nixos: define user limits

nixos/users.nix

@@ -1,7 +1,7 @@
-{ pkgs, ... }:
-{
-  users.users =
+{ lib, ... }:
 let
+  inherit (lib) optionals;
+
   adminGroups = [
     "adm"
     "named"
@@ -10,18 +10,43 @@
     "tuxcord"
     "wheel"
   ];
-    in
-    {
-      error = {
+
+  mkUser = name: uid: options: {
+    users.users.${name} = {
       isNormalUser = true;
-        shell = pkgs.fish;
-        extraGroups = adminGroups;
+      extraGroups = optionals options.admin adminGroups;
+      inherit uid;
     };
 
-      javalsai = {
-        isNormalUser = true;
-        shell = pkgs.zsh;
-        extraGroups = adminGroups;
+    systemd.slices."user-${uid}".sliceConfig = {
+      CPUQuota = "50%";
+      CPUWeight = "10";
+      IOAccounting = true;
+      IOWeight = "10";
+      MemoryMax = "2G";
+      MemorySwapMax = "1G";
+      TasksMax = "100";
     };
   };
+in
+map (user: mkUser user.name user.uid user.options) [
+  {
+    name = "error";
+    uid = 1000;
+    options.admin = true;
   }
+  {
+    name = "javalsai";
+    uid = 1001;
+    options.admin = true;
+  }
+  {
+    name = "max";
+    uid = 1002;
+    options.admin = true;
+  }
+  {
+    name = "vectorum";
+    uid = 1003;
+  }
+]