removed panic, and replaced with error

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

cmd/helm/helm.go

@@ -68,7 +68,10 @@ 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)
+	}
 
 	// run when each command's execute method is called
 	cobra.OnInitialize(func() {

cmd/helm/helm_test.go

@@ -115,9 +115,12 @@ func executeActionCommandStdinC(store *storage.Storage, in *os.File, cmd string)
 		Log:          func(format string, v ...interface{}) {},
 	}
 
-	root := newRootCmd(actionConfig, buf, args)
-	root.SetOut(buf)
-	root.SetErr(buf)
+	root, err := newRootCmd(actionConfig, buf, args)
+	if err != nil {
+		return nil, "", err
+	}
+
+	root.SetOutput(buf)
 	root.SetArgs(args)
 
 	oldStdin := os.Stdin

cmd/helm/root.go

@@ -68,7 +68,7 @@ By default, the default directories depend on the Operating System. The defaults
 | Windows          | %TEMP%\helm               | %APPDATA%\helm                 | %APPDATA%\helm          |
 `
 
-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.",
@@ -176,8 +176,7 @@ 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(
@@ -188,5 +187,5 @@ func newRootCmd(actionConfig *action.Configuration, out io.Writer, args []string
 	// Find and add plugins
 	loadPlugins(cmd, out)
 
-	return cmd
+	return cmd, nil
 }