feat(system): add MaskUnit to systemd

system/systemd.go

@@ -165,3 +165,11 @@ func MachineID(root string) string {
 
 	return id
 }
+
+func MaskUnit(unit string, root string) error {
+	masked := path.Join(root, "etc", "systemd", "system", unit)
+	if err := os.MkdirAll(path.Dir(masked), os.FileMode(0755)); err != nil {
+		return err
+	}
+	return os.Symlink("/dev/null", masked)
+}