```ruby
require 'thor'
require 'yaml'
require 'json'
require 'travis/worker'

module Travis
  module Worker
    module Cli
      class Vagrant < Thor
        class << self
          def config
            Travis::Worker::Vagrant.config
          end
        end

        namespace "travis:worker:vagrant"

        include Cli

        desc 'rebuild', 'Rebuild all worker vms'
        method_option :from, :default => config.base
        def rebuild
          vbox.reset

          download
          add_box from, :to => 'base'
          exit unless up 'base'
          package 'base'

          1.upto(config.workers) do |num|
            add_box 'base', :to => "worker-#{num}"
          end
          up
        end

        protected

          def vbox
            @vbox ||= Vbox.new
          end

          def config
            self.class.config
          end

          def from
            options['from']
          end

          def download
            run "get http://files.vagrantup.com/#{from}.box" unless File.exists?("#{from}.box")
          end

          def add_box(name, options = {})
            run "vagrant box add #{options[:to] || name} #{name}.box"
          end

          def up(name = nil)
            run "vagrant up #{name}"
          end

          def package(name)
            run "rm -rf #{name}.box"
            run "vagrant package --base #{uuid}"
            run "mv package.box #{name}.box"
          end

          def uuid
            vms = JSON.parse(File.read('.vagrant'))
            vms['active']['base'] || raise("could not find base uuid in #{vms.inspect}")
          end
      end
    end
  end
end
```

Use wget to download Vagrant base box
user
```ruby
require 'thor'
require 'yaml'
require 'json'
require 'travis/worker'

module Travis
  module Worker
    module Cli
      class Vagrant < Thor
        class << self
          def config
            Travis::Worker::Vagrant.config
          end
        end

        namespace "travis:worker:vagrant"

        include Cli

        desc 'rebuild', 'Rebuild all worker vms'
        method_option :from, :default => config.base
        def rebuild
          vbox.reset

          download
          add_box from, :to => 'base'
          exit unless up 'base'
          package 'base'

          1.upto(config.workers) do |num|
            add_box 'base', :to => "worker-#{num}"
          end
          up
        end

        protected

          def vbox
            @vbox ||= Vbox.new
          end

          def config
            self.class.config
          end

          def from
            options['from']
          end

          def download
            run "wget http://files.vagrantup.com/#{from}.box" unless File.exists?("#{from}.box")
          end

          def add_box(name, options = {})
            run "vagrant box add #{options[:to] || name} #{name}.box"
          end

          def up(name = nil)
            run "vagrant up #{name}"
          end

          def package(name)
            run "rm -rf #{name}.box"
            run "vagrant package --base #{uuid}"
            run "mv package.box #{name}.box"
          end

          def uuid
            vms = JSON.parse(File.read('.vagrant'))
            vms['active']['base'] || raise("could not find base uuid in #{vms.inspect}")
          end
      end
    end
  end
end
```
assistant