issue 8960: implement PodVolume exposer for PVB/PVR

Signed-off-by: Lyndon-Li <lyonghui@vmware.com>

pkg/cmd/cli/nodeagent/server.go

@@ -80,8 +80,6 @@ const (
 	// files will be written to
 	defaultCredentialsDirectory = "/tmp/credentials"
 
-	defaultHostPodsPath = "/host_pods"
-
 	defaultResourceTimeout         = 10 * time.Minute
 	defaultDataMoverPrepareTimeout = 30 * time.Minute
 	defaultDataPathConcurrentNum   = 1
@@ -416,10 +414,10 @@ func (s *nodeAgentServer) waitCacheForResume() error {
 // validatePodVolumesHostPath validates that the pod volumes path contains a
 // directory for each Pod running on this node
 func (s *nodeAgentServer) validatePodVolumesHostPath(client kubernetes.Interface) error {
-	files, err := s.fileSystem.ReadDir(defaultHostPodsPath)
+	files, err := s.fileSystem.ReadDir(nodeagent.HostPodVolumeMountPath())
 	if err != nil {
 		if errors.Is(err, os.ErrNotExist) {
-			s.logger.Warnf("Pod volumes host path [%s] doesn't exist, fs-backup is disabled", defaultHostPodsPath)
+			s.logger.Warnf("Pod volumes host path [%s] doesn't exist, fs-backup is disabled", nodeagent.HostPodVolumeMountPath())
 			return nil
 		}
 		return errors.Wrap(err, "could not read pod volumes host path")
@@ -452,7 +450,7 @@ func (s *nodeAgentServer) validatePodVolumesHostPath(client kubernetes.Interface
 			valid = false
 			s.logger.WithFields(logrus.Fields{
 				"pod":  fmt.Sprintf("%s/%s", pod.GetNamespace(), pod.GetName()),
-				"path": defaultHostPodsPath + "/" + dirName,
+				"path": nodeagent.HostPodVolumeMountPath() + "/" + dirName,
 			}).Debug("could not find volumes for pod in host path")
 		}
 	}

pkg/cmd/cli/nodeagent/server_test.go

@@ -99,7 +99,7 @@ func Test_validatePodVolumesHostPath(t *testing.T) {
 
 			for _, dir := range tt.dirs {
 				if tt.createDir {
-					err := fs.MkdirAll(filepath.Join(defaultHostPodsPath, dir), os.ModePerm)
+					err := fs.MkdirAll(filepath.Join(nodeagent.HostPodVolumeMountPath(), dir), os.ModePerm)
 					if err != nil {
 						t.Error(err)
 					}