Multiple services

[srid]

cf. "This also solves the problem of only being able to run one instance at a time." of cachix/devenv#75

Consider this scenario

passetto adds a postgresql service. But the user (nammayatri) may add their own postgresql service. Can the two DB coexist?

What we can do

Should we adjust the module API to accomodate for this? For eg., instead of:

services.postgresql.enable = true;

do we instead do:

services.postgresql."some-name".enable = true;

And consistently use this API for all services?

Concrete goal

This should work in nammayatri which has its own postgresql, as well as a postgres db used for passeto.

[shivaraj-bh]

This makes sense! I think we can already do this if we have a different dataDir and serve on a different port.

[srid]

It would look more like this,

services.postgresql = lib.mkOption {
  type = types.submodule ({name, ...}: {
    options = {
      dataDir = lib.mkOption {
        type = types.str;
        default = "./data/${name}";
      };
    }
  });
}

Note how dataDir's default is determined from the attrset key (name).