Build minimal Python environment with Pydantic

Dockerfile

# Build with:
# DOCKER_BUILDKIT=1 docker build --progress=plain --target pydantic_env --tag pydantic-test-env --file ./pydantic/pydantic.static.Dockerfile .
#
# Uses multi-stage builds.
#
# Stage 1: Temporarity builder
FROM python:3.9.2-slim-buster as builder

ARG PYDANTIC_VERSION=1.8.1

ENV LANG=C.UTF-8 LC_ALL=C.UTF-8

# Install python packages
RUN set -eux \
    && cd /tmp/ \
    # Install build dependencies
    && apt-get update \
    && apt-get install --quiet --yes --no-install-recommends \
        # `build-essential` contains gcc: https://packages.debian.org/buster/build-essential
        build-essential \
    && apt-get clean \
    # Install python packages with pip using compilation
    && python -m pip install --upgrade pip \
    # Install Python build dependencies
    && pip install --no-cache-dir \
        Cython==0.29.22 \
        pip \
        setuptools \
    # Install PyDantic
    && pip install \
        -vvv \
        --no-cache-dir \
        --no-binary pydantic \
        --global-option=build_ext \
        --global-option=-j8 \
        pydantic==${PYDANTIC_VERSION} \
    # Cleanup
    # Clean Python build deps
    && pip uninstall --yes \
        Cython \
        setuptools \
    # Cleanup build deps
    && apt-get purge --auto-remove --yes \
        build-essential \
    && apt-get clean \
    && rm --recursive --force /var/lib/apt/lists/* /tmp/* /var/tmp/*


# Stage 2: Final environent
FROM python:3.9.2-slim-buster as pydantic_env

ENV LANG=C.UTF-8 LC_ALL=C.UTF-8

# Copy Python env from builder to clean container image
COPY --from=builder /usr/local/lib/python3.9/site-packages /usr/local/lib/python3.9/site-packages

# Below is for testing:
#
# Some test files to make sure Pydantic works.
# Uncomment the next line if you have some tests.
# COPY --chown=555 ./pydantic/benchmark/ /test_benchmark/
# Ensure it works by running
# docker run pydantic-test-env python /test_benchmark/run.py

# Get size of pydantic env with:
# docker run pydantic-test-env /bin/bash -c 'du -sh /usr/local/lib/python3.9/site-packages/pydantic'

# List pydantic dir with sizes:
# docker run pydantic-test-env /bin/bash -c 'du -sh /usr/local/lib/python3.9/site-packages/pydantic/* | sort -h'

python.alpine.Dockerfile

# Build with:
# docker buildx build --progress=plain --load --target pydantic_env --tag pydantic-test-env-alpine --file ./python.alpine.Dockerfile .
#
# Uses multi-stage builds.
#
# Stage 1: Common image
FROM python:3.9.4-alpine3.13 as common

ENV LANG=C.UTF-8 LC_ALL=C.UTF-8

# Stage 2: Temporarity builder
FROM common as builder
# Install python packages
RUN set -eux \
    && cd /tmp/ \
    # Install build dependencies
    && apk add --no-cache --virtual .build-deps \
        alpine-sdk \
    && echo "gcc version: $(gcc --version )" \
    # Install python packages with pip using compilation
    && echo "python version: $(python --version )" \
    && echo "pip version: $(pip --version )" \
    # Install Python build dependencies
    && pip install --no-cache-dir \
        Cython==0.29.23 \
        setuptools==56.0.0 \
    # Install PyDantic
    && pip install \
        --verbose \
        --no-cache-dir \
        --no-binary pydantic \
        --global-option=build_ext \
        pydantic==1.8.1 \
    # Cleanup
    # Clean Python build deps
    && pip uninstall --yes \
        Cython \
        setuptools \
    # Cleanup
    && apk del .build-deps \
    && rm -rf /var/cache/apk/* /tmp/* /var/tmp/*


# Stage 3: Final environent
FROM common as pydantic_env

# Copy Python env from builder to clean container image
COPY --from=builder /usr/local/lib/python3.9/site-packages/ /usr/local/lib/python3.9/site-packages/

# Below is for testing:
#
# Some test files to make sure Pydantic works.
# Uncomment the next line if you have some tests.
# COPY --chown=555 ./benchmark/ /test_benchmark/
# Ensure it works by running
# docker run pydantic-test-env-alpine python /test_benchmark/run.py

# Get size of pydantic env with:
# docker run pydantic-test-env-alpine /bin/sh -c 'du -sh /usr/local/lib/python3.9/site-packages/pydantic'

# List pydantic dir with sizes:
# docker run pydantic-test-env-alpine /bin/sh -c 'du -sh /usr/local/lib/python3.9/site-packages/pydantic/* | sort'