e2e: detect support for VolumeGroupSnapshot in librbd

Signed-off-by: Niels de Vos <ndevos@ibm.com>

e2e/rbd.go

@@ -4746,6 +4746,14 @@ var _ = Describe("RBD", func() {
 			})
 
 			By("test volumeGroupSnapshot", func() {
+				supported, err := librbdSupportsVolumeGroupSnapshot(f)
+				if err != nil {
+					framework.Failf("failed to check for VolumeGroupSnapshot support: %v", err)
+				}
+				if !supported {
+					Skip("librbd does not support required VolumeGroupSnapshot function(s)")
+				}
+
 				scName := "csi-rbd-sc"
 				snapshotter, err := newRBDVolumeGroupSnapshot(f, f.UniqueName, scName, false, deployTimeout, 3)
 				if err != nil {

e2e/rbd_helper.go

@@ -693,6 +693,28 @@ func validateEncryptedFilesystem(f *framework.Framework, rbdImageSpec, pvName, a
 	return nil
 }
 
+// librbdSupportsVolumeGroupSnapshot checks for the rbd_group_snap_get_info in
+// librbd.so.* in a ceph-csi container. If this function is available,
+// VolumeGroupSnapshot support is available.
+func librbdSupportsVolumeGroupSnapshot(f *framework.Framework) (bool, error) {
+	selector, err := getDaemonSetLabelSelector(f, cephCSINamespace, rbdDaemonsetName)
+	if err != nil {
+		return false, fmt.Errorf("failed to get labels: %w", err)
+	}
+	opt := metav1.ListOptions{
+		LabelSelector: selector,
+	}
+
+	// run a shell command (to expand the * in the filename), return 0 on stdout when successful
+	cmd := "sh -c 'grep -q rbd_group_snap_get_info /lib64/librbd.so.*; echo $?'"
+	stdout, _, err := execCommandInContainer(f, cmd, cephCSINamespace, "csi-rbdplugin", &opt)
+	if err != nil {
+		return false, fmt.Errorf("error checking for rbd_group_snap_get_info in /lib64/librbd.so.*: %w", err)
+	}
+
+	return strings.TrimSpace(stdout) == "0", nil
+}
+
 func listRBDImages(f *framework.Framework, pool string) ([]string, error) {
 	var imgInfos []string