$ git clone -n https://src.fedoraproject.org/rpms/plasma-firewall.git /var/lib/mock/f40-build-788664-135301/root/chroot_tmpdir/scmroot/plasma-firewall
Cloning into '/var/lib/mock/f40-build-788664-135301/root/chroot_tmpdir/scmroot/plasma-firewall'...
$ git fetch origin 4f056a32b8a662d9426c5c46896709d1edd7be9f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-firewall
 * [new ref]         4f056a32b8a662d9426c5c46896709d1edd7be9f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4f056a3 6.0.0