JGitFileSystemLock.java

public class JGitFileSystemLock {
...
void physicalLockOnFS() {
   try {
       File file = lockFile.toFile();
       RandomAccessFile raf = new RandomAccessFile(file,
                                                   "rw");
       fileChannel = raf.getChannel();
       physicalLock = fileChannel.lock();
       fileChannel.position(0);
       fileChannel.write(ByteBuffer.wrap("locked".getBytes()));
   } catch (Exception e) {
       LOGGER.error("Error during lock of FS [" + toString() + "]",
                    e);
       throw new RuntimeException(e);
   }
}
}