[tahoe-dev] [tahoe-lafs] #1233: prefer binary eggs which satisfy dependencies over source eggs which are even newer

[tahoe-lafs]

#1233: prefer binary eggs which satisfy dependencies over source eggs which are
even newer
------------------------+---------------------------------------------------
 Reporter:  zooko       |           Owner:  somebody
     Type:  defect      |          Status:  new     
 Priority:  major       |       Milestone:  1.8.1   
Component:  packaging   |         Version:  1.8.0   
 Keywords:  setuptools  |   Launchpad Bug:          
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 Currently if the zetuptoolz-based build system finds both a binary egg
 (for the current platform that it is building on) and a source egg, and
 both of them satisfy the dependency requirement, it will choose the one
 with the highest version number.

 This is a serious problem in practice because, for example, if we have
 built and hosted dozens of binary eggs of zfec for many different
 combinations of platform and Python version, and then a newer source-code
 distribution of zfec is uploaded to PyPI, then the build system will no
 longer try to use any of those binary eggs and instead use the newer
 source distribution exclusively, which will fail on platforms that don't
 have a C compiler and Python header files present.

 To fix this, change the logic in zetuptoolz to prefer a binary egg,
 provided that it is for your platform and Python version and satisfies the
 dependency requirement, over a source distribution.

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Ticket URL: <http://tahoe-lafs.org/trac/tahoe-lafs/ticket/1233>
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