[Zope3-Users] Re: [Zope3-dev] Known-good-sets problem

[Jim Fulton]

On Oct 5, 2007, at 10:45 PM, Benji York wrote:

> Stephan Richter wrote:
>> 2. How many packages should be controlled in this index? I think  
>> we should definitely add packages from z3c and the zc namespace.
>
> What is the motivation to include non-controlled packages?  I  
> suppose it is to let people use those packages with (in this case)  
> Zope 3.4.

Yes

>   What if someone wants Zope 3.4 and Twisted version X and Plone  
> version Y (just making those up).

That's why the KGS index is a PyPI mirror of all uncontrolled packages.

>   Perhaps we need a way to refer to several KGS when constructing  
> an application. Or is one KGS supposed to define a "universe" of  
> packages known to work together.  If so, I would think there would  
> be no place for non-controlled packages.

The semantics I think we want are kind of tricky. A KGS index needs  
to be authoritative for the projects it controls.  If we looked in  
multiple KGSs, there would need to be semantics for deciding which  
was authoritative.  setuptools lets you define a single index and  
multiple find-link servers.  The highest version found on any server  
is authoritative.  I think supporting multiple KGSs with the right  
semantics would be useful, but there isn't a way to do it in  
setuptools. We can achieve the  same effect on the server.  For  
example, with this software, you could chain several KGSs together.

Jim

--
Jim Fulton
Zope Corporation