#!/bin/bash
### BEGIN INIT INFO
# Provides:          gpsd
# Required-Start:    $remote_fs $network
# Should-Start:      bluetooth dbus udev
# Required-Stop:     $remote_fs $network
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: GPS (Global Positioning System) daemon start/stop script
# Description:       Start/Stop script for the gpsd service daemon,
#                    which is able to monitor one or more GPS devices
#                    connected to a host computer, making all data on
#                    the location and movements of the sensors available
#                    to be queried on TCP port 2947.
### END INIT INFO

# Author: Bernd Zeimetz <bzed@debian.org>
#
# Please remove the "Author" lines above and replace them
# with your own name if you copy and modify this script.

# 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="GPS (Global Positioning System) daemon"
NAME=gpsd
DAEMON=/usr/sbin/$NAME
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME
CAPABILITY=/sys/devices/platform/mts-io/capability/gps

# Read configuration, if present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Exit if we have no GPS capability
( [[ -f $CAPABILITY ]] && (($(cat $CAPABILITY) == 1)) ) || exit 0

# Exit if no gps found
([[ -n $GPS_LINE ]] && [[ -c $GPS_LINE ]]) || exit 0

# Assemble the GPS devices
# PPS device is needed so GPSD finds the PPS.
if [[ -c $GPS_PPS ]] ; then
	: ${GPS_DEVICES:="$GPS_LINE $GPS_PPS"}
else
	: ${GPS_DEVICES:="$GPS_LINE"}
fi


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

if [ -z "$GPSD_SOCKET" ] && [ -z "$GPS_DEVICES" ]; then
	GPSD_SOCKET=/var/run/gpsd.sock
fi

if [ -n "$GPSD_SOCKET" ]; then
        GPSD_OPTIONS="$GPSD_OPTIONS -F $GPSD_SOCKET"
fi

#
# Function that starts the daemon/service
#
do_start()
{
	/usr/sbin/start-stop-daemon -N -20 --start --quiet --pidfile $PIDFILE --exec $DAEMON --test \
        -- $GPSD_OPTIONS -P $PIDFILE $GPS_DEVICES > /dev/null \
		|| return 1
	# Return
	#   0 if daemon has been started
	#   1 if daemon was already running
	#   2 if daemon could not be started

        # If the SET_GPS_SPEED function exists, call it to set the GPS Speed.
        what=$(type SET_GPS_SPEED 2>/dev/null)
        if [[ $what =~ SET_GPS_SPEED[[:space:]]is[[:space:]]a[[:space:]]function ]] ; then
            SET_GPS_SPEED	
        fi

	/usr/sbin/start-stop-daemon -N -20 --start --quiet --pidfile $PIDFILE --exec $DAEMON -- \
		$GPSD_OPTIONS -P $PIDFILE $GPS_DEVICES \
		|| return 2
}

#
# 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
	/usr/sbin/start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
	RETVAL="$?"
	[ "$RETVAL" = 2 ] && return 2
	# Many daemons don't delete their pidfiles when they exit.
	rm -f $PIDFILE
	return "$RETVAL"
}

#
# Function that sends a SIGHUP to the daemon/service
#
do_reload() {
	#
	# If the daemon can reload its configuration without
	# restarting (for example, when it is sent a SIGHUP),
	# then implement that here.
	#
	/usr/sbin/start-stop-daemon -N -20 --stop --signal 1 --quiet --pidfile $PIDFILE --name $NAME
	return 0
}

do_status() {
        NAME=$1
        PIDFILE=$2
        # -t: test only but not stop
        start-stop-daemon -K -t --quiet --pidfile $PIDFILE --name $NAME
        # exit with status 0 if process is found
        if [ "$?" = "0" ]; then
                return 0
        else
                return 1
        fi
}

case "$1" in
  start)
	if ! [[ $ENABLED =~ ^[yY][eE][sS]$ ]] ; then
		exit 0
	fi
	echo "Starting $DESC" "$NAME"
	do_start
	exit $?
	;;
  stop)
	echo "Stopping $DESC" "$NAME"
	do_stop
	exit $?
	;;
  status)
        echo -n "status $NAME ... "
        do_status "$NAME" "$PIDFILE"
        if [ "$?" = "0" ]; then
                echo "running"
                exit 0
        else
                echo "stopped"
                exit 1
        fi
        ;;
  reload|force-reload)
	echo "Reloading $DESC" "$NAME"
	do_reload
	exit $?
	;;
  restart)
	#
	# If the "reload" option is implemented then remove the
	# 'force-reload' alias
	#
	echo "Restarting $DESC" "$NAME"
	do_stop
	case "$?" in
	  0|1)
		do_start
		exit $?
		;;
	  *)
	 	# Failed to stop
		exit 1
		;;
	esac
	;;
  *)
	echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
	exit 3
	;;
esac

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