helm-test.yaml

name: Lint/Test Helm charts

on:
  pull_request:
    branches: [ "main" ]
    paths:
      - 'charts/**'

jobs:
  find_directories:
    name: Find changed helm charts
    runs-on: ubuntu-latest
    outputs:
      directories: ${{ steps.find_directories.outputs.build_matrix }}
    steps:
      - name: Check out the repo
        uses: actions/checkout@v4
      - name: Check out the coredb repo to reuse some actions
        uses: actions/checkout@v4
        with:
          repository: tembo-io/tembo
          path: ./.tembo
          ref: 84664df742ce9774a3029e08111940f9f1fb345e
      - name: Find directories with Chart.yaml that changed
        id: find_directories
        uses: ./.tembo/.github/actions/find-changed-directories
        with:
          contains_the_file: Chart.yaml
          changed_relative_to_branch: ${{ github.base_ref || 'not-a-branch' }}
          ignore_dirs: ".tembo"

  # We can check versions using ct, but there is a bug checking 1 chart. So lets
  # just do it this way for now.
  # https://github.com/helm/chart-testing/pull/594
  check_version:
    name: Check Helm chart version
    runs-on: ubuntu-latest
    needs:
      - find_directories
    strategy:
      matrix: ${{ fromJson(needs.find_directories.outputs.directories) }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          path: 'code'

      - name: Fetch main branch
        run: |
          cd code
          git fetch origin main:main

      - name: Check chart version
        run: |
          cd code
          CURR_VERSION=$(cat ${{ matrix.path }}/Chart.yaml | grep version: | cut -d ' ' -f 2)
          MAIN_VERSION=$(git show main:${{ matrix.path }}/Chart.yaml 2>/dev/null | grep version: | cut -d ' ' -f 2 || echo "")

          echo -n "Current version: ${CURR_VERSION}\n"
          echo -n "Previous version: ${MAIN_VERSION}\n"

          if [ -z "$MAIN_VERSION" ]; then
            echo "Chart not found in the main branch. Continuing..."
            exit 0
          fi

          if [ "$CURR_VERSION" = "$MAIN_VERSION" ]; then
            echo "Helm chart ${{ matrix.path }} version is unchanged and needs to be bumped!"
            exit 1
          fi

          LOWEST_VERSION=$(printf "%s\n%s" "$CURR_VERSION" "$MAIN_VERSION" | sort -V | head -n1)
          if [ "$LOWEST_VERSION" != "$MAIN_VERSION" ]; then
            echo "Helm chart version has been downgraded, please bump it!"
            exit 1
          fi

  lint:
    name: Lint charts
    runs-on: ubuntu-latest
    needs:
      - find_directories
      - check_version
    strategy:
      fail-fast: false
      matrix: ${{ fromJson(needs.find_directories.outputs.directories) }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Helm lint
        run: helm lint ${{ matrix.path }}

  lint-ct:
    name: Lint using chart-testing
    runs-on: ubuntu-latest
    needs:
      - find_directories
      - check_version
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      # Python is required because `ct lint` runs Yamale (https://github.com/23andMe/Yamale) and
      # yamllint (https://github.com/adrienverge/yamllint) which require Python
      - name: Set up Python
        uses: actions/setup-python@v4 #
        with:
          python-version: 3.x

      - name: Set up Helm
        uses: azure/setup-helm@v3.5
        with:
          version: 3.13.2

      - name: Set up chart-testing
        uses: helm/chart-testing-action@v2.6.1

      - name: Install just
        uses: extractions/setup-just@v1
      - run: just helm-repo

      - name: Run chart-testing (list-changed)
        id: list-changed
        run: |
          changed=$(ct list-changed --target-branch main)
          if [[ -n "$changed" ]]; then
            echo "changed=true" >> $GITHUB_OUTPUT
          fi

      - name: Run chart-testing linter
        if: steps.list-changed.outputs.changed == 'true'
        run: ct lint --config ct.yaml

  test:
    name: Test using chart-testing
    runs-on: ubuntu-latest
    needs: lint-ct
    # if: needs.lint-ct.outputs.changed == 'true'
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Set up Helm
        uses: azure/setup-helm@v3.5
        with:
          version: 3.13.2

      - name: Set up chart-testing
        uses: helm/chart-testing-action@v2.6.1

      - uses: extractions/setup-just@v1
      - run: just helm-repo
      - name: Install kind cluster
        uses: helm/kind-action@v1.8.0
        with:
          install_only: true
      - name: Start kind cluster
        run: just start-kind

      - name: Run helm chart tests
        run: ct install --config ct.yaml