precompile rails 3 assets locally

precompile.cap.rb

namespace :deploy do
  namespace :assets do
    desc 'Run the precompile task locally and rsync with shared'
    task :precompile, :roles => :web, :except => { :no_release => true } do
      run_locally("bundle exec rake assets:precompile")
      servers = find_servers_for_task(current_task)
      port_option = port ? " -e 'ssh -p #{port}' " : ''
      servers.each do |server|
        run_locally("rsync --recursive --times --rsh=ssh --compress --human-readable #{port_option} --progress public/assets #{user}@#{server}:#{shared_path}")
      end
    end
  end
end