Automatically install docker-machine-driver-hyperkit if missing or incompatible

cmd/minikube/cmd/root.go

@@ -109,7 +109,7 @@ func Execute() {
 		flag.Usage = translate.T(flag.Usage)
 	})
 
-	if runtime.GOOS == "linux" {
+	if runtime.GOOS != "windows" {
 		// add minikube binaries to the path
 		targetDir := constants.MakeMiniPath("bin")
 		addToPath(targetDir)

cmd/minikube/cmd/start.go

@@ -289,7 +289,7 @@ func runStart(cmd *cobra.Command, args []string) {
 
 	validateConfig()
 	validateUser()
-	validateDriverVersion(driver)
+	installOrUpdateDriver(driver)
 
 	k8sVersion, isUpgrade := getKubernetesVersion()
 	config, err := generateCfgFromFlags(cmd, k8sVersion)
@@ -1028,62 +1028,27 @@ func saveConfig(clusterCfg *cfg.Config) error {
 	return cfg.CreateProfile(viper.GetString(cfg.MachineProfile), clusterCfg)
 }
 
-func validateDriverVersion(vmDriver string) {
+func installOrUpdateDriver(vmDriver string) {
 	var driverExecutable string
-	driverDocumentation := fmt.Sprintf("%s%s#driver-installation", constants.DriverDocumentation, vmDriver)
-
-	minikubeVersion, err := version.GetSemverVersion()
-	if err != nil {
-		out.WarningT("Error parsing minukube version: {{.error}}", out.V{"error": err})
-		return
-	}
-
 	switch vmDriver {
 	case constants.DriverKvm2:
 		driverExecutable = fmt.Sprintf("docker-machine-driver-%s", constants.DriverKvm2)
-		targetDir := constants.MakeMiniPath("bin")
-		err := drivers.InstallOrUpdate(driverExecutable, targetDir, minikubeVersion)
-		if err != nil {
-			out.WarningT("Error downloading driver: {{.error}}", out.V{"error": err})
-		}
-		return
 	case constants.DriverHyperkit:
 		driverExecutable = fmt.Sprintf("docker-machine-driver-%s", constants.DriverHyperkit)
-	default: // driver doesn't support version
+	default: // driver doesn't installOrUpdate
 		return
 	}
 
-	cmd := exec.Command(driverExecutable, "version")
-	output, err := cmd.Output()
-
-	// we don't want to fail if an error was returned,
-	// libmachine has a nice message for the user if the driver isn't present
+	minikubeVersion, err := version.GetSemverVersion()
 	if err != nil {
-		out.WarningT("Error checking driver version: {{.error}}", out.V{"error": err})
+		out.WarningT("Error parsing minukube version: {{.error}}", out.V{"error": err})
 		return
 	}
 
-	v := drivers.ExtractVMDriverVersion(string(output))
-
-	// if the driver doesn't have return any version, it is really old, we force a upgrade.
-	if len(v) == 0 && !viper.GetBool(force) {
-		exit.WithCodeT(
-			exit.Failure,
-			"The installed version of '{{.driver_executable}}' is obsolete. Upgrade: {{.documentation_url}}",
-			out.V{"driver_executable": driverExecutable, "documentation_url": driverDocumentation},
-		)
-	}
-
-	vmDriverVersion, err := semver.Make(v)
+	targetDir := constants.MakeMiniPath("bin")
+	err = drivers.InstallOrUpdate(driverExecutable, targetDir, minikubeVersion)
 	if err != nil {
-		out.WarningT("Error parsing vmDriver version: {{.error}}", out.V{"error": err})
-		return
-	}
-
-	if vmDriverVersion.LT(minikubeVersion) {
-		out.WarningT(
-			"The installed version of '{{.driver_executable}}' ({{.driver_version}}) is no longer current. Upgrade: {{.documentation_url}}",
-			out.V{"driver_executable": driverExecutable, "driver_version": vmDriverVersion, "documentation_url": driverDocumentation},
-		)
+		out.WarningT("Error downloading driver: {{.error}}", out.V{"error": err})
 	}
+	return
 }

