sync-upstream.yml

name: Sync upstream

on:
  schedule:
    - cron: '0 */6 * * *' # Every 6 hours, at minute 0
  workflow_dispatch: # allow manual trigger

jobs:
  sync:
    runs-on: ubuntu-latest
    # Only run on forks to prevent running on the original repo
    if: github.event.repository.fork
    
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          # Fetch full history for proper merging
          fetch-depth: 0
          # Use a token with appropriate permissions
          token: ${{ secrets.GITHUB_TOKEN }}

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

      - name: Add upstream and sync
        run: |
          git remote add upstream https://github.com/webmachinelearning/webnn-docs.git
          git fetch upstream
          
          # Check if there are actually changes to merge
          if git merge-base --is-ancestor upstream/main HEAD; then
            echo "Already up to date"
            exit 0
          fi
          
          git checkout main
          
          # Try to merge, exit gracefully if there are conflicts
          if ! git merge upstream/main --no-edit; then
            echo "Merge conflicts detected. Manual intervention required."
            git merge --abort
            exit 1
          fi
          
          git push origin main

      - name: Clean up
        if: always()
        run: |
          if git remote | grep -q upstream; then
            git remote remove upstream
          fi

      - name: Create issue on conflict
        if: failure()
        uses: actions/github-script@v7
        with:
          script: |
            github.rest.issues.create({
              owner: context.repo.owner,
              repo: context.repo.repo,
              title: 'Upstream sync failed due to merge conflicts',
              body: `The automatic upstream sync failed due to merge conflicts.
              
              Please manually resolve the conflicts by:
              1. \`git remote add upstream https://github.com/webmachinelearning/webnn-docs.git\`
              2. \`git fetch upstream\`
              3. \`git merge upstream/main\`
              4. Resolve conflicts and commit
              5. \`git push origin main\`
              
              Workflow run: ${context.serverUrl}/${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId}`
            })