$ git clone -n https://src.fedoraproject.org/rpms/librttopo.git /var/lib/mock/f45-build-16916-493/root/chroot_tmpdir/scmroot/librttopo
Cloning into '/var/lib/mock/f45-build-16916-493/root/chroot_tmpdir/scmroot/librttopo'...
$ git fetch origin e594c0547dbbe67ae4f62547f8ee5393408d497e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/librttopo
 * [new ref]         e594c0547dbbe67ae4f62547f8ee5393408d497e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e594c05 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild