diff -r 4034b8d551b1 -r 18242716a014 mercurial/ui.py
--- a/mercurial/ui.py	Mon Feb 11 16:15:12 2013 -0800
+++ b/mercurial/ui.py	Tue Feb 12 14:08:33 2013 -0800
@@ -739,7 +739,7 @@
         else:
             self.debug('%s:%s %s%s\n' % (topic, item, pos, unit))
 
-    def log(self, service, message):
+    def log(self, service, *msg, **opts):
         '''hook for logging facility extensions
 
         service should be a readily-identifiable subsystem, which will