[PATCH STABLE] windows: provide filename in IOError exceptions

[Steve Borho]

# HG changeset patch
# User Steve Borho <steve at borho.org>
# Date 1252976023 18000
# Node ID bc6b0fef9495b3944580a6bd26c7adecc87c3f88
# Parent  080227f584a140b2476d42346be9e9fd1c5649fe
windows: provide filename in IOError exceptions

This brings the Windows posixfile errors in line with the errors
on other platforms.

diff --git a/mercurial/windows.py b/mercurial/windows.py
--- a/mercurial/windows.py
+++ b/mercurial/windows.py
@@ -17,7 +17,7 @@
     try:
         return osutil.posixfile(name, mode, buffering)
     except WindowsError, err:
-        raise IOError(err.errno, err.strerror)
+        raise IOError(err.errno, '%s: %s' % (name, err.strerror))
 posixfile.__doc__ = osutil.posixfile.__doc__
 
 class winstdout(object):