Install Poetry in Docker devcontainer

Dockerfile

USER vscode
RUN curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python - --version=0.12.17
ENV PATH "/home/vscode/.poetry/bin:$PATH"

@bearrito
What I do is I set the config to create the virtualenv in the project directory, which also makes it no longer ephemeral with the container.
You can accomplish this using RUN /home/vscode/.local/bin/poetry config virtualenvs.in-project true. I just find it easier for my workflow to have the environment in project tree.

poetry update is then called in the terminal on vscode. As for dealing with the interpreter and whatnot, because the virtualenv is inside the project, there is a clear path for it in /workspace/vscode/[project]/.venv/bin/[util] which you can set in your .vscode/settings.json or in .devcontainer/devcontainer.json.

I've seen people set virtualenvs.create false and then use RUN /home/vscode/.local/bin/poetry install in the Dockerfile too. I would imagine that would get rid of the need to separately set the location of your paths. If you want to avoid having to specify all of the path for each time you run poetry in your Dockerfile, I believe you should be able to accomplish that via multi-stage builds, but I am a creature of habit and never tried it.

You can set "postCreateCommand": "poetry update" in .devcontainer/devcontainer.json.

You could also set the variable in the local poetry config file poetry.toml:

[virtualenvs]
in-project = true

Or using the CLI:

poetry config virtualenvs.in-project true --local