add option to create extra user groups

Author: redxtech

modules/nixos/base/default.nix

@@ -35,6 +35,12 @@ in {
       description = "Primary user for permissions and defaults.";
     };
 
+    extraGroups = mkOption {
+      type = listOf str;
+      default = [ "plugdev" ];
+      description = "Extra groups to create.";
+    };
+
     tz = mkOption {
       type = str;
       default = "America/Vancouver";
@@ -106,6 +112,12 @@ in {
         (python3.withPackages py-pkgs)
       ];
 
+    # extra groups
+    users.groups = builtins.listToAttrs (map (name: {
+      inherit name;
+      value = { };
+    }) cfg.extraGroups);
+
     # sops
     sops = let
       isEd25519 = k: k.type == "ed25519";