Fix: forward meta attributes in flake-parts module

This fixes building machines with the flake-parts module.

Since the inventory merges the machines, the `clan.core.meta` attribute
is now a submodule and conditionally imported.

Also drops the following attributes:
- clan.core.meta.icon
- clan.core.meta.description

In favor of specifying them inside the inventory.

This doesn't use `mkRemovedOptionsModule`, because in our case it would
cause infinite recursion.

flakeModules/clan.nix

@@ -3,20 +3,19 @@ clan-core:
   config,
   lib,
   flake-parts-lib,
+  self,
   inputs,
   ...
 }:
 let
-  inherit (lib) mkOption types;
+  inherit (lib) types;
 in
 {
 
   options.clan = lib.mkOption {
     type = types.submoduleWith {
-      # _module.args = {
-      # };
       specialArgs = {
-        inherit clan-core;
+        inherit clan-core self;
         inherit (inputs) nixpkgs;
       };
       modules = [

lib/build-clan/default.nix

@@ -11,6 +11,7 @@
   directory, # The directory containing the machines subdirectory # allows to include machine-specific modules i.e. machines.${name} = { ... }
   # A map from arch to pkgs, if specified this nixpkgs will be only imported once for each system.
   # This improves performance, but all nipxkgs.* options will be ignored.
+  # deadnix: skip
   inventory ? { },
   ## Sepcial inputs (not passed to the module system as config)
   specialArgs ? { }, # Extra arguments to pass to nixosSystem i.e. useful to make self available # A set containing clan meta: name :: string, icon :: string, description :: string
@@ -27,14 +28,9 @@ let
       ;
     self = directory;
   };
-  meta = attrs.meta or { };
-  rest = builtins.removeAttrs attrs [
-    "meta"
-    "specialArgs"
-  ];
+  rest = builtins.removeAttrs attrs [ "specialArgs" ];
 in
 eval {
-  inventory.meta = lib.mapAttrs (_: lib.mkDefault) meta;
   imports = [
     rest
     # implementation

lib/build-clan/interface.nix

@@ -1,4 +1,4 @@
-{ lib, ... }:
+{ lib, self, ... }:
 let
   types = lib.types;
 in
@@ -7,6 +7,7 @@ in
     # Required options
     directory = lib.mkOption {
       type = types.path;
+      default = self;
       description = "The directory containing the clan subdirectory";
     };
 
@@ -26,22 +27,18 @@ in
     };
 
     # Meta
-    meta = {
-      name = lib.mkOption {
-        type = types.nullOr types.str;
-        default = null;
-        description = "Needs to be (globally) unique, as this determines the folder name where the flake gets downloaded to.";
-      };
-      icon = lib.mkOption {
-        type = types.nullOr types.path;
-        default = null;
-        description = "A path to an icon to be used for the clan in the GUI";
-      };
-      description = lib.mkOption {
-        type = types.nullOr types.str;
-        default = null;
-        description = "A short description of the clan";
-      };
+    meta = lib.mkOption {
+      type = types.nullOr (
+        types.submodule {
+          options = {
+            name = lib.mkOption {
+              type = types.nullOr types.str;
+              description = "Needs to be (globally) unique, as this determines the folder name where the flake gets downloaded to.";
+            };
+          };
+        }
+      );
+      default = null;
     };
 
     pkgsForSystem = lib.mkOption {

lib/build-clan/module.nix

@@ -201,6 +201,8 @@ in
   imports = [
     # Merge the inventory file
     { inventory = inventoryLoaded; }
+    # Merge the meta attributes from the buildClan function
+    { inventory.meta = if config.meta != null then config.meta else { }; }
   ];
 
   inherit nixosConfigurations;

lib/build-clan/tests.nix

@@ -15,10 +15,13 @@ in
 {
   test_only_required =
     let
-      config = evalClan { directory = ./.; };
+      config = evalClan {
+        meta.name = "test";
+        imports = [ ./module.nix ];
+      };
     in
     {
-      expr = config.pkgsForSystem null == null;
+      expr = config.inventory ? meta;
       expected = true;
     };
 
@@ -93,10 +96,9 @@ in
     in
     {
       expr = result.clanInternals.meta;
-      expected = {
-        description = "description";
-        icon = "icon";
-        name = "superclan";
+      expectedError = {
+        type = "ThrownError";
+        msg = "";
       };
     };