Capistrano Multi Stage Deploy

deploy.rb

require 'bundler/capistrano'
require 'capistrano/ext/multistage'
require 'capistrano_colors'

set :stages,        %w(staging production)
set :default_stage, "staging"

set :user, "webapp"
set :ssh_option, {:forward_agent => true}
set :application, "application-name"
set :deploy_via, :remote_cache
set :scm, :git
set :use_sudo, false

default_run_options[:pty] = true

namespace :deploy do
  task :start do ; end
  task :stop do ; end
  task :restart, :roles => :app, :except => { :no_release => true } do
    run "#{try_sudo} touch #{File.join(current_path,'tmp','restart.txt')}"
  end

  def surun(command)
    password = fetch(:root_password, Capistrano::CLI.password_prompt("root password: "))
    run("sudo #{command}") do |channel, stream, output|
      channel.send_data("#{password}\n") if output
    end
  end
end

Gemfile

gem 'capistrano', '~> 2.11.2'
gem 'capistrano-ext', '~> 1.2.1'
gem 'capistrano_colors', '~> 0.5.5'

production.rb

set :domain,      "example.com"
set :repository,  "git@github.com:organization-name/repository-name.git"
set :app_dir,     "#{application}"
set :deploy_to,   "/home/webapp/#{app_dir}"
set :branch,      "master"
set :rails_env,   "production"

server "#{domain}", :web, :app, :db, :primary => true

staging.rb

set :domain,      "staging.example.com"
set :repository,  "git@github.com:organization-name/repository-name.git"
set :app_dir,     "#{application}"
set :deploy_to,   "/home/webapp/#{app_dir}"
set :branch,      "development"
set :rails_env,   "staging"

server "#{domain}", :web, :app, :db, :primary => true