gistfile1.rb

namespace :web do 
    desc "Custom task to disable web"
    task :disable, :roles => :web, :except => {:no_release => true} do
      require 'erb'
      on_rollback {run "rm #{shared_path}/system/maintenance.html"}
      template = File.read(File.join(File.dirname(__FILE__), "deploy", "templates", "maintenance.html.erb"))
      result = ERB.new(template).result(binding)
      put result, "#{shared_path}/system/maintenance.html", :mode => 0644
    end
end