check-reference.yml

name: Check patch references

on:
  push:
    branches-ignore:
      - dependabot/**
  schedule:
    # Once every day at midnight UTC
    - cron: "0 0 * * *"

jobs:
  stale:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout patches
        uses: actions/checkout@v4

      - name: Checkout core
        uses: actions/checkout@v4
        with:
          repository: 'homebrew/homebrew-core'
          path: homebrew-core

      - name: Detect references
        run: |
          patches=$(find -name "*.patch")
          status=0
          for patch in $patches; do
            if ! git -C "homebrew-core" grep -r "${patch/./}" > /dev/null; then
              echo "$patch not needed!"
              status=1
            fi
          done
          exit $status