Dockerfile

# `python-base` sets up all our shared environment variables
FROM python:3.10.15-slim-bookworm as python-base

    # python
ENV PYTHONUNBUFFERED=1 \
    # prevents python creating .pyc files
    PYTHONDONTWRITEBYTECODE=1 \
    \
    # pip
    PIP_NO_CACHE_DIR=off \
    PIP_DISABLE_PIP_VERSION_CHECK=on \
    PIP_DEFAULT_TIMEOUT=100 \
    \
    # poetry
    # https://python-poetry.org/docs/configuration/#using-environment-variables
    POETRY_VERSION=1.8.3 \
    # make poetry install to this location
    POETRY_HOME="/opt/poetry" \
    # make poetry create the virtual environment in the project's root
    # it gets named `.venv`
    POETRY_VIRTUALENVS_IN_PROJECT=true \
    # do not ask any interactive question
    POETRY_NO_INTERACTION=1 \
    \
    # paths
    # this is where our requirements + virtual environment will live
    PYSETUP_PATH="/opt/pysetup" \
    VENV_PATH="/opt/pysetup/.venv"

# prepend poetry and venv to path
ENV PATH="$POETRY_HOME/bin:$VENV_PATH/bin:/root/.cargo/bin:$PATH"


# `builder-base` stage is used to build deps + create our virtual environment
FROM python-base as builder-base

RUN apt-get update
RUN apt-get upgrade -y; apt-get install --no-install-recommends -y build-essential curl libpq-dev postgresql-client && \
    rm -rf /var/lib/apt/lists/*
RUN curl https://sh.rustup.rs -sSf | \
    sh -s -- --default-toolchain stable -y

# install poetry - respects $POETRY_VERSION & $POETRY_HOME
RUN curl -sSL https://install.python-poetry.org | python -

# copy project requirement files here to ensure they will be cached.
WORKDIR $PYSETUP_PATH
COPY poetry.lock pyproject.toml ./

# install runtime deps - uses $POETRY_VIRTUALENVS_IN_PROJECT internally
RUN poetry install --only main


# `production` image used for runtime
FROM python-base as production

# Update all packages and add home folder for nobody user
RUN apt-get update && apt-get upgrade -y; \
    rm -rf /var/lib/apt/lists/* && \
    mkdir -p /nonexistent && chown -R 65534:65534 /nonexistent

# Remove vulnerable setuptools version (CVE-2024-6345)
RUN pip3 uninstall setuptools -y

USER nobody

# Copy dependencies from build container
WORKDIR /app
COPY --from=builder-base $PYSETUP_PATH $PYSETUP_PATH
COPY --from=builder-base /usr/lib/ /usr/lib/

# Copy source code
COPY . ./

# set env
ENV PYTHONPATH="${PYTHONPATH}:/app"

# Start application
ENTRYPOINT ["python"]
CMD ["src/main.py"]