ct.sh

#!/usr/bin/env bash

set -o errexit
set -o nounset
set -o pipefail

DEFAULT_CHART_TESTING_VERSION=3.11.0
DEFAULT_YAMLLINT_VERSION=1.33.0
DEFAULT_YAMALE_VERSION=4.0.4

show_help() {
cat << EOF
Usage: $(basename "$0") <options>

    -h, --help          Display help
    -v, --version       The chart-testing version to use (default: ${DEFAULT_CHART_TESTING_VERSION})"
EOF
}

main() {
    local version="${DEFAULT_CHART_TESTING_VERSION}"
    local yamllint_version="${DEFAULT_YAMLLINT_VERSION}"
    local yamale_version="${DEFAULT_YAMALE_VERSION}"

    parse_command_line "$@"

    install_chart_testing
}

parse_command_line() {
    while :; do
        case "${1:-}" in
            -h|--help)
                show_help
                exit
                ;;
            -v|--version)
                if [[ -n "${2:-}" ]]; then
                    version="${2#v}"
                    shift
                else
                    echo "ERROR: '-v|--version' cannot be empty." >&2
                    show_help
                    exit 1
                fi
                ;;
            --yamllint-version)
                if [[ -n "${2:-}" ]]; then
                    yamllint_version="$2"
                    shift
                else
                    echo "ERROR: '--yamllint-version' cannot be empty." >&2
                    show_help
                    exit 1
                fi
                ;;
            --yamale-version)
                if [[ -n "${2:-}" ]]; then
                    yamale_version="$2"
                    shift
                else
                    echo "ERROR: '--yamale-version' cannot be empty." >&2
                    show_help
                    exit 1
                fi
                ;;
            *)
                break
                ;;
        esac

        shift
    done
}

install_chart_testing() {
    if [[ ! -d "${RUNNER_TOOL_CACHE}" ]]; then
        echo "Cache directory '${RUNNER_TOOL_CACHE}' does not exist" >&2
        exit 1
    fi

    local arch
    if [[ $(uname -m) == "aarch64" ]]; then
      arch=arm64
    else
      arch=amd64
    fi
    local cache_dir="${RUNNER_TOOL_CACHE}/ct/${version}/${arch}"
    local venv_dir="${cache_dir}/venv"

    if [[ ! -d "${cache_dir}" ]]; then
        mkdir -p "${cache_dir}"

        echo "Installing chart-testing v${version}..."
        CT_CERT=https://github.com/helm/chart-testing/releases/download/v$version/chart-testing_${version#v}_linux_$arch.tar.gz.pem
        CT_SIG=https://github.com/helm/chart-testing/releases/download/v$version/chart-testing_${version#v}_linux_$arch.tar.gz.sig

        curl --retry 5 --retry-delay 1 -sSLo ct.tar.gz "https://github.com/helm/chart-testing/releases/download/v$version/chart-testing_${version#v}_linux_$arch.tar.gz"
        cosign verify-blob --certificate $CT_CERT --signature $CT_SIG \
          --certificate-identity "https://github.com/helm/chart-testing/.github/workflows/release.yaml@refs/heads/main" \
          --certificate-oidc-issuer "https://token.actions.githubusercontent.com" ct.tar.gz
        retVal=$?
        if [[ "${retVal}" -ne 0 ]]; then
          log_error "Unable to validate chart-testing version: v${version}"
          exit 1
        fi

        tar -xzf ct.tar.gz -C "${cache_dir}"
        rm -f ct.tar.gz

        echo 'Creating virtual Python environment...'
        python3 -m venv "${venv_dir}"

        echo 'Activating virtual environment...'
        # shellcheck disable=SC1090
        source "${venv_dir}/bin/activate"

        echo 'Installing yamllint...'
        pip3 install "yamllint==${yamllint_version}"

        echo 'Installing Yamale...'
        pip3 install "yamale==${yamale_version}"
    fi

    # https://github.com/helm/chart-testing-action/issues/62
    echo 'Adding ct directory to PATH...'
    echo "${cache_dir}" >> "${GITHUB_PATH}"

    echo 'Setting CT_CONFIG_DIR...'
    echo "CT_CONFIG_DIR=${cache_dir}/etc" >> "${GITHUB_ENV}"

    echo 'Configuring environment variables for virtual environment for subsequent workflow steps...'
    echo "VIRTUAL_ENV=${venv_dir}" >> "${GITHUB_ENV}"
    echo "${venv_dir}/bin" >> "${GITHUB_PATH}"

    "${cache_dir}/ct" version
}

main "$@"