migrator_uniqueness.yml

name: Check Migration Filename Uniqueness

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

jobs:
  migrator-name-uniqueness-check:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: read
    env:
      GH_TOKEN: ${{ github.token }}

    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0  # fetch full history so we can diff properly

      - name: Fetch base branch
        run: |
          git fetch origin ${{ github.base_ref }} --depth=1

      - name: Find newly added migration files
        id: find_migrators
        run: |
          # Diff only added files between base branch and PR HEAD
          new_migrators=$(git diff --name-only --diff-filter=A origin/${{ github.base_ref }}...HEAD | grep '^recipe/migrations/' || true)

          echo "Found new migrators:"
          echo "$new_migrators"

          echo "new_migrators=$new_migrators" >> $GITHUB_OUTPUT

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

            # Search in GH-org with exact path where migrators end up
            query=$(printf "org:conda-forge+path:.ci_support/migrations/$migrator" | jq -sRr @uri)
            response=$(curl -s -H "Accept: application/vnd.github+json" \
                             -H "Authorization: token $GH_TOKEN" \
                             "https://api.github.com/search/code?q=$query")
            echo "Sent $query"
            echo "Got $response"
            num_hits=$(echo "$response" | jq '[.items[] | select(.repository.archived == 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