$ git clone -n https://src.fedoraproject.org/rpms/lujavrite.git /var/lib/mock/f45-build-17725-503/root/chroot_tmpdir/scmroot/lujavrite
Cloning into '/var/lib/mock/f45-build-17725-503/root/chroot_tmpdir/scmroot/lujavrite'...
$ git fetch origin 012124a9dbc68f7c01df499bd48d3f46526d4e4e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lujavrite
 * [new ref]         012124a9dbc68f7c01df499bd48d3f46526d4e4e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 012124a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild