$ git clone -n https://src.fedoraproject.org/rpms/firewalld.git /var/lib/mock/f40-build-1507295-23890/root/chroot_tmpdir/scmroot/firewalld
Cloning into '/var/lib/mock/f40-build-1507295-23890/root/chroot_tmpdir/scmroot/firewalld'...
$ git fetch origin 476e4678398c29ce19a16c0aa08cc6676a488a6e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/firewalld
 * [new ref]         476e4678398c29ce19a16c0aa08cc6676a488a6e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 476e467 rebase to v2.1.3