Make local cache configurable

modules/baseline.nix

@@ -14,9 +14,6 @@ let
       [ ];
 in
 {
-  # This is a dumb hack to pass the value into the import below, but it's how we have to do it,
-  # since that's how the module system works
-  _module.args.cache = true;
   imports = [
     ./nix-conf.nix
   ];

modules/nix-conf.nix

@@ -1,60 +1,72 @@
 {
   pkgs,
   lib,
-  cache,
+  config,
   ...
 }:
 
+let
+  cfg = config.greg.nix;
+in
 {
-  nix = {
-    gc = {
-      automatic = true;
-      # Scheduling of them is different in nixos vs nix-darwin, so check for
-      # the extra details there
-      options = "--delete-older-than 30d";
-    };
-
-    package = pkgs.nixStable;
-
-    settings = {
-      cores = 0; # Use all cores for builds
-      download-buffer-size = 500 * 1024 * 1024;
-      experimental-features = "nix-command flakes";
-      keep-outputs = true;
-      keep-derivations = true;
-      min-free = (toString (1024 * 1024 * 1024));
-      max-free = (toString (5 * 1024 * 1024 * 1024));
-      trusted-users = [
-        "greg"
-        "gregory.hellings"
-      ]; # For home and for work machines
-      substituters =
-        (lib.optionals cache [
-          "http://nas.thehellings.lan:9000/binary-cache/"
-          "http://nas.home:9000/binary-cache/"
-        ])
-        ++ [
-          "https://ai.cachix.org"
-          "https://nixpkgs-python.cachix.org"
-          "https://greg-hellings.cachix.org"
-          "https://nix-community.cachix.org"
-          "https://cache.nixos.org"
-        ];
-      trusted-public-keys = [
-        "nix.thehellings.lan:0qWYHn3gGllXChhAaaxKlNZtRy6yG/XJs1RFSqV3nW8="
-        "nix.home:0qWYHn3gGllXChhAaaxKlNZtRy6yG/XJs1RFSqV3nW8="
-        "ai.cachix.org-1:N9dzRK+alWwoKXQlnn0H6aUx0lU/mspIoz8hMvGvbbc="
-        "nixpkgs-python.cachix.org-1:hxjI7pFxTyuTHn2NkvWCrAUcNZLNS3ZAvfYNuYifcEU="
-        "greg-hellings.cachix.org-1:y01Jl/L5evlhxdnUW6n56AiI1k8g1wxWhTxJCe7XSco="
-        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
-        "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
-      ];
+  options.greg.nix = {
+    cache = lib.mkOption {
+      type = lib.types.bool;
+      default = true;
     };
   };
 
-  nixpkgs.config = {
-    allowUnfree = true;
-    allowUnfreePredicate = _: true;
-    permittedInsecurePackages = [ "ventoy-1.1.05" ];
+  config = {
+    nix = {
+      gc = {
+        automatic = true;
+        # Scheduling of them is different in nixos vs nix-darwin, so check for
+        # the extra details there
+        options = "--delete-older-than 30d";
+      };
+
+      package = pkgs.nixStable;
+
+      settings = {
+        cores = 0; # Use all cores for builds
+        download-buffer-size = 500 * 1024 * 1024;
+        experimental-features = "nix-command flakes";
+        keep-outputs = true;
+        keep-derivations = true;
+        min-free = (toString (1024 * 1024 * 1024));
+        max-free = (toString (5 * 1024 * 1024 * 1024));
+        trusted-users = [
+          "greg"
+          "gregory.hellings"
+        ]; # For home and for work machines
+        substituters =
+          (lib.optionals cfg.cache [
+            "http://nas.thehellings.lan:9000/binary-cache/"
+            "http://nas.home:9000/binary-cache/"
+          ])
+          ++ [
+            "https://ai.cachix.org"
+            "https://nixpkgs-python.cachix.org"
+            "https://greg-hellings.cachix.org"
+            "https://nix-community.cachix.org"
+            "https://cache.nixos.org"
+          ];
+        trusted-public-keys = [
+          "nix.thehellings.lan:0qWYHn3gGllXChhAaaxKlNZtRy6yG/XJs1RFSqV3nW8="
+          "nix.home:0qWYHn3gGllXChhAaaxKlNZtRy6yG/XJs1RFSqV3nW8="
+          "ai.cachix.org-1:N9dzRK+alWwoKXQlnn0H6aUx0lU/mspIoz8hMvGvbbc="
+          "nixpkgs-python.cachix.org-1:hxjI7pFxTyuTHn2NkvWCrAUcNZLNS3ZAvfYNuYifcEU="
+          "greg-hellings.cachix.org-1:y01Jl/L5evlhxdnUW6n56AiI1k8g1wxWhTxJCe7XSco="
+          "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+          "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
+        ];
+      };
+    };
+
+    nixpkgs.config = {
+      allowUnfree = true;
+      allowUnfreePredicate = _: true;
+      permittedInsecurePackages = [ "ventoy-1.1.05" ];
+    };
   };
 }