$ git clone -n https://src.fedoraproject.org/rpms/ffsb.git /var/lib/mock/f45-build-8945-397/root/chroot_tmpdir/scmroot/ffsb
Cloning into '/var/lib/mock/f45-build-8945-397/root/chroot_tmpdir/scmroot/ffsb'...
$ git fetch origin b0bbc17ba93a6ef8dd274d40b630442adb88199e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ffsb
 * [new ref]         b0bbc17ba93a6ef8dd274d40b630442adb88199e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0bbc17 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild