unicorn init script

gistfile1.sh

#!/bin/bash
### BEGIN INIT INFO
# Provides:          says-dot-com-production
# Required-Start:    $all
# Required-Stop:     $network $local_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start the says-dot-com-production unicorns at boot
# Description:       Enable says-dot-com-staging at boot time.
### END INIT INFO
# 
# Use this as a basis for your own Unicorn init script.
# Change says-dot-com-staging to match your app.
# Make sure that all paths are correct.

set -u
set -e

TIMEOUT=${TIMEOUT-60}
APP_NAME=says-dot-com-production
APP_ROOT="/var/www/$APP_NAME/current"
APP_SHARED_ROOT="/var/www/$APP_NAME/shared"
PID="/var/www/$APP_NAME/shared/pids/unicorn.pid"
ENV=production

UNICORN_OPTS="-D -E $ENV -c $APP_SHARED_ROOT/config/unicorn.rb"
CMD="cd $APP_ROOT; bundle exec unicorn $UNICORN_OPTS"

old_pid="$PID.oldbin"

cd $APP_ROOT || exit 1

sig () {
	test -s "$PID" && kill -$1 `cat $PID`
}

oldsig () {
	test -s $old_pid && kill -$1 `cat $old_pid`
}

case ${1-help} in
start)
	sig 0 && echo >&2 "Already running" && exit 0
	su - ubuntu -c "$CMD"
	;;
stop)
	sig QUIT && exit 0
	echo >&2 "Not running"
	;;
force-stop)
	sig TERM && exit 0
	echo >&2 "Not running"
	;;
restart|reload)
	sig HUP && echo reloaded OK && exit 0
	echo >&2 "Couldn't reload, starting '$CMD' instead"
	su - ubuntu -c "$CMD"
	;;
upgrade)
	if sig USR2 && sleep 2 && sig 0 && oldsig QUIT
	then
		n=$TIMEOUT
		while test -s $old_pid && test $n -ge 0
		do
			printf '.' && sleep 1 && n=$(( $n - 1 ))
		done
		echo

		if test $n -lt 0 && test -s $old_pid
		then
			echo >&2 "$old_pid still exists after $TIMEOUT seconds"
			exit 1
		fi
		exit 0
	fi
	echo >&2 "Couldn't upgrade, starting '$CMD' instead"
	su - ubuntu -c "$CMD"
	;;
rotate)
	sig USR1 && echo rotated logs OK && exit 0
	echo >&2 "Couldn't rotate logs" && exit 1
	;;
*)
 	echo >&2 "Usage: $0 <start|stop|restart|upgrade|rotate|force-stop>"
 	exit 1
 	;;
esac

This worked well for me. The only thing I noticed is that unicorn ignores PID, so it had to be added to the config file.