Dockerfile-alpine3.15-x86_64

# based on https://github.com/docker-library/python/blob/8d48af512dc58e9c29c9d4ee59477c195a29cbdc/3.10/alpine3.13/Dockerfile

FROM alpine:3.15

ENV PYTHON_VERSIONS="3.8.13 3.9.11 3.10.3"

# http://bugs.python.org/issue19846
# > At the moment, setting "LANG=C" on a Linux system *fundamentally breaks Python 3*, and that's not OK.
ENV LANG C.UTF-8

# runtime dependencies
RUN set -eux; \
    apk add --no-cache \
      # install ca-certificates so that HTTPS works consistently
      ca-certificates \
      # and tzdata for PEP 615 (https://www.python.org/dev/peps/pep-0615/)
      tzdata \
      bash \
      rsync \
      cmake \
      zlib-dev \
    \
    && apk add --no-cache --virtual .fetch-deps \
       gnupg \
       tar \
       xz \
    \
    && apk add --no-cache --virtual .build-deps \
       bluez-dev \
       bzip2-dev \
       coreutils \
       dpkg-dev dpkg \
       expat-dev \
       findutils \
       gcc \
       gdbm-dev \
       libc-dev \
       libffi-dev \
       libnsl-dev \
       libtirpc-dev \
       linux-headers \
       make \
       ncurses-dev \
       openssl-dev \
       pax-utils \
       readline-dev \
       sqlite-dev \
       tcl-dev \
       tk \
       tk-dev \
       util-linux-dev \
       xz-dev \
       \
    \
    && for PYTHON_VERSION in $PYTHON_VERSIONS; do \
       wget -O python.tar.xz "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz" \
       && mkdir -p /usr/src/python \
       && tar -xJC /usr/src/python --strip-components=1 -f python.tar.xz \
       && rm python.tar.xz \
       && ( \
         cd /usr/src/python \
         && gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
         && ./configure \
            --prefix=/usr \
            --build="$gnuArch" \
            --enable-loadable-sqlite-extensions \
            --enable-optimizations \
            --enable-option-checking=fatal \
            --enable-shared \
            --with-system-expat \
            --with-system-ffi \
            --without-ensurepip \
         && make -j "$(nproc)" \
            # set thread stack size to 1MB so we don't segfault before we hit sys.getrecursionlimit()
            # https://github.com/alpinelinux/aports/commit/2026e1259422d4e0cf92391ca2d3844356c649d0
                   EXTRA_CFLAGS="-DTHREAD_STACK_SIZE=0x100000" \
                   LDFLAGS="-Wl,--strip-all" \
         && make install \
         ) \
       && rm -rf /usr/src/python ; \
    done \
    \
    && find /usr -depth \
            \( \
                    \( -type d -a \( -name test -o -name tests -o -name idle_test \) \) \
                    -o \( -type f -a \( -name '*.pyc' -o -name '*.pyo' -o -name '*.a' \) \) \
            \) -exec rm -rf '{}' + \
    \
    && find /usr -type f -executable -not \( -name '*tkinter*' \) -exec scanelf --needed --nobanner --format '%n#p' '{}' ';' \
       | tr ',' '\n' \
       | sort -u \
       | awk 'system("[ -e /usr/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
       | xargs -rt apk add --no-cache --virtual .python-rundeps \
    \
    && apk del --no-network .fetch-deps \
    && apk del --no-network .build-deps

RUN set -ex; \
    for PYTHON_VERSION in $PYTHON_VERSIONS; do \
      \
      MAJOR_VERSION=$(python3 -c "print(\"$PYTHON_VERSION\".rsplit(\".\", 1)[0])") \
      \
      && python$MAJOR_VERSION -m ensurepip --upgrade ; \
    done \
    && find /usr -depth \
       \( \
         \( -type d -a \( -name test -o -name tests -o -name idle_test \) \) \
         -o \
         \( -type f -a \( -name '*.pyc' -o -name '*.pyo' \) \) \
       \) -exec rm -rf '{}' + \
    && rm -rf ~/.cache \
    \
    && ln -s /usr/bin/python3 /usr/bin/python \
    \
    # Install virtualenv
    && python3 -m pip install virtualenv \
    && mkdir -p ~/.local/bin \
    && ln -s /usr/bin/virtualenv ~/.local/bin/virtualenv

# Run Python selection on way into image
COPY choose_python.sh /usr/bin/
ENTRYPOINT ["/usr/bin/choose_python.sh"]