definitions_proc.rb

require 'timeout'
include Rackspace::Proc

define :wait_on_proc, :timeout_sec => 60 do
  include_recipe "rackspace"
  begin
    Timeout::timeout(params[:timeout_sec]) do
      while getProcPid(params[:name])
        sleep(5)
      end
    end
  rescue
    Chef::Log.warn("Process #{params[:name]} is taking too long, move along!")
    #Chef::Application.fatal!("Process #{params[:name]} is taking too long, I quit!", -8008)
  end
end

define :is_proc, :timeout_sec => 60 do
  include_recipe "rackspace"
  if getProcPid(params[:name])
    Chef::Log.info("libcloud deployment script running.")
    Chef::Log.info("Sleeping for up to #{params[:timeout_sec]} seconds...")
    wait_on_proc params[:name] do
      timeout_sec params[:timeout_sec]
    end
  end
end

libraries_proctable.rb

begin
  require 'sys/proctable'
rescue LoadError
  Chef::Log.warn("Missing gem 'sys-proctable'")
end

module Rackspace
  module Proc
    def getProcPid(name)
      Sys::ProcTable.ps{ |p|
        if /#{name}/ =~ p.cmdline
          return p.pid
        end
      }
    end
  end
end

recipes_rackspace.rb

# force the gem to be installed during the compile phase
# of the chef run
r = gem_package "sys-proctable" do
  action :nothing
end
r.run_action(:install)