fix issue(11233)enhance kubectl config command

pkg/kubectl/cmd/config/config.go

@@ -17,6 +17,7 @@ limitations under the License.
 package config
 
 import (
+	"fmt"
 	"io"
 	"path"
 	"strconv"
@@ -81,3 +82,9 @@ func toBool(propertyValue string) (bool, error) {
 
 	return boolValue, nil
 }
+
+func helpErrorf(cmd *cobra.Command, format string, args ...interface{}) error {
+	cmd.Help()
+	msg := fmt.Sprintf(format, args...)
+	return fmt.Errorf("%s\n", msg)
+}

pkg/kubectl/cmd/config/create_cluster.go

@@ -150,8 +150,7 @@ func (o *createClusterOptions) modifyCluster(existingCluster clientcmdapi.Cluste
 func (o *createClusterOptions) complete(cmd *cobra.Command) error {
 	args := cmd.Flags().Args()
 	if len(args) != 1 {
-		cmd.Help()
-		return fmt.Errorf("Unexpected args: %v", args)
+		return helpErrorf(cmd, "Unexpected args: %v", args)
 	}
 
 	o.name = args[0]

pkg/kubectl/cmd/config/create_context.go

@@ -121,8 +121,7 @@ func (o *createContextOptions) modifyContext(existingContext clientcmdapi.Contex
 func (o *createContextOptions) complete(cmd *cobra.Command) error {
 	args := cmd.Flags().Args()
 	if len(args) != 1 {
-		cmd.Help()
-		return fmt.Errorf("Unexpected args: %v", args)
+		return helpErrorf(cmd, "Unexpected args: %v", args)
 	}
 
 	o.name = args[0]

pkg/kubectl/cmd/config/rename_context.go

@@ -83,8 +83,7 @@ func NewCmdConfigRenameContext(out io.Writer, configAccess clientcmd.ConfigAcces
 // Complete assigns RenameContextOptions from the args.
 func (o *RenameContextOptions) Complete(cmd *cobra.Command, args []string, out io.Writer) error {
 	if len(args) != 2 {
-		cmd.Help()
-		return fmt.Errorf("Unexpected args: %v", args)
+		return helpErrorf(cmd, "Unexpected args: %v", args)
 	}
 
 	o.contextName = args[0]

pkg/kubectl/cmd/config/set.go

@@ -106,8 +106,7 @@ func (o setOptions) run() error {
 func (o *setOptions) complete(cmd *cobra.Command) error {
 	endingArgs := cmd.Flags().Args()
 	if len(endingArgs) != 2 {
-		cmd.Help()
-		return fmt.Errorf("Unexpected args: %v", endingArgs)
+		return helpErrorf(cmd, "Unexpected args: %v", endingArgs)
 	}
 
 	o.propertyValue = endingArgs[1]

pkg/kubectl/cmd/config/unset.go

@@ -77,18 +77,13 @@ func (o unsetOptions) run() error {
 		return err
 	}
 
-	if err := clientcmd.ModifyConfig(o.configAccess, *config, false); err != nil {
-		return err
-	}
-
-	return nil
+	return clientcmd.ModifyConfig(o.configAccess, *config, false)
 }
 
 func (o *unsetOptions) complete(cmd *cobra.Command) error {
 	endingArgs := cmd.Flags().Args()
 	if len(endingArgs) != 1 {
-		cmd.Help()
-		return fmt.Errorf("Unexpected args: %v", endingArgs)
+		return helpErrorf(cmd, "Unexpected args: %v", endingArgs)
 	}
 
 	o.propertyName = endingArgs[0]

pkg/kubectl/cmd/config/use_context.go

@@ -47,6 +47,7 @@ func NewCmdConfigUseContext(out io.Writer, configAccess clientcmd.ConfigAccess)
 	cmd := &cobra.Command{
 		Use:     "use-context CONTEXT_NAME",
 		Short:   i18n.T("Sets the current-context in a kubeconfig file"),
+		Aliases: []string{"use"},
 		Long:    `Sets the current-context in a kubeconfig file`,
 		Example: use_context_example,
 		Run: func(cmd *cobra.Command, args []string) {
@@ -72,18 +73,13 @@ func (o useContextOptions) run() error {
 
 	config.CurrentContext = o.contextName
 
-	if err := clientcmd.ModifyConfig(o.configAccess, *config, true); err != nil {
-		return err
-	}
-
-	return nil
+	return clientcmd.ModifyConfig(o.configAccess, *config, true)
 }
 
 func (o *useContextOptions) complete(cmd *cobra.Command) error {
 	endingArgs := cmd.Flags().Args()
 	if len(endingArgs) != 1 {
-		cmd.Help()
-		return fmt.Errorf("Unexpected args: %v", endingArgs)
+		return helpErrorf(cmd, "Unexpected args: %v", endingArgs)
 	}
 
 	o.contextName = endingArgs[0]