$ git clone -n https://src.fedoraproject.org/rpms/span.git /var/lib/mock/f45-build-36270-702/root/chroot_tmpdir/scmroot/span
Cloning into '/var/lib/mock/f45-build-36270-702/root/chroot_tmpdir/scmroot/span'...
$ git fetch origin a4147b1580f47c3be015aeb151384a3795e47931:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/span
 * [new ref]         a4147b1580f47c3be015aeb151384a3795e47931 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a4147b1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild