$ git clone -n https://src.fedoraproject.org/rpms/octave.git /var/lib/mock/f39-build-2155972-50919/root/chroot_tmpdir/scmroot/octave
Cloning into '/var/lib/mock/f39-build-2155972-50919/root/chroot_tmpdir/scmroot/octave'...
$ git fetch origin 13a2a5db122bf52cfcf3424e2269aee3783ff6e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octave
 * [new ref]         13a2a5db122bf52cfcf3424e2269aee3783ff6e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 13a2a5d Update to 8.4.0