$ git clone -n https://src.fedoraproject.org/rpms/libgringotts.git /var/lib/mock/f45-build-16308-484/root/chroot_tmpdir/scmroot/libgringotts
Cloning into '/var/lib/mock/f45-build-16308-484/root/chroot_tmpdir/scmroot/libgringotts'...
$ git fetch origin 46b8219faa4a1a0588b5fa4c679487c050f10620:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgringotts
 * [new ref]         46b8219faa4a1a0588b5fa4c679487c050f10620 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 46b8219 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild