$ git clone -n https://src.fedoraproject.org/rpms/octave-optim.git /var/lib/mock/f42-build-865438-173130/root/chroot_tmpdir/scmroot/octave-optim
Cloning into '/var/lib/mock/f42-build-865438-173130/root/chroot_tmpdir/scmroot/octave-optim'...
$ git fetch origin b6aba447fd80c942b0ffdd2b0c0169563d3a4112:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octave-optim
 * [new ref]         b6aba447fd80c942b0ffdd2b0c0169563d3a4112 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6aba44 Rebuild for octave 9.2