search_dir

# File activesupport/lib/active_support/cache/file_store.rb, line 164
        def search_dir(dir, &callback)
          return if !File.exist?(dir)
          Dir.foreach(dir) do |d|
            next if d.in?(EXCLUDED_DIRS)
            name = File.join(dir, d)
            if File.directory?(name)
              search_dir(name, &callback)
            else
              callback.call name
            end
          end
        end