Dockerfile

FROM buildpack-deps:buster

ARG firefox_ver=83.0

# 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
RUN apt-get upgrade -y
RUN apt-get install -y --no-install-recommends \
		libbluetooth-dev \
		tk-dev \
		uuid-dev \
		\
 && apt-get install -y --no-install-recommends --no-install-suggests \
            ca-certificates \
 && update-ca-certificates \
    \
 # Install tools for building
 && toolDeps=" \
        curl bzip2 \
    " \
 && apt-get install -y --no-install-recommends --no-install-suggests \
            $toolDeps \
	\
 # Install dependencies for Firefox
 && apt-get install -y --no-install-recommends --no-install-suggests \
            `apt-cache depends firefox-esr | awk '/Depends:/{print$2}'` \
            # additional 'firefox-esl' dependencies which is not in 'depends' list
            libxt6 \
 # Download and install Firefox
 && curl -fL -o /tmp/firefox.tar.bz2 \
         https://ftp.mozilla.org/pub/firefox/releases/${firefox_ver}/linux-x86_64/en-GB/firefox-${firefox_ver}.tar.bz2 \
 && tar -xjf /tmp/firefox.tar.bz2 -C /tmp/ \
 && mv /tmp/firefox /opt/firefox \
 && rm -rf /var/lib/apt/lists/*	

ENV GPG_KEY E3FF2839C048B25C084DEBE9B26995E310250568
ENV PYTHON_VERSION 3.8.6

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="$gnuArch" \
		--enable-loadable-sqlite-extensions \
		--enable-optimizations \
		--enable-option-checking=fatal \
		--enable-shared \
		--with-system-expat \
		--with-system-ffi \
		--without-ensurepip \
	&& make -j "$(nproc)" \
	&& 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 '{}' + \
	\
	&& ldconfig \
	\
	&& 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 20.3.1
# https://github.com/pypa/get-pip
ENV PYTHON_GET_PIP_URL https://github.com/pypa/get-pip/raw/91630a4867b1f93ba0a12aa81d0ec4ecc1e7eeb9/get-pip.py
ENV PYTHON_GET_PIP_SHA256 d48ae68f297cac54db17e4107b800faae0e5210131f9f386c30c0166bf8d81b7

RUN set -ex; \
	\
	wget -O get-pip.py "$PYTHON_GET_PIP_URL"; \
	echo "$PYTHON_GET_PIP_SHA256 *get-pip.py" | sha256sum --check --strict -; \
	\
	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

CMD ["python3"]