public static void setup(@Nullable Integer machNamespaceUid) {
    if (!isMac()) {
      throw new IllegalStateException("macOS only");
    }

    if (machNamespaceUid != null) {
      tryRun(() -> machMoveToUserNamespace(machNamespaceUid), "Failed to move to namespace of UID " + machNamespaceUid);
    }
  }
public static void setup(@Nullable Integer machNamespaceUid)