Method for starting a Mezzanine/Django site via Upstart script on Ubuntu 14.04

djablo.sh

#!/bin/bash
set -e
NUM_WORKERS=3
USER=www-data
GROUP=users
DIR=$(dirname $0)
APPNAME=${DIR##*/}
LOGFILE=/var/log/gunicorn/$APPNAME.log
LOGDIR=$(dirname $LOGFILE)
cd $DIR
[ -d $(dirname $LOGFILE) ] || mkdir -p $(dirname $LOGFILE)
[ -f ../bin/activate ] || exit 42
source ../bin/activate
[ -x ../bin/gunicorn_django ] || exit 43
exec ../bin/gunicorn_django -w $NUM_WORKERS \
    --user=$USER --group=$GROUP --log-level=debug \
    --log-file=$LOGFILE 2>>$LOGFILE

etc-init-djablo.conf

description "Djablo instance"
start on runlevel [2345]
stop on runlevel [!2345]
respawn
respawn limit 10 5
env NUM_CORES="$(cat /proc/cpuinfo | grep processor | wc -l)"
export NUM_CORES
exec /www/django/mezzanine/djablo.sh