$ git clone -n https://src.fedoraproject.org/rpms/rats.git /var/lib/mock/f45-build-34332-684/root/chroot_tmpdir/scmroot/rats
Cloning into '/var/lib/mock/f45-build-34332-684/root/chroot_tmpdir/scmroot/rats'...
$ git fetch origin 83d6d57c974a3f83db37fffb274d3c00f9fe13e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rats
 * [new ref]         83d6d57c974a3f83db37fffb274d3c00f9fe13e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83d6d57 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild