$ git clone -n https://src.fedoraproject.org/rpms/python-jupyterlab-server.git /var/lib/mock/f38-build-side-42-init-devel-593860-26156/root/chroot_tmpdir/scmroot/python-jupyterlab-server
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-593860-26156/root/chroot_tmpdir/scmroot/python-jupyterlab-server'...
$ git fetch origin 47262af3c5096b83d63af7479e9a8ad52d62ba2e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-jupyterlab-server
 * [new ref]         47262af3c5096b83d63af7479e9a8ad52d62ba2e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 47262af Update to 2.19.0 (rhbz#2161301)