backport.yml

name: Backport
on:
  pull_request_target:
    types:
      - closed
      - labeled

jobs:
  backport:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
    name: Backport
    # 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.repository == 'opensearch-project/documentation-website'
      && (
        github.event.action == 'closed'
        || (
          github.event.action == 'labeled'
          && contains(github.event.label.name, 'backport')
        )
      )
    steps:
      - name: GitHub App token
        id: github_app_token
        uses: tibdex/github-app-token@v1.5.0
        with:
          app_id: ${{ secrets.APP_ID }}
          private_key: ${{ secrets.APP_PRIVATE_KEY }}
          # opensearch-trigger-bot installation ID
          installation_id: 22958780

      - name: Backport
        uses: VachaShah/backport@v2.1.0
        with:
          github_token: ${{ steps.github_app_token.outputs.token }}
          head_template: backport/backport-<%= number %>-to-<%= base %>

      - name: Label new backport PR with backport-automerge label
        run: |
          PR_LABELS=`echo "${{ toJson(github.event.pull_request.labels.*.name) }}" | sed -e 's/\[//g;s/\]//g;s/^\s*//g;s/\s*$//g' | tr -d '\n'`
          echo $PR_LABELS
          OLDIFS=$IFS
          export IFS=','
          for label in $PR_LABELS
          do
            if [[ "$label" == "backport"* ]]; then
              echo "Found label \"$label\""
              PR_REPO="opensearch-project/documentation-website"
              PR_BRANCH=backport/backport-${{ github.event.pull_request.number }}-to-`echo $label | cut -d ' ' -f2`
              PR_NUMBER=`gh pr list -R $PR_REPO --json "number,headRefName" --state open | jq -r ".[] | select(.headRefName == \"$PR_BRANCH\") | .number"`
              echo "Update Backport PR '#$PR_NUMBER' on branch '$PR_BRANCH' with 'backport-automerge' label"
              gh issue edit -R $PR_REPO $PR_NUMBER --add-label backport-automerge
              echo "Auto approve $PR_REPO PR #$PR_NUMBER with opensearch-trigger-bot"
              gh pr review -R $PR_REPO $PR_NUMBER --approve
            fi
          done
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}