$ git clone -n https://src.fedoraproject.org/rpms/cepces.git /var/lib/mock/f45-build-3837-327/root/chroot_tmpdir/scmroot/cepces
Cloning into '/var/lib/mock/f45-build-3837-327/root/chroot_tmpdir/scmroot/cepces'...
$ git fetch origin 9d26318591d3ae1bd21b83a7b2edc51850afded0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cepces
 * [new ref]         9d26318591d3ae1bd21b83a7b2edc51850afded0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9d26318 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild