fix(noflake): Avoid user need to know of flake top-level attr.

.github/workflows/test.yml

@@ -28,7 +28,7 @@ jobs:
       - uses: DeterminateSystems/magic-nix-cache-action@v13
       - uses: actions/checkout@v4
       - run: sed -i 's@# den.outPath@den.outPath@' templates/noflake/with-inputs.nix
-      - run: cd templates/noflake && nix-build -A flake.nixosConfigurations.igloo.config.system.build.toplevel
+      - run: cd templates/noflake && nix-build -A nixosConfigurations.igloo.config.system.build.toplevel
   template:
     needs: [non-draft]
     strategy:

templates/noflake/README.md

@@ -6,9 +6,12 @@ It configures a NixOS host with one user.
 
 Try it with:
 
+```shell
+nixos-rebuild build --file . -A nixosConfigurations.igloo
 ```
-nix-build -A flake.nixosConfigurations.igloo.config.system.build.toplevel
-```
 
-NOTE: Currently Den needs a top-level attribute where to place configurations,
-by default it is the `flake` attribute, even if Den uses no flake-parts at all.
+or
+
+```shell
+nix-build -A nixosConfigurations.igloo.config.system.build.toplevel
+```

templates/noflake/default.nix

@@ -1,20 +1,16 @@
 let
 
-  modules =
-    { inputs, ... }:
-    {
-      imports = [ (inputs.import-tree ./modules) ];
-    };
-
   outputs =
     inputs:
     (inputs.nixpkgs.lib.evalModules {
-      modules = [ modules ];
+      modules = [ (inputs.import-tree ./modules) ];
       specialArgs = {
         inherit inputs;
         inherit (inputs) self;
       };
     }).config;
 
 in
-import ./with-inputs.nix outputs
+# Den outputs configurations at flake top-level attr
+# even when it does not depend on flakes or flake-parts.
+(import ./with-inputs.nix outputs).flake

templates/noflake/modules/compat.nix

@@ -0,0 +1,11 @@
+{ inputs, lib, ... }:
+{
+  # we can import this flakeModule even if we dont have flake-parts as input!
+  imports = [ inputs.den.flakeModule ];
+
+  # NOTE: Currently Den needs a top-level attribute where to place configurations,
+  # by default it is the `flake` attribute, even if Den uses no flake-parts at all.
+  options.flake = lib.mkOption {
+    type = lib.types.submodule { freeformType = lib.types.anything; };
+  };
+}

templates/noflake/modules/den.nix

@@ -1,12 +1,38 @@
-{ inputs, lib, ... }:
+{ inputs, ... }:
 {
-  # we can import this flakeModule even if we dont
-  # have flake-parts as input!
-  imports = [ inputs.den.flakeModule ];
-
-  # for flake.nixosConfigurations output.
-  # create a freeform option for it
-  options.flake = lib.mkOption {
-    type = lib.types.submodule { freeformType = lib.types.anything; };
+  # tux user on igloo host.
+  den.hosts.x86_64-linux.igloo.users.tux = { };
+
+  # host aspect
+  den.aspects.igloo = {
+    nixos =
+      { pkgs, ... }:
+      {
+        # remove these for a real bootable host
+        boot.loader.grub.enable = false;
+        fileSystems."/".device = "/dev/fake";
+        passthru = { };
+
+        environment.systemPackages = [
+          pkgs.vim
+        ];
+      };
+  };
+
+  # user aspect
+  den.aspects.tux = {
+    # user configures the host it lives in
+    nixos = {
+      # hipster-tux uses nix-maid instead of home-manager.
+      imports = [ inputs.nix-maid.nixosModules.default ];
+
+      users.users.tux = {
+        isNormalUser = true;
+        maid.file.home.".gitconfig".text = ''
+          [user]
+            name=Tux
+        '';
+      };
+    };
   };
 }