As of version 3.12.1, the Python [tarfile](https://docs.python.org/3/library/tarfile.html) library doesn't support xattrs. We use tarfile to implement `ch-image import`, which is also used under the hood by `ch-convert -o ch-image`. Because of this, Charliecloud cannot currently preserve xattrs when converting from any format to `ch-image`. We might consider revising our implementation to use GNU tar, which does have xattr support.