$ git clone -n https://src.fedoraproject.org/rpms/octave-flexiblas.git /var/lib/mock/f45-build-20832-574/root/chroot_tmpdir/scmroot/octave-flexiblas
Cloning into '/var/lib/mock/f45-build-20832-574/root/chroot_tmpdir/scmroot/octave-flexiblas'...
$ git fetch origin fca8af9735f1465bc28703c18d2b348d30bc441d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octave-flexiblas
 * [new ref]         fca8af9735f1465bc28703c18d2b348d30bc441d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fca8af9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild