Dockerfile

FROM debian:buster-slim

SHELL ["/bin/bash", "-Eeuo", "pipefail", "-xc"]

RUN apt-get update; \
	apt-get install -y --no-install-recommends \
		bash-completion \
		bc \
		bison \
		ca-certificates \
		cpio \
		flex \
		gcc \
		git \
		gnupg dirmngr \
		golang-go \
		kmod \
		libc6-dev \
		libelf-dev \
		libssl-dev \
		make \
		p7zip-full \
		patch \
		rsync \
		squashfs-tools \
		wget \
		xorriso \
		xz-utils \
	; \
	rm -rf /var/lib/apt/lists/*

# cleaner wget output
RUN echo 'progress = dot:giga' >> ~/.wgetrc; \
# color prompt (better debugging/devel)
	cp /etc/skel/.bashrc ~/

WORKDIR /rootfs

# updated via "update.sh"
ENV TCL_MIRRORS http://distro.ibiblio.org/tinycorelinux http://repo.tinycorelinux.net
ENV TCL_MAJOR 12.x
ENV TCL_VERSION 12.0

# http://distro.ibiblio.org/tinycorelinux/8.x/x86_64/archive/8.2.1/distribution_files/rootfs64.gz.md5.txt
# updated via "update.sh"
ENV TCL_ROOTFS="rootfs64.gz" TCL_ROOTFS_MD5="c83daf94a7095af711bc8a3e6968b5a7"

COPY files/tce-load.patch files/udhcpc.patch /tcl-patches/

RUN for mirror in $TCL_MIRRORS; do \
		if \
			{ \
				wget -O /rootfs.gz "$mirror/$TCL_MAJOR/x86_64/archive/$TCL_VERSION/distribution_files/$TCL_ROOTFS" \
# 9.x doesn't seem to use ".../archive/X.Y.Z/..." in the same way as 8.x :(
					|| wget -O /rootfs.gz "$mirror/$TCL_MAJOR/x86_64/release/distribution_files/$TCL_ROOTFS" \
			; } && echo "$TCL_ROOTFS_MD5 */rootfs.gz" | md5sum -c - \
		; then \
			break; \
		fi; \
	done; \
	echo "$TCL_ROOTFS_MD5 */rootfs.gz" | md5sum -c -; \
	zcat /rootfs.gz | cpio \
		--extract \
		--make-directories \
		--no-absolute-filenames \
	; \
	rm /rootfs.gz; \
	\
	for patch in /tcl-patches/*.patch; do \
		patch \
			--input "$patch" \
			--strip 1 \
			--verbose \
		; \
	done; \
	\
	{ \
		echo '# https://1.1.1.1/'; \
		echo 'nameserver 1.1.1.1'; \
		echo 'nameserver 1.0.0.1'; \
		echo; \
		echo '# https://developers.google.com/speed/public-dns/'; \
		echo 'nameserver 8.8.8.8'; \
		echo 'nameserver 8.8.4.4'; \
	} > etc/resolv.conf; \
	cp etc/resolv.conf etc/resolv.conf.b2d; \
	{ \
		echo '#!/usr/bin/env bash'; \
		echo 'set -Eeuo pipefail'; \
		echo "cd '$PWD'"; \
		echo 'cp -T etc/resolv.conf etc/resolv.conf.bak'; \
		echo 'cp -T /etc/resolv.conf etc/resolv.conf'; \
		echo 'cp -T /proc/cpuinfo proc/cpuinfo 2>/dev/null || :'; \
		echo 'trap "mv -T etc/resolv.conf.bak etc/resolv.conf || :; rm proc/cpuinfo 2>/dev/null || :" EXIT'; \
		echo 'env -i PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" TERM="$TERM" chroot '"'$PWD'"' "$@"'; \
	} > /usr/local/bin/tcl-chroot; \
	chmod +x /usr/local/bin/tcl-chroot

