diff -r 93f9d11603d8 -r b04cc8651a63 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Fri Nov 08 14:42:09 2013 +0900
+++ b/mercurial/localrepo.py	Mon Nov 11 22:59:26 2013 +0100
@@ -171,6 +171,7 @@
         self.opener = self.vfs
         self.baseui = baseui
         self.ui = baseui.copy()
+        self.ui.copy = baseui.copy # prevent copying repo configuration
         # A list of callback to shape the phase if no data were found.
         # Callback are in the form: func(repo, roots) --> processed root.
         # This list it to be filled by extension during repo setup