gistfile1.txt

# /etc/init/sidekiq.conf - Sidekiq config

# This example config should work with Ubuntu 12.04+.  It
# allows you to manage multiple Sidekiq instances with
# Upstart, Ubuntu's native service management tool.
#
# See workers.conf for how to manage all Sidekiq instances at once.
#
# Save this config as /etc/init/sidekiq.conf then mange sidekiq with:
#   sudo start sidekiq index=0
#   sudo stop sidekiq index=0
#   sudo status sidekiq index=0
#
# or use the service command:
#   sudo service sidekiq {start,stop,restart,status}
#

description "Sidekiq Background Worker"

# no "start on", we don't want to automatically start
stop on (stopping workers_backoffice or runlevel [06])

# change to match your deployment user
setuid deploy
setgid deploy

respawn
respawn limit 3 30

instance $index

script
# this script runs in /bin/sh by default
# respawn as bash so we can source in rbenv
exec /bin/bash <<EOT
  # use syslog for logging
  exec &> /dev/kmsg

  # pull in system rvm
  export HOME=/home/deploy
  source /etc/profile.d/rvm.sh
  source /srv/backoffice/shared/config/env

  cd /srv/backoffice/current
  exec bin/sidekiq -i ${index} -e production -C config/sidekiq.yml -P tmp/pids/sidekiq-${index}.pid
EOT

• double quotes on line 28 around $index
• Line 33 should say this runs in dash because /bin/sh is a symlink and that's important, check that /bin/sh is dash first, but pretty sure it is
• Line 37 is uh... i mean if you say syslog is important, but upstart does log to /var/log/upstart just fine and any output you need should probably be parsed from there... that's just confusing and could make troubleshooting a bitch, however it's not technically "wrong"
• Line 44 cd's only to make the next line shorter?
• Line 45 doesn't escape anything properly and is very error prone.

doesn't end script need to happen? http://upstart.ubuntu.com/cookbook/#script