[Zope-CMF] Re: [Zope-PAS] Re: Eggification redux

Philipp von Weitershausen philipp at weitershausen.de
Tue Sep 25 07:55:18 EDT 2007

On 25 Sep 2007, at 13:20 , Jim Fulton wrote:
> On Sep 25, 2007, at 3:40 AM, Philipp von Weitershausen wrote:
>> Charlie Clark wrote:
>>> Am 25.09.2007 um 02:05 schrieb Tres Seaver:
>>>> I'd like to break the remaining CMF packages out (moving from '/ 
>>>> CMF' to
>>>> 'Products.CMFCore', 'Products.CMFDefault', etc.) and push the  
>>>> 2.1.0 eggs
>>>> out, as well as equivalent changes for PluggableAuthService and
>>>> PluginRegistry.
>>>> Any objections, or other thoughts?
>>> While I am very sceptical about the move to eggs (I know it's  
>>> inevitable) and I hope we can avoid some of the problems that  
>>> seem to be affecting Grok as a result.
>> Grok's problems are primarily related to the lack of a working set  
>> definition for Zope 3.
> I don't know what you mean by this.

There are several problems.

* We've had to nail some of the versions because buildout was being a  
bit over-zealous when getting eggs on Windows. It would take the  
newest egg, despite the fact that other eggs had binary releases. I  
guess that's not its fault. But it's a working set problem.

* When package A depends on Y and package B also depends on Y, but  
with some version restrictions, buidout will first try to get the  
newest version of Y when installing A. But then when installing B, it  
is likely that it has to get a different version of Y. The result is  
a version conflict. This could also easily be fixed with a working  
set that dictates which versions would be used from the beginning.

* Even with newest=false enabled in grokproject's buildout.cfg  
template, the versions that people will end up when trying out grok  
are non-deterministic. This has led to people installing newer  
versions of something, sometimes even faulty releases, even though  
Grok hadn't been tested with these newer versions yet and older  
versions that were known to work were the better choice. Again, a  
working set problem.

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