$ git clone -n https://src.fedoraproject.org/rpms/octave-specfun.git /var/lib/mock/f45-build-20841-574/root/chroot_tmpdir/scmroot/octave-specfun
Cloning into '/var/lib/mock/f45-build-20841-574/root/chroot_tmpdir/scmroot/octave-specfun'...
$ git fetch origin 9863b44b13f3c4c62ab81edc8166c6d192a40d06:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octave-specfun
 * [new ref]         9863b44b13f3c4c62ab81edc8166c6d192a40d06 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9863b44 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild