polyline-algorithm-csharp/.github/workflows/backtrack.yml at main · petesramek/polyline-algorithm-csharp · GitHub

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name: 'Backtrack'

on:
  pull_request:
    types:
      - closed
    branches:
      - 'preview/**'
      - 'release/**'

permissions:
  actions: read
  contents: write

concurrency:
  group: backtrack-${{ github.base_ref }}
  cancel-in-progress: false

jobs:
  backtrack:
    name: 'Backtrack changes from ${{ github.base_ref }}'
    if: ${{ github.event.pull_request.merged == true }}
    runs-on: ubuntu-latest
    steps:
      - name: 'Checkout ${{ github.base_ref }}'
        uses: actions/checkout@v6
        with:
          ref: ${{ github.base_ref }}
          fetch-depth: 0
          token: ${{ secrets.GH_ADMIN_TOKEN }}

      - name: 'Configure git'
        uses: './.github/actions/git/configure-identity'

      - name: 'Resolve backtrack targets'
        id: targets
        run: |
          base_ref="${{ github.base_ref }}"
          if [[ "$base_ref" == preview/* ]]; then
            version="${base_ref#preview/}"
            echo "preview-branch=" >> $GITHUB_OUTPUT  # no intermediate branch; merge directly into develop
            echo "develop-branch=develop/$version" >> $GITHUB_OUTPUT
            echo "merge-source=$base_ref" >> $GITHUB_OUTPUT
          elif [[ "$base_ref" == release/* ]]; then
            version="${base_ref#release/}"
            echo "preview-branch=preview/$version" >> $GITHUB_OUTPUT
            echo "develop-branch=develop/$version" >> $GITHUB_OUTPUT
            echo "merge-source=preview/$version" >> $GITHUB_OUTPUT
          fi

      - name: 'Check if develop branch exists'
        id: check-develop
        run: |
          git fetch origin
          if git ls-remote --exit-code --heads origin "${{ steps.targets.outputs.develop-branch }}" > /dev/null 2>&1; then
            echo "exists=true" >> $GITHUB_OUTPUT
          else
            echo "exists=false" >> $GITHUB_OUTPUT
            echo "::warning::Develop branch '${{ steps.targets.outputs.develop-branch }}' not found, skipping backtrack."
          fi

      - name: 'Lock base branch'
        id: lock-base
        uses: './.github/actions/github/branch-protection/lock'
        with:
          branch: ${{ github.base_ref }}
          token: ${{ secrets.GH_ADMIN_TOKEN }}
          lock-branch: 'true'

      - name: 'Lock preview branch'
        id: lock-preview
        if: ${{ steps.targets.outputs.preview-branch != '' }}
        uses: './.github/actions/github/branch-protection/lock'
        with:
          branch: ${{ steps.targets.outputs.preview-branch }}
          token: ${{ secrets.GH_ADMIN_TOKEN }}
          lock-branch: 'true'

      - name: 'Lock develop branch'
        id: lock-develop
        if: ${{ steps.check-develop.outputs.exists == 'true' }}
        uses: './.github/actions/github/branch-protection/lock'
        with:
          branch: ${{ steps.targets.outputs.develop-branch }}
          token: ${{ secrets.GH_ADMIN_TOKEN }}
          lock-branch: 'true'

      - name: 'Unlock preview branch for merge'
        if: ${{ steps.targets.outputs.preview-branch != '' }}
        uses: './.github/actions/github/branch-protection/lock'
        with:
          branch: ${{ steps.targets.outputs.preview-branch }}
          token: ${{ secrets.GH_ADMIN_TOKEN }}
          lock-branch: 'false'
          skip-pull-request-reviews: 'true'

      - name: 'Backtrack: merge ${{ github.base_ref }} into ${{ steps.targets.outputs.preview-branch }}'
        if: ${{ steps.targets.outputs.preview-branch != '' }}
        env:
          GH_TOKEN: ${{ secrets.GH_ADMIN_TOKEN }}
        run: |
          gh api --method POST /repos/${{ github.repository }}/merges \
            --field base="${{ steps.targets.outputs.preview-branch }}" \
            --field head="${{ github.base_ref }}" \
            --field commit_message="Backtrack: merge ${{ github.base_ref }} into ${{ steps.targets.outputs.preview-branch }}"

      - name: 'Unlock develop branch for merge'
        if: ${{ steps.check-develop.outputs.exists == 'true' }}
        uses: './.github/actions/github/branch-protection/lock'
        with:
          branch: ${{ steps.targets.outputs.develop-branch }}
          token: ${{ secrets.GH_ADMIN_TOKEN }}
          lock-branch: 'false'
          skip-pull-request-reviews: 'true'

      - name: 'Backtrack: merge ${{ steps.targets.outputs.merge-source }} into ${{ steps.targets.outputs.develop-branch }}'
        if: ${{ steps.check-develop.outputs.exists == 'true' }}
        env:
          GH_TOKEN: ${{ secrets.GH_ADMIN_TOKEN }}
        run: |
          gh api --method POST /repos/${{ github.repository }}/merges \
            --field base="${{ steps.targets.outputs.develop-branch }}" \
            --field head="${{ steps.targets.outputs.merge-source }}" \
            --field commit_message="Backtrack: merge ${{ steps.targets.outputs.merge-source }} into ${{ steps.targets.outputs.develop-branch }}"

      - name: 'Restore protection: base branch'
        if: ${{ always() && steps.lock-base.outcome == 'success' }}
        uses: './.github/actions/github/branch-protection/unlock'
        with:
          branch: ${{ github.base_ref }}
          token: ${{ secrets.GH_ADMIN_TOKEN }}
          fail-on-error: 'true'

      - name: 'Restore protection: preview branch'
        if: ${{ always() && steps.lock-preview.outcome == 'success' }}
        uses: './.github/actions/github/branch-protection/unlock'
        with:
          branch: ${{ steps.targets.outputs.preview-branch }}
          token: ${{ secrets.GH_ADMIN_TOKEN }}
          fail-on-error: 'true'

      - name: 'Restore protection: develop branch'
        if: ${{ always() && steps.lock-develop.outcome == 'success' }}
        uses: './.github/actions/github/branch-protection/unlock'
        with:
          branch: ${{ steps.targets.outputs.develop-branch }}
          token: ${{ secrets.GH_ADMIN_TOKEN }}
          fail-on-error: 'true'

      - name: 'Write backtrack summary'
        if: ${{ always() }}
        run: |
          echo "## 🔁 Backtrack Summary" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "| Branch | Merged from |" >> $GITHUB_STEP_SUMMARY
          echo "|--------|-------------|" >> $GITHUB_STEP_SUMMARY
          if [[ "${{ steps.targets.outputs.preview-branch }}" != "" ]]; then
            echo "| \`${{ steps.targets.outputs.preview-branch }}\` | \`${{ github.base_ref }}\` |" >> $GITHUB_STEP_SUMMARY
          fi
          if [[ "${{ steps.check-develop.outputs.exists }}" == "true" ]]; then
            echo "| \`${{ steps.targets.outputs.develop-branch }}\` | \`${{ steps.targets.outputs.merge-source }}\` |" >> $GITHUB_STEP_SUMMARY
          fi