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
}