$ git clone -n https://src.fedoraproject.org/rpms/R-R.cache.git /var/lib/mock/f40-build-2270324-54805/root/chroot_tmpdir/scmroot/R-R.cache
Cloning into '/var/lib/mock/f40-build-2270324-54805/root/chroot_tmpdir/scmroot/R-R.cache'...
$ git fetch origin 3d8f8761a70d07c8fb7bba77227afcbbdb707ece:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-R.cache
 * [new ref]         3d8f8761a70d07c8fb7bba77227afcbbdb707ece -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d8f876 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild