Add support for a RESTART_STAMP environment variable that allows for restarting K3s based on whether this variable is changed

Signed-off-by: Chris Kim <oats87g@gmail.com>

Author: Oats87

package/run.sh

@@ -6,4 +6,20 @@ cp -f ${CATTLE_AGENT_EXECUTION_PWD}/k3s /usr/local/bin/k3s
 chmod 755 /usr/local/bin/k3s
 chown root:root /usr/local/bin/k3s
 
-env "INSTALL_K3S_SKIP_DOWNLOAD=true" "INSTALL_K3S_SKIP_SELINUX_RPM=true" "INSTALL_K3S_SELINUX_WARN=true" installer.sh $@
+mkdir -p /var/lib/rancher/k3s
+
+RESTART_STAMP_FILE=/var/lib/rancher/k3s/restart_stamp
+
+if [ -f "${RESTART_STAMP_FILE}" ]; then
+    PRIOR_RESTART_STAMP=$(cat "${RESTART_STAMP_FILE}");
+fi
+
+if [ "${PRIOR_RESTART_STAMP}" != "${RESTART_STAMP}" ]; then
+    FORCE_RESTART=true
+else
+    FORCE_RESTART=false
+fi
+
+env "INSTALL_K3S_FORCE_RESTART=${FORCE_RESTART}" "INSTALL_K3S_SKIP_DOWNLOAD=true" "INSTALL_K3S_SKIP_SELINUX_RPM=true" "INSTALL_K3S_SELINUX_WARN=true" installer.sh $@
+
+echo "${RESTART_STAMP}" > "${RESTART_STAMP_FILE}"