# add new "docker" user (and replace "tc" user usage with "docker")
RUN tcl-chroot adduser \
		-h /home/docker \
		-g 'Docker' \
		-s /bin/sh \
		-G staff \
		-D \
		-u 1000 \
		docker \
	; \
	echo 'docker:tcuser' | tcl-chroot chpasswd; \
	echo 'docker ALL = NOPASSWD: ALL' >> etc/sudoers; \
	sed -i 's/USER="tc"/USER="docker"/g' etc/init.d/tc-* etc/init.d/services/*

# https://github.com/tatsushid/docker-tinycore/blob/017b258a08a41399f65250c9865a163226c8e0bf/8.2/x86_64/Dockerfile
RUN mkdir -p proc; \
	touch proc/cmdline; \
	mkdir -p tmp/tce/optional usr/local/tce.installed/optional; \
	chown -R root:staff tmp/tce usr/local/tce.installed; \
	chmod -R g+w tmp/tce; \
	ln -sT ../../tmp/tce etc/sysconfig/tcedir; \
	echo -n docker > etc/sysconfig/tcuser; \
	tcl-chroot sh -c '. /etc/init.d/tc-functions && setupHome'

# as of squashfs-tools 4.4, TCL's unsquashfs is broken... (fails to unsquashfs *many* core tcz files)
# https://github.com/plougher/squashfs-tools/releases
ENV SQUASHFS_VERSION 4.4
RUN wget -O squashfs.tgz "https://github.com/plougher/squashfs-tools/archive/$SQUASHFS_VERSION.tar.gz"; \
	tar --directory=/usr/src --extract --file=squashfs.tgz; \
	make -C "/usr/src/squashfs-tools-$SQUASHFS_VERSION/squashfs-tools" \
		-j "$(nproc)" \
# https://github.com/plougher/squashfs-tools/blob/4.4/squashfs-tools/Makefile#L1
		GZIP_SUPPORT=1 \
#		XZ_SUPPORT=1 \
#		LZO_SUPPORT=1 \
#		LZ4_SUPPORT=1 \
#		ZSTD_SUPPORT=1 \
		EXTRA_CFLAGS='-static' \
		EXTRA_LDFLAGS='-static' \
		INSTALL_DIR="$PWD/usr/local/bin" \
		install \
	; \
	tcl-chroot unsquashfs -v || :

RUN { \
		echo '#!/bin/bash -Eeux'; \
		echo 'tcl-chroot su -c "tce-load -wicl \"\$@\"" docker -- - "$@"'; \
	} > /usr/local/bin/tcl-tce-load; \
	chmod +x /usr/local/bin/tcl-tce-load

RUN tcl-tce-load bash; \
	tcl-chroot bash --version; \
# delete all the TCL user-specific profile/rc files -- they have odd settings like auto-login from interactive root directly to "tcuser"
# (and the bash-provided defaults are reasonably sane)
	rm -vf \
		home/docker/.ashrc \
		home/docker/.bashrc \
		home/docker/.profile \
		root/.ashrc \
		root/.bashrc \
		root/.profile \
	; \
	echo 'source /etc/profile' > home/docker/.profile; \
	echo 'source /etc/profile' > root/.profile; \
# swap "docker" (and "root") user shell from /bin/sh to /bin/bash now that it exists
	sed -ri '/^(docker|root):/ s!:[^:]*$!:/bin/bash!' etc/passwd; \
	grep -E '^root:' etc/passwd | grep bash; \
	grep -E '^docker:' etc/passwd | grep bash; \
# /etc/profile has a minor root bug where it uses "\#" in PS1 instead of "\$" (so we get a counter in our prompt instead of a "#")
# but also, does not use \[ and \] for escape sequences, so Bash readline gets confused, so let's replace it outright with something perty
	grep '\\#' etc/profile; \
	echo 'PS1='"'"'\[\e[1;32m\]\u@\h\[\e[0m\]:\[\e[1;34m\]\w\[\e[0m\]\$ '"'"'' > etc/profile.d/boot2docker-ps1.sh; \
	source etc/profile.d/boot2docker-ps1.sh; \
	[ "$PS1" = '\[\e[1;32m\]\u@\h\[\e[0m\]:\[\e[1;34m\]\w\[\e[0m\]\$ ' ]

