Minor improvements to output and comments

cmd/minikube/cmd/start.go

@@ -340,8 +340,8 @@ func runStart(cmd *cobra.Command, args []string) {
 	if !exists || config.VMDriver == constants.DriverNone {
 		fmt.Println("Starting cluster components...")
 		if err := k8sBootstrapper.StartCluster(kubernetesConfig); err != nil {
-			glog.Errorln("Error starting cluster: ", err)
-			cmdutil.MaybeReportErrorAndExit(fmt.Errorf("%s\nYou may be able to failure logs using: 'minikube logs'\n"))
+			glog.Errorf("Error starting cluster: %v", err)
+			cmdutil.MaybeReportErrorAndExit(err)
 		}
 	} else {
 		fmt.Println("Machine exists, restarting cluster components...")

cmd/util/util.go

@@ -130,6 +130,7 @@ func MaybeReportErrorAndExit(errToReport error) {
 	MaybeReportErrorAndExitWithCode(errToReport, 1)
 }
 
+// MaybeReportErrorAndExitWithCode prompts the user if they would like to report a stack trace, and exits.
 func MaybeReportErrorAndExitWithCode(errToReport error, returnCode int) {
 	var err error
 	if viper.GetBool(config.WantReportError) {
@@ -151,8 +152,10 @@ To disable this prompt, run: 'minikube config set WantReportErrorPrompt false'
 			fmt.Println("Bummer, perhaps next time!")
 		}
 	}
+
+	// This happens when the error was created without errors.Wrap(), and thus has no trace data.
 	if err != nil {
-		glog.Errorf(err.Error())
+		glog.Infof("report error failed: %v", err)
 	}
 	fmt.Printf("\n\nminikube failed :( exiting with error code %d\n", returnCode)
 	os.Exit(returnCode)

pkg/minikube/bootstrapper/kubeadm/kubeadm.go

@@ -170,7 +170,7 @@ func (k *KubeadmBootstrapper) StartCluster(k8s config.KubernetesConfig) error {
 
 	out, err := k.c.CombinedOutput(b.String())
 	if err != nil {
-		return errors.Wrapf(err, "kubeadm init failed: %s\n%s\n", b.String(), out)
+		return errors.Wrapf(err, "kubeadm init: %s\n%s\n", b.String(), out)
 	}
 
 	if version.LT(semver.MustParse("1.10.0-alpha.0")) {