$ git clone -n https://src.fedoraproject.org/rpms/ristretto.git /var/lib/mock/f45-build-34555-688/root/chroot_tmpdir/scmroot/ristretto
Cloning into '/var/lib/mock/f45-build-34555-688/root/chroot_tmpdir/scmroot/ristretto'...
$ git fetch origin c82aba4d58842b2eaafef52061aed054e8b58cc0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ristretto
 * [new ref]         c82aba4d58842b2eaafef52061aed054e8b58cc0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c82aba4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild