1 files changed, 9 insertions, 0 deletions
diff --git a/src/buildstream/storage/_casbaseddirectory.py b/src/buildstream/storage/_casbaseddirectory.py
index a42a9f87c..51d9909fd 100644
--- a/src/buildstream/storage/_casbaseddirectory.py
+++ b/src/buildstream/storage/_casbaseddirectory.py
@@ -813,6 +813,15 @@ class CasBasedDirectory(Directory):
         except VirtualDirectoryError:
             return False
 
+    def _set_subtree_read_only(self, read_only):
+        self.__node_properties = list(filter(lambda prop: prop.name != "SubtreeReadOnly", self.__node_properties))
+        node_property = remote_execution_pb2.NodeProperty()
+        node_property.name = "SubtreeReadOnly"
+        node_property.value = "true" if read_only else "false"
+        self.__node_properties.append(node_property)
+
+        self.__invalidate_digest()
+
     def __invalidate_digest(self):
         if self.__digest:
             self.__digest = None