reworked nixpath/registry

modules/nix.nix

@@ -4,34 +4,39 @@ inputs: {
   self,
   settings,
   ...
-}: {
+}: let
+  combined_flakes =
+    (
+      #filter non-flakes from inputs
+      lib.attrsets.filterAttrs (
+        _: value: (
+          !(lib.attrsets.hasAttrByPath ["flake"] value) || value.flake == false
+        )
+      )
+      inputs
+    )
+    // {
+      #alias unstable
+      nixpkgs = inputs.unstable;
+      #add system flake
+      system = self;
+    };
+in {
+  #create registry from input flakes
+  nix.registry = lib.attrsets.mapAttrs (_: value: {flake = value;}) combined_flakes;
+  #add all inputs to etc
+  environment.etc = lib.mapAttrs' (name: value: lib.attrsets.nameValuePair "/nixpath/${name}" {source = value;}) combined_flakes;
+  #source the etc paths to nixPath
+  nix.nixPath = lib.mapAttrsToList (name: _: name + "=" + "/etc/nixpath/${name}") combined_flakes;
+
+  #other nix settings
   nix = {
     package = pkgs.nixVersions.unstable;
-    #automatically get registry from input flakes
-    registry = (
-      lib.attrsets.mapAttrs (
-        _: value: {
-          flake = value;
-        }
-      ) (
-        lib.attrsets.filterAttrs (
-          _: value: (
-            !(lib.attrsets.hasAttrByPath ["flake"] value) || value.flake == false
-          )
-        )
-        inputs
-      )
-      // {
-        nixpkgs.flake = inputs.unstable;
-        system.flake = self;
-      }
-    );
-    #automatically add registry entries to nixPath
-    nixPath = (lib.mapAttrsToList (name: value: name + "=" + value) inputs) ++ ["system=${self}" "nixpkgs=${inputs.unstable}"];
     settings = {
       experimental-features = ["nix-command" "flakes" "repl-flake"];
       auto-optimise-store = true;
       warn-dirty = false;
+      #ignore global registry
       flake-registry = builtins.toFile "empty-flake-registry.json" ''{"flakes":[],"version":2}'';
       keep-outputs = true;
       keep-derivations = true;
@@ -43,6 +48,4 @@ inputs: {
       ];
     };
   };
-  #make gcroots for each flake input
-  systemd.tmpfiles.rules = lib.attrsets.mapAttrsToList (name: value: "L+ /nix/var/nix/gcroots/${name} - - - - ${value}") inputs;
 }