e2e: add e2e test for RWX from ROX

added an e2e test case to create
RWX clone from ROX and also try
to write extra data in the RWX
cloned PVC.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

e2e/cephfs.go

@@ -2030,6 +2030,168 @@ var _ = Describe(cephfsType, func() {
 				}
 			})
 
+			By("create RWX clone from ROX PVC", func() {
+				pvc, err := loadPVC(pvcPath)
+				if err != nil {
+					framework.Failf("failed to load PVC: %v", err)
+				}
+				pvc.Namespace = f.UniqueName
+				err = createPVCAndvalidatePV(f.ClientSet, pvc, deployTimeout)
+				if err != nil {
+					framework.Failf("failed to create PVC: %v", err)
+				}
+
+				_, pv, err := getPVCAndPV(f.ClientSet, pvc.Name, pvc.Namespace)
+				if err != nil {
+					framework.Failf("failed to get PV object for %s: %v", pvc.Name, err)
+				}
+
+				app, err := loadApp(appPath)
+				if err != nil {
+					framework.Failf("failed to load application: %v", err)
+				}
+				app.Namespace = f.UniqueName
+				app.Spec.Volumes[0].PersistentVolumeClaim.ClaimName = pvc.Name
+				appLabels := map[string]string{
+					appKey: appLabel,
+				}
+				app.Labels = appLabels
+				optApp := metav1.ListOptions{
+					LabelSelector: fmt.Sprintf("%s=%s", appKey, appLabels[appKey]),
+				}
+				err = writeDataInPod(app, &optApp, f)
+				if err != nil {
+					framework.Failf("failed to write data: %v", err)
+				}
+
+				appTestFilePath := app.Spec.Containers[0].VolumeMounts[0].MountPath + "/test"
+
+				err = appendToFileInContainer(f, app, appTestFilePath, "hello", &optApp)
+				if err != nil {
+					framework.Failf("failed to append data: %v", err)
+				}
+
+				parentFileSum, err := calculateSHA512sum(f, app, appTestFilePath, &optApp)
+				if err != nil {
+					framework.Failf("failed to get SHA512 sum for file: %v", err)
+				}
+
+				snap := getSnapshot(snapshotPath)
+				snap.Namespace = f.UniqueName
+				snap.Spec.Source.PersistentVolumeClaimName = &pvc.Name
+				err = createSnapshot(&snap, deployTimeout)
+				if err != nil {
+					framework.Failf("failed to create snapshot: %v", err)
+				}
+				validateCephFSSnapshotCount(f, 1, subvolumegroup, pv)
+
+				pvcClone, err := loadPVC(pvcClonePath)
+				if err != nil {
+					framework.Failf("failed to load PVC: %v", err)
+				}
+				// Snapshot-backed volumes support read-only access modes only.
+				pvcClone.Spec.DataSource.Name = snap.Name
+				pvcClone.Spec.AccessModes = []v1.PersistentVolumeAccessMode{v1.ReadOnlyMany}
+
+				pvcClone.Namespace = f.UniqueName
+				err = createPVCAndvalidatePV(c, pvcClone, deployTimeout)
+				if err != nil {
+					framework.Failf("failed to create PVC: %v", err)
+				}
+
+				validateSubvolumeCount(f, 1, fileSystemName, subvolumegroup)
+
+				// create RWX clone from ROX PVC
+				pvcRWXClone, err := loadPVC(pvcSmartClonePath)
+				if err != nil {
+					framework.Failf("failed to load PVC: %v", err)
+				}
+				pvcRWXClone.Spec.DataSource.Name = pvcClone.Name
+				pvcRWXClone.Spec.AccessModes = []v1.PersistentVolumeAccessMode{v1.ReadWriteMany}
+				pvcRWXClone.Namespace = f.UniqueName
+
+				appClone, err := loadApp(appPath)
+				if err != nil {
+					framework.Failf("failed to load application: %v", err)
+				}
+				appCloneLabels := map[string]string{
+					appKey: appCloneLabel,
+				}
+				appClone.Name = f.UniqueName + "-app"
+				appClone.Namespace = f.UniqueName
+				appClone.Labels = appCloneLabels
+				appClone.Spec.Volumes[0].PersistentVolumeClaim.ClaimName = pvcRWXClone.Name
+				optAppClone := metav1.ListOptions{
+					LabelSelector: fmt.Sprintf("%s=%s", appKey, appCloneLabels[appKey]),
+				}
+
+				err = createPVCAndApp("", f, pvcRWXClone, appClone, deployTimeout)
+				if err != nil {
+					framework.Failf("failed to create PVC and app: %v", err)
+				}
+				// 2 subvolumes should be created 1 for parent PVC and 1 for
+				// RWX clone PVC.
+				validateSubvolumeCount(f, 2, fileSystemName, subvolumegroup)
+
+				appCloneTestFilePath := appClone.Spec.Containers[0].VolumeMounts[0].MountPath + "/test"
+
+				cloneFileSum, err := calculateSHA512sum(f, appClone, appCloneTestFilePath, &optAppClone)
+				if err != nil {
+					framework.Failf("failed to get SHA512 sum for file: %v", err)
+				}
+
+				if parentFileSum != cloneFileSum {
+					framework.Failf(
+						"SHA512 sums of files in parent and ROX should not differ. parentFileSum: %s cloneFileSum: %s",
+						parentFileSum,
+						cloneFileSum)
+				}
+
+				// Now try to write to the PVC as its a RWX PVC
+				err = appendToFileInContainer(f, app, appCloneTestFilePath, "testing", &optApp)
+				if err != nil {
+					framework.Failf("failed to append data: %v", err)
+				}
+
+				// Deleting snapshot before deleting pvcClone should succeed. It will be
+				// deleted once all volumes that are backed by this snapshot are gone.
+				err = deleteSnapshot(&snap, deployTimeout)
+				if err != nil {
+					framework.Failf("failed to delete snapshot: %v", err)
+				}
+				validateCephFSSnapshotCount(f, 0, subvolumegroup, pv)
+
+				// delete parent pvc and app
+				err = deletePVCAndApp("", f, pvc, app)
+				if err != nil {
+					framework.Failf("failed to delete PVC or application: %v", err)
+				}
+
+				// delete ROX clone PVC
+				err = deletePVCAndValidatePV(c, pvcClone, deployTimeout)
+				if err != nil {
+					framework.Failf("failed to delete PVC or application: %v", err)
+				}
+				// delete RWX clone PVC and app
+				err = deletePVCAndApp("", f, pvcRWXClone, appClone)
+				if err != nil {
+					framework.Failf("failed to delete PVC or application: %v", err)
+				}
+
+				validateSubvolumeCount(f, 0, fileSystemName, subvolumegroup)
+				validateOmapCount(f, 0, cephfsType, metadataPool, volumesType)
+
+				err = deleteResource(cephFSExamplePath + "storageclass.yaml")
+				if err != nil {
+					framework.Failf("failed to delete CephFS storageclass: %v", err)
+				}
+
+				err = createCephfsStorageClass(f.ClientSet, f, false, nil)
+				if err != nil {
+					framework.Failf("failed to create CephFS storageclass: %v", err)
+				}
+			})
+
 			if testCephFSFscrypt {
 				kmsToTest := map[string]kmsConfig{
 					"secrets-metadata-test": secretsMetadataKMS,