1 files changed, 26 insertions, 0 deletions
diff --git a/src/buildstream/storage/directory.py b/src/buildstream/storage/directory.py
index 55cc717f2..bb9d78f7e 100644
--- a/src/buildstream/storage/directory.py
+++ b/src/buildstream/storage/directory.py
@@ -196,6 +196,32 @@ class Directory:
         and effective space used may be lower than this number due to deduplication. """
         raise NotImplementedError()
 
+    def exists(self, *paths: str, follow_symlinks: bool = False) -> bool:
+        """ Check whether the specified path exists.
+
+        Args:
+          *paths: A list of strings which are all path components.
+          follow_symlinks: True to follow symlinks.
+
+        Returns:
+          True if the path exists, False otherwise.
+        """
+        raise NotImplementedError()
+
+    def open_file(self, *paths: str, mode: str = "r"):
+        """ Open file and return a corresponding file object. In text mode,
+        UTF-8 is used as encoding.
+
+        Args:
+          *paths: A list of strings which are all path components.
+          mode (str): An optional string that specifies the mode in which the file is opened.
+        """
+        raise NotImplementedError()
+
+    def _create_empty_file(self, *paths):
+        with self.open_file(*paths, mode="w"):
+            pass
+
 
 # FileType:
 #