[Distutils] why this version spec does not work?

[Jim Fulton]

On Tue, Aug 24, 2010 at 10:31 AM, Adam GROSZER <agroszer at gmail.com> wrote:
> Hello Jim,
>
> Monday, August 23, 2010, 8:48:16 PM, you wrote:
>
> JF> On Mon, Aug 23, 2010 at 12:46 PM, Adam GROSZER <agroszer at gmail.com> wrote:
>>> Hello,
>>>
>>> I have here this version spec in setup.py:
>>> 'zope.testing >=3.6.0,<3.10.0',
>>>
>>> but zc.buildout does not get it right.
>>> Source is here:
>>> svn://svn.zope.org/repos/main/zc.recipe.testrunner/branches/1.2.1
>>> Output is here:
>>> http://paste.lisp.org/+2FSQ
>>>
>>> Why on earth does zc.buildout pick zope.testing = 3.10.0 with the
>>> above spec??
>
> JF> If you look earlier in the output you provide a link to, buildout does
> JF> get it right.  It picks 3.9.5.
>
> JF> Then, when zc.recipe.testrunner runs, it tries to load zope.testing
> JF> explicitly:
>
> JF>   eggs, ws = self.egg.working_set(('zope.testing', ))
>
> JF> It doesn't restrict the version here.  This didn't cause a problem
> JF> until you added the restriction in in setup.py.
>
> JF> Anyone not interested in the implementation of zc.recipe.testrunner should
> JF> stop reading here, if you haven't already. :)
>
> JF> self.egg implies zc.recipe.testrunner, so the low-level buildout APIs
> JF> are asked to create a working set for zc.recipe.testrunner and
> JF> zope.testing.  It happens to load packages in a breadth first order
> JF> and gets the newest version of zope.testing before it tries to get the
> JF> restricted dependency of zc.recipe.testrunner.
>
> JF> The easiest way to fix this is to remove the redundant and now
> JF> incorrect reference to zope.testing in the call to
> JF> self.egg.working_set:
>
> JF>   eggs, ws = self.egg.working_set()
>
> Thanks for the pointer, but in my case it seems to work only with the
> version spec added:
>
> eggs, ws = self.egg.working_set(('zope.testing <3.10.0', ))
>
> If I do
>
> eggs, ws = self.egg.working_set()
>
> zope.testing seems to be missed from the test script entirely.

Ah, that makes sense when you're testing something other than
zc.recipe.testrunner itself.

Jim

-- 
Jim Fulton