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.
#require execbit
$ hg init repo
$ cd repo
$ echo foo > foo
$ chmod 644 foo
$ hg ci -qAm '644'
$ chmod 755 foo
$ hg ci -qAm '755'
reverting to rev 0
$ hg revert -a -r 0
reverting foo
$ hg st
M foo
$ hg diff --git
diff --git a/foo b/foo
old mode 100755
new mode 100644
$ cd ..