Capistrano running clockwork as daemon with upstart

clockwork.rb

after "deploy:stop", "clockwork:stop"
after "deploy:start", "clockwork:start"
after "deploy:restart", "clockwork:restart"

set :clockwork_roles, :blabla
set :cw_log_file, "#{current_path}/log/clockwork.log"
set :cw_pid_file, "#{current_path}/tmp/pids/clockwork.pid"
set :rails_env, ENV['rails_env'] || ''

namespace :clockwork do
  desc "Stop clockwork"
  task :stop, :roles => :app, :on_no_matching_servers => :continue do
    #2>/dev/null skips errors if the file is found but process is not running for some reason
    run "if [ -d #{current_path} ] && [ -f #{cw_pid_file} ]; then cd #{current_path} && kill -int $(cat #{cw_pid_file}) 2>/dev/null; else echo 'clockwork was not running' ; fi"
  end

  desc "Start clockwork"
  task :start, :roles => :app, :on_no_matching_servers => :continue do
    run "cd #{current_path}; nohup bundle exec clockwork config/clockwork.rb -e #{rails_env} >> #{current_path}/log/clockwork.log 2>&1 &", :pty => false
    # get process id
    run "ps -eo pid,command | grep clockwork | grep -v grep | awk '{print $1}' > #{cw_pid_file}"
  end

  desc "Restart clockwork"
  task :restart, :roles => #{clockwork_roles}, :on_no_matching_servers => :continue do
    stop
    start
  end
end

Updated my hastily coded tasks to catch the pid correctly and some error scenarios.