diff -r 48fd1dfb99aa -r 7cc77030c557 mercurial/statichttprepo.py
--- a/mercurial/statichttprepo.py	Wed Jan 14 20:29:47 2015 -0800
+++ b/mercurial/statichttprepo.py	Thu Jan 15 23:17:12 2015 +0100
@@ -109,7 +109,7 @@
         self.names = namespaces.namespaces()
 
         try:
-            requirements = scmutil.readrequires(self.opener, self.supported)
+            requirements = scmutil.readrequires(self.vfs, self.supported)
         except IOError, inst:
             if inst.errno != errno.ENOENT:
                 raise
@@ -117,7 +117,7 @@
 
             # check if it is a non-empty old-style repository
             try:
-                fp = self.opener("00changelog.i")
+                fp = self.vfs("00changelog.i")
                 fp.read(1)
                 fp.close()
             except IOError, inst: