> Perhaps ‘essential-services’ could check whether
> ‘hosts-database-service-type’ is part of the
> ‘operating-system-user-services’.
>
> If it is, it would extend it; if not, it would do nothing.
>
> ‘hosts-database-service-type’ would be part of ‘%base-services’, but
> in the container-with-shared-network case, we’d remove it (in a
> procedure similar to ‘virtualized-operating-system’.)
>
> How does that sound?

This sounds workable. I'll send you an implementation soon.