Don't show usage on clone error

cmd/git-get/main.go

@@ -11,9 +11,10 @@ import (
 const ReposRoot = "/tmp/gitget"
 
 var cmd = &cobra.Command{
-	Use:     "git-get",
+	Use:     "git-get <repo>",
 	Short:   "git get",
-	RunE:    Run,
+	Run:     Run,
+	Args:    cobra.ExactArgs(1),
 	Version: "0.0.0",
 }
 
@@ -21,23 +22,22 @@ func init() {
 	//cmd.PersistentFlags().
 }
 
-func Run(cmd *cobra.Command, args []string) error {
+func Run(cmd *cobra.Command, args []string) {
 	url, err := pkg.ParseURL(args[0])
-	if err != nil {
-		return err
-	}
+	exitIfError(err)
 
 	_, err = pkg.CloneRepo(url, ReposRoot, false)
-	return err
+	exitIfError(err)
 }
 
-func Execute() {
-	if err := cmd.Execute(); err != nil {
+func main() {
+	err := cmd.Execute()
+	exitIfError(err)
+}
+
+func exitIfError(err error) {
+	if err != nil {
 		fmt.Println(err)
 		os.Exit(1)
 	}
 }
-
-func main() {
-	Execute()
-}