text: #!/usr/bin/env bash
  
  # Copyright 2017 The Kubernetes Authors.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  set -o errexit
  set -o nounset
  set -o pipefail
  
  SCRIPT_ROOT=$(dirname "${BASH_SOURCE}")/..
  
  DIFFROOT="${SCRIPT_ROOT}/pkg"
  TMP_DIFFROOT="${SCRIPT_ROOT}/_tmp/pkg"
  _tmp="${SCRIPT_ROOT}/_tmp"
  
  cleanup() {
    rm -rf "${_tmp}"
  }
  trap "cleanup" EXIT SIGINT
  
  cleanup
  
  mkdir -p "${TMP_DIFFROOT}"
  cp -a "${DIFFROOT}"/* "${TMP_DIFFROOT}"
  
  "${SCRIPT_ROOT}/hack/update-codegen.sh"
  echo "diffing ${DIFFROOT} against freshly generated codegen"
  ret=0
  diff -Naupr "${DIFFROOT}" "${TMP_DIFFROOT}" || ret=$?
  cp -a "${TMP_DIFFROOT}"/* "${DIFFROOT}"
  if [[ $ret -eq 0 ]]
  then
    echo "${DIFFROOT} up to date."
  else
    echo "${DIFFROOT} is out of date. Please run hack/update-codegen.sh"
    exit 1
  fi
  