Merge pull request #13 from hercules-ci/issue-12-mergeable-nixosConfigurations

Add nixosConfigurations

all-modules.nix

@@ -7,6 +7,7 @@
     ./modules/devShells.nix
     ./modules/flake.nix
     ./modules/legacyPackages.nix
+    ./modules/nixosConfigurations.nix
     ./modules/nixosModules.nix
     ./modules/overlay.nix
     ./modules/packages.nix

modules/nixosConfigurations.nix

@@ -0,0 +1,34 @@
+{ config, lib, flake-modules-core-lib, ... }:
+let
+  inherit (lib)
+    mkOption
+    types
+    literalExpression
+    ;
+  inherit (flake-modules-core-lib)
+    mkSubmoduleOptions
+    ;
+in
+{
+  options = {
+    flake = mkSubmoduleOptions {
+      nixosConfigurations = mkOption {
+        type = types.lazyAttrsOf types.raw;
+        default = { };
+        description = ''
+          Instantiated NixOS configurations.
+        '';
+        example = literalExpression ''
+          {
+            my-machine = inputs.nixpkgs.lib.nixosSystem {
+              system = "x86_64-linux";
+              modules = [
+                ./my-machine/nixos-configuration.nix
+              ];
+            };
+          }
+        '';
+      };
+    };
+  };
+}