description "Docker daemon"

start on (filesystem and net-device-up IFACE!=lo)
stop on runlevel [!2345]

limit nofile 524288 1048576

# Having non-zero limits causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
limit nproc unlimited unlimited

respawn

pre-start script
	# Cleanup any stale mounts left from previous shutdown
	# see https://bugs.launchpad.net/ubuntu/+source/docker.io/+bug/1404300
	grep "mapper/docker" /proc/mounts | awk '{ print $2 }' | \
		xargs -r umount || true
end script

kill timeout 20

script
	# modify these in /etc/default/$UPSTART_JOB (/etc/default/docker)
	DOCKERD=/usr/bin/dockerd
	DOCKER_OPTS=
	if [ -f /etc/default/$UPSTART_JOB ]; then
		. /etc/default/$UPSTART_JOB
	fi
	exec "$DOCKERD" $DOCKER_OPTS --raw-logs
end script

# Don't emit "started" event until docker.sock is ready.
# See https://github.com/docker/docker/issues/6647
post-start script
	DOCKER_OPTS=
	DOCKER_SOCKET=
	if [ -f /etc/default/$UPSTART_JOB ]; then
		. /etc/default/$UPSTART_JOB
	fi

	if ! printf "%s" "$DOCKER_OPTS" | grep -qE -e '-H|--host'; then
		DOCKER_SOCKET=/var/run/docker.sock
	else
		DOCKER_SOCKET=$(printf "%s" "$DOCKER_OPTS" | grep -oP -e '(-H|--host)\W*unix://\K(\S+)' | sed 1q)
	fi

	if [ -n "$DOCKER_SOCKET" ]; then
		while ! [ -e "$DOCKER_SOCKET" ]; do
			initctl status $UPSTART_JOB | grep -qE "(stop|respawn)/" && exit 1
			echo "Waiting for $DOCKER_SOCKET"
			sleep 0.1
		done
		echo "$DOCKER_SOCKET is up"
	fi
end script