$ git clone -n https://src.fedoraproject.org/rpms/fillets-ng-data.git /var/lib/mock/f45-build-8926-397/root/chroot_tmpdir/scmroot/fillets-ng-data
Cloning into '/var/lib/mock/f45-build-8926-397/root/chroot_tmpdir/scmroot/fillets-ng-data'...
$ git fetch origin 6f7d4972f8ea448750b8ef4778c3185425cc00d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fillets-ng-data
 * [new ref]         6f7d4972f8ea448750b8ef4778c3185425cc00d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6f7d497 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild