#!/bin/bash
### BEGIN INIT INFO
# Provides:          mlat-client-adsbfi
# Required-Start:    $remote_fs
# Required-Stop:     $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Multilateration client
# Description:       Receives ADS-B messages from a receiver
#                    and forwards them to a server for multilateration of
#                    the aircraft position.
### END INIT INFO

# Do NOT "set -e"

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/sbin:/usr/sbin:/bin:/usr/bin
NAME=mlat-client-adsbfi
DESC="$NAME daemon"
DAEMON=/usr/bin/$NAME
ARGS=""
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME

# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# work out daemon args

# sanitize missing settings
badconfig=""
[ -z "$START_CLIENT" ] && START_CLIENT=no
[ -z "$RUN_AS_USER" ] && RUN_AS_USER="missing-RUN_AS_USER-setting-in-config"
[ -z "$SERVER_USER" ] && badconfig="$badconfig SERVER_USER"
[ -z "$LAT" ] && badconfig="$badconfig LAT"
[ -z "$LON" ] && badconfig="$badconfig LON"
[ -z "$ALT" ] && badconfig="$badconfig ALT"
[ -z "$INPUT_TYPE" ] && INPUT_TYPE=dump1090
[ -z "$INPUT_HOSTPORT" ] && badconfig="$badconfig INPUT_HOSTPORT"
[ -z "$SERVER_HOSTPORT" ] && badconfig="$badconfig SERVER_HOSTPORT"

ARGS="--user $SERVER_USER --lat $LAT --lon $LON --alt $ALT --input-type $INPUT_TYPE --input-connect $INPUT_HOSTPORT --server $SERVER_HOSTPORT"

for r in $RESULTS
do
    if [ "$r" != "none" ]
    then
        ARGS="$ARGS --results $r"
    fi
done

ARGS="$ARGS $EXTRA_ARGS"

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.2-14) to ensure that this file is present
# and status_of_proc is working.
. /lib/lsb/init-functions

#
# Function that starts the daemon/service
#
do_start()
{
	# Return
	#   0 if daemon has been started
	#   1 if daemon was already running
	#   2 if daemon could not be started

        if [ "x$START_CLIENT" != "xyes" ]; then
            log_warning_msg "Not starting $NAME daemon, disabled via /etc/default/$NAME"
            return 2
        fi

        if [ -n "$badconfig" ]; then
            log_warning_msg "Not starting $NAME daemon, missing configuration options ($badconfig)"
            return 2
        fi

	start-stop-daemon --start --quiet --pidfile $PIDFILE --user "$RUN_AS_USER" --startas $DAEMON --test > /dev/null \
		|| return 1

	start-stop-daemon --start --nicelevel 5 --quiet --pidfile $PIDFILE --user "$RUN_AS_USER" --chuid "$RUN_AS_USER" --make-pidfile --background --no-close --startas $DAEMON -- \
		$ARGS >>$LOGFILE 2>&1 \
		|| return 2
        sleep 1
}

#
# Function that stops the daemon/service
#
do_stop()
{
	# Return
	#   0 if daemon has been stopped
	#   1 if daemon was already stopped
	#   2 if daemon could not be stopped
	#   other if a failure occurred
	start-stop-daemon --stop --retry=TERM/30/KILL/5 --pidfile $PIDFILE --user "$RUN_AS_USER"
	RETVAL="$?"
	[ "$RETVAL" = 2 ] && return 2
        sleep 1
	# Many daemons don't delete their pidfiles when they exit.
	rm -f $PIDFILE
	return "$RETVAL"
}

case "$1" in
  start)
	[ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
	do_start
	case "$?" in
		0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
		2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
	esac
	;;
  stop)
	[ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
	do_stop
	case "$?" in
		0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
		2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
	esac
	;;
  status)
	status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
	;;
  restart|force-reload)
	log_daemon_msg "Restarting $DESC" "$NAME"
	do_stop
	case "$?" in
	  0|1)
		do_start
		case "$?" in
			0) log_end_msg 0 ;;
			1) log_end_msg 1 ;; # Old process is still running
			*) log_end_msg 1 ;; # Failed to start
		esac
		;;
	  *)
		# Failed to stop
		log_end_msg 1
		;;
	esac
	;;
  *)
	echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
	exit 3
	;;
esac

:
