$ git clone -n https://src.fedoraproject.org/rpms/python-jupyter-server.git /var/lib/mock/f38-build-side-42-init-devel-957480-28786/root/chroot_tmpdir/scmroot/python-jupyter-server
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-957480-28786/root/chroot_tmpdir/scmroot/python-jupyter-server'...
$ git fetch origin b75162016e4a8595d10ca09f1cb341babdae6334:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-jupyter-server
 * [new ref]         b75162016e4a8595d10ca09f1cb341babdae6334 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b751620 Update to 2.1.0 (rhbz#2160608)