Cleanup some "go vet" and "go lint" errors.

We should automate these checks...

cmd/minikube/cmd/config/config.go

@@ -43,7 +43,7 @@ type Setting struct {
 
 // These are all the settings that are configurable
 // and their validation and callback fn run on Set
-var settings []Setting = []Setting{
+var settings = []Setting{
 	{
 		name:        "vm-driver",
 		set:         SetString,
@@ -102,7 +102,7 @@ var ConfigCmd = &cobra.Command{
 	},
 }
 
-// Reads in the JSON minikube config
+// ReadConfig reads in the JSON minikube config
 func ReadConfig() (MinikubeConfig, error) {
 	f, err := os.Open(constants.ConfigFile)
 	if err != nil {
@@ -111,8 +111,7 @@ func ReadConfig() (MinikubeConfig, error) {
 		}
 		return nil, fmt.Errorf("Could not open file %s: %s", constants.ConfigFile, err)
 	}
-	var m MinikubeConfig
-	m, err = decode(f)
+	m, err := decode(f)
 	if err != nil {
 		return nil, fmt.Errorf("Could not decode config %s: %s", constants.ConfigFile, err)
 	}
@@ -120,7 +119,7 @@ func ReadConfig() (MinikubeConfig, error) {
 	return m, nil
 }
 
-// Writes a minikube config to the JSON file
+// WriteConfig writes a minikube config to the JSON file
 func WriteConfig(m MinikubeConfig) error {
 	f, err := os.Create(constants.ConfigFile)
 	if err != nil {

cmd/minikube/cmd/config/util.go

@@ -32,9 +32,8 @@ func run(name string, value string, fns []setFn) error {
 	}
 	if len(errors) > 0 {
 		return fmt.Errorf("%v", errors)
-	} else {
-		return nil
 	}
+	return nil
 }
 
 func findSetting(name string) (Setting, error) {

cmd/minikube/cmd/dashboard.go

@@ -48,7 +48,7 @@ var dashboardCmd = &cobra.Command{
 		service := "kubernetes-dashboard"
 
 		if err := commonutil.RetryAfter(20, func() error { return CheckService(namespace, service) }, 6*time.Second); err != nil {
-			fmt.Fprintln(os.Stderr, "Could not find finalized endpoint being pointed to by %s: %s", service, err)
+			fmt.Fprintf(os.Stderr, "Could not find finalized endpoint being pointed to by %s: %s\n", service, err)
 			os.Exit(1)
 		}
 

cmd/minikube/cmd/env.go

@@ -104,7 +104,7 @@ func shellCfgSet(api libmachine.API) (*ShellConfig, error) {
 
 		host, err := api.Load(constants.MachineName)
 		if err != nil {
-			return nil, fmt.Errorf("Error getting IP: ", err)
+			return nil, fmt.Errorf("Error getting IP: %s", err)
 		}
 
 		ip, err := host.Driver.GetIP()

cmd/minikube/cmd/service.go

@@ -55,7 +55,7 @@ var serviceCmd = &cobra.Command{
 
 		cluster.EnsureMinikubeRunningOrExit(api)
 		if err := commonutil.RetryAfter(20, func() error { return CheckService(namespace, service) }, 6*time.Second); err != nil {
-			fmt.Fprintln(os.Stderr, "Could not find finalized endpoint being pointed to by %s: %s", service, err)
+			fmt.Fprintf(os.Stderr, "Could not find finalized endpoint being pointed to by %s: %s\n", service, err)
 			os.Exit(1)
 		}
 

pkg/minikube/cluster/cluster_test.go

@@ -94,7 +94,7 @@ func TestStartCluster(t *testing.T) {
 
 	for _, cmd := range []string{stopCommand, GetStartCommand(kubernetesConfig)} {
 		if _, ok := h.Commands[cmd]; !ok {
-			t.Fatalf("Expected command not run: %s. Commands run: %s", cmd, h.Commands)
+			t.Fatalf("Expected command not run: %s. Commands run: %v", cmd, h.Commands)
 		}
 	}
 }
@@ -298,7 +298,7 @@ func TestDeleteHostMultipleErrors(t *testing.T) {
 	expectedErrors := []string{"Error removing " + constants.MachineName, "Error deleting machine"}
 	for _, expectedError := range expectedErrors {
 		if !strings.Contains(err.Error(), expectedError) {
-			t.Fatalf("Error %s expected to contain: %s. ", err)
+			t.Fatalf("Error %s expected to contain: %s.", err, expectedError)
 		}
 	}
 }
@@ -477,11 +477,11 @@ func TestGetDashboardURL(t *testing.T) {
 
 	port, err := getServicePortFromServiceGetter(mockServiceGetter, "kubernetes-dashboard")
 	if err != nil {
-		t.Fatalf("Error getting dashboard port from api: Error: ", err)
+		t.Fatalf("Error getting dashboard port from api: Error: %s", err)
 	}
 	expected := 1234
 	if port != expected {
-		t.Fatalf("Error getting dashboard port from api: Expected: %s, Got: %s", port, expected)
+		t.Fatalf("Error getting dashboard port from api: Expected: %d, Got: %d", port, expected)
 	}
 
 }

pkg/minikube/kubernetes_versions/kubernetes_versions_test.go

@@ -54,7 +54,7 @@ func TestGetK8sVersionsFromURLCorrect(t *testing.T) {
 	}
 	if len(k8sVersions) != 2 { // TODO(aprindle) change to len(handler....)
 		//Check values here as well?  Write eq method?
-		t.Fatalf("Expected two kubernetes versions from URL to be %s, it was instead %s", 2, len(k8sVersions))
+		t.Fatalf("Expected %d kubernetes versions from URL. Instead there were: %d", 2, len(k8sVersions))
 	}
 }
 
@@ -115,7 +115,7 @@ func TestPrintKubernetesVersions(t *testing.T) {
 
 	PrintKubernetesVersions(&outputBuffer, server.URL)
 	if len(outputBuffer.String()) == 0 {
-		t.Fatalf("Expected PrintKubernetesVersion to output text as %s versions were served from URL but output was [%s]",
+		t.Fatalf("Expected PrintKubernetesVersion to output text as %d versions were served from URL but output was [%s]",
 			2, outputBuffer.String()) //TODO(aprindle) change the 2
 	}
 }

pkg/minikube/notify/notify.go

@@ -113,7 +113,7 @@ func getLatestVersionFromURL(url string) (semver.Version, error) {
 func writeTimeToFile(path string, inputTime time.Time) error {
 	err := ioutil.WriteFile(path, []byte(inputTime.Format(timeLayout)), 0644)
 	if err != nil {
-		return fmt.Errorf("Error writing current update time to file: ", err)
+		return fmt.Errorf("Error writing current update time to file: %s", err)
 	}
 	return nil
 }

pkg/util/utils.go

@@ -52,7 +52,7 @@ func Until(fn func() error, w io.Writer, name string, sleep time.Duration, done
 }
 
 func Pad(str string) string {
-	return fmt.Sprint("\n%s\n", str)
+	return fmt.Sprintf("\n%s\n", str)
 }
 
 // If the file represented by path exists and