$ git clone -n https://src.fedoraproject.org/rpms/python-jupyter-server.git /var/lib/mock/f40-build-2120824-50739/root/chroot_tmpdir/scmroot/python-jupyter-server
Cloning into '/var/lib/mock/f40-build-2120824-50739/root/chroot_tmpdir/scmroot/python-jupyter-server'...
$ git fetch origin 5d3e8cd28b086bc42a2da3c697e31813e0b1d964:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-jupyter-server
 * [new ref]         5d3e8cd28b086bc42a2da3c697e31813e0b1d964 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d3e8cd Update to 2.12.1 (rhbz#2253103)