sync.yml

name: Sync with upstream
on:
  schedule:
    - cron: '0 3 * * 0'  #
  workflow_dispatch:

jobs:
  sync:
    runs-on: ubuntu-latest
    permissions:
      contents: write  # Needed to push to your repo
    steps:
      - name: Checkout repo
        uses: actions/checkout@v4
        with:
          fetch-depth: 0  # Fetch full history for proper syncing

      - name: Set up Git
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"



      - name: Get parent (upstream) repo full name
        id: get-upstream
        run: |
          repo="${{ github.repository }}"
          parent=$(gh api repos/$repo --jq '.parent.full_name // empty' 2>/dev/null)
          if [ -z "$parent" ]; then
            echo "❌ No upstream repository found. This repository may not be a fork."
            echo "💡 This workflow only works with forked repositories."
            exit 1
          fi
          echo "parent=$parent" >> "$GITHUB_OUTPUT"
          echo "🔍 Found upstream repository: $parent"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}


      - name: Add upstream and fetch
        run: |
          git remote add upstream https://github.com/${{ steps.get-upstream.outputs.parent }}.git
          git fetch upstream

      - name: Get default branch names
        id: get-branches
        run: |
          # Get upstream default branch
          upstream_branch=$(git remote show upstream | grep 'HEAD branch' | cut -d' ' -f5)
          # Get origin default branch
          origin_branch=$(git remote show origin | grep 'HEAD branch' | cut -d' ' -f5)

          echo "upstream_branch=$upstream_branch" >> "$GITHUB_OUTPUT"
          echo "origin_branch=$origin_branch" >> "$GITHUB_OUTPUT"
          echo "🔍 Upstream default branch: $upstream_branch"
          echo "🔍 Origin default branch: $origin_branch"

      - name: Sync with upstream
        run: |
          upstream_branch="${{ steps.get-branches.outputs.upstream_branch }}"
          origin_branch="${{ steps.get-branches.outputs.origin_branch }}"

          # Checkout the appropriate branch
          if [ "$upstream_branch" = "$origin_branch" ]; then
            git checkout "$origin_branch"
          else
            echo "⚠️ Branch mismatch: upstream uses '$upstream_branch', origin uses '$origin_branch'"
            echo "Syncing upstream/$upstream_branch to origin/$origin_branch"
            git checkout "$origin_branch"
          fi

          # Attempt fast-forward merge
          echo "🔄 Attempting to sync with upstream/$upstream_branch..."
          if git merge --ff-only upstream/$upstream_branch; then
            echo "✅ Successfully synced with upstream"
            echo "sync_success=true" >> "$GITHUB_OUTPUT"
          else
            echo "⚠️ Cannot fast-forward merge. Manual intervention may be required."
            echo "This usually means there are local commits that conflict with upstream changes."
            echo "sync_success=false" >> "$GITHUB_OUTPUT"

            # Show the divergence
            echo "📊 Commit comparison:"
            git log --oneline --graph --decorate --all -10

            # Reset to avoid leaving repo in bad state
            git merge --abort 2>/dev/null || true
            exit 1
          fi
        id: sync

      - name: Push to origin
        if: steps.sync.outputs.sync_success == 'true'
        run: |
          origin_branch="${{ steps.get-branches.outputs.origin_branch }}"
          echo "📤 Pushing changes to origin/$origin_branch..."
          git push origin "$origin_branch"
          echo "✅ Successfully pushed changes to origin"

      - name: Create summary
        if: always()
        run: |
          if [ "${{ steps.sync.outputs.sync_success }}" = "true" ]; then
            echo "## ✅ Sync Successful" >> $GITHUB_STEP_SUMMARY
            echo "Repository has been successfully synced with upstream." >> $GITHUB_STEP_SUMMARY
          else
            echo "## ⚠️ Sync Failed" >> $GITHUB_STEP_SUMMARY
            echo "Could not sync with upstream. Manual intervention may be required." >> $GITHUB_STEP_SUMMARY
            echo "This typically happens when there are conflicting local commits." >> $GITHUB_STEP_SUMMARY
          fi
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "**Upstream:** ${{ steps.get-upstream.outputs.parent }}" >> $GITHUB_STEP_SUMMARY
          echo "**Timestamp:** $(date -u)" >> $GITHUB_STEP_SUMMARY