changing string driver name to checked type

cmd/minikube/cmd/delete.go

@@ -56,7 +56,7 @@ associated files.`,
 		}
 
 		// In the case of "none", we want to uninstall Kubernetes as there is no VM to delete
-		if err == nil && cc.MachineConfig.VMDriver == "none" {
+		if err == nil && cc.MachineConfig.VMDriver == constants.DriverNone {
 			kc := cc.KubernetesConfig
 			bsName := viper.GetString(cmdcfg.Bootstrapper)
 			console.OutStyle(console.Resetting, "Uninstalling Kubernetes %s using %s ...", kc.KubernetesVersion, bsName)

cmd/minikube/cmd/env.go

@@ -35,6 +35,7 @@ import (
 	"github.com/spf13/cobra"
 	"k8s.io/minikube/pkg/minikube/cluster"
 	"k8s.io/minikube/pkg/minikube/config"
+	"k8s.io/minikube/pkg/minikube/constants"
 	"k8s.io/minikube/pkg/minikube/exit"
 	"k8s.io/minikube/pkg/minikube/machine"
 )
@@ -342,7 +343,7 @@ var dockerEnvCmd = &cobra.Command{
 		if err != nil {
 			exit.WithError("Error getting host", err)
 		}
-		if host.Driver.DriverName() == "none" {
+		if host.Driver.DriverName() == constants.DriverNone {
 			exit.Usage(`'none' driver does not support 'minikube docker-env' command`)
 		}
 		hostSt, err := cluster.GetHostStatus(api)

cmd/minikube/cmd/mount.go

@@ -102,7 +102,7 @@ var mountCmd = &cobra.Command{
 		if err != nil {
 			exit.WithError("Error loading api", err)
 		}
-		if host.Driver.DriverName() == "none" {
+		if host.Driver.DriverName() == constants.DriverNone {
 			exit.Usage(`'none' driver does not support 'minikube mount' command`)
 		}
 		var ip net.IP

cmd/minikube/cmd/ssh.go

@@ -23,6 +23,7 @@ import (
 	"k8s.io/minikube/pkg/minikube/cluster"
 	"k8s.io/minikube/pkg/minikube/config"
 	"k8s.io/minikube/pkg/minikube/console"
+	"k8s.io/minikube/pkg/minikube/constants"
 	"k8s.io/minikube/pkg/minikube/exit"
 	"k8s.io/minikube/pkg/minikube/machine"
 )
@@ -42,7 +43,7 @@ var sshCmd = &cobra.Command{
 		if err != nil {
 			exit.WithError("Error getting host", err)
 		}
-		if host.Driver.DriverName() == "none" {
+		if host.Driver.DriverName() == constants.DriverNone {
 			exit.Usage("'none' driver does not support 'minikube ssh' command")
 		}
 		err = cluster.CreateSSHShell(api, args)

pkg/drivers/none/none.go

@@ -27,10 +27,11 @@ import (
 	"k8s.io/apimachinery/pkg/util/net"
 	pkgdrivers "k8s.io/minikube/pkg/drivers" // TODO(tstromberg): Extract CommandRunner into its own package
 	"k8s.io/minikube/pkg/minikube/bootstrapper"
+	"k8s.io/minikube/pkg/minikube/constants"
 	"k8s.io/minikube/pkg/minikube/cruntime"
 )
 
-const driverName = "none"
+const driverName = constants.DriverNone
 
 // cleanupPaths are paths to be removed by cleanup, and are used by both kubeadm and minikube.
 var cleanupPaths = []string{

pkg/minikube/cluster/cluster.go

@@ -72,7 +72,7 @@ func init() {
 
 // CacheISO downloads and caches ISO.
 func CacheISO(config cfg.MachineConfig) error {
-	if config.VMDriver != "none" {
+	if config.MachineConfig.VMDriver == constants.DriverNone {
 		if err := config.Downloader.CacheMinikubeISOFromURL(config.MinikubeISO); err != nil {
 			return err
 		}
@@ -154,7 +154,7 @@ func configureHost(h *host.Host, e *engine.Options) error {
 		}
 	}
 
-	if h.Driver.DriverName() != "none" {
+	if h.Driver.DriverName() != constants.DriverNone {
 		if err := h.ConfigureAuth(); err != nil {
 			return &util.RetriableError{Err: errors.Wrap(err, "Error configuring auth on host")}
 		}

pkg/minikube/drivers/none/driver.go

@@ -28,7 +28,7 @@ import (
 
 func init() {
 	if err := registry.Register(registry.DriverDef{
-		Name:          "none",
+		Name:          constants.DriverNone,
 		Builtin:       true,
 		ConfigCreator: createNoneHost,
 		DriverCreator: func() drivers.Driver {

pkg/minikube/machine/client.go

@@ -189,7 +189,7 @@ func (api *LocalClient) Create(h *host.Host) error {
 		{
 			"waiting",
 			func() error {
-				if h.Driver.DriverName() == "none" {
+				if h.Driver.DriverName() == constants.DriverNone {
 					return nil
 				}
 				return mcnutils.WaitFor(drivers.MachineInState(h.Driver, state.Running))
@@ -198,7 +198,7 @@ func (api *LocalClient) Create(h *host.Host) error {
 		{
 			"provisioning",
 			func() error {
-				if h.Driver.DriverName() == "none" {
+				if h.Driver.DriverName() == constants.DriverNone {
 					return nil
 				}
 				pv := provision.NewBuildrootProvisioner(h.Driver)