$ git clone -n https://src.fedoraproject.org/rpms/R-deldir.git /var/lib/mock/f40-build-789334-135726/root/chroot_tmpdir/scmroot/R-deldir
Cloning into '/var/lib/mock/f40-build-789334-135726/root/chroot_tmpdir/scmroot/R-deldir'...
$ git fetch origin b3b0125a1cbfb260fe1fc6f3486fc245f1c1fda6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-deldir
 * [new ref]         b3b0125a1cbfb260fe1fc6f3486fc245f1c1fda6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3b0125 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild