$ git clone -n https://src.fedoraproject.org/forks/zbyszek/rpms/iptables.git /var/lib/mock/f42-build-59099940-6571021/root/chroot_tmpdir/scmroot/iptables
Cloning into '/var/lib/mock/f42-build-59099940-6571021/root/chroot_tmpdir/scmroot/iptables'...
$ git fetch origin 9b74fed687d0ca9cbaa47e04527c7fb251c89b38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/zbyszek/rpms/iptables
 * [new ref]         9b74fed687d0ca9cbaa47e04527c7fb251c89b38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b74fed Revert "Keep alternatives symlinks under /usr/sbin"