Add support to terragrunt

Author: rriveramdz

action.yml

@@ -11,6 +11,11 @@ inputs:
   tf_actions_version:
     description: 'Terraform version to install.'
     required: true
+    default: 'latest'
+  tg_actions_version:
+    description: 'Terragrunt version to install.'
+    required: true
+    default: 'latest'
   tf_actions_cli_credentials_hostname:
     description: 'Hostname for the CLI credentials file.'
     default: 'app.terraform.io'

src/main.sh

@@ -24,6 +24,13 @@ function parseInputs {
     exit 1
   fi
 
+  if [ "${INPUT_TG_ACTIONS_VERSION}" != "" ]; then
+    tgVersion=${INPUT_TG_ACTIONS_VERSION}
+  else
+    echo "Input terragrunt_version cannot be empty"
+    exit 1
+  fi
+
   if [ "${INPUT_TF_ACTIONS_SUBCOMMAND}" != "" ]; then
     tfSubcommand=${INPUT_TF_ACTIONS_SUBCOMMAND}
   else
@@ -103,62 +110,94 @@ function installTerraform {
   echo "Successfully unzipped Terraform v${tfVersion}"
 }
 
+function installTerragrunt {
+  if [[ "${tgVersion}" == "latest" ]]; then
+    echo "Checking the latest version of Terragrunt"
+    latestURL=$(curl -Ls -o /dev/null -w %{url_effective} https://github.com/gruntwork-io/terragrunt/releases/latest)
+    tgVersion=${latestURL##*/}
+
+    if [[ -z "${tgVersion}" ]]; then
+      echo "Failed to fetch the latest version"
+      exit 1
+    fi
+  fi
+
+  url="https://github.com/gruntwork-io/terragrunt/releases/download/${tgVersion}/terragrunt_linux_386"
+
+  echo "Downloading Terragrunt ${tgVersion}"
+  curl -s -S -L -o /tmp/terragrunt_${tgVersion} ${url}
+  if [ "${?}" -ne 0 ]; then
+    echo "Failed to download Terragrunt v${tgVersion}"
+    exit 1
+  fi
+  echo "Successfully downloaded Terragrunt v${tgVersion}"
+
+  echo "Unzipping Terragrunt v${tgVersion}"
+  unzip -d /usr/local/bin /tmp/terragrunt_${tgVersion} &> /dev/null
+  if [ "${?}" -ne 0 ]; then
+    echo "Failed to unzip Terragrunt ${tgVersion}"
+    exit 1
+  fi
+  echo "Successfully unzipped Terragrunt ${tgVersion}"
+}
+
 function main {
   # Source the other files to gain access to their functions
   scriptDir=$(dirname ${0})
-  source ${scriptDir}/terraform_fmt.sh
-  source ${scriptDir}/terraform_init.sh
-  source ${scriptDir}/terraform_validate.sh
-  source ${scriptDir}/terraform_plan.sh
-  source ${scriptDir}/terraform_apply.sh
-  source ${scriptDir}/terraform_output.sh
-  source ${scriptDir}/terraform_import.sh
-  source ${scriptDir}/terraform_taint.sh
-  source ${scriptDir}/terraform_destroy.sh
-
+  source ${scriptDir}/terragrunt_fmt.sh
+  source ${scriptDir}/terragrunt_init.sh
+  source ${scriptDir}/terragrunt_validate.sh
+  source ${scriptDir}/terragrunt_plan.sh
+  source ${scriptDir}/terragrunt_apply.sh
+  source ${scriptDir}/terragrunt_output.sh
+  source ${scriptDir}/terragrunt_import.sh
+  source ${scriptDir}/terragrunt_taint.sh
+  source ${scriptDir}/terragrunt_destroy.sh
+
+  installTerraform
   parseInputs
   configureCLICredentials
   cd ${GITHUB_WORKSPACE}/${tfWorkingDir}
 
