class KPM::SystemProxy::DiskSpaceInformation

def fetch(data_keys)
  disk_space_info = nil
  if OS.windows?
    disk_space_info = fetch_windows(data_keys)
  elsif OS.linux?
    disk_space_info = fetch_linux_mac(5, data_keys)
  elsif OS.mac?
    disk_space_info = fetch_linux_mac(8, data_keys)
  end
  disk_space_info
end