backport.yaml

name: Automatic backport action

on:
  pull_request_target:
    types: ["labeled", "closed"]

jobs:
  backport:
    name: Backport PR
    if: github.event.pull_request.merged == true && !(contains(github.event.pull_request.labels.*.name, 'backport'))
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Install GH CLI
        uses: dev-hanz-ops/install-gh-cli-action@v0.2.0

      - name: Fetch PR description and update backportrc
        env:
          GH_TOKEN: ${{ secrets.GH_ACCESS_TOKEN }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          REPO: ${{ github.repository }}
        run: |
          # Grab raw original PR body, gh CLI uses the default token.
          BODY_CONTENT="$(gh api "/repos/$REPO/pulls/$PR_NUMBER" | jq -r .body)"

          # Escape the markdown content so that sed can produce valid JSON.
          # Remove starting and ending quites and replace new lines with literals.
          ESCAPED_CONTENT=$(echo "$BODY_CONTENT" | jq -aRs .)
          ESCAPED_CONTENT="${ESCAPED_CONTENT%\"}"
          ESCAPED_CONTENT="${ESCAPED_CONTENT#\"}"
          ESCAPED_CONTENT=$(echo "$ESCAPED_CONTENT" | sed 's/[\/&]/\\&/g')

          # sourcePullRequest is an actual variable, but the PR description is not provided by the action or the CLI.
          # Instead we are using it as a substitution target and replacing it with the markdown content.
          sed -i "s/{{sourcePullRequest}}/$ESCAPED_CONTENT/g" .backportrc.json

      - name: Backport Action
        uses: sorenlouv/backport-github-action@v9.5.1
        with:
          github_token: ${{ secrets.GH_ACCESS_TOKEN }}
          auto_backport_label_prefix: backport-to-

      - name: Info log
        if: ${{ success() }}
        run: cat ~/.backport/backport.info.log

      - name: Debug log
        if: ${{ failure() }}
        run: cat ~/.backport/backport.debug.log