-

FROM alpine:3.3

# 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

# gpg: key F73C700D: public key "Larry Hastings <larry@hastings.org>" imported
ENV GPG_KEY 97FC712E4C024BBEA48A61ED3A5CA953F73C700D

ENV PYTHON_VERSION 3.5.1

# if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
ENV PYTHON_PIP_VERSION 8.1.2

RUN set -ex \
	&& apk add --no-cache --virtual .fetch-deps curl gnupg \
	&& curl -fSL "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz" -o python.tar.xz \
	&& curl -fSL "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz.asc" -o python.tar.xz.asc \
	&& export GNUPGHOME="$(mktemp -d)" \
	&& gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$GPG_KEY" \
	&& gpg --batch --verify python.tar.xz.asc python.tar.xz \
	&& rm -r "$GNUPGHOME" python.tar.xz.asc \
	&& mkdir -p /usr/src \
	&& tar -xJC /usr/src -f python.tar.xz \
	&& mv "/usr/src/Python-$PYTHON_VERSION" /usr/src/python \
	&& rm python.tar.xz \
	&& apk del .fetch-deps \
	\
	&& apk add --no-cache --virtual .build-deps  \
		bzip2-dev \
		gcc \
		libc-dev \
		linux-headers \
		make \
		ncurses-dev \
		openssl-dev \
		pax-utils \
		readline-dev \
		sqlite-dev \
		xz-dev \
		zlib-dev \
	&& cd /usr/src/python \
	&& ./configure --enable-shared --enable-unicode=ucs4 --with-pydebug \
	&& make -j$(getconf _NPROCESSORS_ONLN) CFLAGS="-g -fno-inline -fno-strict-aliasing" \
	&& make install \
	&& pip3 install --no-cache-dir --upgrade --ignore-installed pip==$PYTHON_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 '{}' + \
	&& runDeps="$( \
		scanelf --needed --nobanner --recursive /usr/local \
			| awk '{ gsub(/,/, "\nso:", $2); print "so:" $2 }' \
			| sort -u \
			| xargs -r apk info --installed \
			| sort -u \
	)" \
	&& apk add --virtual .python-rundeps $runDeps \
	&& apk del .build-deps \
	&& rm -rf ~/.cache

# make some useful symlinks that are expected to exist
RUN cd /usr/local/bin \
	&& ln -s easy_install-3.5 easy_install \
	&& ln -s idle3 idle \
	&& ln -s pydoc3 pydoc \
	&& ln -s python3 python \
	&& ln -s python3-config python-config

RUN echo "add-auto-load-safe-path /usr/src/python" > /root/.gdbinit

CMD ["python3"]