#!/bin/sh

. /lib/init/initmethod-bbinit-functions.sh
. /lib/init/rc-once.sh

start() {
	if ! mount_root_rw; then
		systemctl --no-block rescue
		exit 1
	fi
	if run_rc_once; then
		rm -f /system-update
	fi
	systemctl daemon-reexec
	sleep 1
	if [ -d /var/lib/systemd/timesync ]; then
		touch /var/lib/systemd/timesync/clock
		chown systemd-timesync:nogroup /var/lib/systemd/timesync/clock
	fi
	exec "$0" umount
}

umount() {
	if ! mount_root_restore; then
		# remounting rw/ro during the second boot will flush anything
		# left in the filesystem journal
		ln -sf /etc/rc.once.d /system-update
		systemctl --no-block reboot
	else
		if [ -e /system-update ]; then
			systemctl --no-block rescue
		else
			systemctl --no-block default
		fi
	fi
}

case "$1" in

	start|"")
		start
		;;
	umount)
		umount
		;;
	*)
		echo "Usage: $0 {start|umount}" >&2
		exit 1
		;;
esac

exit 0