code: public void create(@Nonnull QEmuImageFormat format, @Nonnegative long size) throws IOException {
          ProcessBuilder builder = new ProcessBuilder("qemu-img", "create", "-f", format.name(), file.getAbsolutePath(), String.valueOf(size));
          Process process = builder.start();
          ByteStreams.copy(process.getInputStream(), System.err);
      }
docs: Creates this image.
  
  @param format The image format for the new image.
  @param size The virtual size of the new image.