migrator_uniqueness.yml

name: Check Migration Filename Uniqueness

on:
  pull_request:
    types: [opened, synchronize, reopened]

jobs:
  migration-check:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: read

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Find new migration files
        id: find_files
        run: |
          # Compare PR branch against base, only include added files
          files=$(git diff --name-only --diff-filter=A origin/${{ github.base_ref }}...HEAD | grep '^recipe/migrations/' || true)

          echo "new_migrators=$new_migrators" >> $GITHUB_OUTPUT

      - name: Search for existing uses of that migrator in conda-forge
        if: steps.find_files.outputs.new_migrators != ''
        run: |
          failed=0
          for m in ${new_migrators}; do
            migrator=$(basename "$m")
            echo "Checking for existing uses of migrator $migrator in conda-forge..."

            # Search in GH-org with exact path where migrators end up
            num_hits=$(gh search code "org:conda-forge path:.ci_support/migrations/$migrator" --json repository --jq 'map(select(.repository.isArchived == false)) | length')

            if [ "$num_hits" -gt 0 ]; then
              echo "Found $num_hits existing occurrences of migrator $migrator in conda-forge"
              failed=1
            else
              echo "No existing occurrences of $migrator found"
            fi
          done

          if [ "$failed" -eq 1 ]; then
            echo "Pre-existing uses of migration filename(s) found in conda-forge."
            exit 1
          fi