func (imdb *ImageDataBase) loadFile(filename string, logger *log.Logger) error {
pathname := path.Join(imdb.baseDir, filename)
file, err := os.Open(pathname)
if err != nil {
return err
}
defer file.Close()
reader := fsutil.NewChecksumReader(file)
decoder := gob.NewDecoder(reader)
var image image.Image
if err := decoder.Decode(&image); err != nil {
return err
}
if err := reader.VerifyChecksum(); err != nil {
if err == fsutil.ErrorChecksumMismatch {
logger.Printf("Checksum mismatch for image: %s\n", filename)
return nil
}
if err != io.EOF {
return err
}
}
image.FileSystem.RebuildInodePointers()
if err := image.Verify(); err != nil {
return err
}
imdb.Lock()
defer imdb.Unlock()
if imdb.scheduleExpiration(&image, filename) {
imdb.logger.Printf("Deleting already expired image: %s\n", filename)
return os.Remove(pathname)
}
imdb.imageMap[filename] = &image
return nil
}
func (imdb *ImageDataBase) readDirectoryMetadata(dirname string) (
image.DirectoryMetadata, error) {
file, err := os.Open(path.Join(imdb.baseDir, dirname, metadataFile))
if err != nil {
if os.IsNotExist(err) {
return image.DirectoryMetadata{}, nil
}
return image.DirectoryMetadata{}, err
}
defer file.Close()
reader := fsutil.NewChecksumReader(file)
decoder := gob.NewDecoder(reader)
metadata := image.DirectoryMetadata{}
if err := decoder.Decode(&metadata); err != nil {
return image.DirectoryMetadata{}, fmt.Errorf(
"unable to read directory metadata for \"%s\": %s", dirname, err)
}
return metadata, reader.VerifyChecksum()
}