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

depend() {
	before xenstored
}

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

handle_kernel_modules() {
	local XEN_DEFAULT_KERNEL_MODULES="
		xen-evtchn
		xen-gntdev
		xen-gntalloc
		xen-blkback
		xen-netback
		xen-pciback
		gntdev
		netbk
		blkbk
		xen-scsibk
		usbbk
		pciback
		xen-acpi-processor
		blktap2
		blktap
	"

	[ "$1" = "remove" ] && OPTS="-r"

	XEN_KERNEL_MODULES="${XEN_KERNEL_MODULES:-${XEN_DEFAULT_KERNEL_MODULES}}"
	for i in ${XEN_KERNEL_MODULES}; do
		modprobe ${OPTS} $i 2>/dev/null
	done
	return 0
}

start() {
	ebegin "Starting xencommons daemon"

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

	# mount xenfs in dom0 or domU with a pv_ops kernel
	if ! test -f /proc/xen/capabilities && \
	   ! grep '^xenfs ' /proc/mounts >/dev/null;
	then
		mount -t xenfs xenfs /proc/xen
	fi

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

	handle_kernel_modules

	eend $? "Failed to start xencommons"
}

stop () {
	ebegin "Stopping xencommons"
	if ! is_privileged_domain; then
		eend 1 "Not running on a privileged domain. xencommons not started"
		return 1
	fi

	handle_kernel_modules remove

	eend $? "Failed to stop xencommons"
}