https://blog.openshift.com/kubernetes-deep-dive-code-generation-customresources/
# 代码生成的工作目录，也就是我们的项目路径
$ ROOT_PACKAGE="k8s-dev/k8s-controller-custom-resource"
# API Group
$ CUSTOM_RESOURCE_NAME="mhc"
# API Version
$ CUSTOM_RESOURCE_VERSION="v1"
# 安装 k8s.io/code-generator
$ go get -u k8s.io/code-generator/...
$ cd $GOPATH/src/k8s.io/code-generator
# 执行代码自动生成，其中 pkg/client 是生成目标目录，pkg/apis 是类型定义目录
$ ./generate-groups.sh all "$ROOT_PACKAGE/pkg/client" "$ROOT_PACKAGE/pkg/apis" "$CUSTOM_RESOURCE_NAME:$CUSTOM_RESOURCE_VERSION"