Skip driver autodetection if driver is already set

cmd/minikube/cmd/start.go

@@ -299,9 +299,10 @@ func runStart(cmd *cobra.Command, args []string) {
 		exit.WithCodeT(exit.Data, "Unable to load config: {{.error}}", out.V{"error": err})
 	}
 
-	driverName := selectDriver(existing)
+	ds := selectDriver(existing)
+	driverName := ds.Name
 	glog.Infof("selected driver: %s", driverName)
-	validateDriver(driverName, existing)
+	validateDriver(ds, existing)
 	err = autoSetDriverOptions(cmd, driverName)
 	if err != nil {
 		glog.Errorf("Error autoSetOptions : %v", err)
@@ -567,53 +568,49 @@ func showKubectlInfo(kcs *kubeconfig.Settings, k8sVersion string, machineName st
 	return nil
 }
 
-func selectDriver(existing *config.MachineConfig) string {
-	name := viper.GetString("vm-driver")
-	glog.Infof("selectDriver: flag=%q, old=%v", name, existing)
-
+func selectDriver(existing *config.MachineConfig) registry.DriverState {
+	// Technically unrelated, but important to perform before detection
 	driver.SetLibvirtURI(viper.GetString(kvmQemuURI))
-	options := driver.Choices()
-	pick, alts := driver.Choose(name, options)
-	exp := ""
-	if pick.Priority == registry.Experimental {
-		exp = "experimental "
-	}
 
-	if name != "" {
-		out.T(out.Sparkle, `Selecting {{.experimental}}'{{.driver}}' driver from user configuration (alternates: {{.alternates}})`, out.V{"experimental": exp, "driver": name, "alternates": alts})
-		return name
+	if viper.GetString("vm-driver") != "" {
+		ds := driver.Status(viper.GetString("vm-driver"))
+		out.T(out.Sparkle, `Using the {{.driver}} driver based on user configuration`, out.V{"driver": ds.String()})
+		return ds
 	}
 
 	// By default, the driver is whatever we used last time
-	if existing != nil {
-		pick, alts := driver.Choose(existing.VMDriver, options)
-		if pick.Priority == registry.Experimental {
-			exp = "experimental "
-		}
-		out.T(out.Sparkle, `Selecting {{.experimental}}'{{.driver}}' driver from existing profile (alternates: {{.alternates}})`, out.V{"experimental": exp, "driver": existing.VMDriver, "alternates": alts})
-		return pick.Name
-	}
-
-	if len(options) > 1 {
-		out.T(out.Sparkle, `Automatically selected the {{.experimental}}'{{.driver}}' driver (alternates: {{.alternates}})`, out.V{"experimental": exp, "driver": pick.Name, "alternates": alts})
-	} else {
-		out.T(out.Sparkle, `Automatically selected the {{.experimental}}'{{.driver}}' driver`, out.V{"experimental": exp, "driver": pick.Name})
+	if existing != nil && existing.VMDriver != "" {
+		ds := driver.Status(existing.VMDriver)
+		out.T(out.Sparkle, `Using the {{.driver}} driver based on existing profile`, out.V{"driver": ds.String()})
+		return ds
 	}
 
+	pick, alts := driver.Suggest(driver.Choices())
 	if pick.Name == "" {
 		exit.WithCodeT(exit.Config, "Unable to determine a default driver to use. Try specifying --vm-driver, or see https://minikube.sigs.k8s.io/docs/start/")
 	}
-	return pick.Name
+
+	if len(alts) > 1 {
+		altNames := []string{}
+		for _, a := range alts {
+			altNames = append(altNames, a.String())
+		}
+		out.T(out.Sparkle, `Automatically selected the {{.driver}} driver. Other choices: {{.alternates}}`, out.V{"driver": pick.Name, "alternates": strings.Join(altNames, ", ")})
+	} else {
+		out.T(out.Sparkle, `Automatically selected the {{.driver}} driver`, out.V{"driver": pick.String()})
+	}
+	return pick
 }
 
