test

common.nix

@@ -8,6 +8,7 @@
   ...
 }: {
   # Shared Nix configuration
+  # Note: On Darwin with Determinate Nix, set nix.enable = false in darwin/configuration.nix
   nix = let
     flakeInputs = lib.filterAttrs (_: lib.isType "flake") inputs;
   in {
@@ -25,18 +26,17 @@
       nix-path = config.nix.nixPath;
     };
 
-    # Deduplicate and optimize nix store
-    optimise.automatic = true;
-
-    # Garbage collection
-    gc = {
-      automatic = true;
-      options = "--delete-older-than 7d";
-    };
-
     # Opinionated: make flake registry and nix path match flake inputs
     registry = lib.mapAttrs (_: flake: {inherit flake;}) flakeInputs;
     nixPath = lib.mapAttrsToList (n: _: "${n}=flake:${n}") flakeInputs;
+    
+    # Platform-specific: These require nix.enable = true (conflicts with Determinate Nix on Darwin)
+    # Only enable on Linux where we manage Nix ourselves
+    optimise.automatic = lib.mkIf pkgs.stdenv.isLinux true;
+    gc = lib.mkIf pkgs.stdenv.isLinux {
+      automatic = true;
+      options = "--delete-older-than 7d";
+    };
   };
 
   # Shared nixpkgs configuration
@@ -60,7 +60,7 @@
   # Shared environment packages
   environment.systemPackages = with pkgs; [
     vim
-    git
+    # git is managed by home-manager (programs.git)
     curl
     wget
   ];