diff -r a8b17859684a -r 20a42325fdef mercurial/debugcommands.py
--- a/mercurial/debugcommands.py	Wed Aug 17 20:57:15 2016 -0700
+++ b/mercurial/debugcommands.py	Wed Nov 23 00:03:11 2016 +0530
@@ -8,7 +8,6 @@
 from __future__ import absolute_import
 
 import operator
-import os
 import random
 
 from .i18n import _
@@ -30,6 +29,7 @@
     hg,
     localrepo,
     lock as lockmod,
+    pycompat,
     revlog,
     scmutil,
     setdiscovery,
@@ -50,7 +50,7 @@
     """find the ancestor revision of two revisions in a given index"""
     if len(args) == 3:
         index, rev1, rev2 = args
-        r = revlog.revlog(scmutil.opener(os.getcwd(), audit=False), index)
+        r = revlog.revlog(scmutil.opener(pycompat.getcwd(), audit=False), index)
         lookup = r.lookup
     elif len(args) == 2:
         if not repo:
@@ -385,7 +385,8 @@
     spaces = opts.get('spaces')
     dots = opts.get('dots')
     if file_:
-        rlog = revlog.revlog(scmutil.opener(os.getcwd(), audit=False), file_)
+        rlog = revlog.revlog(scmutil.opener(pycompat.getcwd(), audit=False),
+                             file_)
         revs = set((int(r) for r in revs))
         def events():
             for r in rlog: