From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andreas Enge <andreas@enge.fr>
Subject: Re: Different versions of a package in the same profile?
Date: Sat, 1 Nov 2014 11:46:10 +0100
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To: Ludovic =?iso-8859-15?Q?Court=E8s?= <ludo@gnu.org>
Cc: guix-devel@gnu.org, Alex Kost <alezost@gmail.com>

On Fri, Oct 31, 2014 at 12:07:14AM +0100, Ludovic Courtès wrote:
> Technically it would be easy to allow the installation of different
> versions of a package in the same profile, but I wonder about the
> implications.
> 
> For instance, ‘-u foo’ would upgrade all the installed versions of
> ‘foo’, so you would end up with exactly the same version twice.

Good catch (or rather "bad feature"?).

So should we indeed rename version 2 of the python package to python2, to
allow easy installation together with python version 3?

We could do the same for Qt, but if anyway versions 4 and 5 are not
installable together, there does not seem to be a need.

How about guile?

In any case, the outcome of installation should not depend on whether we
do them in one or in several commands.

Another idea: How about letting "guix package -u foo" upgrade only the
package with name foo and the latest version if there are several with the
same name?

Andreas