#!/bin/sh

### BEGIN INIT INFO
# Provides:           docker
# Required-Start:     $syslog $remote_fs
# Required-Stop:      $syslog $remote_fs
# Default-Start:      2 3 4 5
# Default-Stop:       0 1 6
# Short-Description:  Linux container runtime
# Description:        Linux container runtime
### END INIT INFO

DOCKER=/usr/bin/docker
DOCKER_PIDFILE=/var/run/docker.pid
DOCKER_OPTS=

PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin

# Check lxc-docker is present
[ -x $DOCKER ] || (log_failure_msg "docker not present"; exit 1)

# Get lsb functions
. /lib/lsb/init-functions

if [ -f /etc/default/lxc ]; then
	. /etc/default/lxc
fi

if [ "$1" = start ] && which initctl >/dev/null && initctl version | grep -q upstart; then
	exit 1
fi

check_root_id ()
{
	if [ "$(id -u)" != "0" ]; then
		log_failure_msg "Docker must be run as root"; exit 1
	fi
}

case "$1" in
	start)
		check_root_id || exit 1
		log_begin_msg "Starting Docker"
		mount | grep cgroup >/dev/null || mount -t cgroup none /sys/fs/cgroup 2>/dev/null
		start-stop-daemon --start --background $NO_CLOSE \
			--exec "$DOCKER" \
			--pidfile "$DOCKER_PIDFILE" \
			-- -d -p "$DOCKER_PIDFILE" \
			$DOCKER_OPTS
		log_end_msg $?
		;;

	stop)
		check_root_id || exit 1
		log_begin_msg "Stopping Docker"
		start-stop-daemon --stop \
			--pidfile "$DOCKER_PIDFILE"
		log_end_msg $?
		;;

	restart)
		check_root_id || exit 1
		docker_pid=`cat "$DOCKER_PIDFILE" 2>/dev/null`
		[ -n "$docker_pid" ] \
			&& ps -p $docker_pid > /dev/null 2>&1 \
			&& $0 stop
		$0 start
		;;

	force-reload)
		check_root_id || exit 1
		$0 restart
		;;

	status)
		status_of_proc -p "$DOCKER_PIDFILE" "$DOCKER" docker
		;;

	*)
		echo "Usage: $0 {start|stop|restart|status}"
		exit 1
		;;
esac

exit 0