[Distutils] repeatable and updatable virtualenv

Saint Germain saintger at gmail.com
Fri Mar 19 16:48:59 CET 2010

2010/3/19 Brad Allen <bradallen137 at gmail.com>:
> On Fri, Mar 19, 2010 at 10:23 AM, Saint Germain <saintger at gmail.com> wrote:
>> 2010/3/19 Brad Allen <bradallen137 at gmail.com>
>>> On Tue, Mar 16, 2010 at 2:26 AM, Chris Withers <chris at simplistix.co.uk>
>>> wrote:
>>> > Hi All,
>>> >
>>> > How can I set up a virtualenv in such a way that I can version control
>>> > the
>>> > packages and their versions that are installed in it?
>>> >
>>> > The answer would appear to a custom bootstrap script, but how would I
>>> > think
>>> > update an existing virtualenv when I added or removed packages or
>>> > changed
>>> > the version of a specific package?
>>> You could try envbuilder; I find it very helpful for setting up
>>> development environments repeatably when developing several related
>>> packages ('er, 'module distributions') simultaneously.
>>> It basically just creates a virtualenv, checks out/clones whatever you
>>> specify in the .env confiig file, and runs setup.py develop on each of
>>> the checked out packages into the virtualenv. Also, it provides a way
>>> to apply commands across all the checked out packages (like 'update'
>>> or 'status')
>>> http://pypi.python.org/pypi/envbuilder/0.1.4
>>> I think a similar functionality can be had using buildout with
>>> mr.developer, but I have not tried it yet. However as far as I know,
>>> buildout does not create a virtualenv (yet).
>> I'm currently trying more or less the same thing by combining buildout with
>> virtualenv and pip.
>> So far it's working without problem except the installation of develop eggs
>> (see my other message).
>> Buildout can create virtualenv without problem (see
>> http://pypi.python.org/pypi/rjm.recipe.venv/0.7) and can use pip to install
>> editable package (see http://pypi.python.org/pypi/gp.recipe.pip) under
>> version control (CVS, SVN, Mercurial...)
> Thanks for the tip!
>> Now if only I can solve the develop eggs issue, I would be very happy !
> What is that issue?

See here:

I think that it's not a bug or a missing functionality but it's just
that I haven't fully understand the whole thing about develop eggs.
The eggs are correctly generated but I haven't managed to install them

Anyway after it is solved, I can confirm that buildout + distribute +
virtualenv + pip is a very powerful combination !

Don't hesitate to ask questions if you want to use the same approach.
There are some points which are still rough and I need to send some
patch upstreams. But mainly it works (and rocks).


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