# https://www.kernel.org/category/signatures.html#important-fingerprints
ENV LINUX_GPG_KEYS \
# Linus Torvalds
		ABAF11C65A2970B130ABE3C479BE3E4300411886 \
# Greg Kroah-Hartman
		647F28654894E3BD457199BE38DBBDC86092693E

# updated via "update.sh"
ENV LINUX_VERSION 5.10.53

RUN wget -O /linux.tar.xz "https://cdn.kernel.org/pub/linux/kernel/v${LINUX_VERSION%%.*}.x/linux-${LINUX_VERSION}.tar.xz"; \
	wget -O /linux.tar.asc "https://cdn.kernel.org/pub/linux/kernel/v${LINUX_VERSION%%.*}.x/linux-${LINUX_VERSION}.tar.sign"; \
	\
# decompress (signature is for the decompressed file)
	xz --decompress /linux.tar.xz; \
	[ -f /linux.tar ] && [ ! -f /linux.tar.xz ]; \
	\
# verify
	export GNUPGHOME="$(mktemp -d)"; \
	for key in $LINUX_GPG_KEYS; do \
		for mirror in \
			ha.pool.sks-keyservers.net \
			pgp.mit.edu \
			hkp://p80.pool.sks-keyservers.net:80 \
			ipv4.pool.sks-keyservers.net \
			keyserver.ubuntu.com \
			hkp://keyserver.ubuntu.com:80 \
		; do \
			if gpg --batch --verbose --keyserver "$mirror" --keyserver-options timeout=5 --recv-keys "$key"; then \
				break; \
			fi; \
		done; \
		gpg --batch --fingerprint "$key"; \
	done; \
	gpg --batch --verify /linux.tar.asc /linux.tar; \
	gpgconf --kill all; \
	rm -rf "$GNUPGHOME"; \
	\
# extract
	tar --extract --file /linux.tar --directory /usr/src; \
	rm /linux.tar /linux.tar.asc; \
	ln -sT "linux-$LINUX_VERSION" /usr/src/linux; \
	[ -d /usr/src/linux ]

RUN { \
		echo '#!/usr/bin/env bash'; \
		echo 'set -Eeuo pipefail'; \
		echo 'while [ "$#" -gt 0 ]; do'; \
		echo 'conf="${1%%=*}"; shift'; \
		echo 'conf="${conf#CONFIG_}"'; \
# https://www.kernel.org/doc/Documentation/kbuild/kconfig-language.txt
# TODO somehow capture "if" directives (https://github.com/torvalds/linux/blob/52e60b754438f34d23348698534e9ca63cd751d7/drivers/message/fusion/Kconfig#L12) since they're dependency related (can't set "CONFIG_FUSION_SAS" without first setting "CONFIG_FUSION")
		echo 'find /usr/src/linux/ \
			-name Kconfig \
			-exec awk -v conf="$conf" '"'"' \
				$1 ~ /^(menu)?config$/ && $2 == conf { \
					yes = 1; \
					printf "-- %s:%s --\n", FILENAME, FNR; \
					print; \
					next; \
				} \
				$1 ~ /^(end)?((menu)?config|choice|comment|menu|if|source)$/ { yes = 0; next } \
# TODO parse help text properly (indentation-based) to avoid false positives when scraping deps
				yes { print; next } \
			'"'"' "{}" + \
		'; \
		echo 'done'; \
	} > /usr/local/bin/linux-kconfig-info; \
	chmod +x /usr/local/bin/linux-kconfig-info; \
	linux-kconfig-info CGROUPS

