protect-default-branch.yaml

name: Validate PR head branch
on:
  pull_request:
    branches:
      - "ros2"

jobs:
  check-head-branch:
    runs-on: ubuntu-latest
    steps:
      - name: Check allowed branches
        run: |
          pattern="^[0-9]+\.[0-9]+\.[0-9]+-[0-9]{8}$" # This regex matches the X.X.X-YYYYMMDD pattern
          if [[ "${{ github.head_ref }}" == *"hotfix"* ]]; then
            echo "PR from a branch containing 'hotfix' is allowed."
            exit 0
          elif [[ "${{ github.head_ref }}" =~ $pattern ]]; then
            echo "PR from a branch matching X.X.X-YYYYMMDD pattern is allowed."
            exit 0
          else
            echo "PRs must come from branches containing 'hotfix' phrase or matching X.X.X-YYYYMMDD pattern."
            exit 1
          fi