@NotNull
 private String createRemoteFile(
     @NotNull ObjectId id, @NotNull ObjectLoader loader, @NotNull Uploader uploader)
     throws IOException {
   // Create LFS stream.
   final String hash;
   final String cached = cacheSha256.get(id.name());
   long size = 0;
   if (cached == null) {
     final MessageDigest md = createSha256();
     try (InputStream istream = loader.openStream()) {
       byte[] buffer = new byte[0x10000];
       while (true) {
         int read = istream.read(buffer);
         if (read <= 0) break;
         md.update(buffer, 0, read);
         size += read;
       }
     }
     hash = new String(Hex.encodeHex(md.digest(), true));
     cacheSha256.put(id.name(), hash);
     cache.commit();
   } else {
     hash = cached;
   }
   uploader.upload(id, new Meta(hash, size));
   return hash;
 }
 @NotNull
 private String createLocalFile(@NotNull ObjectId id, @NotNull ObjectLoader loader)
     throws IOException {
   // Create LFS stream.
   final File tmpFile = new File(tempPath, UUID.randomUUID().toString());
   final MessageDigest md = createSha256();
   try (InputStream istream = loader.openStream();
       OutputStream ostream = new FileOutputStream(tmpFile)) {
     byte[] buffer = new byte[0x10000];
     while (true) {
       int size = istream.read(buffer);
       if (size <= 0) break;
       ostream.write(buffer, 0, size);
       md.update(buffer, 0, size);
     }
   }
   final String hash = new String(Hex.encodeHex(md.digest(), true));
   cacheSha256.putIfAbsent(id.name(), hash);
   cache.commit();
   // Rename file.
   final File lfsFile =
       new File(
           basePath,
           "lfs/objects/" + hash.substring(0, 2) + "/" + hash.substring(2, 4) + "/" + hash);
   makeParentDirs(lfsFile.getParentFile());
   if (lfsFile.exists()) {
     if (!tmpFile.delete()) {
       log.warn("Can't delete temporary file: {}", lfsFile.getAbsolutePath());
     }
   } else if (!tmpFile.renameTo(lfsFile)) {
     throw new IOException("Can't rename file: " + tmpFile + " -> " + lfsFile);
   }
   return hash;
 }
 @NotNull
 private InputStream openAttributes(@NotNull ObjectReader reader, @Nullable ObjectId id)
     throws IOException {
   if (ObjectId.zeroId().equals(id)) {
     return new ByteArrayInputStream(new byte[0]);
   }
   return reader.open(id, Constants.OBJ_BLOB).openStream();
 }