// return json file listing for given image id
// Download the specified layer and determine the file contents. If the cache already exists, just return it.
func GetImageFilesJson(s storage.Storage, imageID string) ([]byte, error) {
// if the files json exists in the cache, return it
filesJson, err := GetImageFilesCache(s, imageID)
if err != nil {
return filesJson, nil
}
// cache doesn't exist. download remote layer
// docker-registry 0.6.5 has an lzma decompress here. it actually doesn't seem to be used so i've omitted it
// will add it later if need be.
tarFilesInfo := NewTarFilesInfo()
if reader, err := s.GetReader(storage.ImageLayerPath(imageID)); err != nil {
return nil, err
} else if err := tarFilesInfo.Load(reader); err != nil {
return nil, err
}
return tarFilesInfo.Json()
}
