$ git clone -n https://src.fedoraproject.org/rpms/R-desc.git /var/lib/mock/f40-build-2206802-52067/root/chroot_tmpdir/scmroot/R-desc
Cloning into '/var/lib/mock/f40-build-2206802-52067/root/chroot_tmpdir/scmroot/R-desc'...
$ git fetch origin 933031d1baeac8590c37cfc45afb16327bdcdbf2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-desc
 * [new ref]         933031d1baeac8590c37cfc45afb16327bdcdbf2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 933031d Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild