nixos/mailman: add services.mailman.extraConfig

I used this to set up ARC.  I'm sure there are other usecases too.

1 files changed, 7 insertions, 1 deletions

diff --git a/nixpkgs/nixos/modules/services/mail/mailman.nix b/nixpkgs/nixos/modules/services/mail/mailman.nix
index d1b730d36f45..25c1541a44f6 100644
--- a/nixpkgs/nixos/modules/services/mail/mailman.nix
+++ b/nixpkgs/nixos/modules/services/mail/mailman.nix
@@ -59,7 +59,7 @@ let
     class: mailman_hyperkitty.Archiver
     enable: yes
     configuration: /var/lib/mailman/mailman-hyperkitty.cfg
-  '';
+  '' + cfg.extraConfig;
 
   mailmanHyperkittyCfg = pkgs.writeText "mailman-hyperkitty.cfg" ''
     [general]
@@ -143,6 +143,12 @@ in {
         };
       };
 
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        description = "Extra lines for the mailman configuration file";
+      };
+
     };
   };