$ git clone -n https://src.fedoraproject.org/rpms/R-forcats.git /var/lib/mock/f45-build-6080-346/root/chroot_tmpdir/scmroot/R-forcats
Cloning into '/var/lib/mock/f45-build-6080-346/root/chroot_tmpdir/scmroot/R-forcats'...
$ git fetch origin 07690c692f5c607ce4741662f80390f99fe1ced9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-forcats
 * [new ref]         07690c692f5c607ce4741662f80390f99fe1ced9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 07690c6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild