make users into module

default.nix

@@ -249,6 +249,7 @@ in
 
   imports = [
     ./mail-server/clamav.nix
+    ./mail-server/users.nix
   ];
 
   config = mkIf cfg.enable {
@@ -275,11 +276,5 @@ in
               hostPrefix domain dkimSelector dkimKeyDirectory;
     };
 
-    users = import ./mail-server/users.nix {
-      inherit lib;
-      inherit (cfg) vmailUIDStart vmailUserName vmailGroupName domain
-      mailDirectory
-              loginAccounts;
-    };
   };
 }

mail-server/users.nix

@@ -14,8 +14,9 @@
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>
 
-{ lib, vmailUIDStart, vmailUserName, vmailGroupName, domain, mailDirectory,
-loginAccounts }:
+{ config, pkgs, lib, ... }:
+
+with config.mailserver;
 
 let
   vmail_user = [{
@@ -40,11 +41,14 @@ let
 
 in
 {
-  # set the vmail gid to a specific value
-  groups = {
-    vmail = { gid = vmailUIDStart; };
-  };
 
-  # define all users
-  extraUsers = vmail_user ++ mail_user;
+  config = lib.mkIf enable {
+    # set the vmail gid to a specific value
+    users.groups = {
+      vmail = { gid = vmailUIDStart; };
+    };
+
+    # define all users
+    users.extraUsers = vmail_user ++ mail_user;
+  };
 }