0004 Using Poetry exclusively for locking dependencies

UPDATE: Poetry 1.8.0 has been released, which introduces the non-package mode, solving many of the pain points described in here. I'll keep the old information and include a correction afterwards, so we all can see in posperity the basic shit they figured out too fucking late.

The bare minimum of bullcrap you'll have to accept in order to use Poetry exclusively for locking dependencies. No virtualenvs, no build system, no magic fuckery. Just lock dependencies.

Some amount of bullcrap might disappear once this issue is resolved or potentially this pull request is merged. Subscribe to those threads.

UPDATE: Guess what.

First, let's install poetry with the official installer instead of using pipx. Why? Because the installer is many orders of magnitude simpler than pipx so you don't depend on a package manager to install another package manager. You're welcome.

curl -sSL | python3 -
# Yes, I pipe curl to python. Email me so we can fist fight.

Poetry assumes you always want virtual envs, but you don't.

# Option A: Config setting that lives somewhere in your system and
# I won't be the one investigating where.
poetry config virtualenvs.create false

# Option B: Keep this environment variable with this value all the
# time, maybe in your dotfiles? idk.

Poetry assumes you always want a full fledged Python package so you can publish it on PyPI and ashame your friends and colleagues, but you don't. Sadly, Poetry doesn't care about your feelings, so you'll need to add tons of unnecessary shit in your pyproject.toml anyway.

name = "goatse"
version = "0.0.0"
description = ""
authors = ["Poor Bastard <>"]

python = "^3.11"

# Everything above this line is shit so Poetry doesn't complain.
# Your dependencies go here!
flask = { version = "2.3.3" }

UPDATE: It got simpler after Poetry 1.8.0 folks! Rejoice in eventual sanity! Now it looks like this:

package-mode = false

python = "^3.11"

# Everything above this line is shit so Poetry doesn't complain.
# Your dependencies go here!
flask = { version = "2.3.3" }

And now you can install your dependencies.

Now with Docker baby

The pain isn't over.

# Explicit version


# woosh ✨

Changing POETRY_HOME isn't necessary, but looking into the documentation to know what's the actual place it puts poetry by default so you can extend PATH is necessary. Now making POETRY_HOME explicit doesn't sound that bad huh.

ENV PATH="/poetry/bin:${PATH}"

Probably you should download the install script into source control and copy it into the container instead. This is an example okay?

RUN curl -sSL | python -

RUN poetry config virtualenvs.create false
# Or...

It's good practice to copy first the files containing the dependencies, install them, and then copy the rest of the sources, so rebuilding because the code changed doesn't take forever. Optimize your Docker cache folks.

COPY ./pyproject.toml /app/pyproject.toml
COPY ./poetry.lock /app/poetry.lock

We're inside a Docker build, no stdin can help you here, so use --no-interaction in poetry install.

Poetry assumes you always want a full fledged Python package, again, and tries to build stuff which involves verifying that your code is actually where it's supposed to be. If your project is called goatse, will look for the goatse folder and fail, because it isn't there yet, because we're trying to optimize the Docker build. Add --no-root and dodge the issue.

RUN cd /app && poetry install --no-root --no-interaction

UPDATE: The whole paragraph above doesn't apply anymore because there's no package to manage, finally.

RUN cd /app && poetry install --no-interaction

And we're done.