quay/.github/workflows/label-backported-pr.yml

name: Label Original PR on Backport Merge

on:
  pull_request:
    types: [closed]
    branches:
      - 'redhat-*'

jobs:
  label-original-pr:
    name: Add backported label to original PR
    runs-on: ubuntu-latest
    if: github.event.pull_request.merged == true

    permissions:
      contents: read
      pull-requests: write
      issues: write

    steps:
      - name: Label original PR as backported
        uses: actions/github-script@v8
        with:
          script: |
            const prBody = context.payload.pull_request.body || '';
            const targetBranch = context.payload.pull_request.base.ref;

            // Extract original PR number from body: "cherry-pick of #1234"
            const match = prBody.match(/cherry-pick of #(\d+)/i);
            if (!match) {
              console.log('No original PR reference found in body:', prBody);
              return;
            }

            const originalPrNumber = parseInt(match[1], 10);
            const labelName = `backported/${targetBranch}`;

            console.log(`Cherry-pick PR #${context.payload.pull_request.number} merged to ${targetBranch}`);
            console.log(`Adding label "${labelName}" to original PR #${originalPrNumber}`);

            // Ensure the label exists (create if needed)
            try {
              await github.rest.issues.getLabel({
                owner: context.repo.owner,
                repo: context.repo.repo,
                name: labelName,
              });
            } catch (error) {
              if (error.status === 404) {
                console.log(`Creating label "${labelName}"`);
                await github.rest.issues.createLabel({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  name: labelName,
                  color: '0E8A16', // Green to indicate successful backport
                  description: `Backported to ${targetBranch}`,
                });
              } else {
                throw error;
              }
            }

            // Add label to original PR
            await github.rest.issues.addLabels({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: originalPrNumber,
              labels: [labelName],
            });

            console.log(`Successfully labeled PR #${originalPrNumber} with "${labelName}"`);