added systemd and openrc containers

openrc/Dockerfile.alpine

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+FROM docker.io/alpine
+
+RUN apk add openrc
+RUN mkdir -p /run/openrc && touch /run/openrc/softlevel
+RUN sed -i 's/VSERVER/DOCKER/Ig' /lib/rc/sh/init.sh
+
+# configured /etc/rc.conf for docker
+RUN sed -i '/getty/d' /etc/inittab
+
+COPY openrc.sh /openrc.sh
+ENTRYPOINT ["/openrc.sh"]

openrc/README.md

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+# Credit
+
+https://github.com/robertdebock/docker-alpine-openrc/tree/master

openrc/openrc.sh

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+#!/bin/ash
+openrc default
+exec "$@"

openrc/test-openrc.sh

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+#!/bin/sh
+dir=$(dirname -- "$( readlink -f -- "$0"; )";)
+dockerfile="Dockerfile.alpine"
+set -ex
+echo "=== Testing ${dockerfile} ==="
+iid=$(docker build -q -f ${dir}/${dockerfile} ${dir})
+docker run -t --rm --privileged $iid ash -c "rc-status && printf 'OpenRC running!\n'"
+docker image rm $iid

systemd/Dockerfile.archlinux

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+FROM docker.io/heywoodlh/archlinux:latest
+RUN pacman -Sy --noconfirm systemd systemd-sysvcompat
+COPY systemd.sh /docker-entrypoint.sh
+ENTRYPOINT ["/docker-entrypoint.sh"]

systemd/Dockerfile.centos

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+FROM docker.io/centos:latest
+COPY systemd.sh /docker-entrypoint.sh
+ENTRYPOINT ["/docker-entrypoint.sh"]

systemd/Dockerfile.debian

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+FROM debian:latest
+RUN apt-get update && \
+  apt-get install -y --no-install-recommends \
+  systemd systemd-sysv dbus dbus-user-session
+COPY systemd.sh /docker-entrypoint.sh
+ENTRYPOINT ["/docker-entrypoint.sh"]

systemd/README.md

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+Container images running systemd for testing
+
+# Credit
+
+https://github.com/AkihiroSuda/containerized-systemd

systemd/systemd.sh

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+#!/bin/bash
+set -e
+container=docker
+export container
+
+if [ $# -eq 0 ]; then
+	echo >&2 'ERROR: No command specified. You probably want to run `journalctl -f`, or maybe `bash`?'
+	exit 1
+fi
+
+if [ ! -t 0 ]; then
+	echo >&2 'ERROR: TTY needs to be enabled (`docker run -t ...`).'
+	exit 1
+fi
+
+env >/etc/docker-entrypoint-env
+
+cat >/etc/systemd/system/docker-entrypoint.target <<EOF
+[Unit]
+Description=the target for docker-entrypoint.service
+Requires=docker-entrypoint.service systemd-logind.service systemd-user-sessions.service
+EOF
+
+quoted_args="$(printf " %q" "${@}")"
+echo "${quoted_args}" >/etc/docker-entrypoint-cmd
+
+cat >/etc/systemd/system/docker-entrypoint.service <<EOF
+[Unit]
+Description=docker-entrypoint.service
+
+[Service]
+ExecStart=/bin/bash -exc "source /etc/docker-entrypoint-cmd"
+# EXIT_STATUS is either an exit code integer or a signal name string, see systemd.exec(5)
+ExecStopPost=/bin/bash -ec "if echo \${EXIT_STATUS} | grep [A-Z] > /dev/null; then echo >&2 \"got signal \${EXIT_STATUS}\"; systemctl exit \$(( 128 + \$( kill -l \${EXIT_STATUS} ) )); else systemctl exit \${EXIT_STATUS}; fi"
+StandardInput=tty-force
+StandardOutput=inherit
+StandardError=inherit
+WorkingDirectory=$(pwd)
+EnvironmentFile=/etc/docker-entrypoint-env
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+systemctl mask systemd-firstboot.service systemd-udevd.service systemd-modules-load.service
+systemctl unmask systemd-logind
+systemctl enable docker-entrypoint.service
+
+systemd=
+if [ -x /lib/systemd/systemd ]; then
+	systemd=/lib/systemd/systemd
+elif [ -x /usr/lib/systemd/systemd ]; then
+	systemd=/usr/lib/systemd/systemd
+elif [ -x /sbin/init ]; then
+	systemd=/sbin/init
+else
+	echo >&2 'ERROR: systemd is not installed'
+	exit 1
+fi
+systemd_args="--show-status=false --unit=docker-entrypoint.target"
+echo "$0: starting $systemd $systemd_args"
+exec $systemd $systemd_args

systemd/test-systemd.sh

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+#!/bin/bash
+dir=$(dirname -- "$( readlink -f -- "$0"; )";)
+dockerfiles=("Dockerfile.centos" "Dockerfile.debian")
+
+set -ex
+for dockerfile in "${dockerfiles[@]}"; do
+	echo "=== Testing ${dockerfile} ==="
+	iid=$(docker build -q -f ${dir}/${dockerfile} ${dir})
+	# NOTE: old version of systemd doesn't wait for `systemctl is-system-running --wait`, so we have `until` loop here.
+	docker run -t --rm --privileged $iid sh -exc "until systemctl is-system-running --wait; do sleep 1; done; systemctl status --no-pager"
+	docker image rm $iid
+done