$ git clone -n https://src.fedoraproject.org/rpms/iptables.git /var/lib/mock/f42-build-867447-175505/root/chroot_tmpdir/scmroot/iptables
Cloning into '/var/lib/mock/f42-build-867447-175505/root/chroot_tmpdir/scmroot/iptables'...
$ git fetch origin 43696a4be35ecb64b596d1db368cb736a91316e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/iptables
 * [new ref]         43696a4be35ecb64b596d1db368cb736a91316e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 43696a4 Keep alternatives symlinks under /usr/sbin