 // validateDriver validates that the selected driver appears sane, exits if not
-func validateDriver(name string, existing *config.MachineConfig) {
+func validateDriver(ds registry.DriverState, existing *config.MachineConfig) {
+	name := ds.Name
 	glog.Infof("validating driver %q against %+v", name, existing)
 	if !driver.Supported(name) {
 		exit.WithCodeT(exit.Unavailable, "The driver {{.experimental}} '{{.driver}}' is not supported on {{.os}}", out.V{"driver": name, "os": runtime.GOOS})
 	}
 
-	st := driver.Status(name)
+	st := ds.State
 	glog.Infof("status for %s: %+v", name, st)
 
 	if st.Error != nil {

pkg/minikube/cluster/start.go

@@ -186,9 +186,9 @@ func commandRunner(h *host.Host) (command.Runner, error) {
 		return &command.FakeCommandRunner{}, nil
 	}
 
-  	if driver.BareMetal(h.Driver.DriverName()) {
+	if driver.BareMetal(h.Driver.DriverName()) {
 		glog.Infof("returning ExecRunner for %q driver", d)
-    		return command.NewExecRunner(), nil
+		return command.NewExecRunner(), nil
 	}
 	if driver.IsKIC(d) {
 		glog.Infof("Returning KICRunner for %q driver", d)

pkg/minikube/driver/driver.go

@@ -147,17 +147,10 @@ func Choices() []registry.DriverState {
 	return options
 }
 
-// Choose returns a suggested driver from a set of options
-func Choose(requested string, options []registry.DriverState) (registry.DriverState, []registry.DriverState) {
-	glog.Infof("requested: %q", requested)
+// Suggest returns a suggested driver from a set of options
+func Suggest(options []registry.DriverState) (registry.DriverState, []registry.DriverState) {
 	pick := registry.DriverState{}
 	for _, ds := range options {
-		if ds.Name == requested {
-			glog.Infof("choosing %q because it was requested", ds.Name)
-			pick = ds
-			continue
-		}
-
 		if !ds.State.Installed {
 			continue
 		}
@@ -192,8 +185,13 @@ func Choose(requested string, options []registry.DriverState) (registry.DriverSt
 }
 
 // Status returns the status of a driver
-func Status(name string) registry.State {
-	return registry.Status(name)
+func Status(name string) registry.DriverState {
+	d := registry.Driver(name)
+	return registry.DriverState{
+		Name:     d.Name,
+		Priority: d.Priority,
+		State:    registry.Status(name),
+	}
 }
 
 // SetLibvirtURI sets the URI to perform libvirt health checks against

pkg/minikube/driver/driver_test.go

@@ -80,14 +80,13 @@ func TestFlagDefaults(t *testing.T) {
 	}
 }
 
-func TestChoices(t *testing.T) {
+func TestSuggest(t *testing.T) {
 
 	tests := []struct {
-		def       registry.DriverDef
-		choices   []string
-		pick      string
-		alts      []string
-		requested string
+		def     registry.DriverDef
+		choices []string
+		pick    string
+		alts    []string
 	}{
 		{
 			def: registry.DriverDef{
@@ -129,12 +128,6 @@ func TestChoices(t *testing.T) {
 			pick:    "preferred",
 			alts:    []string{"default", "discouraged"},
 		},
-		{
-			requested: "unhealthy",
-			choices:   []string{"preferred", "default", "discouraged", "unhealthy"},
-			pick:      "unhealthy",
-			alts:      []string{"preferred", "default", "discouraged"},
-		},
 	}
 	for _, tc := range tests {
 		t.Run(tc.def.Name, func(t *testing.T) {
@@ -154,7 +147,7 @@ func TestChoices(t *testing.T) {
 				t.Errorf("choices mismatch (-want +got):\n%s", diff)
 			}
 
-			pick, alts := Choose(tc.requested, got)
+			pick, alts := Suggest(got)
 			if pick.Name != tc.pick {
 				t.Errorf("pick = %q, expected %q", pick.Name, tc.pick)
 			}

pkg/minikube/registry/global.go

@@ -17,6 +17,7 @@ limitations under the License.
 package registry
 
 import (
+	"fmt"
 	"os"
 	"sort"
 
@@ -36,6 +37,9 @@ type DriverState struct {
 }
 
 func (d DriverState) String() string {
+	if d.Priority == Experimental {
+		return fmt.Sprintf("%s (experimental)", d.Name)
+	}
 	return d.Name
 }