Fix DataDownload fails during restore for empty PVC workload

Signed-off-by: Ming Qiu <mqiu@vmware.com>

changelogs/unreleased/7521-qiuming-best

@@ -0,0 +1,2 @@
+Fix DataDownload fails during restore for empty PVC workload
+

pkg/uploader/kopia/snapshot.go

@@ -156,16 +156,6 @@ func Backup(ctx context.Context, fsUploader SnapshotUploader, repoWriter repo.Re
 		return nil, false, errors.Wrapf(err, "Invalid source path '%s'", sourcePath)
 	}
 
-	if volMode == uploader.PersistentVolumeFilesystem {
-		// to be consistent with restic when backup empty dir returns one error for upper logic handle
-		dirs, err := os.ReadDir(source)
-		if err != nil {
-			return nil, false, errors.Wrapf(err, "Unable to read dir in path %s", source)
-		} else if len(dirs) == 0 {
-			return nil, true, nil
-		}
-	}
-
 	source = filepath.Clean(source)
 
 	sourceInfo := snapshot.SourceInfo{

pkg/uploader/kopia/snapshot_test.go

@@ -610,7 +610,7 @@ func TestBackup(t *testing.T) {
 			name:          "Unable to read directory",
 			sourcePath:    "/invalid/path",
 			tags:          nil,
-			expectedError: errors.New("Unable to read dir"),
+			expectedError: errors.New("no such file or directory"),
 		},
 		{
 			name:          "Source path is not a block device",