$ git clone -n https://src.fedoraproject.org/rpms/realtime-setup.git /var/lib/mock/f45-build-34388-685/root/chroot_tmpdir/scmroot/realtime-setup
Cloning into '/var/lib/mock/f45-build-34388-685/root/chroot_tmpdir/scmroot/realtime-setup'...
$ git fetch origin 5390581b75eaf6e6e484b18545996ba4f40e7158:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/realtime-setup
 * [new ref]         5390581b75eaf6e6e484b18545996ba4f40e7158 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5390581 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild