#!/bin/bash
 #
 # Copyright 2015 Hewlett-Packard Development Company, L.P.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may
 # not use this file except in compliance with the License. You may obtain
 # a copy of the License at
 #
 #    http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # License for the specific language governing permissions and limitations
 # under the License.
 
 # Ping a neutron guest using a network namespace probe
 
 set -o errexit
 set -o pipefail
 
 TOP_DIR=$(cd $(dirname "$0")/.. && pwd)
 
 # This *must* be run as the admin tenant
 source $TOP_DIR/openrc admin admin
 
 function usage {
     cat - <<EOF
 ping_neutron.sh <net_name> [ping args]
 
 This provides a wrapper to ping neutron guests that are on isolated
 tenant networks that the caller can't normally reach. It does so by
 creating a network namespace probe.
 
 It takes arguments like ping, except the first arg must be the network
 name.
 
 Note: in environments with duplicate network names, the results are
 non deterministic.
 
 This should *really* be in the neutron cli.
 
 EOF
     exit 1
 }
 
 NET_NAME=$1
 
 if [[ -z "$NET_NAME" ]]; then
     echo "Error: net_name is required"
     usage
 fi
 

 REMAINING_ARGS="${@:2}"

 
 # BUG: with duplicate network names, this fails pretty hard.

 NET_ID=$(neutron net-list | grep "$NET_NAME" | awk '{print $2}')

 PROBE_ID=$(neutron-debug probe-list -c id -c network_id | grep "$NET_ID" | awk '{print $2}' | head -n 1)
 
 # This runs a command inside the specific netns
 NET_NS_CMD="ip netns exec qprobe-$PROBE_ID"
 

 PING_CMD="sudo $NET_NS_CMD ping $REMAINING_ARGS"

 echo "Running $PING_CMD"
 $PING_CMD