COPY files/kernel-config.d /kernel-config.d

RUN setConfs="$(grep -vEh '^[#-]' /kernel-config.d/* | sort -u)"; \
	unsetConfs="$(sed -n 's/^-//p' /kernel-config.d/* | sort -u)"; \
	IFS=$'\n'; \
	setConfs=( $setConfs ); \
	unsetConfs=( $unsetConfs ); \
	unset IFS; \
	\
# https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg2140886.html
	make -C /usr/src/linux \
		defconfig \
		kvm_guest.config \
		xen.config \
		> /dev/null; \
	\
	( \
		set +x; \
		for conf in "${unsetConfs[@]}"; do \
			sed -i -e "s!^$conf=.*\$!# $conf is not set!" /usr/src/linux/.config; \
		done; \
		for confV in "${setConfs[@]}"; do \
			conf="${confV%%=*}"; \
			sed -ri -e "s!^($conf=.*|# $conf is not set)\$!$confV!" /usr/src/linux/.config; \
			if ! grep -q "^$confV\$" /usr/src/linux/.config; then \
				echo "$confV" >> /usr/src/linux/.config; \
			fi; \
		done; \
	); \
	make -C /usr/src/linux olddefconfig; \
	set +x; \
	ret=; \
	for conf in "${unsetConfs[@]}"; do \
		if grep "^$conf=" /usr/src/linux/.config; then \
			echo "$conf is set!"; \
			ret=1; \
		fi; \
	done; \
	for confV in "${setConfs[@]}"; do \
		if ! grep -q "^$confV\$" /usr/src/linux/.config; then \
			kconfig="$(linux-kconfig-info "$confV")"; \
			echo >&2; \
			echo >&2 "'$confV' is not set:"; \
			echo >&2; \
			echo >&2 "$kconfig"; \
			echo >&2; \
			for dep in $(awk '$1 == "depends" && $2 == "on" { $1 = ""; $2 = ""; gsub(/[^a-zA-Z0-9_-]+/, " "); print }' <<<"$kconfig"); do \
				grep >&2 -E "^CONFIG_$dep=|^# CONFIG_$dep is not set$" /usr/src/linux/.config || :; \
			done; \
			echo >&2; \
			ret=1; \
		fi; \
	done; \
	[ -z "$ret" ] || exit "$ret"

RUN make -C /usr/src/linux -j "$(nproc)" bzImage modules; \
	make -C /usr/src/linux INSTALL_MOD_PATH="$PWD" modules_install
RUN mkdir -p /tmp/iso/boot; \
	cp -vLT /usr/src/linux/arch/x86_64/boot/bzImage /tmp/iso/boot/vmlinuz

RUN tcl-tce-load \
		acpid \
		bash-completion \
		ca-certificates \
		curl \
		e2fsprogs \
		git \
		iproute2 \
		iptables \
		ncursesw-terminfo \
		nfs-utils \
		openssh \
		openssl-1.1.1 \
		parted \
		procps-ng \
		rsync \
		tar \
		util-linux \
		xz

# bash-completion puts auto-load in /usr/local/etc/profile.d instead of /etc/profile.d
# (this one-liner is the same as the loop at the end of /etc/profile with an adjusted search path)
RUN echo 'for i in /usr/local/etc/profile.d/*.sh ; do if [ -r "$i" ]; then . $i; fi; done' > etc/profile.d/usr-local-etc-profile-d.sh; \
# Docker expects to find certs in /etc/ssl
	ln -svT ../usr/local/etc/ssl etc/ssl; \
# make sure the Docker group exists and we're part of it
	tcl-chroot sh -eux -c 'addgroup -S docker && addgroup docker docker'

# install kernel headers so we can use them for building xen-utils, etc
RUN make -C /usr/src/linux INSTALL_HDR_PATH=/usr/local headers_install

