ctx, owner, repo, opts)
+	} else {
+		return ListOrganizationRunners(ctx, c, owner, opts)
+	}
+}
+
+// Validates owner and repo arguments. Both are optional, but at least one should be specified
+func getOwnerAndRepo(org, repo string) (string, string, error) {
+	if len(repo) > 0 {
+		return splitOwnerAndRepo(repo)
+	}
+	if len(org) > 0 {
+		return org, "", nil
+	}
+	return "", "", fmt.Errorf("organization and repository are both empty")
+}
+
+func getRegistrationKey(org, repo string) string {
+	if len(org) > 0 {
+		return org
+	} else {
+		return repo
+	}
+}
+
 func splitOwnerAndRepo(repo string) (string, string, error) {
 	chunk := strings.Split(repo, "/")
 	if len(chunk) != 2 {
-		return "", "", errors.New("invalid repository name")
+		return "", "", fmt.Errorf("invalid repository name: '%s'", repo)
 	}
 	return chunk[0], chunk[1], nil
 }

github/github_beta.go

@@ -0,0 +1,95 @@
+package github
+
+// this contains BETA API clients, that are currently not (yet) in go-github
+// once these functions have been added there, they can be removed from here
+// code was reused from https://github.com/google/go-github
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+	"reflect"
+
+	"github.com/google/go-github/v31/github"
+	"github.com/google/go-querystring/query"
+)
+
+// CreateOrganizationRegistrationToken creates a token that can be used to add a self-hosted runner on an organization.
+//
+// GitHub API docs: https://developer.github.com/v3/actions/self-hosted-runners/#create-a-registration-token-for-an-organization
+func CreateOrganizationRegistrationToken(ctx context.Context, client *Client, owner string) (*github.RegistrationToken, *github.Response, error) {
+	u := fmt.Sprintf("orgs/%v/actions/runners/registration-token", owner)
+
+	req, err := client.NewRequest("POST", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	registrationToken := new(github.RegistrationToken)
+	resp, err := client.Do(ctx, req, registrationToken)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return registrationToken, resp, nil
+}
+
+// ListOrganizationRunners lists all the self-hosted runners for an organization.
+//
+// GitHub API docs: https://developer.github.com/v3/actions/self-hosted-runners/#list-self-hosted-runners-for-an-organization
+func ListOrganizationRunners(ctx context.Context, client *Client, owner string, opts *github.ListOptions) (*github.Runners, *github.Response, error) {
+	u := fmt.Sprintf("orgs/%v/actions/runners", owner)
+	u, err := addOptions(u, opts)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	req, err := client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	runners := &github.Runners{}
+	resp, err := client.Do(ctx, req, &runners)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return runners, resp, nil
+}
+
+// RemoveOrganizationRunner forces the removal of a self-hosted runner in a repository using the runner id.
+//
+// GitHub API docs: https://developer.github.com/v3/actions/self_hosted_runners/#remove-a-self-hosted-runner
+func RemoveOrganizationRunner(ctx context.Context, client *Client, owner string, runnerID int64) (*github.Response, error) {
+	u := fmt.Sprintf("orgs/%v/actions/runners/%v", owner, runnerID)
+
+	req, err := client.NewRequest("DELETE", u, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return client.Do(ctx, req, nil)
+}
+
+// addOptions adds the parameters in opt as URL query parameters to s. opt
+// must be a struct whose fields may contain "url" tags.
+func addOptions(s string, opts interface{}) (string, error) {
+	v := reflect.ValueOf(opts)
+	if v.Kind() == reflect.Ptr && v.IsNil() {
+		return s, nil
+	}
+
+	u, err := url.Parse(s)
+	if err != nil {
+		return s, err
+	}
+
+	qs, err := query.Values(opts)
+	if err != nil {
+		return s, err
+	}
+
+	u.RawQuery = qs.Encode()
+	return u.String(), nil
+}

