check resize mode on update events (#1194)

* check resize mode on update events

* add unit test for PVC resizing

* set resize mode to pvc in charts and manifests

* add test for quantityToGigabyte

* just one debug line for syncing volumes

* extend test and update log msg

pkg/cluster/cluster.go

@@ -140,7 +140,7 @@ func New(cfg Config, kubeClient k8sutil.KubernetesClient, pgSpec acidv1.Postgres
 			Secrets:   make(map[types.UID]*v1.Secret),
 			Services:  make(map[PostgresRole]*v1.Service),
 			Endpoints: make(map[PostgresRole]*v1.Endpoints)},
-		userSyncStrategy: users.DefaultUserSyncStrategy{password_encryption},
+		userSyncStrategy: users.DefaultUserSyncStrategy{PasswordEncryption: password_encryption},
 		deleteOptions:    metav1.DeleteOptions{PropagationPolicy: &deletePropagationPolicy},
 		podEventsQueue:   podEventsQueue,
 		KubeClient:       kubeClient,
@@ -671,13 +671,21 @@ func (c *Cluster) Update(oldSpec, newSpec *acidv1.Postgresql) error {
 
 	// Volume
 	if oldSpec.Spec.Size != newSpec.Spec.Size {
-		c.logger.Debugf("syncing persistent volumes")
 		c.logVolumeChanges(oldSpec.Spec.Volume, newSpec.Spec.Volume)
-
-		if err := c.syncVolumes(); err != nil {
-			c.logger.Errorf("could not sync persistent volumes: %v", err)
-			updateFailed = true
+		c.logger.Debugf("syncing volumes using %q storage resize mode", c.OpConfig.StorageResizeMode)
+		if c.OpConfig.StorageResizeMode == "pvc" {
+			if err := c.syncVolumeClaims(); err != nil {
+				c.logger.Errorf("could not sync persistent volume claims: %v", err)
+				updateFailed = true
+			}
+		} else if c.OpConfig.StorageResizeMode == "ebs" {
+			if err := c.syncVolumes(); err != nil {
+				c.logger.Errorf("could not sync persistent volumes: %v", err)
+				updateFailed = true
+			}
 		}
+	} else {
+		c.logger.Infof("Storage resize is disabled (storage_resize_mode is off). Skipping volume sync.")
 	}
 
 	// Statefulset