diff -r 8321b083a83d -r 3874ddba1ab4 mercurial/pycompat.py
--- a/mercurial/pycompat.py	Sun Nov 06 12:18:23 2016 +0900
+++ b/mercurial/pycompat.py	Sun Nov 06 03:33:22 2016 +0530
@@ -10,6 +10,7 @@
 
 from __future__ import absolute_import
 
+import os
 import sys
 
 ispy3 = (sys.version_info[0] >= 3)
@@ -34,9 +35,10 @@
 if ispy3:
     import builtins
     import functools
-    import os
     fsencode = os.fsencode
     fsdecode = os.fsdecode
+    # A bytes version of os.name.
+    osname = os.name.encode('ascii')
 
     def sysstr(s):
         """Return a keyword str to be passed to Python functions such as
@@ -82,6 +84,8 @@
     def fsdecode(filename):
         return filename
 
+    osname = os.name
+
 stringio = io.StringIO
 empty = _queue.Empty
 queue = _queue.Queue