[Distutils] Better version pinning in buildout (buildout-versions)

[Maurits van Rees]

Op 06-01-13 23:03, Jim Fulton schreef:
> On Sun, Jan 6, 2013 at 3:51 PM, Reinout van Rees <reinout at vanrees.org> wrote:
>> On 05-01-13 23:47, Jim Fulton wrote:
>>>
>>> 1. New buildout option named ``versions-file`` which takes the name of
>>>      a file. to contain version information.  It is not a configuration
>>>      file.  It is a file consisting of comments (#...)  and version
>>>      specifications::
>>>
>>>        # whatever
>>>        foo = 1.3
>>
>>
>> So... basically pip's requirements.txt?
>
> I'm not familiar with pip's requirements.txt, but I suppose so,
> except that over time, this might have versions for things that are
> no-longer used, and, as you point out later, it might not be complete.

Pip's requirements.txt (run 'pip freeze') needs version specifications 
in the same format as easy_install, so with 'package == 1.0' (double 
equals-sign) or 'package >= 2.0', so it is not the same format.

> It would probably be saner to generate a pip requirements file from
> a buildout-generated script.  This wouldn't need a new feature.

A script (or extension, or core buildout) could read the pinned versions 
and basically do this:

sed 's/=/==/' versions.cfg > requirements.txt


-- 
Maurits van Rees: http://maurits.vanrees.org/
Zest Software: http://zestsoftware.nl