[Distutils] Building an egg from Subversion using zc.buildout
jim at zope.com
Sat Feb 10 18:54:54 CET 2007
On Feb 9, 2007, at 6:49 PM, Phillip J. Eby wrote:
> At 05:26 PM 2/9/2007 -0500, Jim Fulton wrote:
>> > ValueError: ("Couldn't find", Requirement.parse
>> > ('archetypes.kss==dev'))
>> I finally found some time to look into this.
>> Buildout uses setuptools APIs. It uses a PackageIndex to download
>> the distribution and this actually works. It then uses an
>> environment best_match method to get a distribution object and
>> best_match returns None. If I remove the ==dev from the requirement,
>> then best_match is able to find the distribution. This happens
>> because apparently no distributions match a requirement for the "dev"
>> version. Should I view this as a bug in setuptools?
> The normal usage is "==dev,>=realver" where 'realver' is the real
> version you want.
Is using just ==dev is correct usage? It works with easy_install.
I think the user's desire is to get the most recent version. It's
not clear to me that they'd know what other revision to specify.
>> Or does buildout
>> need to special case the version "dev"?
> I don't think so.
If ==dev is considered valid and if the environment best_match method
isn't going to consider it a match against installed distributions,
then I'll need to special case it or use some other API. People
using buildout are generally going to expect things that work with
easy_install to work with buildout.
(Note: Buildout uses PackageIndex to locate and fetch distributions.
It then installs distributions itself. if the distribution is
already an egg, then this is straightforward. Otherwise, buildout
invokes easy_install to do the installation. It can't get a return
value from easy_install, so it uses an Environment to find the egg
that easy_install created.)
Jim Fulton mailto:jim at zope.com Python Powered!
CTO (540) 361-1714 http://www.python.org
Zope Corporation http://www.zope.com http://www.zope.org
More information about the Distutils-SIG