From 56e4a7de45dea1371237ca96e82eb7790391b3e2 Mon Sep 17 00:00:00 2001
From: Jim Gauld <james.gauld@windriver.com>
Date: Wed, 2 Mar 2022 16:59:48 -0500
Subject: [PATCH] Update kubelet patch restarting script to check running
 version

This adds a version check to kubelet patch restarting script.
This will only restart kubelet if the running kubelet is v1.21.8.

This script requires modification depending on specific kubelet
versions that are actually being patched.

TESTING:
- PASS: Verified restart of kubelet and isolcpus_plugin services
        with designer patch install and remove for only v1.21.8

Story: 2008760
Task: 44541

Signed-off-by: Jim Gauld <james.gauld@windriver.com>
Change-Id: I335f2a2e088ead55d32749c07e217a96d53c09a3
---
 .../scripts/kubelet-restart-example           | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/patch-scripts/EXAMPLE_KUBELET/scripts/kubelet-restart-example b/patch-scripts/EXAMPLE_KUBELET/scripts/kubelet-restart-example
index 79630f8a..dab1c1c1 100644
--- a/patch-scripts/EXAMPLE_KUBELET/scripts/kubelet-restart-example
+++ b/patch-scripts/EXAMPLE_KUBELET/scripts/kubelet-restart-example
@@ -26,6 +26,12 @@
 #
 declare -i GLOBAL_RC=$PATCH_STATUS_OK
 
+#
+# Declare subset of kubernetes versions we want to patch.
+# This is customized for the particular patch.
+#
+declare -a PATCH_RESTART_VERSIONS=( "v1.21.8" )
+
 # kubelet doesn't run on storage nodes
 if is_storage
 then
@@ -38,6 +44,26 @@ then
     systemctl status kubelet.service|grep -q "Active: active (running)"
     if [ $? -eq 0 ]
     then
+        # Obtain current kubelet version
+        KVER=$(kubectl version --short=true 2>/dev/null | grep -oP 'Client Version: \K\S+')
+
+        # Check current kubelet version matches any expected restart versions
+        FOUND=0
+        for val in ${PATCH_RESTART_VERSIONS[@]}; do
+            if [ "${val}" == "${KVER}" ]; then
+                FOUND=1
+                break
+            fi
+        done
+        if [ ${FOUND} -eq 1 ]; then
+            loginfo "$0: Current kubelet ${KVER} found in: ${PATCH_RESTART_VERSIONS[@]}"
+        else
+            # do not restart versions that do not require patching
+            loginfo "$0: Current kubelet ${KVER} not found in" \
+                "${PATCH_RESTART_VERSIONS[@]}, skipping kubelet restart"
+            exit $GLOBAL_RC
+        fi
+
         # issue a systemd daemon-reload once the rpms have been installed
         # and before the processes have been restarted.
         systemctl daemon-reload