py3: use pycompat.ossep at certain places

Certain instances of os.sep has been converted to pycompat.ossep where it was
sure to use bytes only. There are more such instances which needs some more
attention and will get surely.

mercurial/commands.py

@@ -61,6 +61,7 b' from . import ('
     phases,
     policy,
     pvec,
+    pycompat,
     repair,
     revlog,
     revset,
@@ -3160,7 +3161,7 b' def debugpathcomplete(ui, repo, *specs, '
         if os.path.isdir(spec):
             spec += '/'
         spec = spec[len(rootdir):]
-        fixpaths = os.sep != '/'
+        fixpaths = pycompat.ossep != '/'
         if fixpaths:
             spec = spec.replace(os.sep, '/')
         speclen = len(spec)
@@ -3755,7 +3756,7 b' def debugwalk(ui, repo, *pats, **opts):'
     if not items:
         return
     f = lambda fn: fn
-    if ui.configbool('ui', 'slash') and os.sep != '/':
+    if ui.configbool('ui', 'slash') and pycompat.ossep != '/':
         f = lambda fn: util.normpath(fn)
     fmt = 'f  %%-%ds  %%-%ds  %%s' % (
         max([len(abs) for abs in items]),

mercurial/dirstate.py

@@ -21,6 +21,7 b' from . import ('
     osutil,
     parsers,
     pathutil,
+    pycompat,
     scmutil,
     util,
 )
@@ -215,7 +216,7 b' class dirstate(object):'
 
     @propertycache
     def _slash(self):
-        return self._ui.configbool('ui', 'slash') and os.sep != '/'
+        return self._ui.configbool('ui', 'slash') and pycompat.ossep != '/'
 
     @propertycache
     def _checklink(self):

mercurial/pure/osutil.py

@@ -14,7 +14,11 b' import socket'
 import stat as statmod
 import sys
 
-from . import policy
+from . import (
+    policy,
+    pycompat,
+)
+
 modulepolicy = policy.policy
 policynocffi = policy.policynocffi
 
@@ -51,8 +55,8 b' def listdirpure(path, stat=False, skip=N'
     '''
     result = []
     prefix = path
-    if not prefix.endswith(os.sep):
-        prefix += os.sep
+    if not prefix.endswith(pycompat.ossep):
+        prefix += pycompat.ossep
     names = os.listdir(path)
     names.sort()
     for fn in names: