rebase-upstream.yml

name: Rebase onto Upstream

on:
  schedule:
    - cron: '0 * * * *'  # ⏰ Every hour
  push:
    branches:
      - main
  pull_request:
    branches:
      - main
  workflow_dispatch:

jobs:
  rebase:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout your forked main branch
        uses: actions/checkout@v4
        with:
          ref: subshell-5
          fetch-depth: 0  # Needed to rebase properly

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

      - name: Add upstream remote
        run: |
          git remote add upstream https://github.com/denoland/deno.git
          git fetch upstream

      - name: Create backup branch (in case of conflict)
        run: |
          git branch backup-main-before-rebase

      - name: Attempt rebase onto upstream/main
        id: rebase
        run: |
          if git rebase upstream/main; then
            echo "Rebase successful"
          else
            echo "Rebase conflict, aborting..."
            git rebase --abort
            git reset --hard backup-main-before-rebase
            echo "REBASE_FAILED=true" >> $GITHUB_ENV
          fi

      - name: Check if HEAD is updated after rebase
        id: head_check
        run: |
          CURRENT_HEAD=$(git rev-parse HEAD)
          git fetch origin subshell-5
          REMOTE_HEAD=$(git rev-parse origin/subshell-5)
          if [ "$CURRENT_HEAD" != "$REMOTE_HEAD" ]; then
            echo "HEAD_UPDATED=true" >> $GITHUB_ENV
          else
            echo "HEAD_UPDATED=false" >> $GITHUB_ENV
          fi

      - name: Push changes if rebase was successful
        if: env.REBASE_FAILED != 'true'
        run: |
          git push origin subshell-5 --force

      - name: Cleanup backup branch
        if: always()
        run: |
          git branch -D backup-main-before-rebase || true