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# Ultralytics YOLOv5 🚀, AGPL-3.0 license
# Automatically merges repository 'main' branch into all open PRs to keep them up-to-date
# Action runs on updates to main branch so when one PR merges to main all others update

name: Merge main into PRs

on:
  workflow_dispatch:
  push:
    branches:
      - main
      - master

jobs:
  Merge:
    if: github.repository == 'ultralytics/yolov5'
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - uses: actions/setup-python@v5
        with:
          python-version: "3.11"
          cache: "pip" # caching pip dependencies
      - name: Install requirements
        run: |
          pip install pygithub
      - name: Merge main into PRs
        shell: python
        run: |
          from github import Github
          import os

          # Authenticate with the GitHub Token
          g = Github(os.getenv('GITHUB_TOKEN'))

          # Get the repository dynamically
          repo = g.get_repo(os.getenv('GITHUB_REPOSITORY'))

          # List all open pull requests
          open_pulls = repo.get_pulls(state='open', sort='created')

          for pr in open_pulls:
              # Compare PR head with main to see if it's behind
              try:
                  # Merge main into the PR branch
                  success = pr.update_branch()
                  assert success, "Branch update failed"
                  print(f"Merged 'master' into PR #{pr.number} ({pr.head.ref}) successfully.")
              except Exception as e:
                  print(f"Could not merge 'master' into PR #{pr.number} ({pr.head.ref}): {e}")
        env:
          GITHUB_TOKEN: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
          GITHUB_REPOSITORY: ${{ github.repository }}