Dockerfile-slim.template

FROM debian:%%PLACEHOLDER%%

# 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 apt-get update && apt-get install -y --no-install-recommends \
		ca-certificates \
		libexpat1 \
		libffi6 \
		libgdbm3 \
		libreadline7 \
		libsqlite3-0 \
		libssl1.1 \
	&& rm -rf /var/lib/apt/lists/*

ENV GPG_KEY %%PLACEHOLDER%%
ENV PYTHON_VERSION %%PLACEHOLDER%%

RUN set -ex \
	&& buildDeps=" \
		dpkg-dev \
		gcc \
		libbz2-dev \
		libc6-dev \
		libexpat1-dev \
		libffi-dev \
		libgdbm-dev \
		liblzma-dev \
		libncursesw5-dev \
		libreadline-dev \
		libsqlite3-dev \
		libssl-dev \
		make \
		tcl-dev \
		tk-dev \
		wget \
		xz-utils \
		zlib1g-dev \
# as of Stretch, "gpg" is no longer included by default
		$(command -v gpg > /dev/null || echo 'gnupg dirmngr') \
	" \
	&& apt-get update && apt-get install -y $buildDeps --no-install-recommends && rm -rf /var/lib/apt/lists/* \
	\
	&& wget -O python.tar.xz "https://www.python.org/ftp/python/${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)"; \
	for server in \
		ha.pool.sks-keyservers.net \
		hkp://keyserver.ubuntu.com:80 \
		hkp://p80.pool.sks-keyservers.net:80 \
		pgp.mit.edu \
	; do \
		echo "Fetching GPG key $GPG_KEY from $server"; \
		gpg --keyserver "$server" --keyserver-options timeout=10 --recv-keys "$GPG_KEY" && found=yes && break; \
	done; \
	test -z "$found" && echo >&2 "error: failed to fetch GPG key $GPG_KEY" && exit 1; \
	gpg --batch --verify python.tar.xz.asc python.tar.xz \
	&& rm -rf "$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 \
	\
	&& cd /usr/src/python \
	&& gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
	&& ./configure \
		--build="$gnuArch" \
		--enable-loadable-sqlite-extensions \
		--enable-shared \
		--with-system-expat \
		--with-system-ffi \
		--without-ensurepip \
	&& make -j "$(nproc)" \
	&& make install \
	&& ldconfig \
	\
	&& apt-get purge -y --auto-remove $buildDeps \
	\
	&& find /usr/local -depth \
		\( \
			\( -type d -a \( -name test -o -name tests \) \) \
			-o \
			\( -type f -a \( -name '*.pyc' -o -name '*.pyo' \) \) \
		\) -exec rm -rf '{}' + \
	&& rm -rf /usr/src/python

# 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 %%PLACEHOLDER%%

RUN set -ex; \
	\
	apt-get update; \
	apt-get install -y --no-install-recommends wget; \
	rm -rf /var/lib/apt/lists/*; \
	\
	wget -O get-pip.py 'https://bootstrap.pypa.io/get-pip.py'; \
	\
	apt-get purge -y --auto-remove wget; \
	\
	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 \
			\( -type f -a \( -name '*.pyc' -o -name '*.pyo' \) \) \
		\) -exec rm -rf '{}' +; \
	rm -f get-pip.py

CMD ["python3"]