[Distutils] distribute's sandboxing doesn't preserve working_set; leads to setup_requires problems

[P.J. Eby]

At 04:35 PM 5/19/2011 -0400, Erik Bray wrote:
>Just to confirm my theory about this, I modified 
>setuptools.sandbox.run_setup to also save off and restore 
>pkg_resources.working_set.{entries,entry_keys,by_key}.  This solves 
>the problem, and the build works regardless of how my setup_requires 
>are ordered.  Is there any reason this shouldn't be done?  It seems 
>reasonable to me... It would also still be nice to find a workaround 
>until and unless this gets patched.

That's necessary, but I don't think it's sufficient.  The changes I 
did to fix this in 2009 save other aspects of pkg_resources state 
besides just those, and I don't think it's something you can fix by 
monkeypatching.

(I could be wrong, of course, but given that setuptools was already 
been fixed, I'm not that motivated to investigate more deeply.)