cherry-picks.yaml

name: Cherry Pick
on:
  pull_request_target:
    types:
      - closed
      - labeled

jobs:
  cherry-pick:
    name: Cherry Pick
    runs-on: ubuntu-latest
    # Only react to merged PRs for security reasons.
    # See https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#pull_request_target.
    if: >
      github.event.pull_request.merged
      && (
        github.event.action == 'closed'
        || (
          github.event.action == 'labeled'
          && contains(github.event.label.name, 'target/')
        )
      )
    steps:
      - uses: tibdex/github-app-token@v1
        id: generate-token
        with:
          app_id: ${{ secrets.QUARKUS_HILLA_BOT_ID }}
          private_key: ${{ secrets.QUARKUS_HILLA_BOT_PRIVATE_KEY }}
      - uses: tibdex/backport@v2
        id: backport
        with:
          github_token: ${{ steps.generate-token.outputs.token }}
          head_template: "cherry/cherrypick-<%= number %>-to-<%= base %>"
          title_template: "<%= title %> (#<%= number %>) (CP: <%= base %>)"
          body_template: "<%= body %>"
          label_pattern: "^target/(?<base>([^ ]+))$"
          labels_template: "[ \"cherry-pick\" ]"
      - uses: actions/github-script@v6
        with:
          github-token: ${{ steps.generate-token.outputs.token }}
          script: |
            const picked = JSON.parse('${{ steps.backport.outputs.created_pull_requests }}');
            const { owner, repo } = context.repo;
            const prNumber = context.payload.pull_request.number;

            const existingLabels = await github.rest.issues.listLabelsOnIssue({
              owner,
              repo,
              issue_number: prNumber,
            }).then(resp => resp.data.map(label => label.name));

            const labelsToAdd = Object.keys(picked)
              .map( targetBranch => "picked/" + targetBranch)
              .filter( label => !existingLabels.includes(label) );
            
            if (labelsToAdd.length > 0) {            
              await github.rest.issues.addLabels({
                owner,
                repo,
                issue_number: prNumber,
                labels: labelsToAdd,
              });
            }