First pass at a rework of the overlay subsystem in Warewulf

internal/app/wwctl/overlay/build/root.go

@@ -5,17 +5,15 @@ import "github.com/spf13/cobra"
 var (
 	baseCmd = &cobra.Command{
 		DisableFlagsInUseLine: true,
-		Use:   "build [OPTIONS] {system|runtime} OVERLAY_NAME",
-		Short: "(Re)build an overlay",
-		Long:  "This command builds a new system or runtime overlay named OVERLAY_NAME.",
-		RunE:  CobraRunE,
-		Args:  cobra.RangeArgs(0, 2),
+		Use:                   "build [OPTIONS] NODENAME...",
+		Short:                 "(Re)build node overlays",
+		Long:                  "This command builds overlays for given nodes.",
+		RunE:                  CobraRunE,
 	}
-	BuildAll bool
 )
 
 func init() {
-	baseCmd.PersistentFlags().BoolVarP(&BuildAll, "all", "a", false, "Build all overlays (runtime and system)")
+	//baseCmd.PersistentFlags().BoolVarP(&BuildAll, "all", "a", false, "Build overlays for all nodes")
 }
 
 // GetRootCommand returns the root cobra.Command for the application.