Fix descend can not follow symlinks

1 files changed, 5 insertions, 1 deletions

diff --git a/src/buildstream/storage/_filebaseddirectory.py b/src/buildstream/storage/_filebaseddirectory.py
index 8c55819c9..a083f6507 100644
--- a/src/buildstream/storage/_filebaseddirectory.py
+++ b/src/buildstream/storage/_filebaseddirectory.py
@@ -37,6 +37,7 @@ from .. import utils
 from ..utils import link_files, copy_files, list_relative_paths, _get_link_mtime, BST_ARBITRARY_TIMESTAMP
 from ..utils import _set_deterministic_user, _set_deterministic_mtime
 from ..utils import FileListResult
+from .._exceptions import ImplError
 
 # FileBasedDirectory intentionally doesn't call its superclass constuctor,
 # which is meant to be unimplemented.
@@ -47,9 +48,12 @@ class FileBasedDirectory(Directory):
     def __init__(self, external_directory=None):
         self.external_directory = external_directory
 
-    def descend(self, *paths, create=False):
+    def descend(self, *paths, create=False, follow_symlinks=False):
         """ See superclass Directory for arguments """
 
+        if follow_symlinks:
+            ImplError("FileBasedDirectory.Decend dose not implement follow_symlinks=True")
+
         current_dir = self
 
         for path in paths: