kubernetes/cmd/kubeadm/app/cmd/util/cmdutil.go

var ErrorSubcommandRequired …

// RequireSubcommand can be used to set an empty Run function and NoArgs on a Cobra command.
// This handles a case where a subcommand must be specified for a parent command 'c'.
// If no subcommand is specified the CLI exist with an error.
func RequireSubcommand(c *cobra.Command) { … }

// ValidateExactArgNumber validates that the required top-level arguments are specified
func ValidateExactArgNumber(args []string, supportedArgs []string) error { … }

// GetKubeConfigPath can be used to search for a kubeconfig in standard locations
// if and empty string is passed to the function. If a non-empty string is passed
// the function returns the same string.
func GetKubeConfigPath(file string) string { … }

// AddCRISocketFlag adds the cri-socket flag to the supplied flagSet
func AddCRISocketFlag(flagSet *pflag.FlagSet, criSocket *string) { … }

// InteractivelyConfirmAction asks the user whether they _really_ want to take the action.
func InteractivelyConfirmAction(action, question string, r io.Reader) error { … }

// ValueFromFlagsOrConfig checks if the "name" flag has been set. If yes, it returns the value of the flag, otherwise it returns the value from config.
func ValueFromFlagsOrConfig(flagSet *pflag.FlagSet, name string, cfgValue interface{ … }

// TypeMismatchErr return an error which indicates how the type is mismatched.
func TypeMismatchErr(opt, rType string) error { … }