$ git clone -n https://src.fedoraproject.org/rpms/R-TH-data /var/lib/mock/f39-build-1586912-38213/root/chroot_tmpdir/scmroot/R-TH-data
Cloning into '/var/lib/mock/f39-build-1586912-38213/root/chroot_tmpdir/scmroot/R-TH-data'...
$ git fetch origin c862b7e457b9dee8c2902c334a5dcc0568703a79:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-TH-data
 * [new ref]         c862b7e457b9dee8c2902c334a5dcc0568703a79 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c862b7e Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild