$ git clone -n https://src.fedoraproject.org/rpms/python-jupyter-server.git /var/lib/mock/f41-build-774537-13515/root/chroot_tmpdir/scmroot/python-jupyter-server
Cloning into '/var/lib/mock/f41-build-774537-13515/root/chroot_tmpdir/scmroot/python-jupyter-server'...
$ git fetch origin a66685fc246846775455b42c054ad6af42fe1bd5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-jupyter-server
 * [new ref]         a66685fc246846775455b42c054ad6af42fe1bd5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a66685f Update to 2.14.1 (rhbz#2284070)