Only run assets:precompile when assets have been changed

deploy.rb

namespace :deploy do
  namespace :assets do
    task :precompile, :roles => :web, :except => { :no_release => true } do
      precompile_command = %Q{cd #{latest_release} && #{rake} RAILS_ENV=#{rails_env} #{asset_env} assets:precompile}

      if remote_file_exists?("#{current_path}/REVISION")
        from = source.next_revision(current_revision)
        if capture("cd #{latest_release} && #{source.local.log(from)} vendor/assets/ app/assets/ | wc -l").to_i > 0
          run precompile_command
        else
          logger.info "Skipping asset pre-compilation because there were no asset changes"
        end
      else
        run precompile_command
      end
    end
  end
end

Nice! thnx