[Distutils] easy_install doesn't recognize valid distutils Windows installers

[Matt Good]

On Windows "easy_install trac" fails with the error:
"trac-0.10b1.win32.exe is not a valid distutils Windows .exe"

http://trac.edgewall.org/ticket/3750

The problem is with easy_install locating the config information
embedded in the file.  The following patch works with the Trac
installer, but I don't know if it will break support for other
installers:

Index: setuptools/command/easy_install.py
===================================================================
--- setuptools/command/easy_install.py  (revision 51920)
+++ setuptools/command/easy_install.py  (working copy)
@@ -1249,7 +1249,7 @@
         if tag not in (0x1234567A, 0x1234567B):
             return None     # not a valid tag

-        f.seek(prepended-(12+cfglen+bmlen))
+        f.seek(prepended-(12+cfglen))
         cfg =
ConfigParser.RawConfigParser({'version':'','target_version':''})
         try:

cfg.readfp(StringIO.StringIO(f.read(cfglen).split(chr(0),1)[0]))


-- 
Matt Good <matt at matt-good.net>