$ git clone -n https://src.fedoraproject.org/rpms/octave-flexiblas.git /var/lib/mock/f40-build-2265462-54600/root/chroot_tmpdir/scmroot/octave-flexiblas
Cloning into '/var/lib/mock/f40-build-2265462-54600/root/chroot_tmpdir/scmroot/octave-flexiblas'...
$ git fetch origin 39e77196e34a70b3d494d4b353e45e8a0fbe461c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octave-flexiblas
 * [new ref]         39e77196e34a70b3d494d4b353e45e8a0fbe461c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39e7719 Update to 3.4.0