diff -r 6cebeb1f386a -r ad0eeb0f7a8d hooks/metadata.py
--- a/hooks/metadata.py	Thu Sep 29 14:07:37 2011 +0200
+++ b/hooks/metadata.py	Thu Sep 29 14:47:04 2011 +0200
@@ -150,6 +150,8 @@
 # entity source handling #######################################################
 
 class ChangeEntityUpdateCaches(hook.Operation):
+    oldsource = newsource = entity = None # make pylint happy
+
     def postcommit_event(self):
         self.oldsource.reset_caches()
         repo = self.session.repo