   case "${tfSubcommand}" in
     fmt)
-      installTerraform
-      terraformFmt ${*}
+      installTerragrunt
+      terragruntFmt ${*}
       ;;
     init)
-      installTerraform
-      terraformInit ${*}
+      installTerragrunt
+      terragruntInit ${*}
       ;;
     validate)
-      installTerraform
-      terraformValidate ${*}
+      installTerragrunt
+      terragruntValidate ${*}
       ;;
     plan)
-      installTerraform
-      terraformPlan ${*}
+      installTerragrunt
+      terragruntPlan ${*}
       ;;
     apply)
-      installTerraform
-      terraformApply ${*}
+      installTerragrunt
+      terragruntApply ${*}
       ;;
     output)
-      installTerraform
-      terraformOutput ${*}
+      installTerragrunt
+      terragruntOutput ${*}
       ;;
     import)
-      installTerraform
-      terraformImport ${*}
+      installTerragrunt
+      terragruntImport ${*}
       ;;
     taint)
-      installTerraform
-      terraformTaint ${*}
+      installTerragrunt
+      terragruntTaint ${*}
       ;;
     destroy)
-      installTerraform
-      terraformDestroy ${*}
+      installTerragrunt
+      terragruntDestroy ${*}
       ;;
     *)
-      echo "Error: Must provide a valid value for terraform_subcommand"
+      echo "Error: Must provide a valid value for terragrunt_subcommand"
       exit 1
       ;;
   esac

src/terraform_apply.sh src/terragrunt_apply.shsrc/terraform_apply.sh renamed to src/terragrunt_apply.sh

@@ -1,16 +1,16 @@
 #!/bin/bash
 
-function terraformPlan {
-  # Gather the output of `terraform plan`.
-  echo "plan: info: planning Terraform configuration in ${tfWorkingDir}"
-  planOutput=$(terraform plan -detailed-exitcode -input=false ${*} 2>&1)
+function terragruntPlan {
+  # Gather the output of `terragrunt plan`.
+  echo "plan: info: planning Terragrunt configuration in ${tfWorkingDir}"
+  planOutput=$(terragrunt plan -detailed-exitcode -input=false ${*} 2>&1)
   planExitCode=${?}
   planHasChanges=false
   planCommentStatus="Failed"
 
   # Exit code of 0 indicates success with no changes. Print the output and exit.
   if [ ${planExitCode} -eq 0 ]; then
-    echo "plan: info: successfully planned Terraform configuration in ${tfWorkingDir}"
+    echo "plan: info: successfully planned Terragrunt configuration in ${tfWorkingDir}"
     echo "${planOutput}"
     echo
     echo ::set-output name=tf_actions_plan_has_changes::${planHasChanges}
@@ -23,7 +23,7 @@ function terraformPlan {
     planExitCode=0
     planHasChanges=true
     planCommentStatus="Success"
-    echo "plan: info: successfully planned Terraform configuration in ${tfWorkingDir}"
+    echo "plan: info: successfully planned Terragrunt configuration in ${tfWorkingDir}"
     echo "${planOutput}"
     echo
     if echo "${planOutput}" | egrep '^-{72}$' &> /dev/null; then
@@ -37,14 +37,14 @@ function terraformPlan {
 
   # Exit code of !0 indicates failure.
   if [ ${planExitCode} -ne 0 ]; then
-    echo "plan: error: failed to plan Terraform configuration in ${tfWorkingDir}"
+    echo "plan: error: failed to plan Terragrunt configuration in ${tfWorkingDir}"
     echo "${planOutput}"
     echo
   fi
 
   # Comment on the pull request if necessary.
   if [ "$GITHUB_EVENT_NAME" == "pull_request" ] && [ "${tfComment}" == "1" ] && ([ "${planHasChanges}" == "true" ] || [ "${planCommentStatus}" == "Failed" ]); then
-    planCommentWrapper="#### \`terraform plan\` ${planCommentStatus}
+    planCommentWrapper="#### \`terragrunt plan\` ${planCommentStatus}
 <details><summary>Show Output</summary>
 
 \`\`\`