Install latest patch versions of golang for linux (#501)

* install golang for linux

images/linux/scripts/installers/1604/go.sh

@@ -1,36 +0,0 @@
-#!/bin/bash
-################################################################################
-##  File:  go.sh
-##  Desc:  Installs go, configures GOROOT, and adds go to the path
-################################################################################
-
-# Source the helpers for use with the script
-source $HELPER_SCRIPTS/document.sh
-
-# This function installs Go using the specified arguments:
-#   $1=MajorVersion (1.11)
-#   $2=MajorAndMinorVersion (1.11.1)
-#   $3=IsDefaultVersion (true or false)
-function InstallGo () {
-    curl -sL https://dl.google.com/go/go$2.linux-amd64.tar.gz -o go$2.linux-amd64.tar.gz
-    mkdir -p /usr/local/go$1
-    tar -C /usr/local/go$1 -xzf go$2.linux-amd64.tar.gz --strip-components=1 go
-    rm go$2.linux-amd64.tar.gz
-    echo "GOROOT_${1//./_}_X64=/usr/local/go$1" | tee -a /etc/environment
-    DocumentInstalledItem "Go $1 ($(/usr/local/go$1/bin/go version))"
-
-    # If this version of Go is to be the default version,
-    # symlink it into the path and point GOROOT to it.
-    if [ $3 = true ]
-    then
-        ln -s /usr/local/go$1/bin/* /usr/bin/
-        echo "GOROOT=/usr/local/go$1" | tee -a /etc/environment
-    fi
-}
-
-# Install Go versions
-InstallGo 1.9 1.9.7 false
-InstallGo 1.10 1.10.8 false
-InstallGo 1.11 1.11.12 false
-InstallGo 1.12 1.12.7 true
-InstallGo 1.13 1.13 false

images/linux/scripts/installers/1804/go.sh

@@ -1,34 +0,0 @@
-#!/bin/bash
-################################################################################
-##  File:  go.sh
-##  Desc:  Installs go, configures GOROOT, and adds go to the path
-################################################################################
-
-# Source the helpers for use with the script
-source $HELPER_SCRIPTS/document.sh
-
-# This function installs Go using the specified arguments:
-#   $1=MajorVersion (1.11)
-#   $2=MajorAndMinorVersion (1.11.1)
-#   $3=IsDefaultVersion (true or false)
-function InstallGo () {
-    curl -sL https://dl.google.com/go/go$2.linux-amd64.tar.gz -o go$2.linux-amd64.tar.gz
-    mkdir -p /usr/local/go$1
-    tar -C /usr/local/go$1 -xzf go$2.linux-amd64.tar.gz --strip-components=1 go
-    rm go$2.linux-amd64.tar.gz
-    echo "GOROOT_${1//./_}_X64=/usr/local/go$1" | tee -a /etc/environment
-    DocumentInstalledItem "Go $1 ($(/usr/local/go$1/bin/go version))"
-
-    # If this version of Go is to be the default version,
-    # symlink it into the path and point GOROOT to it.
-    if [ $3 = true ]
-    then
-        ln -s /usr/local/go$1/bin/* /usr/bin/
-        echo "GOROOT=/usr/local/go$1" | tee -a /etc/environment
-    fi
-}
-
-# Install Go versions
-InstallGo 1.11 1.11.12 false
-InstallGo 1.12 1.12.7 true
-InstallGo 1.13 1.13 false

images/linux/scripts/installers/go.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+################################################################################
+##  File:  go.sh
+##  Desc:  Installs go, configures GOROOT, and adds go to the path
+################################################################################
+
+# Source the helpers for use with the script
+source $HELPER_SCRIPTS/document.sh
+golangTags="/tmp/golang_tags.json"
+
+# This function installs Go using the specified arguments:
+#   $1=MajorVersion (1.11)
+#   $2=IsDefaultVersion (true or false)
+function InstallGo () {
+    version=$( getFullGoVersion $1 )
+    downloadVersion=$version.linux-amd64.tar.gz
+    goFolder=/usr/local/go$1
+
+    echo "Install Go $version"
+    curl -sL https://dl.google.com/go/${downloadVersion} -o ${downloadVersion}
+    mkdir -p $goFolder
+    tar -C $goFolder -xzf $downloadVersion --strip-components=1 go
+    rm $downloadVersion
+    echo "GOROOT_${1//./_}_X64=$goFolder" | tee -a /etc/environment
+    DocumentInstalledItem "Go $1 ($($goFolder/bin/go version))"
+
+    # If this version of Go is to be the default version,
+    # symlink it into the path and point GOROOT to it.
+    if [ $2 = true ]
+    then
+        ln -s $goFolder/bin/* /usr/bin/
+        echo "GOROOT=$goFolder" | tee -a /etc/environment
+    fi
+}
+
+function getFullGoVersion () {
+    local pattern="refs/tags/go$1([.0-9]{0,3})$"
+    local query='[.[] | select( .ref | test($pattern))] | .[-1] | .ref'
+    refValue=$(jq --arg pattern "$pattern" "$query" $golangTags)
+    version=$(echo "$refValue" | cut -d '/' -f 3)
+    version=$(echo "${version//\"}") # go1.12.17
+    echo $version
+}
+
+# load golang_tags.json file
+curl -s 'https://api.github.com/repos/golang/go/git/refs/tags' >> $golangTags
+# Install Go versions
+for go in ${GO_VERSIONS}; do
+    echo "Installing Go ${go}"
+    if [[ $go == $GO_DEFAULT ]]; then
+        InstallGo $go true
+    else
+        InstallGo $go false
+    fi
+done

