$ git clone -n https://src.fedoraproject.org/rpms/R-discretization.git /var/lib/mock/f45-build-6070-346/root/chroot_tmpdir/scmroot/R-discretization
Cloning into '/var/lib/mock/f45-build-6070-346/root/chroot_tmpdir/scmroot/R-discretization'...
$ git fetch origin 43c4957350047ab164e8abf2ff69812509ab5a46:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-discretization
 * [new ref]         43c4957350047ab164e8abf2ff69812509ab5a46 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 43c4957 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild