[Zope3-dev] Re: RFC: Zope Configuration Egg Support

[Jim Fulton]

Rocky Burt wrote:
> On Mon, 2006-23-10 at 06:48 -0400, Jim Fulton wrote:
>> Lennart Regebro wrote:
>>> On 10/22/06, Jim Fulton <jim at zope.com> wrote:
>>>> I've created a small proposal to add egg support to zope.configuration:
>>>>
>>>>    http://zope3.zwiki.org/ZopeConfigurationEggSupport
>>> Shouldn't the egg work as a package, so that you still can use the
>>> package attribute?
>> If an egg installs a package and if the package isn't a namespace
>> package, and if the egg isn't zipped, then yes, the package mechanism
>> will work.
> 
> Yeah I have to admit I'm a little confused here as well.  I thought the
> promise of eggs was that whatever's contained within ... as long as the
> egg is on the PYTHONPATH ... would automatically have it's packages made
> available for import. 

Yes

> Seems strange to have to differentiate between
> "regular" packages and egg-available packages.  Perhaps I'm expecting
> too much from eggs... having been spoiled by jars.

We aren't taking about import. We are talking about reading files.

You can't use the same API for reading files from eggs (or jars) and
for reading files from a file system.  The current package option
reads data from the file system.

Perhaps we should change the package option so that it uses the pkg_resources
API to load ZCML files from packages.  There are still cases where egg != package
that would need to be addressed specifically.

> Does the API which provides egg support have anything like this?
> http://java.sun.com/javase/6/docs/api/java/lang/ClassLoader.html#getResource(java.lang.String)
> 
> If so, I would expect the ZCML loading mechanism to simply use that when
> looking for zcml files.

We're not taking about import or loading objects from Python modules. We're talking about
loading files.

Jim

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