$ git clone -n https://src.fedoraproject.org/rpms/R-R.utils.git /var/lib/mock/f45-build-5914-345/root/chroot_tmpdir/scmroot/R-R.utils
Cloning into '/var/lib/mock/f45-build-5914-345/root/chroot_tmpdir/scmroot/R-R.utils'...
$ git fetch origin 32948505c3b793d97046bbcd1197a47f619592fe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-R.utils
 * [new ref]         32948505c3b793d97046bbcd1197a47f619592fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3294850 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild