$ git clone -n https://src.fedoraproject.org/rpms/python-nbxmpp.git /var/lib/mock/f41-build-side-2-python-2706178-30419/root/chroot_tmpdir/scmroot/python-nbxmpp
Cloning into '/var/lib/mock/f41-build-side-2-python-2706178-30419/root/chroot_tmpdir/scmroot/python-nbxmpp'...
$ git fetch origin a10934a10ad6ac816eeaf738008d8ad3d7ffad61:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-nbxmpp
 * [new ref]         a10934a10ad6ac816eeaf738008d8ad3d7ffad61 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a10934a Update to 4.5.4