Render a dockerfile from a template and pip requirements.txt. Docker caches each dockerfile command in it's own layer. By breaking out requirements.txt, each pip requirement goes into its own layer and build time improves.

Handles all the syntax allowed by pip in requirements.txt

Things like comments, whitespace, line continuations etc. that might choke a simpler solution. Uses the actual parser from pip so guaranteed* compatibility

* or your money back

Start with a copy your regular Dockerfile called Dockerfile.tmpl

Replace the pip install command that looks something like this:

RUN pip install -r requirements.txt

with some standard django template tags. djtempl will pass a tuple called pip_requirements into the template context.:

{% for req in pip_requirements %}
RUN pip install --upgrade {{ req }}{% endfor%}

djtempl -t ./Dockerfile.tmpl -p ./requirements.txt -d ./Dockerfile.out -q

pip install djtempl

djtempl.py is pure python and only requires django>=1.8.0

Please use the issue tracker to report any bugs or file feature requests.