Modularize nixos user

This is to make creating installers easier.

hosts/bootstrap/default.nix

@@ -3,6 +3,7 @@
 {
   imports = [
     "${modulesPath}/installer/cd-dvd/installation-cd-minimal.nix"
+    (lib.getUser "nixos" "nixos")
   ];
 
   isoImage = {
@@ -19,57 +20,7 @@
   networking.hostName = "bootstrap";
   boot.supportedFilesystems = lib.mkForce [ "btrfs" "reiserfs" "vfat" "f2fs" "xfs" "ntfs" "cifs" ];
 
-  nix = {
+  users.users.root.password = "";
-    gc.automatic = true;
-    optimise.automatic = true;
-
-    # Please see `nix-conf.5` manual for more details.
-    settings = {
-      # All to make improvement for using Nix.
-      trusted-users = [ "root" "@wheel" ];
-      allow-import-from-derivation = true;
-      allow-dirty = true;
-      auto-optimise-store = true;
-      sandbox = true;
-
-      # Set several binary caches.
-      substituters = [
-        "https://cache.nixos.org/"
-        "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="
-      ];
-    };
-  };
-
-  users.users = {
-    root.password = "";
-
-    nixos = {
-      password = "nixos";
-      description = "default";
-      isNormalUser = true;
-      extraGroups = [ "wheel" ];
-    };
-  };
-
-  environment.systemPackages = with pkgs; [
-    binutils
-    coreutils
-    moreutils
-    whois
-    jq
-    git
-    manix
-
-    # The coreutils replacement.
-    ripgrep
-    fd
-    bat
-  ];
 
   boot.loader.systemd-boot.enable = true;
 }

users/nixos/nixos/default.nix

@@ -0,0 +1,54 @@
+# This is the user usually used for installers. Don't treat it like a normal
+# user, pls. It will override several things just to teach you a lesson. :)
+{ lib, pkgs, ... }:
+
+{
+  users.users.nixos = {
+    password = "nixos";
+    description = "default";
+    isNormalUser = true;
+    extraGroups = [ "wheel" ];
+  };
+
+  nix = {
+    gc.automatic = true;
+    optimise.automatic = true;
+
+    # Please see `nix-conf.5` manual for more details.
+    settings = {
+      # All to make improvement for using Nix.
+      trusted-users = [ "root" "@wheel" ];
+      allow-import-from-derivation = true;
+      allow-dirty = true;
+      auto-optimise-store = true;
+      sandbox = true;
+
+      # Set several binary caches.
+      substituters = [
+        "https://cache.nixos.org/"
+        "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="
+      ];
+    };
+  };
+
+  environment.systemPackages = with pkgs; [
+    binutils
+    coreutils
+    moreutils
+    neovim
+    whois
+    jq
+    git
+    manix
+
+    # The coreutils replacement.
+    ripgrep
+    fd
+    bat
+  ];
+}