OliveTin/.github/workflows/check-target.yml

name: Check target

# Only release PRs (next -> main, from this repository) may target main.
# Features, fixes and docs must target next. This runs on every PR so that it
# can be a required status check; PRs that do not target main always pass.

on:
  pull_request:
    types:
      - opened
      - reopened
      - synchronize
      - edited

permissions: {}

jobs:
  check-target:
    runs-on: ubuntu-latest
    steps:
      - name: Check target branch
        env:
          BASE_REF: ${{ github.event.pull_request.base.ref }}
          HEAD_REF: ${{ github.event.pull_request.head.ref }}
          HEAD_REPO: ${{ github.event.pull_request.head.repo.full_name }}
          THIS_REPO: ${{ github.repository }}
        run: |
          if [ "$BASE_REF" != "main" ]; then
            echo "PR targets '$BASE_REF', OK."
            exit 0
          fi

          if [ "$HEAD_REPO" = "$THIS_REPO" ] && [ "$HEAD_REF" = "next" ]; then
            echo "Release PR from next to main, OK."
            exit 0
          fi

          echo "::error title=Wrong target branch::Only release PRs from 'next' may target 'main'. Please edit this PR and change its base branch to 'next'."
          exit 1