[Zope3-dev] Re: zope.viewlet breaking buildout?

[David Pratt]

Jim Fulton wrote:
> 
> On Apr 16, 2007, at 11:30 PM, David Pratt wrote:
> 
>> Thanks Jim. Where is PILwoTk located at the moment?

Hi Jim. Thank you for this.

> 
> http://download.zope.org/distribution/PILwoTk-1.1.5.1.tar.gz
> 
>> I'll look to pull it in with a dev egg in the short term in the 
>> buildout to satisfy the dependency until this is more widely available.
> 
> I have no idea how you would do that.

For code like this that is not in eggs, I create a setup and structure 
for it - then store it as a package in vendor sources in svn. I have a 
/dev folder in root of my buildout. My buildouts are in svn. I use 
svn:externals to bring the package into the /dev folder of my buildout. 
I add the package to my buildout like this

[buildout]
develop = .
           dev/some-source-package

When I check it out the buildout and run, a dev egg is made and the 
dependency met.

> I don't see how that would work, given that requirements often arise 
> from new distributions installed while running the buildout.

The pre-flight is just an idea at the moment. Buildouts present 
constantly changing dependencies as different package releases are made. 
I can see some buildouts getting into the one to two hundred egg range. 
I guess from my perspective, it would be helpful to see some sort of 
globally generated dependency output for a buildout (opposed to through 
each package's setup or the egg info produced).

I'm also wanting some assurance that a buildout will run to completion 
without fear that a recent package revision or change will break it, 
particularly for deployment. I don't want dependency issues to be a 
factor in killing the automation from executing properly - so have been 
thinking about this in any case. This potential exists even if the 
buildout has successfully run before. Many thanks.

Regards,
David

> Also, at least in the case of installing eggs, I don't really see any 
> harm in attempting the installation.  Nothing gets uninstalled as part 
> of egg installation.
> 
> I think what's needed, as I mentioned before, is output of those 
> distributions that required the distribution that couldn't be found.  I 
> plan to provide this.
> 
> Jim
> 
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> Jim Fulton            mailto:jim at zope.com        Python Powered!
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