FROM buildpack-deps:%%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

# extra dependencies (over what buildpack-deps already includes)

RUN apt-get update && apt-get install -y --no-install-recommends \

# Python 3.4 on Stretch+ needs to use an older version of "libssl-dev" (these lines both get removed for every other combination)

libssl-dev \

tk-dev \

uuid-dev \

&& rm -rf /var/lib/apt/lists/*

ENV GPG_KEY %%PLACEHOLDER%%

ENV PYTHON_VERSION %%PLACEHOLDER%%

RUN set -ex \

\

&& 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 \

\

&& 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 \

\

&& 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 \

\

&& 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 %%PLACEHOLDER%%

RUN set -ex; \

\

wget -O get-pip.py 'https://bootstrap.pypa.io/get-pip.py'; \

\

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"]