$ git clone -n https://src.fedoraproject.org/rpms/octave-flexiblas.git /var/lib/mock/f39-build-2083829-49966/root/chroot_tmpdir/scmroot/octave-flexiblas
Cloning into '/var/lib/mock/f39-build-2083829-49966/root/chroot_tmpdir/scmroot/octave-flexiblas'...
$ git fetch origin b54f18a81c8e1606a5ad2a9d1446684325220267:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octave-flexiblas
 * [new ref]         b54f18a81c8e1606a5ad2a9d1446684325220267 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b54f18a Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild