Add terraform destroy action (hashicorp#143)

* Add `destroy` subcommand option

* Create `terraform_destroy` shell script

* Add clean-up for failed `apply`

* Fix typo in log message

Co-Authored-By: Igor Veselinovic <[email protected]>

* Remove `destroy` when `apply` fails

Co-authored-by: Igor Veselinovic <[email protected]>

Author: Thao-Tran

src/main.sh

@@ -114,6 +114,7 @@ function main {
   source ${scriptDir}/terraform_output.sh
   source ${scriptDir}/terraform_import.sh
   source ${scriptDir}/terraform_taint.sh
+  source ${scriptDir}/terraform_destroy.sh
 
   parseInputs
   configureCLICredentials
@@ -152,6 +153,10 @@ function main {
       installTerraform
       terraformTaint ${*}
       ;;
+    destroy)
+      installTerraform
+      terraformDestroy ${*}
+      ;;
     *)
       echo "Error: Must provide a valid value for terraform_subcommand"
       exit 1

src/terraform_destroy.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+function terraformDestroy {
+  # Gather the output of `terraform destroy`.
+  echo "destroy: info: destroying Terraform-managed infrastructure in ${tfWorkingDir}"
+  destroyOutput=$(terraform destroy -auto-approve -input=false ${*} 2>&1)
+  destroyExitCode=${?}
+  destroyCommentStatus="Failed"
+
+  # Exit code of 0 indicates success. Print the output and exit.
+  if [ ${destroyExitCode} -eq 0 ]; then
+    echo "destroy: info: successfully destroyed Terraform-managed infrastructure in ${tfWorkingDir}"
+    echo "${destroyOutput}"
+    echo
+    destroyCommentStatus="Success"
+  fi
+
+  # Exit code of !0 indicates failure.
+  if [ ${destroyExitCode} -ne 0 ]; then
+    echo "destroy: error: failed to destroy Terraform configuration in ${tfWorkingDir}"
+    echo "${destroyOutput}"
+    echo
+  fi
+
+  # Comment on the pull request if necessary.
+  if [ "$GITHUB_EVENT_NAME" == "pull_request" ] && [ "${tfComment}" == "1" ]; then
+    destroyCommentWrapper="#### \`terraform destroy\` ${destroyCommentStatus}
+<details><summary>Show Output</summary>
+
+\`\`\`
+${destroyOutput}
+\`\`\`
+
+</details>
+
+*Workflow: \`${GITHUB_WORKFLOW}\`, Action: \`${GITHUB_ACTION}\`, Working Directory: \`${tfWorkingDir}\`*"
+
+    destroyCommentWrapper=$(stripColors "${destroyCommentWrapper}")
+    echo "destroy: info: creating JSON"
+    destroyPayload=$(echo "${destroyCommentWrapper}" | jq -R --slurp '{body: .}')
+    destroyCommentsURL=$(cat ${GITHUB_EVENT_PATH} | jq -r .pull_request.comments_url)
+    echo "destroy: info: commenting on the pull request"
+    echo "${destroyPayload}" | curl -s -S -H "Authorization: token ${GITHUB_TOKEN}" --header "Content-Type: application/json" --data @- "${destroyCommentsURL}" > /dev/null
+  fi
+
+  exit ${destroyExitCode}
+}