test template/minimal

.github/workflows/test.yml

@@ -28,7 +28,31 @@ 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: |
+          cat <<-EOF > templates/noflake/modules/ci-runtime.nix
+          {
+            _module.args.CI = true;
+          }
+          EOF
+          git add templates/noflake/modules/ci-runtime.nix
       - run: cd templates/noflake && nix-build -A nixosConfigurations.igloo.config.system.build.toplevel
+  minimal:
+    needs: [non-draft]
+    name: minimal
+    runs-on: ubuntu-latest
+    steps:
+      - uses: wimpysworld/nothing-but-nix@main
+      - uses: cachix/install-nix-action@v31
+      - uses: DeterminateSystems/magic-nix-cache-action@v13
+      - uses: actions/checkout@v4
+      - run: |
+          cat <<-EOF > templates/minimal/modules/ci-runtime.nix
+          {
+            _module.args.CI = true;
+          }
+          EOF
+          git add templates/minimal/modules/ci-runtime.nix
+      - run: nix flake check ./templates/minimal --override-input den github:$GITHUB_REPOSITORY/$GITHUB_SHA
   template:
     needs: [non-draft]
     strategy:

modules/aspects/provides/ci-noboot.nix

@@ -0,0 +1,9 @@
+{ config, lib, ... }:
+{
+  den.default.includes = lib.optionals (config ? _module.args.CI) [
+    {
+      nixos.fileSystems."/".device = lib.mkDefault "/dev/noroot";
+      nixos.boot.loader.grub.enable = lib.mkDefault false;
+    }
+  ];
+}

modules/output.nix

@@ -0,0 +1,11 @@
+{ inputs, lib, ... }:
+if inputs ? flake-parts then
+  { }
+else
+  {
+    # 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/bogus/.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: wimpysworld/nothing-but-nix@main
         if: matrix.os == 'ubuntu-latest'
       - uses: cachix/install-nix-action@v31
-      - uses: DeterminateSystems/magic-nix-cache-action@13
+      - uses: DeterminateSystems/magic-nix-cache-action@v13
       - uses: actions/checkout@v5
       - run: nix flake metadata
       - run: nix flake check

templates/bogus/modules/test-base.nix

@@ -1,4 +1,4 @@
-{ den, ... }:
+{ den, lib, ... }:
 {
   den.default.nixos.system.stateVersion = "25.11";
   den.default.homeManager.home.stateVersion = "25.11";
@@ -11,7 +11,7 @@
   ];
 
   den.aspects.no-boot.nixos = {
-    boot.loader.grub.enable = false;
-    fileSystems."/".device = "/dev/fake";
+    boot.loader.grub.enable = lib.mkForce false;
+    fileSystems."/".device = lib.mkForce "/dev/fake";
   };
 }

templates/minimal/flake.nix

@@ -1,11 +1,13 @@
 {
-  outputs = inputs: inputs.flake-parts.lib.mkFlake { inherit inputs; } (inputs.import-tree ./modules);
+  outputs =
+    inputs:
+    (inputs.nixpkgs.lib.evalModules {
+      modules = [ (inputs.import-tree ./modules) ];
+      specialArgs = { inherit inputs; };
+    }).config.flake;
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
-    flake-parts.url = "github:hercules-ci/flake-parts";
-    flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";
-
     import-tree.url = "github:vic/import-tree";
     flake-aspects.url = "github:vic/flake-aspects";
     den.url = "github:vic/den";

templates/minimal/modules/den.nix

@@ -1,8 +1,20 @@
 { inputs, den, ... }:
 {
-  systems = builtins.attrNames den.hosts;
+  # we can import this flakeModule even if we dont have flake-parts as input!
   imports = [ inputs.den.flakeModule ];
 
   den.hosts.x86_64-linux.igloo.users.tux = { };
-  den.aspects.igloo = { };
+
+  den.aspects.igloo = {
+    nixos =
+      { pkgs, ... }:
+      {
+        environment.systemPackages = [ pkgs.hello ];
+        passthru = { };
+      };
+  };
+
+  den.aspects.tux = {
+    includes = [ den.provides.primary-user ];
+  };
 }

templates/noflake/modules/den.nix

@@ -1,5 +1,8 @@
 { inputs, ... }:
 {
+  # we can import this flakeModule even if we dont have flake-parts as input!
+  imports = [ inputs.den.flakeModule ];
+
   # tux user on igloo host.
   den.hosts.x86_64-linux.igloo.users.tux = { };
 
@@ -8,11 +11,7 @@
     nixos =
       { pkgs, ... }:
       {
-        # remove these for a real bootable host
-        boot.loader.grub.enable = false;
-        fileSystems."/".device = "/dev/fake";
         passthru = { };
-
         environment.systemPackages = [
           pkgs.vim
         ];