testmerge.yml

name: 'Testmerge Worker'

concurrency:
  group: testmerge

on:
  workflow_dispatch:

env:
  BASE_BRANCH: master220
  TESTMERGE_BRANCH: testmerge2
  REQUIRED_LABEL: testmerge

jobs:
  process:
    runs-on: ubuntu-latest
    steps:
      - name: Get pull requests with required label and check for merge conflicts
        id: get_labeled_prs
        uses: actions/github-script@v7
        with:
          script: |
            const label_needed = '${{ env.REQUIRED_LABEL }}';
            const { data: pullRequests } = await github.rest.pulls.list({
              owner: context.repo.owner,
              repo: context.repo.repo,
              state: 'open',
            });
            const labeledPRs = [];
            for (const pr of pullRequests) {
              if (pr.labels.some(label => label.name === label_needed)) {
                const prInfo = await github.rest.pulls.get({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  pull_number: pr.number
                });
                if (prInfo.data.mergeable) {
                  labeledPRs.push({
                    number: pr.number,
                    title: pr.title
                  });
                }
              }
            }
            const prDetails = JSON.stringify(labeledPRs);
            console.log(`Pull Requests with the label "${label_needed}" and no merge conflicts: ${prDetails}`);
            if (prDetails.length == 0) {
              core.setFailed(`No pull requests with the label "${label_needed}" and no merge conflicts found.`);
            }
            core.setOutput('labeled_pr_details', prDetails);
      - name: Git checkout
        uses: actions/checkout@v4
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          fetch-depth: 0
          ref: ${{ env.BASE_BRANCH }}
      - name: Iterate over PRs and perform actions
        id: prepare_testmerge_branch
        run: |
          set -e

          git config --local user.email "action@github.com"
          git config --local user.name "Testmerge Worker"
          git switch ${{ env.TESTMERGE_BRANCH }} || git switch -c ${{ env.TESTMERGE_BRANCH }}

          # Print debug information
          echo "PR details JSON:"
          echo '${{ steps.get_labeled_prs.outputs.labeled_pr_details }}'

          echo '${{ steps.get_labeled_prs.outputs.labeled_pr_details }}' | jq -c '.[]' | while read -r PR_DETAIL; do
            PR_NUMBER=$(echo "$PR_DETAIL" | jq -r '.number')
            PR_TITLE=$(echo "$PR_DETAIL" | jq -r '.title')
            echo "Preparing $PR_TITLE (#$PR_NUMBER)"

            git fetch origin pull/$PR_NUMBER/head:pr-$PR_NUMBER

            # Check for merge conflicts
            git merge --no-commit --no-ff pr-$PR_NUMBER || true
            CONFLICTS=$(git ls-files -u | wc -l)
            if [ "$CONFLICTS" -gt 0 ] ; then
              echo "There is a merge conflict. Skipping $PR_TITLE (#$PR_NUMBER)"
              git merge --abort
              continue
            fi
            git merge --abort

            git merge --squash pr-$PR_NUMBER
            git commit -m "$PR_TITLE (#$PR_NUMBER) [testmerge]"

            # Perform your git actions here, for example:
            echo "Successfully merged $PR_TITLE (#$PR_NUMBER)"
          done

          git push origin ${{ env.TESTMERGE_BRANCH }}