labs: wait for namespaces and interfaces

When setting up neutron router and DHCP, the time until namespaces and
interfaces are ready varies a lot (from less than a second to five
seconds and more), even on the same host system. If it takes longer, we
proceed too early which leaves the cluster misconfigured. In that case,
nova instances fail to get a DHCP address.

This patch makes sure the script waits until the interfaces are ready.

Change-Id: I346a098062d984956cf496e89f9ada2a38df0569

labs/scripts/setup_neutron_network.sh

@@ -135,7 +135,56 @@ iniset_sudo $conf DEFAULT verbose True
 echo "Restarting the network service."
 sudo service neutron-plugin-openvswitch-agent restart
 sudo service neutron-l3-agent restart
+
+echo -n "Getting router namespace."
+nsrouter=$(ip netns|grep qrouter)
+while [ : ]; do
+    nsrouter=$(ip netns|grep qrouter)
+    if [ -n "$nsrouter" ]; then
+        echo
+        echo "Router namespace: $nsrouter"
+        break
+    fi
+    echo -n "."
+    sleep 1
+done
+
 sudo service neutron-dhcp-agent restart
+
+echo -n "Getting DHCP namespace."
+while [ : ]; do
+    nsdhcp=$(ip netns|grep qdhcp)
+    if [ -n "$nsdhcp" ]; then
+        echo
+        echo "DHCP namespace: $nsdhcp"
+        break
+    fi
+    echo -n "."
+    sleep 1
+done
+
+echo -n "Waiting for interfaces qr-*, qg-* in router namespace."
+while [ : ]; do
+    ifaces=$(sudo ip netns exec "$nsrouter" ip addr)
+    if [[ $ifaces == *:\ qr-* && $ifaces == *:\ qg-* ]]; then
+        echo
+        break
+    fi
+    echo -n "."
+    sleep 1
+done
+
+echo -n "Waiting for interface tap* in DHCP namespace."
+while [ : ]; do
+    ifaces=$(sudo ip netns exec "$nsdhcp" ip addr)
+    if [[ $ifaces == *:\ tap* ]]; then
+        echo
+        break
+    fi
+    echo -n "."
+    sleep 1
+done
+
 sudo service neutron-metadata-agent restart
 
 echo "Restarting the OVS agent."