#!/bin/sh
### BEGIN INIT INFO
# Provides:          dump1090-mutability
# Required-Start:    $remote_fs
# Required-Stop:     $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: dump1090 daemon (mutability variant)
# Description:       Receives ADS-B messages from a RTLSDR dongle
#                    and makes them available to other applications via
#                    a variety of network protocols.
### 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
DESC="dump1090-mutability daemon"
NAME=dump1090-mutability
DAEMON=/usr/bin/$NAME
ARGS="--quiet"
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME

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

# Set defaults:
START_DUMP1090=no
DUMP1090_USER=dump1090
LOGFILE=/var/log/$NAME.log
DEVICE=0
GAIN=max
PPM=0
OVERSAMPLE=no
FIX_CRC=no
PHASE_ENHANCE=no
AGGRESSIVE=no
LAT=
LON=
HTTP_PORT=0
RAW_INPUT_PORT=30001
RAW_OUTPUT_PORT=30002
SBS_OUTPUT_PORT=30003
BEAST_INPUT_PORT=30004
BEAST_OUTPUT_PORT=30005
NET_HEARTBEAT=60
NET_OUTPUT_SIZE=500
NET_OUTPUT_INTERVAL=1
NET_BUFFER=4
BIND_ADDRESS=127.0.0.1
STATS_INTERVAL=3600
JSON_DIR=/run/$NAME
JSON_INTERVAL=1
EXTRA_ARGS=

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

# work out daemon args

# receiver:
case "x$DEVICE" in
 x|x0) ARGS="$ARGS --net" ;;
 xnone) ARGS="$ARGS --net-only" ;;
 *) ARGS="$ARGS --net --device-index $DEVICE" ;;
esac
case "x$GAIN" in
 x|xmax) ;;
 xagc) ARGS="$ARGS --gain -10" ;;  
 *) ARGS="$ARGS --gain $GAIN" ;;
esac
if [ "x$PPM" != "x0" ]; then ARGS="$ARGS --ppm $PPM"; fi
if [ "x$OVERSAMPLE" = "xyes" ]; then ARGS="$ARGS --oversample"; fi

# decoder:
if [ "x$FIX_CRC" = "xyes" ]; then ARGS="$ARGS --fix"; fi
if [ "x$PHASE_ENHANCE" = "xyes" ]; then ARGS="$ARGS --phase-enhance"; fi
if [ "x$AGGRESSIVE" = "xyes" ]; then ARGS="$ARGS --aggressive"; fi
if [ -n "$LAT" ]; then ARGS="$ARGS --lat $LAT"; fi
if [ -n "$LON" ]; then ARGS="$ARGS --lon $LON"; fi

# net:
if [ "x$HTTP_PORT" != "x8080" ]; then ARGS="$ARGS --net-http-port $HTTP_PORT"; fi
if [ "x$RAW_INPUT_PORT" != "x30001" ]; then ARGS="$ARGS --net-ri-port $RAW_INPUT_PORT"; fi
if [ "x$RAW_OUTPUT_PORT" != "x30002" ]; then ARGS="$ARGS --net-ro-port $RAW_OUTPUT_PORT"; fi
if [ "x$SBS_OUTPUT_PORT" != "x30003" ]; then ARGS="$ARGS --net-sbs-port $SBS_OUTPUT_PORT"; fi
if [ "x$BEAST_INPUT_PORT" != "x30004" ]; then ARGS="$ARGS --net-bi-port $BEAST_INPUT_PORT"; fi
if [ "x$BEAST_OUTPUT_PORT" != "x30005" ]; then ARGS="$ARGS --net-bo-port $BEAST_OUTPUT_PORT"; fi
if [ "x$NET_HEARTBEAT" != "x60" ]; then ARGS="$ARGS --net-heartbeat $NET_HEARTBEAT"; fi
if [ "x$NET_OUTPUT_SIZE" != "x0" ]; then ARGS="$ARGS --net-ro-size $NET_OUTPUT_SIZE"; fi
if [ "x$NET_OUTPUT_INTERVAL" != "x0" ]; then ARGS="$ARGS --net-ro-interval $NET_OUTPUT_INTERVAL"; fi
if [ "x$NET_BUFFER" != "x0" ]; then ARGS="$ARGS --net-buffer $NET_BUFFER"; fi
if [ -n "$BIND_ADDRESS" ]; then ARGS="$ARGS --net-bind-address $BIND_ADDRESS"; fi

# misc:
if [ "x$STATS_INTERVAL" != "x0" ]; then ARGS="$ARGS --stats-every $STATS_INTERVAL"; fi
if [ "x$JSON_DIR" != "x" ]; then ARGS="$ARGS --write-json $JSON_DIR"; fi
if [ "x$JSON_INTERVAL" != "x1" ]; then ARGS="$ARGS --write-json-every $JSON_INTERVAL"; fi
if [ -n "$EXTRA_ARGS" ]; then ARGS="$ARGS $EXTRA_ARGS"; fi

# 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_DUMP1090" != "xyes" ]; then
            log_warning_msg "Not starting $NAME daemon, disabled via /etc/default/$NAME"
            return 2
        fi

	start-stop-daemon --start --quiet --pidfile $PIDFILE --user $DUMP1090_USER --exec $DAEMON --test > /dev/null \
		|| return 1

        # create JSON_DIR with the appropriate permissions
        # (it is on /run by default, so will be lost on reboot)
        if [ "x$JSON_DIR" != "x" ]; then
           if [ ! -e $JSON_DIR ]; then
             (mkdir $JSON_DIR && chmod 0755 $JSON_DIR && chown $DUMP1090_USER $JSON_DIR) || log_warning_msg "Failed to create $JSON_DIR"
           fi
        fi

	start-stop-daemon --start --quiet --pidfile $PIDFILE --user $DUMP1090_USER --chuid $DUMP1090_USER --make-pidfile --background --no-close --exec $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 $DUMP1090_USER --exec $DAEMON
	RETVAL="$?"
	[ "$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

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