Wait for worker MCP to start updating only if there are Nodes

Author: mgencur

ci-operator/step-registry/network/mtu-migration/network-mtu-migration-commands.sh

@@ -64,7 +64,11 @@ wait_for_mcp() {
   timeout=${1}
   # Wait until MCO starts applying new machine config to nodes
   log "Waiting for all MachineConfigPools to start updating..."
-  time oc wait mcp --all --for='condition=UPDATING=True' --timeout=300s &>/dev/null
+  # The worker MachineConfigPool gets updated immediately if there are no Nodes.
+  if [[ $(oc get nodes -l node-role.kubernetes.io/worker --no-headers | wc -l) -ne 0 ]]; then
+    time oc wait mcp worker --for='condition=UPDATING=True' --timeout=300s &>/dev/null
+  fi
+  time oc wait mcp master --for='condition=UPDATING=True' --timeout=300s &>/dev/null
 
   log "Waiting for all MachineConfigPools to finish updating..."
   timeout "${timeout}" bash <<EOT