# https://hub.docker.com/_/python

# https://stackoverflow.com/questions/48561981/activate-python-virtualenv-in-dockerfile

# First stage is the builder or compiler

FROM python:3.8-slim as compiler

ENV PYTHONUNBUFFERED 1

WORKDIR /app

RUN python -m venv /opt/venv

# Enable venv

ENV PATH="/opt/venv/bin:$PATH"

COPY ./requirements.txt /app/requirements.txt

RUN pip install --no-cache-dir --upgrade --requirement requirements.txt

# First stage is the runner

FROM python:3.8-slim as runner

WORKDIR /app

COPY --from=compiler /opt/venv /opt/venv

# Enable venv

ENV PATH="/opt/venv/bin:$PATH"

COPY . /app/

# This is used instead of 'entrypoint' in docker-compose.yml.

# Note: The stackoverflow answers state virtualenv is not needed most of the time.

CMD ["/bin/bash" ]