# http://download.virtualbox.org/virtualbox/
# updated via "update.sh"
ENV VBOX_VERSION 6.1.24
# https://www.virtualbox.org/download/hashes/$VBOX_VERSION/SHA256SUMS
ENV VBOX_SHA256 57303e8b4d2e411cdd99dbc429eb32ea48998d2674264fc8dd75b89750011e59
# (VBoxGuestAdditions_X.Y.Z.iso SHA256, for verification)

RUN wget -O /vbox.iso "https://download.virtualbox.org/virtualbox/$VBOX_VERSION/VBoxGuestAdditions_$VBOX_VERSION.iso"; \
	echo "$VBOX_SHA256 */vbox.iso" | sha256sum -c -; \
	7z x -o/ /vbox.iso VBoxLinuxAdditions.run; \
	rm /vbox.iso; \
	sh /VBoxLinuxAdditions.run --noexec --target /usr/src/vbox; \
	mkdir /usr/src/vbox/amd64; \
	7z x -so /usr/src/vbox/VBoxGuestAdditions-amd64.tar.bz2 | tar --extract --directory /usr/src/vbox/amd64; \
	rm /usr/src/vbox/VBoxGuestAdditions-*.tar.bz2; \
	ln -sT "vboxguest-$VBOX_VERSION" /usr/src/vbox/amd64/src/vboxguest
RUN make -C /usr/src/vbox/amd64/src/vboxguest -j "$(nproc)" \
		KERN_DIR='/usr/src/linux' \
		KERN_VER="$(< /usr/src/linux/include/config/kernel.release)" \
		vboxguest vboxsf \
	; \
	cp -v /usr/src/vbox/amd64/src/vboxguest/*.ko lib/modules/*/; \
# create hacky symlink so these binaries can work as-is
	ln -sT lib lib64; \
	cp -v /usr/src/vbox/amd64/other/mount.vboxsf /usr/src/vbox/amd64/sbin/VBoxService sbin/; \
	cp -v /usr/src/vbox/amd64/bin/VBoxControl bin/

# TCL includes VMware's open-vm-tools 10.2.0.1608+ (no reason to compile that ourselves)
RUN tcl-tce-load open-vm-tools; \
	tcl-chroot vmhgfs-fuse --version; \
	tcl-chroot which vmtoolsd

ENV PARALLELS_VERSION 16.5.0-49183

RUN wget -O /parallels.tgz "https://download.parallels.com/desktop/v${PARALLELS_VERSION%%.*}/$PARALLELS_VERSION/ParallelsTools-$PARALLELS_VERSION-boot2docker.tar.gz"; \
	mkdir /usr/src/parallels; \
	tar --extract --file /parallels.tgz --directory /usr/src/parallels --strip-components 1; \
	rm /parallels.tgz
RUN cp -vr /usr/src/parallels/tools/* ./; \
	make -C /usr/src/parallels/kmods -f Makefile.kmods -j "$(nproc)" compile \
		SRC='/usr/src/linux' \
		KERNEL_DIR='/usr/src/linux' \
		KVER="$(< /usr/src/linux/include/config/kernel.release)" \
		PRL_FREEZE_SKIP=1 \
	; \
	find /usr/src/parallels/kmods -name '*.ko' -exec cp -v '{}' lib/modules/*/ ';'; \
	tcl-chroot prltoolsd -V

# https://github.com/xenserver/xe-guest-utilities/tags
# updated via "update.sh"
ENV XEN_VERSION 7.30.0

RUN wget -O /xen.tgz "https://github.com/xenserver/xe-guest-utilities/archive/v$XEN_VERSION.tar.gz"; \
	mkdir /usr/src/xen; \
	tar --extract --file /xen.tgz --directory /usr/src/xen --strip-components 1; \
	rm /xen.tgz
RUN cd /usr/src/xen; \
	GOPATH='/usr/src/xen/GOPATH' go get
RUN GOPATH='/usr/src/xen/GOPATH' make -C /usr/src/xen -j "$(nproc)" PRODUCT_VERSION="$XEN_VERSION" RELEASE='boot2docker'; \
	tar --extract --file "/usr/src/xen/build/dist/xe-guest-utilities_$XEN_VERSION-boot2docker_x86_64.tgz"; \
	tcl-chroot xenstore || [ "$?" = 1 ]

