[Python-modules-team] parallel installation of pyro 3.x and 4.x (was Pyro 4 in Debian)

[Alexandre Fayolle]

I'm forwarding the message below (with some slight editing) to the pyro-core 
mailing list for feedback. 

Irmen, in order to ease parallel installation of pyro3 and pyro4, would you 
mind changing the package name of pyro4 from 'pyro' to 'pyro4'? I think this 
would be beneficial for many users and that it would ease migration to pyro 4 
(by easing the detection of which version is installed, and allowing legacy 
application to run side by side with new apps). Being able to have both 
versions installed is a must have from a system administration point of view 
(both installed on the same machine, and both running on the same LAN). 

Logilab is a pyro 3 heavy user (with the Cubiweb [1] framework), and we cannot 
afford to migrate to pyro 4 right now. 

Thanks for your feedback. 

[1] http://www.cubicweb.org/

----------  Forwarded Message  ----------

Subject: [Python-modules-team] please provide 2 packages: pyro and pyro4
Date: Thursday 12 August 2010, 10:55:56
From: Alexandre Fayolle <afayolle at debian.org>
To: 589172 at bugs.debian.org
CC: python-modules-team at lists.alioth.debian.org

As Sylvain said, pyro4 changes the ABI and therefore this update breaks any 
application deployed on the system depending on pyro 3.x. 

The best move imo would be to keep pyro4 in Debian experimental, since most 
users are using the official stable release (3.x branch), and to revert to pyro3 
in sid/testing. 

I suggest providing 2 packages pyro and pyro4, which could at first conflict 
with each other. I think upstream should be contacted, and asked to change the 
namespace of pyro 4.x to pyro4 in order to ease parallel installation of both 
versions. 

In any case, please do not release squeeze with pyro 4.x as "pyro". This will 
be very painful. We really want pyro 3.9 in squeeze, as 4.x will break 
external applications. 

I'll be happy to help on this matter once 
-- 
Alexandre Fayolle                              LOGILAB, Paris (France)
Formations Python, CubicWeb, Debian :  http://www.logilab.fr/formations
Développement logiciel sur mesure :      http://www.logilab.fr/services
Informatique scientifique:               http://www.logilab.fr/science

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-----------------------------------------
-- 
Alexandre Fayolle                              LOGILAB, Paris (France)
Formations Python, CubicWeb, Debian :  http://www.logilab.fr/formations
Développement logiciel sur mesure :      http://www.logilab.fr/services
Informatique scientifique:               http://www.logilab.fr/science