thinking about this more. IT could also do in systemd.nix's config section:

systemd.services.*.environment.PATH = mkDefault "${makeBinPath config.path}:${makeSearchPathOutput "bin" "sbin" config.path}";

with some added fiddlyness to handle *

In reply to @elvishjerricco:matrix.org
Yea the fiddlyness for * is the tricky part. I don't know if there's a correct way to do that

I've seen this before:

# foo.nix
{
  options.foo = mkOption { type = attrsOf (submodule <module>); };
}

#bar.nix
{
  options.foo = mkOption { type attrsOf (submodule <more module>); };
}

But I'm pretty sure this wasn't intended to work, and doesn't work anymore (last I checked, like a year ago)

I've seen this before:

# foo.nix
{
  options.foo = mkOption { type = attrsOf (submodule <module>); };
}

#bar.nix
{
  options.foo = mkOption { type = attrsOf (submodule <more module>); };
}

But I'm pretty sure this wasn't intended to work, and doesn't work anymore (last I checked, like a year ago)

We have this:

options.systemd.services = lib.mkOption {
    type = with lib.types; attrsOf (submodule ({ config, ... }: {
      options.reloadTriggers = lib.mkOption {
        default = [];
        type = listOf unitOption;
        description = ''
          An arbitrary list of items such as derivations.  If any item
          in the list changes between reconfigurations, the service will
          be reloaded.  If anything but a reload trigger changes in the
          unit file, the unit will be restarted instead.
        '';
      };

      config = lib.mkIf (config.reloadTriggers != []) {
        unitConfig.X-Reload-Triggers = toString config.reloadTriggers;
      };
    }));
  };

In reply to @elvishjerricco:matrix.org
I... might just use that