type ClusterRoleBindingOpts struct {//clusterrolebinding结构体
  CreateSubcommandOptions *CreateSubcommandOptions
}

//创建create clusterrolebinding命令
func NewCmdCreateClusterRoleBinding(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
  o := &ClusterRoleBindingOpts{//初始化结构体
    CreateSubcommandOptions: NewCreateSubcommandOptions(ioStreams),
  }

  cmd := &cobra.Command{//创建cobra命令
    Use:                   "clusterrolebinding NAME --clusterrole=NAME [--user=username] [--group=groupname] [--serviceaccount=namespace:serviceaccountname] [--dry-run]",
    DisableFlagsInUseLine: true,
    Short:                 i18n.T("Create a ClusterRoleBinding for a particular ClusterRole"),
    Long:                  clusterRoleBindingLong,
    Example:               clusterRoleBindingExample,
    Run: func(cmd *cobra.Command, args []string) {
      cmdutil.CheckErr(o.Complete(f, cmd, args))//准备运行
      cmdutil.CheckErr(o.Run())//运行
    },
  }

  o.CreateSubcommandOptions.PrintFlags.AddFlags(cmd)//设置print 选项

  cmdutil.AddApplyAnnotationFlags(cmd)//设置save-config选项
  cmdutil.AddValidateFlags(cmd)//设置validate选项
  cmdutil.AddGeneratorFlags(cmd, generateversioned.ClusterRoleBindingV1GeneratorName)//设置generator选项
  cmd.Flags().String("clusterrole", "", i18n.T("ClusterRole this ClusterRoleBinding should reference"))//设置clusterrole选项
  cmd.MarkFlagCustom("clusterrole", "__kubectl_get_resource_clusterrole")
  cmd.Flags().StringArray("user", []string{}, "Usernames to bind to the clusterrole")//设置user选项
  cmd.Flags().StringArray("group", []string{}, "Groups to bind to the clusterrole")//设置group选项
  cmd.Flags().StringArray("serviceaccount", []string{}, "Service accounts to bind to the clusterrole, in the format <namespace>:<name>")//设置serviceaccount选项
  return cmd
}

//准备运行
func (o *ClusterRoleBindingOpts) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
  name, err := NameFromCommandArgs(cmd, args)//获取名称
  if err != nil {
    return err
  }

  var generator generate.StructuredGenerator
  switch generatorName := cmdutil.GetFlagString(cmd, "generator"); generatorName {
  case generateversioned.ClusterRoleBindingV1GeneratorName://获取generator选项并判断
    generator = &generateversioned.ClusterRoleBindingGeneratorV1{//构造generator对象
      Name:            name,
      ClusterRole:     cmdutil.GetFlagString(cmd, "clusterrole"),
      Users:           cmdutil.GetFlagStringArray(cmd, "user"),
      Groups:          cmdutil.GetFlagStringArray(cmd, "group"),
      ServiceAccounts: cmdutil.GetFlagStringArray(cmd, "serviceaccount"),
    }
  default:
    return errUnsupportedGenerator(cmd, generatorName)
  }

  return o.CreateSubcommandOptions.Complete(f, cmd, args, generator)//运行createSubCommandOption complete方法
}