treewide: migrate config/system/core to modules

Moved everything from core into modules. I want to get all the NixOS
stuff moved first, and do home-manager after. I used the different
profiles to disable configuration that might break my server, as it has
its own configuration already. This will need to be refactored later, as
I want to ultimately only use the local module system.

config/nixos/core/home-manager.nix

@@ -1,31 +0,0 @@
-{
-  config,
-  inputs,
-  ...
-}: let
-  inherit (config.local.systemVars) username;
-in {
-  imports = [
-    inputs.home-manager.nixosModules.default
-  ];
-
-  home-manager = {
-    backupFileExtension = "backup";
-    useGlobalPkgs = true;
-    useUserPackages = true;
-  };
-
-  home-manager.users.${username} = {
-    home = {
-      homeDirectory = "/home/${username}";
-      stateVersion = "24.05";
-    };
-
-    programs.home-manager.enable = true;
-  };
-
-  programs = {
-    # make HM-managed GTK stuff work
-    dconf.enable = true;
-  };
-}

config/nixos/core/lanzaboote.nix

@@ -1,26 +0,0 @@
-{
-  pkgs,
-  lib,
-  inputs,
-  ...
-}: {
-  imports = [
-    inputs.lanzaboote.nixosModules.lanzaboote
-  ];
-
-  environment.systemPackages = [
-    # For debugging and troubleshooting Secure Boot.
-    pkgs.sbctl
-  ];
-
-  # Lanzaboote currently replaces the systemd-boot module.
-  # This setting is usually set to true in configuration.nix
-  # generated at installation time. So we force it to false
-  # for now.
-  boot.loader.systemd-boot.enable = lib.mkForce false;
-
-  boot.lanzaboote = {
-    enable = true;
-    pkiBundle = "/etc/secureboot";
-  };
-}

config/nixos/core/networking.nix

@@ -1,3 +0,0 @@
-{
-  networking.nameservers = ["1.1.1.1" "1.0.0.1"];
-}

config/nixos/core/users.nix

@@ -1,13 +0,0 @@
-{config, ...}: {
-  users.users.${config.local.systemVars.username} = {
-    isNormalUser = true;
-    description = config.local.homeVars.fullName or "User";
-    extraGroups = [
-      "networkmanager"
-      "audio"
-      "video"
-      "wheel"
-      "plugdev"
-    ];
-  };
-}

config/nixos/default.nix

@@ -1,6 +1,5 @@
 {
   imports = [
-    ./core
     ./nix
 
     ./hardware/printing.nix

hosts/default.nix

@@ -13,7 +13,6 @@
   base = [
     ../modules
     "${self}/config/nixos"
-    "${self}/config/nixos/core/home-manager.nix"
 
     "${self}/config/nixos/services/documentation.nix"
 

modules/nix/core/default.nix

@@ -0,0 +1,12 @@
+{lib, ...}: {
+  imports = [
+    ./boot.nix
+    ./home-manager.nix
+    ./locales.nix
+    ./networking.nix
+    ./users.nix
+    ./security.nix
+  ];
+  system.stateVersion = lib.mkDefault "24.05";
+  zramSwap.enable = true;
+}

modules/nix/core/home-manager.nix

@@ -0,0 +1,34 @@
+{
+  inputs,
+  lib,
+  config,
+  ...
+}: let
+  inherit (config.local.systemVars) username;
+in {
+  imports = [
+    inputs.home-manager.nixosModules.default
+  ];
+
+  config = lib.mkIf (!config.local.profiles.server.enable) {
+    home-manager = {
+      backupFileExtension = "backup";
+      useGlobalPkgs = true;
+      useUserPackages = true;
+    };
+
+    home-manager.users.${username} = {
+      home = {
+        homeDirectory = "/home/${username}";
+        stateVersion = "24.05";
+      };
+
+      programs.home-manager.enable = true;
+    };
+
+    programs = {
+      # make HM-managed GTK stuff work
+      dconf.enable = true;
+    };
+  };
+}

modules/nix/core/locales.nix

@@ -1,10 +1,4 @@
 {lib, ...}: {
-  imports = [
-    ./boot.nix
-    ./users.nix
-    ./security.nix
-    ./networking.nix
-  ];
   i18n = {
     defaultLocale = "en_US.UTF-8";
     extraLocaleSettings = {
@@ -20,7 +14,5 @@
     };
   };
 
-  system.stateVersion = lib.mkDefault "24.05";
   time.timeZone = lib.mkDefault "Europe/Paris";
-  zramSwap.enable = true;
 }

modules/nix/core/networking.nix

@@ -0,0 +1,9 @@
+{
+  lib,
+  config,
+  ...
+}: {
+  config = lib.mkIf (!config.local.profiles.server.enable) {
+    networking.nameservers = ["1.1.1.1" "1.0.0.1"];
+  };
+}

modules/nix/core/users.nix

@@ -0,0 +1,19 @@
+{
+  lib,
+  config,
+  ...
+}: {
+  config = lib.mkIf (!config.local.profiles.server.enable) {
+    users.users.${config.local.systemVars.username} = {
+      isNormalUser = true;
+      description = config.local.homeVars.fullName or "User";
+      extraGroups = [
+        "networkmanager"
+        "audio"
+        "video"
+        "wheel"
+        "plugdev"
+      ];
+    };
+  };
+}

modules/nix/default.nix

@@ -1,3 +1,6 @@
 {
-  imports = [./style];
+  imports = [
+    ./core
+    ./style
+  ];
 }