github/github_test.go

@@ -36,18 +36,22 @@ func TestMain(m *testing.M) {
 
 func TestGetRegistrationToken(t *testing.T) {
 	tests := []struct {
+		org   string
 		repo  string
 		token string
 		err   bool
 	}{
-		{repo: "test/valid", token: fake.RegistrationToken, err: false},
-		{repo: "test/invalid", token: "", err: true},
-		{repo: "test/error", token: "", err: true},
+		{org: "test", repo: "valid", token: fake.RegistrationToken, err: false},
+		{org: "test", repo: "invalid", token: "", err: true},
+		{org: "test", repo: "error", token: "", err: true},
+		{org: "test", repo: "", token: fake.RegistrationToken, err: false},
+		{org: "invalid", repo: "", token: "", err: true},
+		{org: "error", repo: "", token: "", err: true},
 	}
 
 	client := newTestClient()
 	for i, tt := range tests {
-		rt, err := client.GetRegistrationToken(context.Background(), tt.repo, "test")
+		rt, err := client.GetRegistrationToken(context.Background(), tt.org, tt.repo, "test")
 		if !tt.err && err != nil {
 			t.Errorf("[%d] unexpected error: %v", i, err)
 		}
@@ -59,18 +63,22 @@ func TestGetRegistrationToken(t *testing.T) {
 
 func TestListRunners(t *testing.T) {
 	tests := []struct {
+		org    string
 		repo   string
 		length int
 		err    bool
 	}{
-		{repo: "test/valid", length: 2, err: false},
-		{repo: "test/invalid", length: 0, err: true},
-		{repo: "test/error", length: 0, err: true},
+		{org: "test", repo: "valid", length: 2, err: false},
+		{org: "test", repo: "invalid", length: 0, err: true},
+		{org: "test", repo: "error", length: 0, err: true},
+		{org: "test", repo: "", length: 2, err: false},
+		{org: "invalid", repo: "", length: 0, err: true},
+		{org: "error", repo: "", length: 0, err: true},
 	}
 
 	client := newTestClient()
 	for i, tt := range tests {
-		runners, err := client.ListRunners(context.Background(), tt.repo)
+		runners, err := client.ListRunners(context.Background(), tt.org, tt.repo)
 		if !tt.err && err != nil {
 			t.Errorf("[%d] unexpected error: %v", i, err)
 		}
@@ -82,17 +90,21 @@ func TestListRunners(t *testing.T) {
 
 func TestRemoveRunner(t *testing.T) {
 	tests := []struct {
+		org  string
 		repo string
 		err  bool
 	}{
-		{repo: "test/valid", err: false},
-		{repo: "test/invalid", err: true},
-		{repo: "test/error", err: true},
+		{org: "test", repo: "valid", err: false},
+		{org: "test", repo: "invalid", err: true},
+		{org: "test", repo: "error", err: true},
+		{org: "test", repo: "", err: false},
+		{org: "invalid", repo: "", err: true},
+		{org: "error", repo: "", err: true},
 	}
 
 	client := newTestClient()
 	for i, tt := range tests {
-		err := client.RemoveRunner(context.Background(), tt.repo, int64(1))
+		err := client.RemoveRunner(context.Background(), tt.org, tt.repo, int64(1))
 		if !tt.err && err != nil {
 			t.Errorf("[%d] unexpected error: %v", i, err)
 		}

go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/davecgh/go-spew v1.1.1
 	github.com/go-logr/logr v0.1.0
 	github.com/google/go-github/v31 v31.0.0
+	github.com/google/go-querystring v1.0.0
 	github.com/onsi/ginkgo v1.8.0
 	github.com/onsi/gomega v1.5.0
 	github.com/stretchr/testify v1.4.0 // indirect
@@ -14,5 +15,6 @@ require (
 	k8s.io/api v0.0.0-20190918155943-95b840bb6a1f
 	k8s.io/apimachinery v0.0.0-20190913080033-27d36303b655
 	k8s.io/client-go v0.0.0-20190918160344-1fbdaa4c8d90
+	k8s.io/klog v0.4.0
 	sigs.k8s.io/controller-runtime v0.4.0
 )