pkg/drivers/drivers.go

@@ -17,6 +17,7 @@ limitations under the License.
 package drivers
 
 import (
+	"fmt"
 	"io"
 	"io/ioutil"
 	"os"
@@ -42,7 +43,8 @@ import (
 )
 
 const (
-	driverKVMDownloadURL = "https://storage.googleapis.com/minikube/releases/latest/docker-machine-driver-kvm2"
+	driverKVMDownloadURL      = "https://storage.googleapis.com/minikube/releases/latest/docker-machine-driver-kvm2"
+	driverHyperKitDownloadURL = "https://storage.googleapis.com/minikube/releases/latest/docker-machine-driver-hyperkit"
 )
 
 // GetDiskPath returns the path of the machine disk image
@@ -187,17 +189,23 @@ func InstallOrUpdate(driver, destination string, minikubeVersion semver.Version)
 }
 
 func download(driver, destination string) error {
-	// only support kvm2 for now
-	if driver != "docker-machine-driver-kvm2" {
+	// supports kvm2 and hyperkit
+	if driver != "docker-machine-driver-kvm2" && driver != "docker-machine-driver-hyperkit" {
 		return nil
 	}
 
 	out.T(out.Happy, "Downloading driver {{.driver}}:", out.V{"driver": driver})
 
-	targetFilepath := path.Join(destination, "docker-machine-driver-kvm2")
+	targetFilepath := path.Join(destination, driver)
 	os.Remove(targetFilepath)
 
-	url := driverKVMDownloadURL
+	var url string
+	switch driver {
+	case "docker-machine-driver-kvm2":
+		url = driverKVMDownloadURL
+	case "docker-machine-driver-hyperkit":
+		url = driverHyperKitDownloadURL
+	}
 
 	opts := []getter.ClientOption{getter.WithProgress(util.DefaultProgressBar)}
 	client := &getter.Client{
@@ -216,6 +224,13 @@ func download(driver, destination string) error {
 		return errors.Wrap(err, "chmod error")
 	}
 
+	if driver == "docker-machine-driver-hyperkit" {
+		err := setHyperKitPermissions(targetFilepath)
+		if err != nil {
+			return errors.Wrap(err, "setting hyperkit permission")
+		}
+	}
+
 	return nil
 }
 
@@ -235,3 +250,22 @@ func ExtractVMDriverVersion(s string) string {
 	v := strings.TrimSpace(matches[1])
 	return strings.TrimPrefix(v, version.VersionPrefix)
 }
+
+func setHyperKitPermissions(driverPath string) error {
+	msg := fmt.Sprintf("A new hyperkit driver was installed. It needs elevated permissions to run. The following commands will be executed\nsudo chown root:wheel %s\nsudo chmod u+s %s", driverPath, driverPath)
+	out.T(out.Happy, msg, out.V{})
+
+	cmd := exec.Command("sudo", "chown", "root:wheel", driverPath)
+	err := cmd.Run()
+	if err != nil {
+		return errors.Wrap(err, "chown root:wheel")
+	}
+
+	cmd = exec.Command("sudo", "chmod", "u+s", driverPath)
+	err = cmd.Run()
+	if err != nil {
+		return errors.Wrap(err, "chmod u+s")
+	}
+
+	return nil
+}

pkg/minikube/constants/constants.go

@@ -374,8 +374,3 @@ const (
 	// GvisorURL is the url to download gvisor
 	GvisorURL = "https://storage.googleapis.com/gvisor/releases/nightly/2019-01-14/runsc"
 )
-
-const (
-	// DriverDocumentation the documentation of the KVM driver
-	DriverDocumentation = "https://minikube.sigs.k8s.io/docs/reference/drivers/"
-)