code: public void makePublic() {
          if (!getPublicMarkerFile().exists()) {
              try {
                  new FileOutputStream(getPublicMarkerFile()).close();
              } catch (IOException e) {
                  throw Exceptions.handle(Storage.LOG, e);
              }
          }
          publicAccessCache.put(getName(), true);
      }
docs: Marks the bucket as public accessible.