$ git clone -n https://src.fedoraproject.org/rpms/octave-jsonlab.git /var/lib/mock/f45-build-20830-574/root/chroot_tmpdir/scmroot/octave-jsonlab
Cloning into '/var/lib/mock/f45-build-20830-574/root/chroot_tmpdir/scmroot/octave-jsonlab'...
$ git fetch origin 0446f956db3257b562f60c8e05693e3b4f2734cb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octave-jsonlab
 * [new ref]         0446f956db3257b562f60c8e05693e3b4f2734cb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0446f95 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild