static void saveStreamToGZFile(InputStream in, File file) ctex {
  File parentFile = file.getParentFile();
  if (parentFile != null)
    parentFile.mkdirs();
  String tempFileName = file.getPath() + "_temp";
  File tempFile = new File(tempFileName);
  if (tempFile.exists()) try {
    S saveName = tempFileName + ".saved." + now();
    copyFile(tempFile, new File(saveName));
  } catch (Throwable e) { printStackTrace(e); }
  
  FileOutputStream fileOutputStream = newFileOutputStream(tempFile.getPath());
  GZIPOutputStream gos = new GZIPOutputStream(fileOutputStream);
  copyStreamAndCloseAll(in, gos);

  if (file.exists() && !file.delete())
    fail("Can't delete " + file.getPath());

  if (!tempFile.renameTo(file))
    fail("Can't rename " + tempFile + " to " + file);
}

Began life as a copy of #1005539