profiles/users: move as a library function

flake.nix

@@ -107,6 +107,12 @@
 
       # The default configuration for our NixOS systems.
       hostDefaultConfig = { pkgs, system, ... }: {
+        # Only use imports as minimally as possible with the absolute
+        # requirements of a host.
+        imports = [
+          inputs.home-manager.nixosModules.home-manager
+        ];
+
         # Bleeding edge, baybee!
         nix.package = pkgs.nixUnstable;
 

hosts/ni/default.nix

@@ -1,4 +1,4 @@
-{ config, pkgs, inputs, ... }:
+{ config, pkgs, lib, inputs, ... }:
 
 {
   imports = [
@@ -6,6 +6,15 @@
     ./hardware-configuration.nix
 
     inputs.guix-overlay.nixosModules.guix-binary
+
+    (lib.mapHomeManagerUser "foo-dogsquared" {
+      extraGroups = [ "wheel" "audio" "docker" "podman" "networkmanager" ];
+      hashedPassword =
+        "$6$.cMYto0K0CHbpIMT$dRqyKs4q1ppzmTpdzy5FWP/V832a6X..FwM8CJ30ivK0nfLjQ7DubctxOZbeOtygfjcUd1PZ0nQoQpOg/WMvg.";
+      isNormalUser = true;
+      createHome = true;
+      home = "/home/foo-dogsquared";
+    })
   ];
 
   boot.binfmt.emulatedSystems = [
@@ -31,14 +40,6 @@
       virtualization.enable = true;
       neovim.enable = true;
     };
-    users.users.foo-dogsquared.settings = {
-      extraGroups = [ "wheel" "audio" "docker" "podman" "networkmanager" ];
-      hashedPassword =
-        "$6$.cMYto0K0CHbpIMT$dRqyKs4q1ppzmTpdzy5FWP/V832a6X..FwM8CJ30ivK0nfLjQ7DubctxOZbeOtygfjcUd1PZ0nQoQpOg/WMvg.";
-      isNormalUser = true;
-      createHome = true;
-      home = "/home/foo-dogsquared";
-    };
   };
 
   tasks = {

lib/private.nix

@@ -3,6 +3,21 @@
 { lib }:
 
 rec {
+  mapHomeManagerUser = user: settings:
+    let
+      defaultUserConfig = {
+        extraGroups = [ "wheel" ];
+        createHome = true;
+        home = "/home/${user}";
+      };
+      # TODO: Effectively override the option.
+      # We assume all users set with this module are normal users.
+      absoluteOverrides = { isNormalUser = true; };
+    in {
+    home-manager.users."${user}" = import (lib.getUser "home-manager" user);
+    users.users."${user}" = defaultUserConfig // settings // absoluteOverrides;
+  };
+
   getSecret = path: ../secrets/${path};
 
   getUsers = type: users:

modules/nixos/profiles/users.nix

@@ -1,87 +0,0 @@
-# This enables home-manager specific configs and an easier modularization for
-# user-specific configurations. This is specifically for creating a convenient
-# way to create users from `users/home-manager`.
-#
-# If you're looking to create users from `users/nixos`, you can just import
-# them directly.
-{ inputs, config, options, lib, ... }:
-
-let
-  cfg = config.profiles.users;
-  users = lib.attrNames cfg.users;
-  homeManagerUserModules = lib.getUsers "home-manager" users;
-  homeManagerModules = lib.filesToAttr ../../home-manager;
-
-  homeManagerUsers = lib.attrNames homeManagerUserModules;
-  nonexistentUsers = lib.filter (name: !lib.elem name homeManagerUsers) users;
-
-  userOption = { name, config, ... }: {
-    options = {
-      settings = lib.mkOption {
-        type = lib.types.attrs;
-        description = ''
-          Configuration to be merged in <literal>users.users.<name></literal>
-          from NixOS configuration.
-        '';
-        default = { };
-        example = {
-          uid = 1234;
-          description = "John Doe";
-          extraGroups = [ "wheel" "adbusers" "audio" ];
-        };
-      };
-    };
-  };
-
-  mapUsers = f: lib.mapAttrs f cfg.users;
-in {
-  options.profiles.users = {
-    users = lib.mkOption {
-      default = { };
-      description = ''
-        A set of users from the <filename>./users/home-manager</filename>
-        directory to be included in the NixOS config. This will also create the
-        appropriate user settings in <literal>users.users</literal> in the
-        NixOS configuration.
-      '';
-      example = {
-        foo-dogsquared.settings = {
-          extraGroups = [ "wheel" "audio" "libvirtd" ];
-        };
-        alice = { };
-        bob = { };
-      };
-      type = with lib.types; attrsOf (submodule userOption);
-    };
-  };
-
-  imports = [ inputs.home-manager.nixosModules.home-manager ];
-
-  config = {
-    assertions = [{
-      assertion = (builtins.length nonexistentUsers) < 1;
-      message = "${
-          lib.concatMapStringsSep ", " (u: "'${u}'") nonexistentUsers
-        } is not found in the `./users/home-manager` directory.";
-    }];
-
-    # Mapping each users to the respective user configuration.
-    # Setting users for home-manager.
-    home-manager.users = mapUsers (user: _:
-      let homeManagerUserModulePath = lib.getAttr user homeManagerUserModules;
-      in import homeManagerUserModulePath);
-
-    # NixOS users.
-    users.users = mapUsers (user: opts:
-      let
-        defaultUserConfig = {
-          extraGroups = [ "wheel" ];
-          createHome = true;
-          home = "/home/${user}";
-        };
-        # TODO: Effectively override the option.
-        # We assume all users set with this module are normal users.
-        absoluteOverrides = { isNormalUser = true; };
-      in defaultUserConfig // opts.settings // absoluteOverrides);
-  };
-}