Fix wwctl overlay mkdir #248.

Added argument testing around this.

internal/app/wwctl/overlay/mkdir/mkdir_test.go

@@ -0,0 +1,21 @@
+package mkdir
+
+import (
+	"testing"
+)
+
+// TestArgsOverlayMkdir is a regression test for 248.
+// One argument should fail, two should succeed.
+func TestArgsOverlayMkdir(t *testing.T) {
+	command := GetCommand()
+
+	err := command.Args(command, []string{"overlay_name"})
+	if err == nil {
+		t.Errorf("one argument to overlay mkdir should fail")
+	}
+
+	err = command.Args(command, []string{"overlay_name", "directory"})
+	if err != nil {
+		t.Errorf("two arguments to overlay mkdir should succeed")
+	}
+}

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

@@ -11,7 +11,7 @@ var (
 		Short:                 "Create a new directory within an Overlay",
 		Long:                  "This command creates a new directory within the Warewulf OVERLAY_NAME.",
 		RunE:                  CobraRunE,
-		Args:                  cobra.MinimumNArgs(3),
+		Args:                  cobra.MinimumNArgs(2),
 	}
 	PermMode int32
 )