$ git clone -n https://src.fedoraproject.org/rpms/python-jupyter-server.git /var/lib/mock/f39-build-1698534-41184/root/chroot_tmpdir/scmroot/python-jupyter-server
Cloning into '/var/lib/mock/f39-build-1698534-41184/root/chroot_tmpdir/scmroot/python-jupyter-server'...
$ git fetch origin cc4479be6b0d521c0e361d52a418cbdb7488b4be:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-jupyter-server
 * [new ref]         cc4479be6b0d521c0e361d52a418cbdb7488b4be -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc4479b Update to 2.7.2 (rhbz#2232114)