go.sum

@@ -116,6 +116,7 @@ github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/go-github v17.0.0+incompatible h1:N0LgJ1j65A7kfXrZnUDaYCs/Sf4rEjNlfyDHW9dolSY=
 github.com/google/go-github/v29 v29.0.2 h1:opYN6Wc7DOz7Ku3Oh4l7prmkOMwEcQxpFtxdU8N8Pts=
 github.com/google/go-github/v29 v29.0.2/go.mod h1:CHKiKKPHJ0REzfwc14QMklvtHwCveD0PxlMjLlzAM5E=
 github.com/google/go-github/v31 v31.0.0 h1:JJUxlP9lFK+ziXKimTCprajMApV1ecWD4NB6CCb0plo=

main.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"os"
 	"strconv"
+	"time"
 
 	actionsv1alpha1 "github.com/summerwind/actions-runner-controller/api/v1alpha1"
 	"github.com/summerwind/actions-runner-controller/controllers"
@@ -57,6 +58,7 @@ func main() {
 
 		metricsAddr          string
 		enableLeaderElection bool
+		syncPeriod           time.Duration
 
 		runnerImage string
 		dockerImage string
@@ -76,6 +78,7 @@ func main() {
 	flag.Int64Var(&ghAppID, "github-app-id", 0, "The application ID of GitHub App.")
 	flag.Int64Var(&ghAppInstallationID, "github-app-installation-id", 0, "The installation ID of GitHub App.")
 	flag.StringVar(&ghAppPrivateKey, "github-app-private-key", "", "The path of a private key file to authenticate as a GitHub App")
+	flag.DurationVar(&syncPeriod, "sync-period", 10*time.Minute, "Determines the minimum frequency at which K8s resources managed by this controller are reconciled. When you use autoscaling, set to a lower value like 10 minute, because this corresponds to the minimum time to react on demand change")
 	flag.Parse()
 
 	if ghToken == "" {
@@ -133,6 +136,7 @@ func main() {
 		MetricsBindAddress: metricsAddr,
 		LeaderElection:     enableLeaderElection,
 		Port:               9443,
+		SyncPeriod:         &syncPeriod,
 	})
 	if err != nil {
 		setupLog.Error(err, "unable to start manager")
@@ -174,6 +178,31 @@ func main() {
 		setupLog.Error(err, "unable to create controller", "controller", "RunnerDeployment")
 		os.Exit(1)
 	}
+
+	horizontalRunnerAutoscaler := &controllers.HorizontalRunnerAutoscalerReconciler{
+		Client:       mgr.GetClient(),
+		Log:          ctrl.Log.WithName("controllers").WithName("HorizontalRunnerAutoscaler"),
+		Scheme:       mgr.GetScheme(),
+		GitHubClient: ghClient,
+	}
+
+	if err = horizontalRunnerAutoscaler.SetupWithManager(mgr); err != nil {
+		setupLog.Error(err, "unable to create controller", "controller", "HorizontalRunnerAutoscaler")
+		os.Exit(1)
+	}
+
+	if err = (&actionsv1alpha1.Runner{}).SetupWebhookWithManager(mgr); err != nil {
+		setupLog.Error(err, "unable to create webhook", "webhook", "Runner")
+		os.Exit(1)
+	}
+	if err = (&actionsv1alpha1.RunnerDeployment{}).SetupWebhookWithManager(mgr); err != nil {
+		setupLog.Error(err, "unable to create webhook", "webhook", "RunnerDeployment")
+		os.Exit(1)
+	}
+	if err = (&actionsv1alpha1.RunnerReplicaSet{}).SetupWebhookWithManager(mgr); err != nil {
+		setupLog.Error(err, "unable to create webhook", "webhook", "RunnerReplicaSet")
+		os.Exit(1)
+	}
 	// +kubebuilder:scaffold:builder
 
 	setupLog.Info("starting manager")

