class ChefCLI::Policyfile::CachedCookbook

def validate!
  if cache_key.nil?
    raise CachedCookbookNotFound, "Cookbook `#{name}' does not have a `cache_key` set, cannot locate cookbook"
  end
  unless File.exist?(cookbook_path)
    raise CachedCookbookNotFound, "Cookbook `#{name}' not found at expected cache location `#{cache_key}' (full path: `#{cookbook_path}')"
  end
end