Added some ctl boilerplate

clitools/pkg/cmd/agent/agent.go

@@ -0,0 +1,51 @@
+package agent
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	monov1alpha1 "undecided.project/monok8s/pkg/apis/monok8s/v1alpha1"
+	"undecided.project/monok8s/pkg/kube"
+	"github.com/spf13/cobra"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/cli-runtime/pkg/genericclioptions"
+	"k8s.io/klog/v2"
+)
+
+func NewCmdAgent(flags *genericclioptions.ConfigFlags) *cobra.Command {
+	var namespace string
+	cmd := &cobra.Command{
+		Use:   "agent",
+		Short: "Watch OSUpgrade resources and do nothing for now",
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			clients, err := kube.NewClients(flags)
+			if err != nil {
+				return err
+			}
+			gvr := schema.GroupVersionResource{Group: monov1alpha1.Group, Version: monov1alpha1.Version, Resource: "osupgrades"}
+			ctx := cmd.Context()
+			for {
+				list, err := clients.Dynamic.Resource(gvr).Namespace(namespace).List(ctx, metav1.ListOptions{})
+				if err != nil {
+					return err
+				}
+				klog.InfoS("agent tick", "namespace", namespace, "items", len(list.Items))
+				for _, item := range list.Items {
+					klog.InfoS("observed osupgrade", "name", item.GetName(), "resourceVersion", item.GetResourceVersion())
+				}
+				select {
+				case <-ctx.Done():
+					return ctx.Err()
+				case <-time.After(15 * time.Second):
+				}
+			}
+		},
+	}
+	cmd.Flags().StringVar(&namespace, "namespace", "kube-system", "namespace to watch")
+	return cmd
+}
+
+var _ = context.Background
+var _ = fmt.Sprintf