close-fork-pr.yml

name: Close PRs from Forks

on:
  pull_request_target:
    types:
      - opened
      - synchronize

jobs:
  check-fork:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    steps:
      - name: Check if PR is from a fork
        id: check
        run: |
          echo "PR head repo: ${{ github.event.pull_request.head.repo.full_name }}"
          echo "Base repo: ${{ github.event.repository.full_name }}"
          if [[ "${{ github.event.pull_request.head.repo.full_name }}" != "${{ github.event.repository.full_name }}" ]]; then
            echo "PR is from a fork"
            echo "is_fork=true" >> $GITHUB_ENV
          else
            echo "PR is not from a fork"
            echo "is_fork=false" >> $GITHUB_ENV
          fi

      - name: Close PR and add comment
        if: env.is_fork == 'true'
        run: |
          PR_NUMBER=${{ github.event.pull_request.number }}
          GH_REPO=${{ github.repository }}
          echo "Closing PR #$PR_NUMBER in repository $GH_REPO"
          gh pr close \
            "$PR_NUMBER" \
            --repo "${{ github.repository }}" \
            --comment "This PR has been closed because PRs from forks are not allowed. Please create a branch directly off the origin repository and resubmit your PR."
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}