Dockerfile

FROM docker:19.03.11

# Copied from https://github.com/docker-library/python/blob/2d63cd17c78a868e35479463b8470c0eb3a30096/3.8/alpine3.12/Dockerfile

# ensure local python is preferred over distribution python
ENV PATH /usr/local/bin:$PATH

# 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 \
	;
# other runtime dependencies for Python are installed later

ENV GPG_KEY E3FF2839C048B25C084DEBE9B26995E310250568
ENV PYTHON_VERSION 3.8.7

RUN set -ex \
	&& apk add --no-cache --virtual .fetch-deps \
		gnupg \
		tar \
		xz \
	\
	&& wget -O python.tar.xz "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz" \
	&& wget -O python.tar.xz.asc "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz.asc" \
	&& export GNUPGHOME="$(mktemp -d)" \
	&& gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys "$GPG_KEY" \
	&& gpg --batch --verify python.tar.xz.asc python.tar.xz \
	&& { command -v gpgconf > /dev/null && gpgconf --kill all || :; } \
	&& rm -rf "$GNUPGHOME" python.tar.xz.asc \
	&& mkdir -p /usr/src/python \
	&& tar -xJC /usr/src/python --strip-components=1 -f python.tar.xz \
	&& rm python.tar.xz \
	\
	&& apk add --no-cache --virtual .build-deps  \
		bluez-dev \
		bzip2-dev \
		coreutils \
		dpkg-dev dpkg \
		expat-dev \
		findutils \
		gcc \
		gdbm-dev \
		libc-dev \
		libffi-dev \
		libnsl-dev \
		libtirpc-dev \
		linux-headers \
		make \
		ncurses-dev \
		openssl-dev \
		pax-utils \
		readline-dev \
		sqlite-dev \
		tcl-dev \
		tk \
		tk-dev \
		util-linux-dev \
		xz-dev \
		zlib-dev \
# add build deps before removing fetch deps in case there's overlap
	&& apk del --no-network .fetch-deps \
	\
	&& cd /usr/src/python \
	&& gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
	&& ./configure \
		--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 \
	\
	&& find /usr/local -depth \
		\( \
			\( -type d -a \( -name test -o -name tests -o -name idle_test \) \) \
			-o \( -type f -a \( -name '*.pyc' -o -name '*.pyo' -o -name '*.a' \) \) \
			-o \( -type f -a -name 'wininst-*.exe' \) \
		\) -exec rm -rf '{}' + \
	\
	&& find /usr/local -type f -executable -not \( -name '*tkinter*' \) -exec scanelf --needed --nobanner --format '%n#p' '{}' ';' \
		| tr ',' '\n' \
		| sort -u \
		| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
		| xargs -rt apk add --no-cache --virtual .python-rundeps \
	&& apk del --no-network .build-deps \
	\
	&& python3 --version

# make some useful symlinks that are expected to exist
RUN cd /usr/local/bin \
	&& ln -s idle3 idle \
	&& ln -s pydoc3 pydoc \
	&& ln -s python3 python \
	&& ln -s python3-config python-config

# if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
ENV PYTHON_PIP_VERSION 21.0
# https://github.com/pypa/get-pip
ENV PYTHON_GET_PIP_URL https://github.com/pypa/get-pip/raw/8cc88aca7d9775fce279e8b84ef163cf1d3e8a2e/get-pip.py
ENV PYTHON_GET_PIP_SHA256 ffb67da2e976f48dd29714fc64812d1ac419eb7d48079737166dd95640d1debd

RUN set -ex; \
	\
	wget -O get-pip.py "$PYTHON_GET_PIP_URL"; \
	echo "$PYTHON_GET_PIP_SHA256 *get-pip.py" | sha256sum -c -; \
	\
	python get-pip.py \
		--disable-pip-version-check \
		--no-cache-dir \
		"pip==$PYTHON_PIP_VERSION" \
	; \
	pip --version; \
	\
	find /usr/local -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 -f get-pip.py

RUN pip3 install awscli --upgrade
RUN apk add --no-cache zip