#!/sbin/openrc-run
# Copyright 1999-2017 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

depend() {
	need xencommons xenstored xenconsoled
}

is_privileged_domain() {
	grep -qsE '^control_d$' /proc/xen/capabilities
	return $?
}

xen_setvars() {
	. /etc/xen/scripts/hotplugpath.sh

	XENQEMUDEV_PIDFILE=/run/xenqemudev.pid

	# xen-4.5 change the path
	XEN_QEMU="${LIBEXEC}/qemu-system-i386"
	[ -e ${XEN_QEMU} ] && return
	XEN_QEMU="${LIBEXEC_BIN}/qemu-system-i386"
}

xen_qemu_start() {
	if [ -z "${XENQEMUDEV_FILE_BACKEND_ENABLE}" ]; then
		ewarn " QEMU disk backend not enabled"
		ewarn " enable XENQEMUDEV_FILE_BACKEND_ENABLE in /etc/conf.d/xenqemudev"
		return 1
	fi

	xen_setvars

	if [ ! -c /dev/xen/gntdev ]; then
		einfo " Xen gntdev driver not loaded"
		return 1
	fi

	if [ -e "${XEN_QEMU}" ]; then
		einfo " Starting QEMU as disk backend for dom0"

		XENQEMUDEV_DEFAULT_OPTS="-xen-domid 0 -xen-attach -name dom0 \
			-nographic -M xenpv -daemonize \
			-monitor /dev/null -serial /dev/null -parallel /dev/null"

		XENQEMUDEV_OPTS=${XENQEMUDEV_OPTS:-${XENQEMUDEV_DEFAULT_OPTS}}

		start-stop-daemon --start --exec ${XEN_QEMU} \
			--pidfile ${XENQEMUDEV_PIDFILE} \
			-- -pidfile ${XENQEMUDEV_PIDFILE} \
			${XENQEMUDEV_OPTS}
		return $?
	fi
}

start() {
	ebegin "Starting xenqemudev daemon"

	# not running in Xen dom0 or domU
	if [ ! -d /proc/xen ]; then
		eend 1 "Not running in Xen mode"
		return 1
	fi

	if ! is_privileged_domain; then
		eend 1 "Not running on a privileged domain. xenqemudev not started"
		return 1
	fi

	xen_qemu_start

	eend $? "Failed to start xenqemudev"
}

stop () {
	ebegin "Stopping xenqemudev"

	xen_setvars

	start-stop-daemon --stop --exec ${XEN_QEMU} \
		--pidfile ${XENQEMUDEV_PIDFILE}

	eend $? "Stopping xenqemudev, as it cannot be restarted."
}