pullrequest-close.yml

name: PR close

on:
  pull_request:
    types:
      - closed
defaults:
  run:
    shell: bash

jobs:
  check-unicorn:
    name: Is this a unicorn PR
    if: github.event.pull_request.merged == true
    runs-on: arc-runners
    timeout-minutes: 10
    outputs:
      IS_UNICORN: ${{ steps.unicorn_affected.outputs.IS_UNICORN }}
      LATEST_RELEASE: ${{ steps.get_latest_release.outputs.LATEST_RELEASE }}
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - uses: actions/setup-node@v4
        with:
          node-version-file: 'package.json'

      - name: Setup yarn
        run: corepack enable

      - name: Get cache
        id: get-cache
        uses: ./.github/actions/get-cache
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          enable-cache: 'node_modules'

      - name: Derive appropriate SHAs
        uses: nrwl/nx-set-shas@v4

      - run: |
          echo "BASE: ${{ env.NX_BASE }}"
          echo "HEAD: ${{ env.NX_HEAD }}"
      - name: Check unicorn affected
        id: unicorn_affected
        run: |
          echo "Comparing nx affected for ${{ env.NX_HEAD }} using ${{ env.NX_BASE }} as base branch"
          echo IS_UNICORN=$(node scripts/ci/unicorn-utils.mjs "{\"head\": \"${{ env.NX_HEAD }}\", \"base\": \"${{ env.NX_BASE }}\" }") >> "$GITHUB_OUTPUT"

      - name: Results
        run: |
          echo "Unicorn = ${{ steps.unicorn_affected.outputs.IS_UNICORN }}"

      - name: Find Latest Release Branch
        if: ${{ steps.unicorn_affected.outputs.IS_UNICORN == 'true' }}
        id: get_latest_release
        run: |
          LATEST_RELEASE="$(node scripts/ci/get-last-release.mjs $(git branch -r))"
          echo LATEST_RELEASE=$LATEST_RELEASE >> "$GITHUB_OUTPUT"

      - run: "echo 'latest release: ${{ steps.get_latest_release.outputs.LATEST_RELEASE }}'"

      - name: Create a PR
        if: ${{ steps.unicorn_affected.outputs.IS_UNICORN == 'true' }}
        id: create_pr
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_BRANCH: ${{ github.head_ref}}/cherry-pick
          TARGET_BRANCH: release/${{ steps.get_latest_release.outputs.LATEST_RELEASE }}
        run: |
          git config --global user.email "${{ github.actor }}@users.noreply.github.com"
          git config --global user.name "${{ github.actor }} (automated)"
          echo ${{ github.event.pull_request.merge_commit_sha }}
          echo ${{ github.head_ref}}
          git checkout $TARGET_BRANCH
          git checkout -b $PR_BRANCH
          git cherry-pick -x ${{ github.event.pull_request.merge_commit_sha }}
          git commit --allow-empty -am "Automated cherry-pick of ${{ github.event.pull_request.merge_commit_sha }}"
          git push --set-upstream origin $PR_BRANCH
          echo "new branch created"
          PR=$(gh pr create -B $TARGET_BRANCH -H $PR_BRANCH --title "Automated cherry-pick of ${{ github.event.pull_request.merge_commit_sha }}" --body "Automated cherry-pick of ${{ github.event.pull_request.merge_commit_sha }}")
          echo "$PR created"
          echo PR=$PR >> "$GITHUB_OUTPUT"

      - name: Send slack message
        if: ${{ steps.unicorn_affected.outputs.IS_UNICORN == 'true' }}
        uses: slackapi/slack-github-action@v2.0.0
        with:
          method: chat.postMessage
          token: ${{ secrets.SLACK_BOT_TOKEN }}
          payload: |
            channel: ${{ secrets.SLACK_CHANNEL_ID }}
            text: "A new PR has been created: ${{ steps.create_pr.outputs.PR }}"

  cleanup:
    name: Clean up feature deployment
    runs-on: arc-runners
    steps:
      - name: Get git branch
        run: |
          set -euo pipefail
          GIT_BRANCH="${GITHUB_HEAD_REF:-${GITHUB_REF/refs\/heads\//}}"
          echo "GIT_BRANCH=$GIT_BRANCH" >> "$GITHUB_ENV"
      - name: Generate deployment branch name
        id: git-branch-deploy
        run: |
          set -euo pipefail
          GIT_BRANCH_DEPLOY="$GIT_BRANCH"
          if [[ ! ("$GIT_BRANCH_DEPLOY" =~ "feature/") ]]; then
            # If event is pull request but branch is not prefixed with feature/
            GIT_BRANCH_DEPLOY=feature/$GIT_BRANCH_DEPLOY
          fi
          # Avoid too long resource names
          GIT_BRANCH_DEPLOY="${GIT_BRANCH_DEPLOY:0:50}"
          echo "GIT_BRANCH_DEPLOY=$GIT_BRANCH_DEPLOY" >> "$GITHUB_ENV"
      - name: Clean up feature
        env:
          SPINNAKER_WEBHOOK_TOKEN: ${{ secrets.SPINNAKER_WEBHOOK_TOKEN }}
          SPINNAKER_URL: https://spinnaker-gate.shared.devland.is
        run: |
          set -euo pipefail
          curl "$SPINNAKER_URL/webhooks/webhook/feature-cleanup" -H "content-type: application/json" --data-binary @- <<BODY
          {
            "token": "$SPINNAKER_WEBHOOK_TOKEN",
            "parameters": {
              "feature_name": "$(echo "$GIT_BRANCH_DEPLOY" | cut -d"/" -f2- | tr -cd '[:alnum:]-' | tr '[:upper:]' '[:lower:]' | cut -c1-50)"
            }
          }
          BODY