cherry-pick.yml

name: Cherry pick
on:
  pull_request:
    types:
      - closed
    branches:
      - '[0-9]+.x.x'

env:
  TARGET_BRANCH: main
  FROM_BRANCH: ${{ github.event.pull_request.base.ref }}

jobs:
  cherry-pick:
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ env.TARGET_BRANCH }}
          fetch-depth: 0
          token: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}

      - uses: actions/setup-node@v4
        id: setup-node
        with:
          node-version-file: '.nvmrc'

      - name: Cache node modules
        id: cache
        uses: actions/cache@v4
        with:
          path: node_modules
          key: ${{ runner.os }}-node-${{ steps.setup-node.outputs.node-version }}-modules-${{ hashFiles('package-lock.json') }}

      - name: npm install
        if: steps.cache.outputs.cache-hit != 'true'
        run: npm ci

      - name: Cherry pick
        id: cherry-pick
        run: |
          # Set the git user to the author of the merge commit.
          git config user.name "$(git log -1 --pretty=format:'%an' ${{ github.event.pull_request.merge_commit_sha }})"
          git config user.email "$(git log -1 --pretty=format:'%ae' ${{ github.event.pull_request.merge_commit_sha }})"

          # Echo commands to the log.
          set -x

          # Do not exit on error.
          set +e

          # Cherry-pick the merge commit into the target branch, which is checked out.
          npx skyux-dev cherry-pick \
            --baseBranch=${{ env.TARGET_BRANCH }} \
            --hash=${{ github.event.pull_request.merge_commit_sha }} \
            --skip-confirmation

          if [ $? -ne 0 ]; then
            echo "CHERRY_PICK_RESULT=failed" >> $GITHUB_ENV
            exit 0
          fi

          # Get the name of the cherry-pick branch.
          CHERRY_PICK_BRANCH=$(git branch --show-current)
          # Add the cherry-pick branch to the environment.
          echo "CHERRY_PICK_BRANCH=${CHERRY_PICK_BRANCH}" >> $GITHUB_ENV

          # Push the cherry-pick to a new cherry-pick branch.
          git push -u origin ${CHERRY_PICK_BRANCH}

          if [ $? -ne 0 ]; then
            echo "CHERRY_PICK_RESULT=failed" >> $GITHUB_ENV
            exit 0
          fi

          echo "commit_message=$(git log -1 --pretty=%s)" >> $GITHUB_OUTPUT
        env:
          GH_TOKEN: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}

      - uses: actions/github-script@v7
        if: ${{ env.CHERRY_PICK_RESULT != 'failed' }}
        with:
          github-token: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}
          script: |
            const pr = context.payload.pull_request;
            const title = ${{ toJson(steps.cherry-pick.outputs.commit_message) }};
            let body = `:cherries: Cherry picked from #${pr.number} [${pr.title}](${pr.html_url})`
            const prAzureBoardLink = pr.body?.match(/(?<=\[)AB#\d+(?=])/g);
            if (prAzureBoardLink) {
              body += `\n\n${prAzureBoardLink.join(' \n')} `;
            }
            github.rest.pulls.create({
              owner: context.repo.owner,
              repo: context.repo.repo,
              head: process.env.CHERRY_PICK_BRANCH,
              base: process.env.TARGET_BRANCH,
              title,
              body
            }).then(result => {
              console.log(`Created PR #${result.data.number}: ${result.data.html_url}`);
              core.exportVariable('PR_URL', result.data.html_url);
              core.exportVariable('CHERRY_PICK_RESULT', 'success');
              const riskLabels = pr.labels.map(label => label.name).filter(label => label.startsWith('risk level'));
              if (riskLabels.length === 0) {
                if (pr.labels.find(label => label.name.startsWith('autorelease'))) {
                  // Changelog PR, so add minimal risk level labels.
                  riskLabels.push('risk level (author): 1', 'risk level (reviewer): 1');
                } else {
                  // No risk level label found, so don't add any.
                  return;
                }
              }
              return github.rest.issues.update({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: result.data.number,
                labels: riskLabels
              });
            }).catch(error => {
              console.log(error);
              core.warning(`Failed to create PR: ${error.message}`);
              core.exportVariable('CHERRY_PICK_RESULT', 'failed');
            });

      - name: Comment on the original PR when cherry-pick is successful
        if: ${{ env.CHERRY_PICK_RESULT == 'success' }}
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}
          script: |
            github.rest.issues.createComment({
              issue_number: context.payload.pull_request.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: 'Cherry-pick successful! :cherries: :tada: See ${{ env.PR_URL }}'
            })

      - name: Comment on the original PR when cherry-pick fails
        if: ${{ env.CHERRY_PICK_RESULT != 'success' }}
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}
          script: |
            github.rest.issues.createComment({
              issue_number: context.payload.pull_request.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: 'Cherry-pick [failed](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }})! :x: Please resolve conflicts and create a new PR.'
            })

      - name: Notify Slack when cherry-pick fails
        if: ${{ env.CHERRY_PICK_RESULT != 'success' }}
        uses: rtCamp/action-slack-notify@v2
        env:
          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
          SLACK_TITLE: ':cherries: :x: Cherry-pick failed for “${{ github.event.pull_request.title }} (#${{ github.event.pull_request.number}})”'
          SLACK_MESSAGE: '${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}'
          SLACK_ICON_EMOJI: ':github:'
          SLACK_USERNAME: GitHub
          #cor-skyux-notifications
          SLACK_CHANNEL: C01GY7ZP4HM
          SLACK_COLOR: 'fail'
          SLACK_FOOTER: 'Blackbaud Sky Build User'
          MSG_MINIMAL: 'true'