Simple git deployment over ssh with sudo with rake

Rakefile

require 'net/ssh'

namespace :deploy do

  @host = '111.111.111.111'
  @username  = 'user'
  @port = 2222
  @password = ''
  @destination = ''

  desc 'Deploy to staging'
  task :staging do
    @destination = '/home/project/staging'
    puts "Deploying to staging..."    
    perform
    puts "Done!"
  end

  task :production do
    @destination = '/home/project/public_html'
    puts "Deploying to production..."
    perform
  end

  def perform
    Net::SSH.start(@host, @username, :port => @port) do |ssh|
      deploy_command = [
        "cd #{@destination}",
        "sudo -u project git pull origin master",
      ].join(" && ")

      # open a pty channel to be able to run sudo
      ssh.open_channel do |channel|
        channel.request_pty do |c, success|
          raise "could not request pty" unless success
          channel.exec( deploy_command )
          channel.on_data do |c_, data|
            if data = /\[sudo\]/
              # We don't need password on this server to make sudo
              # channel.send_data(@password + "\n")
            end
            puts data
          end
        end
      end
      ssh.loop
    end
  end
end