$ git clone -n https://src.fedoraproject.org/rpms/octave-struct.git /var/lib/mock/f42-build-865386-173043/root/chroot_tmpdir/scmroot/octave-struct
Cloning into '/var/lib/mock/f42-build-865386-173043/root/chroot_tmpdir/scmroot/octave-struct'...
$ git fetch origin 7c7d1e3d73e8da14b16dc18757ceb77e7a9d118d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octave-struct
 * [new ref]         7c7d1e3d73e8da14b16dc18757ceb77e7a9d118d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7c7d1e3 Rebuild for octave 9.2