Add buffer to wait for ovs pid file

This fixes for cases file not yet generated from start(), but already
required on poststart() in openvswitch-vswitchd.sh.

Add wait condition until file exists.

Change-Id: Iae041046fd6e7e7f991b4cd1aa101c97bcaa150c

openvswitch/Chart.yaml

@@ -15,7 +15,7 @@ apiVersion: v1
 appVersion: v1.0.0
 description: OpenStack-Helm OpenVSwitch
 name: openvswitch
-version: 0.1.13
+version: 0.1.14
 home: http://openvswitch.org
 icon: https://www.openstack.org/themes/openstack/images/project-mascots/Neutron/OpenStack_Project_Neutron_vertical.png
 sources:

openvswitch/templates/bin/_openvswitch-vswitchd.sh.tpl

@@ -109,7 +109,11 @@ function stop () {
 
 function poststart () {
   # This enables the usage of 'ovs-appctl' from neutron-ovs-agent pod.
-
+  until [ -f $OVS_PID ]
+  do
+      echo "Waiting for file $OVS_PID"
+      sleep 1
+  done
   PID=$(cat $OVS_PID)
   OVS_CTL=/run/openvswitch/ovs-vswitchd.${PID}.ctl
   chown {{ .Values.pod.user.nova.uid }}.{{ .Values.pod.user.nova.uid }} ${OVS_CTL}

releasenotes/notes/openvswitch.yaml

@@ -14,5 +14,5 @@ openvswitch:
   - 0.1.11 Add ovn.yaml in values_override, Enable ptcp_port 6640 which needed when use ovn
   - 0.1.12 Replace node-role.kubernetes.io/master with control-plane
   - 0.1.13 Upgrade openvswitch image to latest-ubuntu_focal to fix qos issue
-
+  - 0.1.14 Add buffer before accesses pid file
 ...