`poetry install` needs a `--force-root` or similar flag for Docker

I’ve been hacking at this for a couple hours now and I can’t find an elegant way to use poetry to install dependencies inside of a Docker container (during build).

It either creates it’s own virtualenv which is tricky to use when you’re doing multistage or multi-base (docker compose) deployments. Or, if you supply a .venv it won’t activate it properly and installs can fail.

RUN curl -sSL https://raw.githubusercontent.com/sdispater/poetry/master/get-poetry.py | python
COPY ./pyproject.toml /app
COPY ./pyproject.lock /app
RUN python -m poetry install --no-interaction --allow-root-install

I propose a documented config setting along the lines of settings.virtualenvs.use_root true or a install flag which conveys this as an exception to the normal flow.

[sdispater]

If you don’t want poetry to automatically create virtualenvs you can set the settings.virtualenvs.create to false like so:

poetry config settings.virtualenvs.create false

[blakev]

This does not work anymore as of poetry 0.12.1