removed panic, and replaced with error

Signed-off-by: EItanya <eitan.yarmush@solo.io>

cmd/helm/helm.go

@@ -65,7 +65,10 @@ func main() {
 	initKubeLogs()
 
 	actionConfig := new(action.Configuration)
-	cmd := newRootCmd(actionConfig, os.Stdout, os.Args[1:])
+	cmd, err := newRootCmd(actionConfig, os.Stdout, os.Args[1:])
+	if err != nil {
+		log.Fatal(err)
+	}
 
 	if err := actionConfig.Init(settings.RESTClientGetter(), settings.Namespace(), os.Getenv("HELM_DRIVER"), debug); err != nil {
 		log.Fatal(err)

cmd/helm/helm_test.go

@@ -107,7 +107,11 @@ func executeActionCommandC(store *storage.Storage, cmd string) (*cobra.Command,
 		Log:          func(format string, v ...interface{}) {},
 	}
 
-	root := newRootCmd(actionConfig, buf, args)
+	root, err := newRootCmd(actionConfig, buf, args)
+	if err != nil {
+		return nil, "", err
+	}
+
 	root.SetOutput(buf)
 	root.SetArgs(args)
 

cmd/helm/root.go

@@ -345,7 +345,7 @@ By default, the default directories depend on the Operating System. The defaults
 +------------------+---------------------------+--------------------------------+-------------------------+
 `
 
-func newRootCmd(actionConfig *action.Configuration, out io.Writer, args []string) *cobra.Command {
+func newRootCmd(actionConfig *action.Configuration, out io.Writer, args []string) (*cobra.Command, error) {
 	cmd := &cobra.Command{
 		Use:                    "helm",
 		Short:                  "The Helm package manager for Kubernetes.",
@@ -419,8 +419,7 @@ func newRootCmd(actionConfig *action.Configuration, out io.Writer, args []string
 		registry.ClientOptCredentialsFile(settings.RegistryConfig),
 	)
 	if err != nil {
-		// TODO: don't panic here, refactor newRootCmd to return error
-		panic(err)
+		return nil, err
 	}
 	actionConfig.RegistryClient = registryClient
 	cmd.AddCommand(
@@ -431,5 +430,5 @@ func newRootCmd(actionConfig *action.Configuration, out io.Writer, args []string
 	// Find and add plugins
 	loadPlugins(cmd, out)
 
-	return cmd
+	return cmd, nil
 }