label-check.yml

# This GitHub Actions workflow is designed to automatically check pull requests in the cBioPortal repository for valid labels before they can be merged.
# The workflow ensures that pull requests have labels that are defined in the .github/release-drafter.yml file's "categories" section.
# If a pull request lacks a valid label, the workflow will fail, preventing the merge until valid labels are applied.
name: Label Check

on:
  pull_request:
    types:
      - opened
      - synchronize

jobs:
  label-check:
    runs-on: ubuntu-latest
    steps:
      - name: Check PR Labels
        uses: actions/checkout@v2

      - name: Install dependencies
        run: |
          wget https://github.com/mikefarah/yq/releases/download/v4.34.2/yq_linux_amd64 -O /usr/local/bin/yq
          chmod +x /usr/local/bin/yq

      - name: Get Labels from release-drafter.yml
        id: get_labels
        run: |
          curl -s "https://raw.githubusercontent.com/cBioPortal/cbioportal-frontend/master/.github/release-drafter.yml" | \
            yq -r '.categories[].labels[]' > labels.txt

      - name: Check Labels
        id: check_labels
        run: |
          PR_NUMBER=$(jq -r ".number" $GITHUB_EVENT_PATH)
          PR_LABELS=$(curl -s "https://api.github.com/repos/${{ github.repository }}/pulls/$PR_NUMBER" | \
                       jq -r '.labels[].name')

          mapfile -t AVAILABLE_LABELS < labels.txt

          for LABEL in ${PR_LABELS[@]}; do
            if [[ "$LABEL" == "skip-changelog" ]]; then
              echo "PR contains a valid label: skip-changelog"
              exit 0  # Valid label found, exit successfully
            fi
            for AVAILABLE_LABEL in "${AVAILABLE_LABELS[@]}"; do
              if [[ "$AVAILABLE_LABEL" == "$LABEL" ]]; then
                echo "PR contains a valid label: $LABEL"
                exit 0  # Valid label found, exit successfully
              fi
            done
          done

          echo "No valid label found on PR."
          echo "Available label options from release-drafter.yml:"
          cat labels.txt
          exit 1  # No valid label found, exit with an error