addons: Fail when enabling KVM addons on non-KVM cluster

pkg/addons/config.go

@@ -71,7 +71,7 @@ var Addons = []*Addon{
 	{
 		name:        "gvisor",
 		set:         SetBool,
-		validations: []setFn{IsRuntimeContainerd},
+		validations: []setFn{isRuntimeContainerd},
 		callbacks:   []setFn{EnableOrDisableAddon, verifyAddonStatus},
 	},
 	{
@@ -125,14 +125,16 @@ var Addons = []*Addon{
 		callbacks: []setFn{EnableOrDisableAddon, verifyAddonStatus},
 	},
 	{
-		name:      "nvidia-driver-installer",
-		set:       SetBool,
-		callbacks: []setFn{EnableOrDisableAddon},
+		name:        "nvidia-driver-installer",
+		set:         SetBool,
+		validations: []setFn{isKVMDriverForNVIDIA},
+		callbacks:   []setFn{EnableOrDisableAddon},
 	},
 	{
-		name:      "nvidia-gpu-device-plugin",
-		set:       SetBool,
-		callbacks: []setFn{EnableOrDisableAddon},
+		name:        "nvidia-gpu-device-plugin",
+		set:         SetBool,
+		validations: []setFn{isKVMDriverForNVIDIA},
+		callbacks:   []setFn{EnableOrDisableAddon},
 	},
 	{
 		name:      "olm",
@@ -204,7 +206,7 @@ var Addons = []*Addon{
 	{
 		name:        "csi-hostpath-driver",
 		set:         SetBool,
-		validations: []setFn{IsVolumesnapshotsEnabled},
+		validations: []setFn{isVolumesnapshotsEnabled},
 		callbacks:   []setFn{EnableOrDisableAddon, verifyAddonStatus},
 	},
 	{

pkg/addons/validations.go

@@ -24,6 +24,7 @@ import (
 	"k8s.io/minikube/pkg/minikube/assets"
 	"k8s.io/minikube/pkg/minikube/config"
 	"k8s.io/minikube/pkg/minikube/cruntime"
+	"k8s.io/minikube/pkg/minikube/driver"
 	"k8s.io/minikube/pkg/minikube/out"
 )
 
@@ -45,8 +46,7 @@ const volumesnapshotsDisabledMsg = `[WARNING] For full functionality, the 'csi-h
 You can enable 'volumesnapshots' addon by running: 'minikube addons enable volumesnapshots'
 `
 
-// IsRuntimeContainerd is a validator which returns an error if the current runtime is not containerd
-func IsRuntimeContainerd(cc *config.ClusterConfig, _, _ string) error {
+func isRuntimeContainerd(cc *config.ClusterConfig, _, _ string) error {
 	r, err := cruntime.New(cruntime.Config{Type: cc.KubernetesConfig.ContainerRuntime})
 	if err != nil {
 		return err
@@ -58,9 +58,9 @@ func IsRuntimeContainerd(cc *config.ClusterConfig, _, _ string) error {
 	return nil
 }
 
-// IsVolumesnapshotsEnabled is a validator that prints out a warning if the volumesnapshots addon
+// isVolumesnapshotsEnabled is a validator that prints out a warning if the volumesnapshots addon
 // is disabled (does not return any errors!)
-func IsVolumesnapshotsEnabled(cc *config.ClusterConfig, _, value string) error {
+func isVolumesnapshotsEnabled(cc *config.ClusterConfig, _, value string) error {
 	isCsiDriverEnabled, _ := strconv.ParseBool(value)
 	// assets.Addons[].IsEnabled() returns the current status of the addon or default value.
 	// config.AddonList contains list of addons to be enabled.
@@ -74,6 +74,15 @@ func IsVolumesnapshotsEnabled(cc *config.ClusterConfig, _, value string) error {
 	return nil
 }
 
+func isKVMDriverForNVIDIA(cc *config.ClusterConfig, name, _ string) error {
+	if driver.IsKVM(cc.Driver) {
+		return nil
+	}
+	out.Ln("")
+	out.FailureT("The {{.addon}} addon is only supported with the KVM driver.\n\nFor GPU setup instructions see: https://minikube.sigs.k8s.io/docs/tutorials/nvidia/", out.V{"addon": name})
+	return fmt.Errorf("%s addon is only supported with the KVM driver", name)
+}
+
 // isAddonValid returns the addon, true if it is valid
 // otherwise returns nil, false
 func isAddonValid(name string) (*Addon, bool) {

pkg/addons/validations_test.go

@@ -16,7 +16,11 @@ limitations under the License.
 
 package addons
 
-import "testing"
+import (
+	"testing"
+
+	"k8s.io/minikube/pkg/minikube/config"
+)
 
 func TestIsAddonValid(t *testing.T) {
 	tests := []struct {
@@ -76,3 +80,25 @@ func TestContains(t *testing.T) {
 		})
 	}
 }
+
+func TestIsKVMDriverForNVIDIA(t *testing.T) {
+	tests := []struct {
+		cc        *config.ClusterConfig
+		wantError bool
+	}{
+		{
+			cc: &config.ClusterConfig{Driver: "kvm"},
+		},
+		{
+			cc:        &config.ClusterConfig{Driver: "docker"},
+			wantError: true,
+		},
+	}
+
+	for _, tc := range tests {
+		err := isKVMDriverForNVIDIA(tc.cc, "", "")
+		if gotError := (err != nil); gotError != tc.wantError {
+			t.Errorf("isKVMDriverForNVIDIA(%v) got error %t (%v), want error %t", tc.cc, gotError, err, tc.wantError)
+		}
+	}
+}