Added some ctl boilerplate

clitools/pkg/cmd/checkconfig/checkconfig.go

@@ -0,0 +1,30 @@
+package checkconfig
+
+import (
+	"fmt"
+
+	"undecided.project/monok8s/pkg/config"
+	"github.com/spf13/cobra"
+)
+
+func NewCmdCheckConfig() *cobra.Command {
+	var configPath string
+	cmd := &cobra.Command{
+		Use:   "checkconfig",
+		Short: "Validate a MonoKSConfig",
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			path, err := (config.Loader{}).ResolvePath(configPath)
+			if err != nil {
+				return err
+			}
+			cfg, err := (config.Loader{}).Load(path)
+			if err != nil {
+				return err
+			}
+			fmt.Fprintf(cmd.OutOrStdout(), "OK: %s (%s / %s)\n", path, cfg.Spec.NodeName, cfg.Spec.KubernetesVersion)
+			return nil
+		},
+	}
+	cmd.Flags().StringVarP(&configPath, "config", "c", "", "path to MonoKSConfig yaml")
+	return cmd
+}