# File lib/deltacloud/drivers/mock/mock_driver.rb, line 91
    def initialize
      if ENV["DELTACLOUD_MOCK_STORAGE"]
        storage_root = ENV["DELTACLOUD_MOCK_STORAGE"]
      elsif Etc.getlogin
        storage_root = File::join("/var/tmp", "deltacloud-mock-#{ENV["USER"]}")
      else
        raise "Please set either the DELTACLOUD_MOCK_STORAGE or USER environment variable"
      end
      @client = Client.new(storage_root)
    end