close-master-pr.yml

# Copyright (c) 2025, Zededa, Inc.
# SPDX-License-Identifier: Apache-2.0
---
name: Close PRs from master

on:  # yamllint disable-line rule:truthy
  pull_request_target:
    types: [opened, reopened]

jobs:
  close-master-pr:
    runs-on: ubuntu-latest
    steps:
      - name: Close PR if from master
        if: github.event.pull_request.head.ref == 'master' || github.event.pull_request.head.ref == 'main'
        run: |
          # 1) Close the PR via GitHub API
          curl -s -X PATCH \
            -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
            -H "Accept: application/vnd.github.v3+json" \
            -d '{"state":"closed"}' \
            "https://api.github.com/repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}"

          # 2) Add a comment explaining why
          COMMENT_PAYLOAD=$(cat <<EOF
          {
            "body": "🚨 Hey there!  We automatically close PRs from the \`master\` branch.\n\n\
            Please create a dedicated feature branch instead. Follow these steps to do it properly:\n\n\
            1. Add the upstream repository if you haven't already:\n\n\
            \`\`\`sh\n\
            git remote add upstream https://github.com/${{ github.repository }}.git\n\
            \`\`\`\n\
            2. Add your fork as a separate remote:\n\n\
            \`\`\`sh\n\
            git remote add myfork ${{ github.event.pull_request.head.repo.clone_url }}\n\
            \`\`\`\n\
            3. Fetch the latest changes from the upstream repository:\n\n\
            \`\`\`sh\n\
            git fetch upstream\n\
            \`\`\`\n\
            4. Rebase your \`master\` branch on top of the upstream \`master\`:\n\n\
            \`\`\`sh\n\
            git rebase upstream/master\n\
            \`\`\`\n\
            5. Create a new feature branch from the updated \`master\`:\n\n\
            \`\`\`sh\n\
            git checkout -b feature/my-change\n\
            \`\`\`\n\
            6. Reset \`master\` to match the upstream version without affecting your feature branch:\n\n\
            \`\`\`sh\n\
            git branch -f master upstream/master\n\
            \`\`\`\n\
            7. Push the new feature branch to your fork:\n\n\
            \`\`\`sh\n\
            git push myfork feature/my-change\n\
            \`\`\`\n\n\
            Finally, open a new pull request from your \`feature/my-change\` branch.\n\n\
            Please also review our [contributing guidelines](https://github.com/${{ github.repository }}/blob/master/CONTRIBUTING.md).\n\n\
            Thanks!"
          }
          EOF
          )

          curl -s -X POST \
            -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
            -H "Accept: application/vnd.github.v3+json" \
            -d "$COMMENT_PAYLOAD" \
            "https://api.github.com/repos/${{ github.repository }}/issues/${{ github.event.pull_request.number }}/comments"