[Distutils] Reverse dependencies
optilude at gmx.net
Sun May 13 18:00:01 CEST 2007
I'm finding myself in the following situation.
I'm writing package my.app, which encapsulates higher level concepts
specific to my application. My application runs on Plone, targeting
version 3, which runs on Zope 2.10 and sits on top of CMF 2.1.
Now, I want to depend on your.package, which provides some autonomous
functionality, say support for a particular use case or application policy.
I want to be able to get bugfixes and incremental improvements for
your.package in the future, and when other people install my.app I'd
like them to have the latest appropriate version of your.package.
Let's say your.package version 1.5 targets Plone 3 and Zope 2.10. At
this point I can't know if there'll be a 1.6 or a 1.7 or whatever also
targeting Plone 3. At some point, maybe version 2.0, maybe 1.8, maybe
4.5, it's possible that your.package will stop working on Plone 3. At
this point, someone installing my.app may inadvertently get an
incompatible version of your.package, if I have a broad (or lazy)
What I'd like to be able to say, is "I run on Plone 3, CMF 2.1, Zope
2.10, Python 2.5" -- these are my "framework" realities -- and I'd like
the latest version of your.package supporting this platform.
For that to work, your.package would need to declare such compatibility.
If it doesn't, I'd need to research and encode this in my own
install_requires. I may need to change it in the future, when the
roadmap for your.package becomes more clear.
The safe choice is possibly to declare a very narrow version
(>=1.5<1.6), at the risk of losing out on bug fixes.
But is there any support for such declarative "reverse" dependencies? Is
it something worth exploring further?
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