--- a/mercurial/context.py	Mon Jul 12 19:04:07 2010 +0900
+++ b/mercurial/context.py	Fri Jul 09 11:59:48 2010 +0900
@@ -932,7 +932,7 @@
             return (t, tz)
 
     def cmp(self, text):
-        return self._repo.wread(self._path) == text
+        return self._repo.wread(self._path) != text
 
 class memctx(object):
     """Use memctx to perform in-memory commits via localrepo.commitctx().