$ git clone -n https://src.fedoraproject.org/rpms/R-sp.git /var/lib/mock/f45-build-6430-348/root/chroot_tmpdir/scmroot/R-sp
Cloning into '/var/lib/mock/f45-build-6430-348/root/chroot_tmpdir/scmroot/R-sp'...
$ git fetch origin 0e89cbbb35b11bcd683be11ddc2586ee2db8ef60:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-sp
 * [new ref]         0e89cbbb35b11bcd683be11ddc2586ee2db8ef60 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0e89cbb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild