catalyst nginx fastcgi /etc/init.d script

 #! /bin/sh
### BEGIN INIT INFO
# Provides:          application-catalyst-foo
# Required-Start:    $local_fs $network
# Required-Stop:     $local_fs $network
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Starts the FastCGI app server for the "Myapp" site
# Description:       The FastCGI application server for the "Myapp" site
### END INIT INFO

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
SITE_HOME=/home/user/myapp
DAEMON=$SITE_HOME/script/myapp_fastcgi.pl
NAME=myapp_fastcgi
DESC="'myapp' app server"
USER=user

#new stuff
MAX_PORT=8999
MIN_PORT=8000
PORT_FILE=/root/ports/$NAME.port
NGINX_CONF=/etc/nginx/nginx.conf
NGINX_PID=`cat /var/run/nginx.pid`

test -f $DAEMON || exit 0

#get port
if [[ -f $PORT_FILE ]]; then
    LAST_PORT=`cat $PORT_FILE`
    PORT_TO_USE=$(($LAST_PORT + 1))
else
    echo "Must create $PORT_FILE with current port used for FastCGI in $NGINX_CONF"
    echo "Port must be between $MIN_PORT and $MAX_PORT"
    exit
fi

# Reset so me don't go up forever
if [[ $PORT_TO_USE -gt $MAX_PORT ]]; then
    PORT_TO_USE=$MIN_PORT
fi

OPTS="-l :$PORT_TO_USE -n 6"
NEW_PID_FILE="/var/run/$NAME.$PORT_TO_USE.pid"
OLD_PID_FILE="/var/run/$NAME.$LAST_PORT.pid"

if [[ -f $OLD_PID_FILE ]]; then
    OLD_PID=`cat $OLD_PID_FILE`
fi

set -e

start_daemon()
{
 echo "Starting $DESC: $NAME"

 if [[ ! -f $OLD_PID_FILE || $RELOAD -eq 1 ]]; then
    echo "IN HERE DAWG"
    sed -i "s/$LAST_PORT/$PORT_TO_USE/g" $NGINX_CONF

    start-stop-daemon --start --quiet --pidfile $NEW_PID_FILE -d $SITE_HOME \
    --exec /usr/bin/perl --startas $DAEMON --chuid $USER --background --make-pid -- $OPTS

    echo $PORT_TO_USE > $PORT_FILE
 fi

 if [[ $RELOAD -eq 1 ]]; then
    sleep 5
 fi

 echo "Reloading nginx with pid $NGINX_PID."
 kill -HUP $NGINX_PID
}


stop_daemon()
{
 echo -n "Stopping $DESC: "
 if [[ -f $OLD_PID_FILE ]]; then
    start-stop-daemon --stop --signal TERM --pidfile $OLD_PID_FILE
    rm $OLD_PID_FILE
 fi
 echo "$NAME."
}

reload_daemon()
{
 RELOAD=1
 echo "Reloading $DESC: $NAME."
 start_daemon
 stop_daemon
}

case "$1" in
 start)
 start_daemon
 ;;
 stop)
 stop_daemon
 ;;
 reload)
 reload_daemon
 ;;
 restart|force-reload)
 stop_daemon
 sleep 5
 start_daemon
 ;;
 *)
 N=/etc/init.d/$NAME
 echo "Usage: $N {start|stop|reload|restart|force-reload}" >&2
 exit 1
 ;;
esac

exit 0