modules: create dedicated default Nix config profile

configs/flake-parts/default.nix

@@ -25,33 +25,17 @@
             lib.nameValuePair name' { inherit flake; })
           inputs;
 
-      # Set the package for generating the configuration.
-      nix.package = lib.mkDefault pkgs.nixStable;
-
-      # Set the configurations for the package manager.
-      nix.settings = {
-        # Set several binary caches.
-        substituters = [
-          "https://nix-community.cachix.org"
-          "https://foo-dogsquared.cachix.org"
-        ];
-        trusted-public-keys = [
-          "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
-          "foo-dogsquared.cachix.org-1:/2fmqn/gLGvCs5EDeQmqwtus02TUmGy0ZlAEXqRE70E="
-        ];
-
-        # Sane config for the package manager.
-        # TODO: Remove this after nix-command and flakes has been considered
-        # stable.
-        #
-        # Since we're using flakes to make this possible, we need it. Plus, the
-        # UX of Nix CLI is becoming closer to Guix's which is a nice bonus.
-        experimental-features = [ "nix-command" "flakes" "repl-flake" ];
-        auto-optimise-store = lib.mkDefault true;
-      };
-
-      # Stallman-senpai will be disappointed.
-      nixpkgs.config.allowUnfree = true;
+      nix.settings.nix-path =
+        (lib.mapAttrsToList
+          (name: source:
+            let
+              name' = if (name == "self") then "config" else name;
+            in
+            "${name'}=${source}")
+          inputs
+        ++ [
+          "/nix/var/nix/profiles/per-user/root/channels"
+        ]);
 
       # Extend nixpkgs with our overlays except for the NixOS-focused modules
       # here.

configs/flake-parts/home-manager.nix

@@ -69,6 +69,7 @@
 
     standaloneConfigModules = [
       defaultNixConf
+      ../../modules/home-manager/profiles/nix-conf.nix
 
       ({ config, lib, ... }: {
         # Don't create the user directories since they are assumed to

configs/flake-parts/nixos.nix

@@ -93,23 +93,11 @@
       # Bring our own teeny-tiny snippets of configurations.
       defaultNixConf
       ../../modules/nixos/profiles/generic.nix
+      ../../modules/nixos/profiles/nix-conf.nix
 
       # The NixOS module that came from flake-parts.
       ({ config, lib, ... }: {
         _module.args = defaultExtraArgs;
-
-        # Set several paths for the traditional channels.
-        nix.nixPath = lib.mkIf config.nix.channel.enable
-          (lib.mapAttrsToList
-            (name: source:
-              let
-                name' = if (name == "self") then "config" else name;
-              in
-              "${name'}=${source}")
-            inputs
-          ++ [
-            "/nix/var/nix/profiles/per-user/root/channels"
-          ]);
       })
     ];
   };

modules/home-manager/profiles/nix-conf.nix

@@ -0,0 +1,30 @@
+{ lib, pkgs, ... }: {
+
+  # Set the package for generating the configuration.
+  nix.package = lib.mkDefault pkgs.nixStable;
+
+  # Set the configurations for the package manager.
+  nix.settings = {
+    # Set several binary caches.
+    substituters = [
+      "https://nix-community.cachix.org"
+      "https://foo-dogsquared.cachix.org"
+    ];
+    trusted-public-keys = [
+      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+      "foo-dogsquared.cachix.org-1:/2fmqn/gLGvCs5EDeQmqwtus02TUmGy0ZlAEXqRE70E="
+    ];
+
+    # Sane config for the package manager.
+    # TODO: Remove this after nix-command and flakes has been considered
+    # stable.
+    #
+    # Since we're using flakes to make this possible, we need it. Plus, the
+    # UX of Nix CLI is becoming closer to Guix's which is a nice bonus.
+    experimental-features = [ "nix-command" "flakes" "repl-flake" ];
+    auto-optimise-store = lib.mkDefault true;
+  };
+
+  # Stallman-senpai will be disappointed.
+  nixpkgs.config.allowUnfree = true;
+}

modules/nixos/profiles/nix-conf.nix

@@ -0,0 +1,30 @@
+{ lib, pkgs, ... }: {
+
+  # Set the package for generating the configuration.
+  nix.package = lib.mkDefault pkgs.nixStable;
+
+  # Set the configurations for the package manager.
+  nix.settings = {
+    # Set several binary caches.
+    substituters = [
+      "https://nix-community.cachix.org"
+      "https://foo-dogsquared.cachix.org"
+    ];
+    trusted-public-keys = [
+      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+      "foo-dogsquared.cachix.org-1:/2fmqn/gLGvCs5EDeQmqwtus02TUmGy0ZlAEXqRE70E="
+    ];
+
+    # Sane config for the package manager.
+    # TODO: Remove this after nix-command and flakes has been considered
+    # stable.
+    #
+    # Since we're using flakes to make this possible, we need it. Plus, the
+    # UX of Nix CLI is becoming closer to Guix's which is a nice bonus.
+    experimental-features = [ "nix-command" "flakes" "repl-flake" ];
+    auto-optimise-store = lib.mkDefault true;
+  };
+
+  # Stallman-senpai will be disappointed.
+  nixpkgs.config.allowUnfree = true;
+}