images/linux/ubuntu1604.json

@@ -23,7 +23,9 @@
         "capture_name_prefix": "packer",
         "image_version": "dev",
         "image_os": "ubuntu16",
-        "github_feed_token": null
+        "github_feed_token": null,
+        "go_default": "1.14",
+        "go_versions": "1.11 1.12 1.13 1.14"
     },
     "sensitive-variables": ["client_secret", "github_feed_token"],
     "builders": [
@@ -148,7 +150,6 @@
                 "{{template_dir}}/scripts/installers/gcc.sh",
                 "{{template_dir}}/scripts/installers/gfortran.sh",
                 "{{template_dir}}/scripts/installers/git.sh",
-                "{{template_dir}}/scripts/installers/1604/go.sh",
                 "{{template_dir}}/scripts/installers/google-chrome.sh",
                 "{{template_dir}}/scripts/installers/google-cloud-sdk.sh",
                 "{{template_dir}}/scripts/installers/haskell.sh",
@@ -192,6 +193,19 @@
             ],
             "execute_command": "sudo sh -c '{{ .Vars }} {{ .Path }}'"
         },
+        {
+            "type": "shell",
+            "scripts": [
+                "{{template_dir}}/scripts/installers/go.sh"
+            ],
+            "environment_vars": [
+                "METADATA_FILE={{user `metadata_file`}}",
+                "HELPER_SCRIPTS={{user `helper_script_folder`}}",
+                "GO_VERSIONS={{user `go_versions`}}",
+                "GO_DEFAULT={{user `go_default`}}"
+            ],
+            "execute_command": "chmod +x {{ .Path }}; sudo {{ .Vars }} {{ .Path }}"
+        },
         {
             "type": "file",
             "source": "{{template_dir}}/toolcache-1604.json",

images/linux/ubuntu1804.json

@@ -23,7 +23,9 @@
         "capture_name_prefix": "packer",
         "image_version": "dev",
         "image_os": "ubuntu18",
-        "github_feed_token": null
+        "github_feed_token": null,
+        "go_default": "1.14",
+        "go_versions": "1.11 1.12 1.13 1.14"
     },
     "sensitive-variables": ["client_secret", "github_feed_token"],
     "builders": [
@@ -151,7 +153,6 @@
                 "{{template_dir}}/scripts/installers/gcc.sh",
                 "{{template_dir}}/scripts/installers/gfortran.sh",
                 "{{template_dir}}/scripts/installers/git.sh",
-                "{{template_dir}}/scripts/installers/1804/go.sh",
                 "{{template_dir}}/scripts/installers/google-chrome.sh",
                 "{{template_dir}}/scripts/installers/google-cloud-sdk.sh",
                 "{{template_dir}}/scripts/installers/haskell.sh",
@@ -194,6 +195,19 @@
             ],
             "execute_command": "sudo sh -c '{{ .Vars }} {{ .Path }}'"
         },
+        {
+            "type": "shell",
+            "scripts": [
+                "{{template_dir}}/scripts/installers/go.sh"
+            ],
+            "environment_vars": [
+                "METADATA_FILE={{user `metadata_file`}}",
+                "HELPER_SCRIPTS={{user `helper_script_folder`}}",
+                "GO_VERSIONS={{user `go_versions`}}",
+                "GO_DEFAULT={{user `go_default`}}"
+            ],
+            "execute_command": "chmod +x {{ .Path }}; sudo {{ .Vars }} {{ .Path }}"
+        },
         {
             "type": "file",
             "source": "{{template_dir}}/toolcache-1804.json",