do not cache and re-use imm filenodes in nodemaker

[tahoe-lafs/tahoe-lafs.git] / src / allmydata / nodemaker.py

diff --git a/src/allmydata/nodemaker.py b/src/allmydata/nodemaker.py
index c820c71ca1732a8ced1d8397be55c6e5685c3b5d..d590bf5aea63a4fb0c3d817b07bd9486ccc01e30 100644 (file)
--- a/src/allmydata/nodemaker.py
+++ b/src/allmydata/nodemaker.py
@@ -72,12 +72,12 @@ class NodeMaker:
             cap = uri.from_string(bigcap, deep_immutable=deep_immutable,
                                   name=name)
             node = self._create_from_single_cap(cap)
-            if node:
-                self._node_cache[memokey] = node  # note: WeakValueDictionary
-            else:
+            if node is None:
                 # don't cache UnknownNode
                 node = UnknownNode(writecap, readcap,
                                    deep_immutable=deep_immutable, name=name)
+            elif node.is_mutable():
+                self._node_cache[memokey] = node  # note: WeakValueDictionary
 
         if self.blacklist:
             si = node.get_storage_index()