$ git clone -n https://src.fedoraproject.org/rpms/firewalld.git /var/lib/mock/f40-build-1996435-44014/root/chroot_tmpdir/scmroot/firewalld
Cloning into '/var/lib/mock/f40-build-1996435-44014/root/chroot_tmpdir/scmroot/firewalld'...
$ git fetch origin b76f2a4fa503b21173876f9a6bfa06440188ebe7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/firewalld
 * [new ref]         b76f2a4fa503b21173876f9a6bfa06440188ebe7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b76f2a4 rebase to v2.0.2