kubeconfigutil "k8s.io/kubernetes/cmd/kubeadm/app/util/kubeconfig"
)

// SubCmdRun returns a function that handles a case where a subcommand must be specified
// Without this callback, if a user runs just the command without a subcommand,
// or with an invalid subcommand, cobra will print usage information, but still exit cleanly.
func SubCmdRun() func(c *cobra.Command, args []string) {
	return func(c *cobra.Command, args []string) {

		printConfig:               false,
		out:                       out,
	}

	cmd := &cobra.Command{
		Use:   "upgrade",
		Short: "Upgrade your cluster smoothly to a newer version with this command",
		Run:   cmdutil.SubCmdRun(),
	}

	cmd.AddCommand(newCmdApply(flags))
	cmd.AddCommand(newCmdPlan(flags))
	cmd.AddCommand(newCmdDiff(out))
	cmd.AddCommand(newCmdNode(out))
	return cmd
}

		// cobra will print usage information, but still exit cleanly.
		// We want to return an error code in these cases so that the
		// user knows that their command was invalid.
		Run: cmdutil.SubCmdRun(),
	}

	options.AddKubeConfigFlag(cmd.PersistentFlags(), &kubeConfigFile)

	kubeConfigFile = cmdutil.GetKubeConfigPath(kubeConfigFile)
	cmd.AddCommand(newCmdConfigPrint(out))
	cmd.AddCommand(newCmdConfigMigrate(out))

func newCmdCertsUtility(out io.Writer) *cobra.Command {
	cmd := &cobra.Command{
		Use:     "certs",
		Aliases: []string{"certificates"},
		Short:   "Commands related to handling kubernetes certificates",
		Run:     cmdutil.SubCmdRun(),
	}

	cmd.AddCommand(newCmdCertsRenewal(out))
	cmd.AddCommand(newCmdCertsExpiration(out, kubeadmconstants.KubernetesDir))
	cmd.AddCommand(newCmdCertificateKey())
	cmd.AddCommand(newCmdGenCSR(out))

		// cobra will print usage information, but still exit cleanly.
		// We want to return an error code in these cases so that the
		// user knows that their command was invalid.
		Run: cmdutil.SubCmdRun(),
	}

	options.AddKubeConfigFlag(tokenCmd.PersistentFlags(), &kubeConfigFile)
	tokenCmd.PersistentFlags().BoolVar(&dryRun,
		options.DryRun, dryRun, "Whether to enable dry-run mode or not")