Pass used nixpkgs and home-manager to nix configs

flake.nix

@@ -129,7 +129,7 @@
           useUserPackages = true;
           inherit users;
           extraSpecialArgs = {
-            inherit inputs outputs vars nixpkgs;
+            inherit inputs outputs vars nixpkgs home-manager;
             extraPkgs = mkExtraPkgs system;
           };
         };
@@ -173,7 +173,7 @@
           })
         ] ++ extraModules;
         specialArgs = {
-          inherit inputs outputs vars nixpkgs;
+          inherit inputs outputs vars nixpkgs home-manager;
           extraPkgs = mkExtraPkgs system;
         };
       };

home/default.nix

@@ -1,7 +1,8 @@
-{ pkgs, config, lib, options, osConfig ? { }, ... }@args:
+{ pkgs, config, lib, options, osConfig ? { }, nixpkgs, home-manager, ... }@args:
 let
   isStandalone = with builtins; !( (typeOf osConfig == "set") && hasAttr "home-manager" osConfig );
   cfg = config.nixfiles;
+  flakeType = cfg.lib.types.flake;
 in
 {
   imports = [
@@ -18,6 +19,27 @@ in
       default = options;
       readOnly = true;
     };
+
+    lib = lib.mkOption {
+      description = "nixfiles library";
+      default = (import ../lib/nixfiles) pkgs;
+      readOnly = true;
+    };
+
+    nixpkgs = lib.mkOption {
+      description = "nixpkgs flake";
+      type = flakeType;
+      default = nixpkgs;
+      example = "inputs.nixpkgs";
+    };
+
+    home-manager = lib.mkOption {
+      description = "home-manager flake";
+      type = flakeType;
+      default = home-manager;
+      example = "inputs.home-manager";
+    };
+
     meta.standalone = lib.mkOption {
       default = isStandalone;
       description = "Whether or not the home-manager installation is standalone (standalone installations don't have access to osConfig).";

lib/nixfiles/default.nix

@@ -0,0 +1,7 @@
+pkgs:
+let
+  inherit (pkgs) lib;
+in
+{
+  types = (import ./types.nix) pkgs;
+}

lib/nixfiles/types.nix

@@ -0,0 +1,13 @@
+pkgs:
+let
+  inherit (pkgs) lib;
+  inherit (lib.types) mkOptionType;
+  inherit (lib.options) mergeEqualOption;
+in
+{
+  flake = mkOptionType {
+    name="flake";
+    description="Nix flake";
+    descriptionClass = "noun";
+    merge = mergeEqualOption; check = (value: value._type or "" == "flake"); };
+}

system/default.nix

@@ -1,6 +1,7 @@
-{ pkgs, config, lib, options, ... }@args:
+{ pkgs, config, lib, options, nixpkgs, home-manager, ... }@args:
 let
   cfg = config.nixfiles;
+  flakeType = cfg.lib.types.flake;
 in
 {
   imports = [
@@ -21,5 +22,26 @@ in
       example = true;
       type = lib.types.bool;
     };
+
+    lib = lib.mkOption {
+      description = "nixfiles library";
+      default = (import ../lib/nixfiles) pkgs;
+      readOnly = true;
+      type = lib.types.attrs;
+    };
+
+    nixpkgs = lib.mkOption {
+      description = "nixpkgs flake";
+      default = nixpkgs;
+      type = flakeType;
+      example = "nixpkgs";
+    };
+
+    home-manager = lib.mkOption {
+      description = "home-manager flake";
+      default = home-manager;
+      type = flakeType;
+      example = "home-manager";
+    };
   };
 }