[Zope] Deploying with buildout

Ross Patterson me at rpatterson.net
Tue Aug 28 17:55:20 EDT 2007

Chris McDonough <chrism at plope.com> writes:

> On Aug 27, 2007, at 10:59 PM, Ross Patterson wrote:
>> We have a Plone 3.0/Zope 2.10 application that we need to develop
>> on, maintain and
>> deploy to a ZEO server and multiple ZEO clients.  Currently we use svn
>> bundles of Zope and Plone and our own packages and products in one big
>> svn:externals definition.  We also use some more recent versions of
>> certain products and packages than those included in the upstream
>> svn:externals.  For example:
>> Zope svn://svn.zope.org/repos/main/Zope/branches/2.10
>> Zope/lib/python/zope/app/interface svn://svn.zope.org/repos/main/
>> zope.app.interface/trunk/src/zope/app/interface
>> Though I haven't seen any documentation to this effect, svn seems to
>> treat the second svn:externals as a "svn switch" on "svn up".
>> So one question I have is how would I "override" the versions of some
>> package like this using buildout?
> Putting these packages in your Zope instance home's "lib/python"
> directory should get them found before the others.  For Products, you
> can use an additional "products-path" directive in zope.conf and put
> files in there.  I don't know how to tell buildout to do either,
> though.

But wouldn't that cause problems in this case since zope.app.interface
is a package in two nested-namespace packages.  IOW, wouldn't putting
zope/app/interface in $INSTANCE_HOME/lib/python mean that it was the
only package in the zope or zope.app namespace packages?

>> Another question I have is that there aren't releases for all the
>> dependencies our application has.  I'm wondering what the best way
>> is to
>> define a canonical release for deployment to our cluster.  Ideally,
>> we'd
>> have a buildout (or whatever) on a staging server where we're testing
>> the candidate for deployment and then when all tests pass that *exact*
>> source should be deployed to the cluster.
> I always use a vendor import for this (to a separate CVS server, I
> don't use SVN).

Yeah, I guess that what we'll end up doing.

>>   How might one do this without
>> upstream releases?  Is there a way to get buildout and setuptools to
>> play together so that I can build a source distribution from the test
>> passing buildout on staging?  Is there a way I can have a buildout on
>> each cluster node such that a simple ./bin/buildout will get the
>> latest
>> deployment release for that node?
> Personally I use a script that knows about all of the revisions of all
> of the products and packages I want to deploy, and which creates  a
> "sandbox", downloading and installing all of them (as well as
> creating instances, etc).  It doesn't work very well for upgrades,
> but for starting a sandbox fresh, it's fine.  See http://
> agendaless.com/Members/chrism/software/buildit and http://
> www.plope.com/Members/chrism/buildit_example .

Thanks, I'll check it out.


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