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FROM python:3 as build-system

RUN pip install -U pip

COPY requirements.txt requirements.txt

### create temporary image used to download and vendor packages using private key ###
FROM build-system as intermediate

# add credentials on build
ARG SSH_PRIVATE_KEY
RUN mkdir /root/.ssh/
RUN echo "${SSH_PRIVATE_KEY}" > /root/.ssh/id_rsa
RUN chmod 600 /root/.ssh/*
RUN ssh-keyscan github.com >> /root/.ssh/known_hosts

# vendor python dependencies
RUN pip download -r requirements.txt -d /vendor/python

### create the runtime image ###
FROM build-system as runtime

# install vendored python dependencies
COPY --from=intermediate /vendor/python /vendor/python
RUN pip install /vendor/python/*

SSH_PRIVATE_KEY=`cat ~/.ssh/id_rsa`

build-image:
	docker build . --build-arg SSH_PRIVATE_KEY="${SSH_PRIVATE_KEY}"

git+ssh://git@github.com/{user-or-group}/{repo}.git@{optional-tag-or-commit_hash}#egg={package_name}