deploy.rb

set :application, "example.com"
set :deploy_to, "/var/www/#{application}"

role :app, "example.com"
role :web, "example.com"
role :db,  "example.com", :primary => true

set :scm, :git
set :repository, "ssh://[email protected]/git/example.com"
set :branch,     "origin/master"
 
namespace :deploy do
  desc "Deploy app"
  task :default do
    update
    restart
    cleanup
  end
 
  desc "Setup a GitHub-style deployment."
  task :setup, :except => { :no_release => true } do
    run "git clone #{repository} #{current_path}"
  end
 
  desc "Update the deployed code."
  task :update_code, :except => { :no_release => true } do
    run "cd #{current_path}; git fetch origin; git reset --hard #{branch}"
  end

  desc "Deploy and run migrations"
  task :migrations, :except => { :no_release => true } do
    update
    migrate
    restart
    cleanup
  end

  desc "Run pending migrations on already deployed code"
  task :migrate, :except => { :no_release => true } do
    run "cd #{current_path}; rake RAILS_ENV=production db:migrate"
  end
 
  namespace :rollback do
    desc "Rollback"
    task :default do
      code
    end
    
    desc "Rollback a single commit."
    task :code, :except => { :no_release => true } do
      set :branch, "HEAD^"
      default
    end
  end
    
  desc "Make all the symlinks"
  task :symlink, :roles => :app, :except => { :no_release => true } do
    set :normal_symlinks, %w(
      public/system
      config/database.yml
    )
    commands = normal_symlinks.map do |path|
      "rm -rf #{current_path}/#{path} && \
       ln -s #{shared_path}/#{path} #{current_path}/#{path}"
    end
    
    # set :weird_symlinks, {
    #   "path_on_disk" => "path_to_symlink"
    # }
    # commands += weird_symlinks.map do |from, to|
    #   "rm -rf #{current_path}/#{to} && \
    #    ln -s #{shared_path}/#{from} #{current_path}/#{to}"
    # end

    # needed for some of the symlinks
    run "mkdir -p #{current_path}/tmp && \
         mkdir -p #{current_path}/public/system && \
         mkdir -p #{current_path}/config"

    run <<-CMD
      cd #{current_path} &&
      #{commands.join(" && ")}
    CMD
  end
  
  # override default tasks to make capistrano happy
  desc "Kick Passenger"
  task :start do
    run "touch #{current_path}/tmp/restart.txt"
  end

  desc "Kick Passenger"
  task :restart do
    stop
    start
  end

  desc "Kick Passenger"
  task :stop do
  end
end