svoid tarInJar_withMD5(File jarIn, File jarOut) ctex {
  print("tarInJar_withMD5 " + f2s(jarIn) + " => " + f2s(jarOut));
  File tar = createTempFile("", ".tar");
  print("  temp: " + f2s(tar));
  temp tempDeleteFile(tar);
  zip2tar(jarIn, tar);
  temp ZipOutputStream zipOut = zipOutputStream(jarOut);
  file2zip(zipOut, tar, "bulk-" + md5(tar) + ".tar");
}

svoid tarInJar_withMD5(File jarIn) {
  if (!fileExists(jarIn)) ret;
  File jarOut = fileInSameDirectory(jarIn, dropSuffixIC(".jar", jarIn.getName()) + ".repacked.jar");
  renameFileToUniqueName(jarOut); // backup old version
  tarInJar_withMD5(jarIn, jarOut);
}

svoid tarInJar_withMD5(S jarIn) {
  tarInJar_withMD5(newFile(jarIn));
}