#!/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/$NAME
ARGS=""
PIDFILE=/var/run/$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
[ -z "$START_DUMP1090" ] && START_DUMP1090=no
[ -z "$DUMP1090_USER" ] && DUMP1090_USER="missing-DUMP1090_USER-setting-in-config"
[ -z "$HTTP_PORT" ] && HTTP_PORT=0
[ -z "$RAW_INPUT_PORT" ] && RAW_INPUT_PORT=0
[ -z "$RAW_OUTPUT_PORT" ] && RAW_OUTPUT_PORT=0
[ -z "$SBS_OUTPUT_PORT" ] && SBS_OUTPUT_PORT=0
[ -z "$BEAST_INPUT_PORT" ] && BEAST_INPUT_PORT=0
[ -z "$BEAST_OUTPUT_PORT" ] && BEAST_OUTPUT_PORT=0
[ -z "$FATSV_OUTPUT_PORT" ] && FATSV_OUTPUT_PORT=0
[ -z "$NET_BUFFER" ] && NET_BUFFER=0
[ -z "$JSON_INTERVAL" ] && JSON_INTERVAL=0
[ -z "$MAX_RANGE" ] && MAX_RANGE=300

# receiver:
NICELEVEL="--nicelevel -5"
case "x$DEVICE" in
 x|x0) ARGS="$ARGS --net" ;;
 xnone) ARGS="$ARGS --net-only"; NICELEVEL="" ;;
 *) ARGS="$ARGS --net --device-index $DEVICE" ;;
esac
case "x$GAIN" in
 x|xmax) ;;
 xagc) ARGS="$ARGS --gain -10" ;;  
 *) ARGS="$ARGS --gain $GAIN" ;;
esac
if [ -n "$PPM" ]; 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 $LON"; fi
ARGS="$ARGS --max-range $MAX_RANGE"; fi

# net:

ARGS="$ARGS --net-http-port $HTTP_PORT \
--net-ri-port $RAW_INPUT_PORT --net-ro-port $RAW_OUTPUT_PORT \
--net-bi-port $BEAST_INPUT_PORT --net-bo-port $BEAST_OUTPUT_PORT \
--net-sbs-port $SBS_OUTPUT_PORT --net-fatsv-port $FATSV_OUTPUT_PORT"
if [ -n "$NET_HEARTBEAT" ]; then ARGS="$ARGS --net-heartbeat $NET_HEARTBEAT"; fi
if [ -n "$NET_OUTPUT_SIZE" ]; then ARGS="$ARGS --net-ro-size $NET_OUTPUT_SIZE"; fi
if [ -n "$NET_OUTPUT_INTERVAL" ]; then ARGS="$ARGS --net-ro-interval $NET_OUTPUT_INTERVAL"; fi
if [ "$NET_BUFFER" -le "65536" ]; then ARGS="$ARGS --net-buffer 0"
elif [ "$NET_BUFFER" -le "131072" ]; then ARGS="$ARGS --net-buffer 1"
elif [ "$NET_BUFFER" -le "262144" ]; then ARGS="$ARGS --net-buffer 2"
else ARGS="$ARGS --net-buffer 3"; fi
if [ -n "$NET_BIND_ADDRESS" ]; then ARGS="$ARGS --net-bind-address $NET_BIND_ADDRESS"; fi

# misc:
if [ -n "$STATS_INTERVAL" ]; then ARGS="$ARGS --stats-every $STATS_INTERVAL"; fi
if [ -n "$JSON_DIR" ]; then ARGS="$ARGS --write-json $JSON_DIR"; fi
if [ -n "$JSON_INTERVAL" ]; then ARGS="$ARGS --write-json-every $JSON_INTERVAL"; fi
case "x$JSON_LOCATION_ACCURACY" in
  xexact) ARGS="$ARGS --json-location-accuracy 2" ;;
  xapproximate) ARGS="$ARGS --json-location-accuracy 1" ;;
  *) ARGS="$ARGS --json-location-accuracy 0" ;;
esac

if [ "x$LOG_DECODED_MESSAGES" != "xyes" ]; then ARGS="$ARGS --quiet"; 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

        # create logfile with the appropriate permissions if not already there
        # (the cronjob running as DUMP1090_USER wants to append to it)
        touch $LOGFILE
        chown "$DUMP1090_USER":root $LOGFILE

	start-stop-daemon --start $NICELEVEL --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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