$ git clone -n https://src.fedoraproject.org/rpms/R-import.git /var/lib/mock/f45-build-6176-346/root/chroot_tmpdir/scmroot/R-import
Cloning into '/var/lib/mock/f45-build-6176-346/root/chroot_tmpdir/scmroot/R-import'...
$ git fetch origin 60f3a404f31122cbd00592c383599ea0dcf11b60:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-import
 * [new ref]         60f3a404f31122cbd00592c383599ea0dcf11b60 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 60f3a40 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild