[PATCH STABLE] win32mbcs: wrap underlying pycompat.bytestr to use checkwinfilename safely

[FUJIWARA Katsunori]

# HG changeset patch
# User FUJIWARA Katsunori <foozy at lares.dti.ne.jp>
# Date 1494593174 -32400
#      Fri May 12 21:46:14 2017 +0900
# Branch stable
# Node ID 71dc8e6d3207dd21de299b2e65c0976ca0b89e9c
# Parent  a0e46f6b248b7a6db0f3cd09b1dba6dcefeb8fd4
win32mbcs: wrap underlying pycompat.bytestr to use checkwinfilename safely

win32mbcs wraps some functions, to prevent them from unintentionally
treating backslash (0x5c), which is used as the second or later byte
of multi bytes characters by problematic encodings, as a path
component delimiter on Windows platform.

This wrapping assumes that wrapped functions can safely accept unicode
string arguments.

Unfortunately, d1937bdcee8c broke this assumption by introducing
pycompat.bytestr() into util.checkwinfilename() for py3 support. After
that, wrapped checkwinfilename() always fails for non-ASCII filename
at pycompat.bytestr() invocation.

This patch wraps underlying pycompat.bytestr() function to use
util.checkwinfilename() safely.

To avoid similar regression in the future, another patch series will
add smoke testing on default branch.

diff --git a/hgext/win32mbcs.py b/hgext/win32mbcs.py
--- a/hgext/win32mbcs.py
+++ b/hgext/win32mbcs.py
@@ -155,7 +155,8 @@ funcs = '''os.path.join os.path.split os
 # These functions are required to be called with local encoded string
 # because they expects argument is local encoded string and cause
 # problem with unicode string.
-rfuncs = '''mercurial.encoding.upper mercurial.encoding.lower'''
+rfuncs = '''mercurial.encoding.upper mercurial.encoding.lower
+ mercurial.pycompat.bytestr'''
 
 # List of Windows specific functions to be wrapped.
 winfuncs = '''os.path.splitunc'''