$ git clone -n https://src.fedoraproject.org/rpms/foobillard.git /var/lib/mock/f45-build-9164-399/root/chroot_tmpdir/scmroot/foobillard
Cloning into '/var/lib/mock/f45-build-9164-399/root/chroot_tmpdir/scmroot/foobillard'...
$ git fetch origin 018c8f2ad9d2a17d0aa1048a28111c210641a779:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/foobillard
 * [new ref]         018c8f2ad9d2a17d0aa1048a28111c210641a779 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 018c8f2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild