ROOTDIR=$(dirname "${SCRIPTPATH}")
cd "${ROOTDIR}"

# Get the sha of top commit
# $1 = repo
function getSha() {
  local dir result
  dir=$(mktemp -d)
  git clone --depth=1 "https://github.com/istio/${1}.git" -b "${UPDATE_BRANCH}" "${dir}"

  result="$(cd "${dir}" && git rev-parse HEAD)"
  rm -rf "${dir}"

  echo "${result}"
}

ISTIO_ENVOY_LINUX_DEBUG_DIR="${ISTIO_ENVOY_LINUX_DEBUG_DIR:-${TARGET_OUT_LINUX}/debug}"
ISTIO_ENVOY_LINUX_DEBUG_NAME="${ISTIO_ENVOY_LINUX_DEBUG_NAME:-envoy-debug-${ISTIO_ENVOY_LINUX_VERSION}}"
ISTIO_ENVOY_LINUX_DEBUG_PATH="${ISTIO_ENVOY_LINUX_DEBUG_PATH:-${ISTIO_ENVOY_LINUX_DEBUG_DIR}/${ISTIO_ENVOY_LINUX_DEBUG_NAME}}"

ISTIO_ENVOY_LINUX_RELEASE_DIR="${ISTIO_ENVOY_LINUX_RELEASE_DIR:-${TARGET_OUT_LINUX}/release}"

      return 1
      ;;
  esac

  # If metrics server configuration directory is specified then deploy in
  # the cluster just created
  if [[ -n ${METRICS_SERVER_CONFIG_DIR:-} ]]; then
    retry kubectl apply -f "${METRICS_SERVER_CONFIG_DIR}"
  fi

  # Install Metallb if not set to install explicitly
  if [[ -z "${NOMETALBINSTALL}" ]]; then
    retry install_metallb ""
  fi

# Note: the normal way we use in other scripts in Istio do not work when `source`d, which is why we use this approach
SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
REPO_ROOT="$(dirname "$(dirname "${SCRIPT_DIR}")")"

LOCAL_ARCH=$(uname -m)

# Pass environment set target architecture to build system
if [[ ${TARGET_ARCH} ]]; then
    # Target explicitly set
    :

  if [[ "${BUILD_ZTUNNEL_REPO:-}" == "" ]] && [[ "${BUILD_ZTUNNEL:-}" != "" ]]; then
    local ZTUNNEL_DIR
	ZTUNNEL_DIR="$(pwd)/../ztunnel"
    if [[ -d "${ZTUNNEL_DIR}" ]]; then
      BUILD_ZTUNNEL_REPO="${ZTUNNEL_DIR}"
    else
      echo "No directory at ${ZTUNNEL_DIR}"
      return
    fi
  fi
  if [[ "${BUILD_ZTUNNEL_REPO:-}" == "" ]]; then
    return
  fi

  if ! which cargo; then