feat: Make username customizable

Now it's possible to use whatever username you want for your system. The
default value of "user" is good if you're concerned about information
disclosure attacks through things like the username being visible in
logs or other output.

containers/shared.nix

@@ -1,5 +1,8 @@
-{ pkgs, ... }:
+{ pkgs, lib, config, ... }:
 
+let
+  inherit (config.modules.system) username;
+in
 {
   imports = [
     ../modules/fish.nix
@@ -52,13 +55,11 @@
   users = {
     allowNoPasswordLogin = true;
 
-    users = {
-      user = {
+    users.${username} = {
       password = lib.mkForce null;
       extraGroups = lib.mkForce [ ];
     };
   };
-  };
 
   services.xserver.enable = true;
   hardware.opengl.enable = true;

modules/desktop.nix

@@ -4,6 +4,7 @@ let
   inherit (lib) mkEnableOption mkIf;
   inherit (pkgs.xfce) thunar-volman exo;
   inherit (pkgs) glib;
+  inherit (config.modules.system) username;
 
   theme = "monokai";
   opacity = 0.95;
@@ -100,7 +101,7 @@ in
 
         initial_session = {
           command = "${pkgs.hyprland}/bin/Hyprland";
-          user = "user";
+          user = username;
         };
       };
     };

modules/system.nix

@@ -4,11 +4,17 @@ let
   inherit (lib) mkOption;
   inherit (lib.types) str listOf;
   inherit (pkgs.nixVersions) nix_2_19;
+  inherit (cfg) username;
 
   cfg = config.modules.system;
 in
 {
   options.modules.system = {
+    username = mkOption {
+      type = str;
+      default = "user";
+    };
+
     timeZone = mkOption {
       type = str;
       default = "America/New_York";
@@ -81,15 +87,13 @@ in
     users = {
       mutableUsers = false;
 
-      users = {
-        user = {
+      users.${username} = {
         isNormalUser = true;
         uid = 1000;
         password = "user";
         extraGroups = [ "wheel" "networkmanager" ];
       };
     };
-    };
 
     home-manager = {
       useGlobalPkgs = true;
@@ -100,11 +104,10 @@ in
         programs.man.generateCaches = true;
       }];
 
-      users = {
-        user = {
-          home.username = "user";
-          home.homeDirectory = "/home/user";
-        };
+      users.${username}.home = {
+        inherit username;
+
+        homeDirectory = "/home/${username}";
       };
     };
   };

specializations/gnome.nix

@@ -1,5 +1,8 @@
-{ pkgs, lib, ... }:
+{ pkgs, lib, config, ... }:
 
+let
+  inherit (config.modules.system) username;
+in
 {
   services.xserver = {
     enable = true;
@@ -13,7 +16,7 @@
 
       autoLogin = {
         enable = true;
-        user = "user";
+        user = username;
       };
     };
 

specializations/plasma.nix

@@ -1,5 +1,8 @@
-{ pkgs, lib, ... }:
+{ pkgs, lib, config, ... }:
 
+let
+  inherit (config.modules.system) username;
+in
 {
   services.xserver = {
     enable = true;
@@ -9,7 +12,7 @@
 
       autoLogin = {
         enable = true;
-        user = "user";
+        user = username;
       };
     };