[Distutils] Buildout not updating setuptools

[Jim Fulton]

On Jul 8, 2007, at 12:56 PM, Phillip J. Eby wrote:

> At 07:17 AM 7/8/2007 -0400, Jim Fulton wrote:
>> So, the Ubuntu packager for setuptools decided not to install
>> setuptools as an actual egg, but as a wonky sort-of develop egg with
>> a less than ideal location.
>>
>> IMO, this is just wrong and broken. Does anyone disagree?
>
> Yes, because it's fine for them to install it as a develop egg;  
> that's how system packages are *supposed* to be installed.

Really? Why?  If this is true, then "develop" seems to be a misnomer.


> In other words, it's not wonky, unless they also changed something  
> besides just installing it  .egg-info style.
>
> Thus, if buildout is assuming that "DEVELOP_DIST" egg paths contain  
> only modules or packages that are part of that egg, it is broken.
>
> Note, for example, that as of Python 2.5, the distutils install  
> *all* packages with an .egg-info file, which is detected by  
> pkg_resources as a DEVELOP_DIST.  A plain old Python 2.5 install  
> with stock system packages will be chock full of develop-style  
> eggs, in other words, even if the packages in question didn't use  
> setuptools at all.
>
> This is by design.
>
> If you want to be able to figure out if something is really a  
> "develop" installation, you need to look for an .egg-link file, not  
> the mere existence of a DEVELOP_DIST egg.  Only the "develop"  
> command writes .egg-link files.

But you can't look for an egg-link file if all you have is a  
distribution.  The dist location points to the contents of the egg  
link file.  How is one to determine, given a DEVELOP_DIS egg in an  
environment whether it was created by the develop command?

Jim

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