Unofficial Heroku buildpack: Python + npm dependency resolution
The main difference from the official Python buildpack is support for node dependencies via npm.
This is accomplished via an
npm_requirements.txt which must be in the base directory (along with the
requirements.txt file that is used by pip)
npm_requirements.txt file is present it works similar to the way you're used to with pip.
Each line of the file is appended to
npm install so for example
would result in the following commands being run to resolve the dependencies:
$ npm install -g coffee-script $ npm install -g firstname.lastname@example.org
Why install Node along with Python?
$ ls Procfile requirements.txt web.py $ heroku create --stack cedar --buildpack email@example.com:jiaaro/heroku-buildpack-django.git $ git push heroku master ... -----> Heroku receiving push -----> Fetching custom build pack... done -----> Python app detected -----> Preparing virtualenv version 1.6.4 New python executable in ./bin/python Installing setuptools............done. Installing pip...............done. -----> Installing dependencies using pip version 1.0.2 Downloading/unpacking Flask==0.7.2 (from -r requirements.txt (line 1)) Downloading/unpacking Werkzeug>=0.6.1 (from Flask==0.7.2->-r requirements.txt (line 1)) Downloading/unpacking Jinja2>=2.4 (from Flask==0.7.2->-r requirements.txt (line 1)) Installing collected packages: Flask, Werkzeug, Jinja2 Successfully installed Flask Werkzeug Jinja2 Cleaning up...
The buildpack will detect your app as Python if it has the file
requirements.txt in the root. It will detect your app as Python/Django if there is an additional
settings.py in a project subdirectory.
It will use virtualenv and pip to install your dependencies, vendoring a copy of the Python runtime into your slug. The
lib/ directories will be cached between builds to allow for faster pip install time.
To use this buildpack, fork it on Github. Push up changes to your fork, then create a test app with
--buildpack <your-github-url> and push to it.
To change the vendored virtualenv, unpack the desired version to the
src/ folder, and update the virtualenv() function in
bin/compile to prepend the virtualenv module directory to the path. The virtualenv release vendors its own versions of pip and setuptools.
If you've already deployed an app to heroku and you'd like to switch to this buildpack from the standard python buildpack, just run the following command with the heroku command line app:
heroku config:add BUILDPACK_URL=git://github.com/jiaaro/heroku-buildpack-django.git