$ git clone -n https://src.fedoraproject.org/rpms/fillets-ng-data.git /var/lib/mock/f41-build-1199892-22404/root/chroot_tmpdir/scmroot/fillets-ng-data
Cloning into '/var/lib/mock/f41-build-1199892-22404/root/chroot_tmpdir/scmroot/fillets-ng-data'...
$ git fetch origin fda5371a673758735945c28accceb5d92979e66d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fillets-ng-data
 * [new ref]         fda5371a673758735945c28accceb5d92979e66d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fda5371 Eliminate use of obsolete %patchN syntax (#2283636)