$ git clone -n https://src.fedoraproject.org/rpms/R-utf8.git /var/lib/mock/f38-build-side-42-init-devel-966434-28808/root/chroot_tmpdir/scmroot/R-utf8
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-966434-28808/root/chroot_tmpdir/scmroot/R-utf8'...
$ git fetch origin dec9a472ca141fb046b67e937fcd6fa1f40862d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-utf8
 * [new ref]         dec9a472ca141fb046b67e937fcd6fa1f40862d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dec9a47 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild