addons: mark the last enabled storage provider as default

When a storage provider is enabled (storage-provisioner-glusterfile),
mark it "is-default" and set "is-default" to "false" in all other
StorageClasses.

cmd/minikube/cmd/config/config.go

@@ -144,7 +144,7 @@ var settings = []Setting{
 		name:        "default-storageclass",
 		set:         SetBool,
 		validations: []setFn{IsValidAddon},
-		callbacks:   []setFn{EnableOrDisableAddon},
+		callbacks:   []setFn{EnableOrDisableStorageClasses},
 	},
 	{
 		name:        "heapster",
@@ -186,7 +186,7 @@ var settings = []Setting{
 		name:        "default-storageclass",
 		set:         SetBool,
 		validations: []setFn{IsValidAddon},
-		callbacks:   []setFn{EnableOrDisableDefaultStorageClass},
+		callbacks:   []setFn{EnableOrDisableStorageClasses},
 	},
 	{
 		name:        "storage-provisioner",

cmd/minikube/cmd/config/util.go

@@ -26,6 +26,7 @@ import (
 	"k8s.io/minikube/pkg/minikube/assets"
 	"k8s.io/minikube/pkg/minikube/cluster"
 	"k8s.io/minikube/pkg/minikube/config"
+	"k8s.io/minikube/pkg/minikube/constants"
 	"k8s.io/minikube/pkg/minikube/machine"
 	"k8s.io/minikube/pkg/minikube/storageclass"
 )
@@ -138,38 +139,28 @@ func EnableOrDisableAddon(name string, val string) error {
 	return nil
 }
 
-func EnableOrDisableDefaultStorageClass(name, val string) error {
+func EnableOrDisableStorageClasses(name, val string) error {
 	enable, err := strconv.ParseBool(val)
 	if err != nil {
 		return errors.Wrap(err, "Error parsing boolean")
 	}
 
-	// Special logic to disable the default storage class
-	if !enable {
-		err := storageclass.DisableDefaultStorageClass()
-		if err != nil {
-			return errors.Wrap(err, "Error disabling default storage class")
-		}
-	}
-	return EnableOrDisableAddon(name, val)
-}
-
-func EnableOrDisableStorageClasses(name, val string) error {
-	enable, err := strconv.ParseBool(val)
-	if err != nil {
-		return errors.Wrap(err, "Error parsing boolean")
+	class := constants.DefaultStorageClassProvisioner
+	if name == "storage-provisioner-gluster" {
+		class = "glusterfile"
 	}
 
-	// Only StorageClass for 'name' should stay enabled
 	if enable {
-		class := "standard"
-		if name == "storage-provisioner-gluster" {
-			class = "glusterfile"
+		// Only StorageClass for 'name' should be marked as default
+		err := storageclass.SetDefaultStorageClass(class)
+		if err != nil {
+			return errors.Wrapf(err, "Error making %s the default storage class", class)
 		}
-
-		err := storageclass.DisableAllOtherStorageClasses(class)
+	} else {
+		// Unset the StorageClass as default
+		err := storageclass.DisableDefaultStorageClass(class)
 		if err != nil {
-			return errors.Wrap(err, "Error disabling storage classes")
+			return errors.Wrapf(err, "Error disabling %s as the default storage class", class)
 		}
 	}
 

deploy/addons/storage-provisioner-gluster/storage-provisioner-glusterfile.yaml

@@ -6,7 +6,7 @@ metadata:
   labels:
     k8s-app: storage-provisioner-gluster
     kubernetes.io/minikube-addons: storage-provisioner-gluster
-    addonmanager.kubernetes.io/mode: Reconcile
+    addonmanager.kubernetes.io/mode: EnsureExists
   annotations:
     storageclass.beta.kubernetes.io/is-default-class: "true"
 provisioner: gluster.org/glusterfile

pkg/minikube/storageclass/storageclass.go

@@ -17,17 +17,28 @@ limitations under the License.
 package storageclass
 
 import (
+	"strconv"
+
 	"github.com/pkg/errors"
+	"k8s.io/api/storage/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/kubernetes"
 
 	"k8s.io/client-go/tools/clientcmd"
-	"k8s.io/minikube/pkg/minikube/constants"
 )
 
+func annotateDefaultStorageClass(client *kubernetes.Clientset, class *v1.StorageClass, enable bool) error {
+	isDefault := strconv.FormatBool(enable)
+
+	metav1.SetMetaDataAnnotation(&class.ObjectMeta, "storageclass.beta.kubernetes.io/is-default-class", isDefault)
+	_, err := client.Storage().StorageClasses().Update(class)
+
+	return err
+}
+
 // DisableDefaultStorageClass disables the default storage class provisioner
 // The addon-manager and kubectl apply cannot delete storageclasses
-func DisableDefaultStorageClass() error {
+func DisableDefaultStorageClass(class string) error {
 	loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
 	kubeConfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, &clientcmd.ConfigOverrides{})
 	config, err := kubeConfig.ClientConfig()
@@ -39,15 +50,22 @@ func DisableDefaultStorageClass() error {
 		return errors.Wrap(err, "Error creating new client from kubeConfig.ClientConfig()")
 	}
 
-	err = client.Storage().StorageClasses().Delete(constants.DefaultStorageClassProvisioner, &metav1.DeleteOptions{})
+	sc, err := client.Storage().StorageClasses().Get(class, metav1.GetOptions{})
 	if err != nil {
-		return errors.Wrapf(err, "Error deleting default storage class %s", constants.DefaultStorageClassProvisioner)
+		return errors.Wrapf(err, "Error getting storage class %s", class)
+	}
+
+	err = annotateDefaultStorageClass(client, sc, false)
+	if err != nil {
+		return errors.Wrapf(err, "Error marking storage class %s as non-default", class)
 	}
 
 	return nil
 }
 
-func DisableAllOtherStorageClasses(name string) error {
+// SetDefaultStorageClass makes sure onlt the class with @name is marked as
+// default.
+func SetDefaultStorageClass(name string) error {
 	loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
 	kubeConfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, &clientcmd.ConfigOverrides{})
 	config, err := kubeConfig.ClientConfig()
@@ -65,13 +83,13 @@ func DisableAllOtherStorageClasses(name string) error {
 	}
 
 	for _, sc := range scList.Items {
-		if sc.Name == name {
-			continue
-		}
-
-		err = client.Storage().StorageClasses().Delete(sc.Name, &metav1.DeleteOptions{})
+		err = annotateDefaultStorageClass(client, &sc, sc.Name == name)
 		if err != nil {
-			return errors.Wrapf(err, "Error deleting storage class %s", sc.Name)
+			isDefault := "non-default"
+			if sc.Name == name {
+				isDefault = "default"
+			}
+			return errors.Wrapf(err, "Error while marking storage class %s as %s", sc.Name, isDefault)
 		}
 	}