rbd: add generic ephemeral volume validation

This commit adds the validation of csi RBD driver to work with
ephemeral volume support. With ephemeral volume support a user can
specify ephemeral volumes in its pod spec and tie the lifecycle
of the PVC with the POD.

An example pod spec is also included in this commit.

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

e2e/rbd.go

@@ -57,6 +57,7 @@ var (
 	appClonePath           = rbdExamplePath + "pod-restore.yaml"
 	appSmartClonePath      = rbdExamplePath + "pod-clone.yaml"
 	appBlockSmartClonePath = rbdExamplePath + "block-pod-clone.yaml"
+	appEphemeralPath       = rbdExamplePath + "pod-ephemeral.yaml"
 	snapshotPath           = rbdExamplePath + "snapshot.yaml"
 	defaultCloneCount      = 10
 
@@ -367,6 +368,36 @@ var _ = Describe("RBD", func() {
 					}
 				})
 			}
+			By("verify generic ephemeral volume support", func() {
+				// generic ephemeral volume support is supported from 1.21
+				if !k8sVersionGreaterEquals(f.ClientSet, 1, 21) {
+					Skip("generic ephemeral volume only supported from v1.21+")
+				}
+				// create application
+				app, err := loadApp(appEphemeralPath)
+				if err != nil {
+					e2elog.Failf("failed to load application: %v", err)
+				}
+				app.Namespace = f.UniqueName
+				err = createApp(f.ClientSet, app, deployTimeout)
+				if err != nil {
+					e2elog.Failf("failed to create application: %v", err)
+				}
+				// validate created backend rbd images
+				validateRBDImageCount(f, 1, defaultRBDPool)
+				err = deletePod(app.Name, app.Namespace, f.ClientSet, deployTimeout)
+				if err != nil {
+					e2elog.Failf("failed to delete application: %v", err)
+				}
+				// validate created backend rbd images
+				validateRBDImageCount(f, 0, defaultRBDPool)
+				// validate images in trash
+				err = waitToRemoveImagesFromTrash(f, defaultRBDPool, deployTimeout)
+				if err != nil {
+					e2elog.Failf("failed to validate rbd images in pool %s trash: %v", defaultRBDPool, err)
+				}
+			})
+
 			// todo: may be remove the below deletion test later once the migration nodestage tests are adjusted
 			// also to have deletion validation through the same.
 			By("validate RBD migration+static Block PVC Deletion", func() {

examples/rbd/pod-ephemeral.yaml

@@ -0,0 +1,23 @@
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  name: csi-rbd-demo-ephemeral-pod
+spec:
+  containers:
+    - name: web-server
+      image: docker.io/library/nginx:latest
+      volumeMounts:
+        - mountPath: /myspace
+          name: mypvc
+  volumes:
+    - name: mypvc
+      ephemeral:
+        volumeClaimTemplate:
+          spec:
+            accessModes:
+              - ReadWriteOnce
+            storageClassName: csi-rbd-sc
+            resources:
+              requests:
+                storage: 1Gi