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Packaging and Dependency Management

Python projects can incur a number of dependencies. pip can be handy, but we've had better luck with distributing a vendor library.

For the basics, read Zamboni packaging as well as :ref:`playdoh:packages`.

Updating a Library

Let's say we want to update Django to 1.3. We already have Django setup in our requirements/prod.txt as well as a submodule of our vendor directory.

prod.txt:

-e git://github.com/django/django@1.2.5#egg=django

So we're on Django 1.2.5. We want to go to Django 1.3. We edit prod.txt:

-e git://github.com/django/django@1.3#egg=django

Save and quit, puts us back on the command line.:

$ git submodule update --recursive
$ pushd vendor
$ git pull
$ git submodule update --recursive
$ pushd src/django
$ git checkout origin/1.3
$ popd
$ git add src/django
$ git commit -m"Bug 1235 Upgrading to Django 1.3"
$ git push origin master
$ popd
$ git add vendor requirements/prod.txt
$ git commit -m"Bug 1235 Upgrading to Django 1.3"
$ git push origin master

Now other developers can pick up your changes into their virtualenv and IT can pickup your changes in vendor and push out to the web heads.

Upgrading Libraries

To keep up-to-date, one should occassionally do:

pip install --upgrade -r requirements/compiled.txt
pushd vendor
git submodule --update --init
popd

This will refresh the libraries you've installed with their latest tagged version.

Todo

Write tools to automate this.

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