Capistrano with Unicorn Reloading

deploy.rb

set :application, "yyyyyyyyyyy"
set :repository,  "here-be-your-githubs"
set :scm, :git
set :branch, "master"
set :user, "xxxxxxxx"
set :scm_verbose, true
default_run_options[:pty] = true
set :deploy_via, :remote_cache
ssh_options[:forward_agent] = true

role :web, "XXXXXX"
role :app, "XXXXXX"
role :db,  "XXXXXX", :primary => true

require 'bundler/capistrano'
require "whenever/capistrano"
set :whenever_command, "bundle exec whenever"

after "deploy:update_code", "assets:precompile"
after "deploy:restart", "deploy:cleanup"

set :rails_env, "production"

puts "*********** DEPLOYING TO PRODUCTION *********"
puts "ARE YOU SURE YOU WANT TO DO THIS? (y or n)"

input = STDIN.gets.strip.downcase
if input != 'y'
  abort("ABORTING DEPLOYMENT")
end
set :unicorn_pid, "#{current_path}/tmp/pids/unicorn.pid"

namespace :unicorn do
  desc "start unicorn"
  task :start, :roles => :app, :except => { :no_release => true } do 
    run "cd #{current_path} && #{try_sudo} bundle exec unicorn_rails -c #{current_path}/config/unicorn/#{rails_env}.rb -E #{rails_env} -D"
  end
  desc "stop unicorn"
  task :stop, :roles => :app, :except => { :no_release => true } do 
    run "#{try_sudo} kill `cat #{unicorn_pid}`"
  end
  desc "graceful stop unicorn"
  task :graceful_stop, :roles => :app, :except => { :no_release => true } do
    run "#{try_sudo} kill -s QUIT `cat #{unicorn_pid}`"
  end
  desc "reload unicorn"
  task :reload, :roles => :app, :except => { :no_release => true } do
    run "#{try_sudo} kill -s USR2 `cat #{unicorn_pid}`"
  end

  after "deploy:restart", "unicorn:reload"
end

namespace :rake do  
  desc "Run a task on a remote server."  
  # run like: cap staging rake:invoke task=a_certain_task  
  task :invoke do  
    run("cd #{deploy_to}/current && bundle exec rake #{ENV['task']} RAILS_ENV=#{rails_env}")  
  end  
end

namespace :assets do
  desc "Precompile assets"
  task :precompile do
    run("cd #{release_path}; RAILS_ENV=#{rails_env} RAILS_GROUPS=assets bundle exec rake assets:precompile")
  end
end

namespace :indexes do
  desc "Create Mongoid Indexes" 
  task :create, :roles=>:app do
    run "cd #{current_path}; RAILS_ENV=#{rails_env} bundle exec rake db:mongoid:create_indexes"
  end
end