steam-runtime.docker

# Arguments:
# beta             - set to select beta runtime (docker build --build-arg=beta=1 ...)
# arch             - set to select runtime architecture (docker build --build-arg=arch=i386 ...)
#                    Must have associated cloud iamge in build directory, default amd64
# extra_bootstrap  - Extra script file to include out of scripts/ and execute to bootstrap the container (out of /root).
#                    e.g. --build-arg=extra_bootstrap=bootstrap-custom.sh
# proxy            - optional argument for http/https proxy
FROM scratch
ARG arch=amd64
ARG beta
ARG arch
ARG extra_bootstrap
ARG proxy

##
## Docker setup, based on upsteam docker image's precise tweaks,
## see  https://github.com/tianon/docker-brew-ubuntu-core
## also https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap
##
ADD ubuntu-precise-core-cloudimg-${arch}-root.tar.gz /

RUN \
	set -xe; \
	if [ -n "${proxy}" ]; then \
		echo "configure proxy"; \
		echo "export http_proxy=${proxy}" >> /etc/bash.bashrc; \
		echo "export https_proxy=${proxy}" >> /etc/bash.bashrc; \
		echo "export ftp_proxy=${proxy}" >> /etc/bash.bashrc; \
		echo "Acquire::http::proxy \"${proxy}\";" > /etc/apt/apt.conf.d/01proxy; \
		echo "Acquire::https::proxy \"${proxy}\";" >> /etc/apt/apt.conf.d/01proxy; \
	fi; \
	if [ -n "${no_proxy}" ]; then \
		echo "export no_proxy=${no_proxy}" >> /etc/bash.bashrc; \
		oldIFS="$IFS"; \
		IFS=","; \
		for nope in ${no_proxy}; do \
			case "$nope" in \
				(.*) \
					;; \
				(*) \
					echo "Acquire::http::proxy::${nope} \"DIRECT\";" >> /etc/apt/apt.conf.d/01proxy; \
					echo "Acquire::https::proxy::${nope} \"DIRECT\";" >> /etc/apt/apt.conf.d/01proxy; \
					;; \
			esac; \
		done; \
		IFS="$oldIFS"; \
	fi

RUN set -xe \
	\
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L40-L48
	&& echo '#!/bin/sh' > /usr/sbin/policy-rc.d \
	&& echo 'exit 101' >> /usr/sbin/policy-rc.d \
	&& chmod +x /usr/sbin/policy-rc.d \
	\
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L54-L56
	&& dpkg-divert --local --rename --add /sbin/initctl \
	&& cp -a /usr/sbin/policy-rc.d /sbin/initctl \
	&& sed -i 's/^exit.*/exit 0/' /sbin/initctl \
	\
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L71-L78
	&& echo 'force-unsafe-io' > /etc/dpkg/dpkg.cfg.d/docker-apt-speedup \
	\
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L85-L105
	&& echo 'DPkg::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' > /etc/apt/apt.conf.d/docker-clean \
	&& echo 'APT::Update::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' >> /etc/apt/apt.conf.d/docker-clean \
	&& echo 'Dir::Cache::pkgcache ""; Dir::Cache::srcpkgcache "";' >> /etc/apt/apt.conf.d/docker-clean \
	\
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L109-L115
	&& echo 'Acquire::Languages "none";' > /etc/apt/apt.conf.d/docker-no-languages \
	\
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L118-L130
	&& echo 'Acquire::GzipIndexes "true"; Acquire::CompressionTypes::Order:: "gz";' > /etc/apt/apt.conf.d/docker-gzip-indexes \
	\
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L134-L151
	&& echo 'Apt::AutoRemove::SuggestsImportant "false";' > /etc/apt/apt.conf.d/docker-autoremove-suggests

# enable the universe
RUN sed -i 's/^#\s*\(deb.*universe\)$/\1/g' /etc/apt/sources.list

# make systemd-detect-virt return "docker"
# See: https://github.com/systemd/systemd/blob/aa0c34279ee40bce2f9681b496922dedbadfca19/src/basic/virt.c#L434
RUN mkdir -p /run/systemd && echo 'docker' > /run/systemd/container

# Allow resolvconf to be installed without error
RUN apt-get -y install debconf-utils \
	&& echo "resolvconf resolvconf/linkify-resolvconf boolean false" | debconf-set-selections \
	&& apt-get -y install resolvconf

# Prevent failure during installation of 'time'
RUN apt-get -y install install-info

##
## Steam Runtime specific setup
##

COPY scripts/bootstrap-runtime.sh /root/
RUN /root/bootstrap-runtime.sh --docker ${beta:+--beta}

# The default-value expansion means we'll copy bootstrap-runtime.sh over twice if extra_bootstrap isn't set, which is a
# silly way to conditionally copy a second file.
COPY ${extra_bootstrap:-scripts/bootstrap-runtime.sh} /root/bootstrap-extra.sh
RUN [ "x${extra_bootstrap}" = 'x' ] || "/root/bootstrap-extra.sh"

COPY write-manifest /root/
RUN /root/write-manifest /

CMD [ "/bin/bash", "--login" ]