Refactor into RenderAgent and ApplyAgent

clitools/pkg/node/kubeadm_upgrade.go

@@ -257,3 +257,95 @@ func describeHealthCheckFailure(ctx context.Context, kubeClient kubernetes.Inter
 
 	return nil
 }
+
+func RunKubeadmUpgradeNode(ctx context.Context, nctx *NodeContext) error {
+	if nctx == nil {
+		return errors.New("node context is nil")
+	}
+	if nctx.Config == nil {
+		return errors.New("node config is nil")
+	}
+	if nctx.LocalClusterState == nil {
+		return errors.New("LocalClusterState is nil. Please run earlier steps first")
+	}
+	if nctx.BootstrapState == nil {
+		return errors.New("BootstrapState is nil. Please run earlier steps first")
+	}
+
+	switch nctx.BootstrapState.Action {
+	case BootstrapActionUpgradeWorker:
+		// continue
+	default:
+		klog.V(4).Infof("RunKubeadmUpgradeNode skipped for action %q", nctx.BootstrapState.Action)
+		return nil
+	}
+
+	wantVersion := normalizeKubeVersion(strings.TrimSpace(nctx.Config.Spec.KubernetesVersion))
+	if wantVersion == "" {
+		return errors.New("spec.kubernetesVersion is required")
+	}
+
+	kubeconfigPath := chooseVersionKubeconfig(nctx.LocalClusterState)
+	if kubeconfigPath == "" {
+		return errors.New("no kubeconfig available for detecting cluster version")
+	}
+
+	clusterVersion := strings.TrimSpace(nctx.BootstrapState.DetectedClusterVersion)
+	if clusterVersion == "" {
+		var err error
+		clusterVersion, err = getServerVersion(ctx, kubeconfigPath)
+		if err != nil {
+			if nctx.BootstrapState.UnsupportedWorkerVersionSkew {
+				klog.Warningf(
+					"cluster version unavailable but worker skew was marked unsupported/permissive, continuing: reason=%s",
+					nctx.BootstrapState.VersionSkewReason,
+				)
+			} else {
+				return fmt.Errorf("get cluster version via %s: %w", kubeconfigPath, err)
+			}
+		}
+	}
+
+	if clusterVersion != "" && !isSupportedWorkerSkew(clusterVersion, wantVersion) {
+		klog.Warningf(
+			"unsupported worker version skew detected, continuing anyway: cluster=%s node=%s",
+			clusterVersion,
+			wantVersion,
+		)
+	}
+
+	klog.Infof(
+		"running kubeadm upgrade node: role=%s clusterVersion=%s nodeVersion=%s kubeconfig=%s",
+		strings.TrimSpace(nctx.Config.Spec.ClusterRole),
+		clusterVersion,
+		wantVersion,
+		kubeconfigPath,
+	)
+
+	args := []string{
+		"upgrade",
+		"node",
+		"--kubeconfig",
+		kubeconfigPath,
+	}
+
+	_, err := nctx.SystemRunner.RunWithOptions(
+		ctx,
+		"kubeadm",
+		args,
+		system.RunOptions{
+			Timeout: 10 * time.Minute,
+			OnStdoutLine: func(line string) {
+				klog.Infof("[kubeadm] %s", line)
+			},
+			OnStderrLine: func(line string) {
+				klog.Infof("[kubeadm] %s", line)
+			},
+		},
+	)
+	if err != nil {
+		return fmt.Errorf("run kubeadm upgrade node: %w", err)
+	}
+
+	return nil
+}