# Hyper-V KVP Daemon
RUN make -C /usr/src/linux/tools/hv hv_kvp_daemon; \
	cp /usr/src/linux/tools/hv/hv_kvp_daemon usr/local/sbin/; \
	tcl-chroot hv_kvp_daemon --help || [ "$?" = 1 ]

# scan all built modules for kernel loading
RUN tcl-chroot depmod "$(< /usr/src/linux/include/config/kernel.release)"

# https://github.com/tianon/cgroupfs-mount/releases
ENV CGROUPFS_MOUNT_VERSION 1.4

RUN wget -O usr/local/sbin/cgroupfs-mount "https://github.com/tianon/cgroupfs-mount/raw/${CGROUPFS_MOUNT_VERSION}/cgroupfs-mount"; \
	chmod +x usr/local/sbin/cgroupfs-mount; \
	tcl-chroot cgroupfs-mount

ENV DOCKER_VERSION 20.10.7

# Get the Docker binaries with version that matches our boot2docker version.
RUN DOCKER_CHANNEL='stable'; \
	case "$DOCKER_VERSION" in \
# all the pre-releases go in the "test" channel
		*-rc* | *-beta* | *-tp* ) DOCKER_CHANNEL='test' ;; \
	esac; \
	\
	wget -O /docker.tgz "https://download.docker.com/linux/static/$DOCKER_CHANNEL/x86_64/docker-$DOCKER_VERSION.tgz"; \
	tar -zxvf /docker.tgz -C "usr/local/bin" --strip-components=1; \
	rm /docker.tgz; \
	\
# download bash-completion too
	wget -O usr/local/share/bash-completion/completions/docker "https://github.com/docker/cli/raw/v${DOCKER_VERSION}/contrib/completion/bash/docker"; \
	\
	for binary in \
		containerd \
		ctr \
		docker \
		docker-init \
		dockerd \
		runc \
	; do \
		chroot . "$binary" --version; \
	done

# set up docker
RUN mkdir -p etc/docker; \
	{ \
		echo '{'; \
		echo '    "features": {'; \
		echo '        "buildkit": true'; \
		echo '    }'; \
		echo '}'; \
	} > etc/docker/daemon.json

# set up a few branding bits
RUN { \
		echo 'NAME=Boot2Docker'; \
		echo "VERSION=$DOCKER_VERSION"; \
		echo 'ID=boot2docker'; \
		echo 'ID_LIKE=tcl'; \
		echo "VERSION_ID=$DOCKER_VERSION"; \
		echo "PRETTY_NAME=\"Boot2Docker $DOCKER_VERSION (TCL $TCL_VERSION)\""; \
		echo 'ANSI_COLOR="1;34"'; \
		echo 'HOME_URL="https://github.com/silver886/boot2docker"'; \
		echo 'SUPPORT_URL="https://blog.docker.com/2016/11/introducing-docker-community-directory-docker-community-slack/"'; \
		echo 'BUG_REPORT_URL="https://github.com/silver886/boot2docker/issues"'; \
	} > etc/os-release; \
	sed -i 's/HOSTNAME="box"/HOSTNAME="boot2docker"/g' usr/bin/sethostname; \
	tcl-chroot sethostname; \
	[ "$(< etc/hostname)" = 'boot2docker' ]; \
	for num in 0 1 2 3; do \
		echo "server $num.boot2docker.pool.ntp.org"; \
	done > etc/ntp.conf; \
	rm -v etc/sysconfig/ntpserver

