sync-master.yml

---
name: Sync default branches
on:  # yamllint disable-line rule:truthy
  schedule:
    - cron: '0 0 * * 1'  # weekly on Monday
  workflow_dispatch:
  pull_request:
    paths:
      - '.github/workflows/sync-master.yml'

jobs:
  sync-branches:
    runs-on: ubuntu-latest
    permissions:
      contents: write
    if: github.repository == 'dbt-msft/dbt-sqlserver'
    steps:
      - uses: actions/checkout@v7
        with:
          fetch-depth: 0
          ref: master
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Sync main to master
        run: |
          git config user.name 'github-actions[bot]'
          git config user.email 'github-actions[bot]@users.noreply.github.com'
          git checkout -B main origin/main 2>/dev/null || git checkout -b main
          if git merge --ff-only origin/master; then
            echo "HAS_CHANGES=true" >> "$GITHUB_ENV"
          else
            echo "HAS_CHANGES=false" >> "$GITHUB_ENV"
          fi

      - name: Push main
        if: env.HAS_CHANGES == 'true' && github.event_name != 'pull_request'
        run: git push origin main

        # After default branch is switched to main, swap the logic above:
        #   - checkout main, sync master <- main, push master