bundler_cap.rb

namespace :bundler do
  task :symlink_vendor do
    shared_gems  = File.join(shared_path,  'vendor/bundler_gems/ruby/1.8')
    release_gems = File.join(release_path, 'vendor/bundler_gems/ruby/1.8')

    cmd = %w(gems specifications).collect do |sub_dir|
      shared_sub_dir = File.join(shared_gems, sub_dir)
      "mkdir -p #{shared_sub_dir} && mkdir -p #{release_gems} && ln -s #{shared_sub_dir} #{release_gems}/#{sub_dir}"
    end.join(' && ')

    run(cmd)
  end

  task :install_bundler do
    gem_name = 'bundler'
    run %{ruby -rubygems -e 'exit(Gem.available?(*ARGV))' #{gem_name} || #{try_sudo} gem install #{gem_name}}
  end

  task :bundle_new_release do
    bundler.symlink_vendor
    run("cd #{release_path} && gem bundle --only #{rails_env}")
  end
end