#!/bin/bash

NAME=asterisk
USER=asterisk
GROUP=asterisk
RUNDIR=/var/run/$NAME
PIDFILE=$RUNDIR/$NAME.pid
STARTCMD="(cd /; /usr/sbin/asterisk -G $GROUP -U $USER)"
STOPCMD="/usr/sbin/asterisk -r -x 'core stop now'"
STOPGRACECMD="/usr/sbin/asterisk -r -x 'core stop gracefully'"
STOPTIMEOUT=300

function getpid() {
	if [ -z "$PIDFILE" ]; then
		pid="$(pgrep -xfn "$STARTCMD")"
	else
		if [ -f "$PIDFILE" ]; then
			pid=$(< $PIDFILE)
			if [ ! -d /proc/"$pid" ]; then
				echo "$NAME: removing stale pidfile $PIDFILE" >&2
				rm -f "$PIDFILE"
				unset pid
			fi
		fi
	fi
	echo "$pid"
}

case $1 in
start)
	pid=$(getpid)
	install -d -m 755 -o $USER $RUNDIR || exit 1
	if [ -n "$pid" ]; then
		echo "$NAME already running with pid $pid" >&2
		exit 1
	fi
	eval "$STARTCMD"
	;;
stop|stopnice)
	pid=$(getpid)
	if [ -n "$pid" ]; then
		if [ "$1" == "stop" ]; then
			if [ -n "$STOPCMD" ]; then
				eval "$STOPCMD"
			else
				kill "$pid"
			fi
		else
			if [ -n "$STOPCMD" ]; then
				eval "$STOPGRACECMD"
			else
				echo "$NAME: $1 not implemented"
				exit 1
			fi
		fi
		t=$(printf '%(%s)T' -1)
		tend=$((t+STOPTIMEOUT))
		while [ -d /proc/$pid -a $t -lt $tend ]; do
			sleep 0.5
			t=$(printf '%(%s)T' -1)
		done
		if [ -d /proc/"$pid" ]; then
			echo "$NAME still running with pid $pid" >&2
		else
			[ -n "$PIDFILE" ] && rm -f "$PIDFILE"
		fi
	else
		echo "$NAME is not running" >&2
	fi
	;;
restart)
	$0 stop && \
	$0 start
	;;
restartnice)
	$0 stopnice && \
	$0 start
	;;
status)
	pid=$(getpid)
	if [ -n "$pid" ]; then
		echo "$NAME is running with pid $pid"
	else
		echo "$NAME is not running"
	fi
	;;
*)
	echo "usage: $0 [start|stop|stopnice|restart|restartnice|status]"
	;;
esac