runner/Dockerfile

@@ -3,9 +3,40 @@ FROM ubuntu:18.04
 ARG RUNNER_VERSION
 ARG DOCKER_VERSION
 
-RUN apt update \
-  && apt install sudo curl ca-certificates -y --no-install-recommends \
-  && curl -L -o docker.tgz https://download.docker.com/linux/static/stable/x86_64/docker-${DOCKER_VERSION}.tgz \
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt update -y \
+  && apt install -y software-properties-common \
+  && add-apt-repository -y ppa:git-core/ppa \
+  && apt update -y \
+  && apt install -y --no-install-recommends \
+     build-essential \
+     curl \
+     ca-certificates \
+     dnsutils \
+     ftp \
+     git \
+     iproute2 \
+     iputils-ping \
+     jq \
+     libunwind8 \
+     locales \
+     netcat \
+     openssh-client \
+     parallel \
+     rsync \
+     shellcheck \
+     sudo \
+     telnet \
+     time \
+     tzdata \
+     unzip \
+     upx \
+     wget \
+     zip \
+     zstd \
+  && rm -rf /var/lib/apt/lists/*
+
+RUN curl -L -o docker.tgz https://download.docker.com/linux/static/stable/x86_64/docker-${DOCKER_VERSION}.tgz \
   && tar zxvf docker.tgz \
   && install -o root -g root -m 755 docker/docker /usr/local/bin/docker \
   && rm -rf docker docker.tgz \
@@ -20,7 +51,8 @@ RUN mkdir -p /runner \
   && curl -L -o runner.tar.gz https://github.com/actions/runner/releases/download/v${RUNNER_VERSION}/actions-runner-linux-x64-${RUNNER_VERSION}.tar.gz \
   && tar xzf ./runner.tar.gz \
   && rm runner.tar.gz \
-  && ./bin/installdependencies.sh
+  && ./bin/installdependencies.sh \
+  && rm -rf /var/lib/apt/lists/*
 
 COPY entrypoint.sh /runner
 

runner/Makefile

@@ -1,7 +1,7 @@
 NAME ?= summerwind/actions-runner
 
-RUNNER_VERSION ?= 2.169.1
-DOCKER_VERSION ?= 19.03.8
+RUNNER_VERSION ?= 2.272.0
+DOCKER_VERSION ?= 19.03.12
 
 docker-build:
 	docker build --build-arg RUNNER_VERSION=${RUNNER_VERSION} --build-arg DOCKER_VERSION=${DOCKER_VERSION} -t ${NAME}:latest -t ${NAME}:v${RUNNER_VERSION} .

runner/entrypoint.sh

@@ -5,18 +5,28 @@ if [ -z "${RUNNER_NAME}" ]; then
   exit 1
 fi
 
-if [ -z "${RUNNER_REPO}" ]; then
-  echo "RUNNER_REPO must be set" 1>&2
+if [ -n "${RUNNER_ORG}" -a -n "${RUNNER_REPO}" ]; then
+  ATTACH="${RUNNER_ORG}/${RUNNER_REPO}"
+elif [ -n "${RUNNER_ORG}" ]; then
+  ATTACH="${RUNNER_ORG}"
+elif [ -n "${RUNNER_REPO}" ]; then
+  ATTACH="${RUNNER_REPO}"
+else
+  echo "At least one of RUNNER_ORG or RUNNER_REPO must be set" 1>&2
   exit 1
 fi
 
+if [ -n "${RUNNER_LABELS}" ]; then
+  LABEL_ARG="--labels ${RUNNER_LABELS}"
+fi
+
 if [ -z "${RUNNER_TOKEN}" ]; then
   echo "RUNNER_TOKEN must be set" 1>&2
   exit 1
 fi
 
 cd /runner
-./config.sh --unattended --replace --name "${RUNNER_NAME}" --url "https://github.com/${RUNNER_REPO}" --token "${RUNNER_TOKEN}"
+./config.sh --unattended --replace --name "${RUNNER_NAME}" --url "https://github.com/${ATTACH}" --token "${RUNNER_TOKEN}" ${LABEL_ARG}
 
 unset RUNNER_NAME RUNNER_REPO RUNNER_TOKEN
 exec ./run.sh --once