check-pr-base.yml

name: Git tree checks

on:
  pull_request:
    types: [opened, edited, reopened, synchronize]

permissions:
  pull-requests: write
  contents: read

jobs:
  check_base_ref:
    name: Release branch restriction
    runs-on: ubuntu-latest
    steps:
      - name: Change base to master if needed
        if: |
          github.event_name == 'pull_request' &&
          github.event.pull_request.base.ref == 'release/latest' &&
          ! startsWith(github.event.pull_request.head.ref, 'release/')
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          echo 'Updating PR '"#${{ github.event.pull_request.number }}"' to use base `master`'
          echo 'If you do want to release your changes directly by merging into `release/latest`, your branch must start with `release/`.'

          curl -X PATCH \
            -H "Authorization: Bearer $GITHUB_TOKEN" \
            -H "Accept: application/vnd.github+json" \
            https://api.github.com/repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }} \
            -d '{"base": "master"}'