$ git clone -n https://src.fedoraproject.org/rpms/octave-quaternion.git /var/lib/mock/f41-build-1303337-23493/root/chroot_tmpdir/scmroot/octave-quaternion
Cloning into '/var/lib/mock/f41-build-1303337-23493/root/chroot_tmpdir/scmroot/octave-quaternion'...
$ git fetch origin bc66cae42ada51a2a8d0a1c8b312c5cb1b6b3977:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octave-quaternion
 * [new ref]         bc66cae42ada51a2a8d0a1c8b312c5cb1b6b3977 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc66cae Eliminate use of obsolete %patchN syntax (#2283636)