COPY files/forgiving-getty files/shutdown ./usr/local/sbin/

# getty/inittab setup
RUN awk -F: ' \
		$1 == "tty1" { \
			print "tty1::respawn:/usr/local/sbin/forgiving-getty tty1"; \
			print "ttyS0::respawn:/usr/local/sbin/forgiving-getty ttyS0"; \
			next; \
		} \
		$1 ~ /^#?tty/ { next } \
		{ print } \
	' etc/inittab > etc/inittab.new; \
	mv etc/inittab.new etc/inittab; \
	grep forgiving-getty etc/inittab; \
# /sbin/autologin likes to invoke getty directly, so we skip that noise (especially since we want to always autologin)
# (and getty's "-l" argument cannot accept anything but a single command to "exec" directly -- no args)
# (and getty's "-n" argument to autologin doesn't seem to work properly)
	{ \
		echo '#!/bin/sh'; \
		echo 'user="$(cat /etc/sysconfig/tcuser 2>/dev/null)"'; \
		echo 'exec login -f "${user:-docker}"'; \
	} > usr/local/sbin/autologin; \
	chmod +x usr/local/sbin/autologin

# ssh config prep
RUN [ ! -f usr/local/etc/sshd_config ]; \
	sed -r \
		-e 's/^#(UseDNS[[:space:]])/\1/' \
		-e 's/^#(PermitUserEnvironment)[[:space:]].*$/\1 yes/' \
		usr/local/etc/ssh/sshd_config.orig \
		> usr/local/etc/ssh/sshd_config; \
	grep '^UseDNS no$' usr/local/etc/ssh/sshd_config; \
# "This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin
# (and there are several important binaries in /usr/local/sbin that "docker-machine" needs to invoke like "ip" and "iptables")
	grep '^PermitUserEnvironment yes$' usr/local/etc/ssh/sshd_config; \
	mkdir -p home/docker/.ssh; \
	echo 'PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin' > home/docker/.ssh/environment; \
# acpid prep (looks in the wrong path for /etc/acpi)
	ln -sT ../usr/local/etc/acpi etc/acpi; \
	[ -z "$(ls -A etc/acpi/events)" ]; \
	{ echo 'event=button/power'; echo 'action=/usr/bin/env poweroff'; } > etc/acpi/events/power; \
# explicit UTC timezone (especially for container bind-mounting)
	echo 'UTC' > etc/timezone; \
	cp -vL /usr/share/zoneinfo/UTC etc/localtime; \
# "dockremap" user/group so "--userns-remap=default" works out-of-the-box
	tcl-chroot addgroup -S dockremap; \
	tcl-chroot adduser -S -G dockremap dockremap; \
	echo 'dockremap:165536:65536' | tee etc/subuid | tee etc/subgid

RUN savedAptMark="$(apt-mark showmanual)"; \
	apt-get update; \
	apt-get install -y --no-install-recommends \
		isolinux \
		syslinux-common \
	; \
	rm -rf /var/lib/apt/lists/*; \
	mkdir -p /tmp/iso/isolinux; \
	cp -v \
		/usr/lib/ISOLINUX/isolinux.bin \
		/usr/lib/syslinux/modules/bios/ldlinux.c32 \
		/usr/lib/syslinux/modules/bios/libutil.c32 \
		/usr/lib/syslinux/modules/bios/menu.c32 \
		/tmp/iso/isolinux/ \
	; \
	cp -v /usr/lib/ISOLINUX/isohdpfx.bin /tmp/; \
	apt-mark auto '.*' > /dev/null; \
	apt-mark manual $savedAptMark; \
	apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false
COPY files/isolinux.cfg /tmp/iso/isolinux/

COPY files/init.d/* ./etc/init.d/
COPY files/bootsync.sh ./opt/

# temporary boot debugging aid
#RUN sed -i '2i set -x' etc/init.d/tc-config

COPY files/make-b2d-iso.sh /usr/local/bin/
RUN time make-b2d-iso.sh; \
	du -hs /tmp/boot2docker.iso

CMD ["sh", "-c", "[ -t 1 ] && exec bash || exec cat /tmp/boot2docker.iso"]