Heroku buildpack: Buildout

This is a Heroku buildpack for Python apps, powered by Buildout.

Usage

Example usage, first create a Heroku app:

$ heroku create

This buildpack depends on the official Heroku Python buildpack, so you need to configure your app with support for multiple buildpacks.

$ heroku buildpacks:add heroku/python
$ heroku buildpacks:add https://github.com/niteoweb/heroku-buildpack-buildout.git

Use the requirements.txt file to install the wanted version of pip, setuptools and zc.buildout. The Heroku Python buildpack know how to use pip to install libraries listed in requirements.txt so you just need to add the file.

The buildpack will detect your app as a Buildout-powered-Python app if the repo has the buildout.cfg file in root. The buildpack will use Python compiled by heroku-buildpack-python to run Buildout to build your environment.

$ cat buildout.cfg
[buildout]
relative-paths = true
...

Note that you have to set relative-paths = true in your buildout.cfg file.

Next, you need to tell Heroku how to run your app once Buildout builds it:

$ cat Procfile
bin/<your app start command>

Lastly, push your changes to Heroku to build your app:

$ git push heroku master
...
-----> Fetching custom git buildpack... done
-----> Buildout app detected
-----> Use build cache
-----> Read BUILDOUT_CFG from env vars, or use default
-----> Read BUILDOUT_VERBOSITY from env vars, or use default
-----> Init buildout
...
-----> Run bin/buildout -c buildout.cfg
...
-----> Copy results to cache
-----> Copy results to slug
       Done
-----> Discovering process types
       Procfile declares types -> web

Options

Set Python version

You can set an arbitrary Python version with a runtime.txt file.

$ cat runtime.txt
python-3.5.0

Other runtimes are available as well.

Set Buildout verbosity

To increase the Buildout's verbosity, set the following environment variable:

$ heroku config:add BUILDOUT_VERBOSITY=-v

You can increase verbosity up to -vvvv.

Use arbitrary `*.cfg` file

To run an arbitrary *.cfg file such as heroku.cfg, set the following environment variable:

$ heroku config:add BUILDOUT_CFG=heroku.cfg

Remember that you have to set relative-paths = true in your arbitrary *.cfg file.