# SPDX-License-Identifier: GPL-2.0-only
# Initially written by: Michael Tokarev <mjt@tls.msk.ru>
# For QEMU Debian downstream package

set -e

. /etc/init.d/functions

PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="QEMU Guest Agent"
NAME=qemu-ga
DAEMON=@bindir@/$NAME
PIDFILE=/var/run/$NAME.pid

# config
DAEMON_ARGS=""
# default transport
TRANSPORT=virtio-serial:/dev/virtio-ports/org.qemu.guest_agent.0
NO_START=0

test ! -r /etc/default/qemu-guest-agent || . /etc/default/qemu-guest-agent
test "$NO_START" = "0" || exit 0
test -x "$DAEMON" || exit 0

#
# Function that checks whenever system has necessary environment
# It also splits $TRANSPORT into $method and $path
#
do_check_transport() {
	method=${TRANSPORT%%:*};
	path=${TRANSPORT#*:}
	case "$method" in
	    virtio-serial | isa-serial)
		if [ ! -e "$path" ]; then
		    echo "$NAME: transport endpoint not found, not starting"
		    return 1
		fi
		;;
	esac
}

case "$1" in
  start)
	do_check_transport || exit 0
	echo -n "Starting $DESC: "
	start-stop-daemon -S -p $PIDFILE -x "$DAEMON" -- \
		$DAEMON_ARGS -d -m "$method" -p "$path"
	echo "$NAME."
	;;
  stop)
	echo -n "Stopping $DESC: "
	start-stop-daemon -K -x "$DAEMON" -p $PIDFILE
	echo "$NAME."
	;;
  status)
	status "$DAEMON"
	exit $?
	;;
  restart|force-reload)
	do_check_transport || exit 0
	echo -n "Restarting $DESC: "
	start-stop-daemon -K -x "$DAEMON" -p $PIDFILE
	sleep 1
	start-stop-daemon -S -p $PIDFILE -x "$DAEMON" -- \
		$DAEMON_ARGS -d -m "$method" -p "$path"
	echo "$NAME."
	;;
  *)
	N=/etc/init.d/$NAME
	echo "Usage: $N {start|stop|status|restart|force-reload}" >&2
	exit 1
	;;
esac

exit 0