func (cs *SubsysInfo) WriteTo(b *strings.Builder, off bool) {
	cs.AddEnvString(b)
	if off {
		b.WriteString(KvComment)
		b.WriteString(KvSpaceSeparator)
	}
	b.WriteString(cs.SubSys)
	if cs.Target != Default {
		b.WriteString(SubSystemSeparator)
		b.WriteString(cs.Target)
	}
	b.WriteString(KvSpaceSeparator)
	for _, kv := range cs.Config {