charybdis service: add option to configure MOTD (#25512)

Read MOTD files from /etc/charybdis.

nixos/modules/services/networking/charybdis.nix

@@ -51,6 +51,17 @@ in
         '';
       };
 
+      motd = mkOption {
+        type = types.nullOr types.lines;
+        default = null;
+        description = ''
+          Charybdis MOTD text.
+
+          Charybdis will read its MOTD from /etc/charybdis/ircd.motd .
+          If set, the value of this option will be written to this path.
+        '';
+      };
+
     };
 
   };
@@ -58,39 +69,42 @@ in
 
   ###### implementation
 
-  config = mkIf cfg.enable {
+  config = mkIf cfg.enable (lib.mkMerge [
-
+    {
-    users.extraUsers = singleton {
+      users.extraUsers = singleton {
-      name = cfg.user;
+        name = cfg.user;
-      description = "Charybdis IRC daemon user";
+        description = "Charybdis IRC daemon user";
-      uid = config.ids.uids.ircd;
+        uid = config.ids.uids.ircd;
-      group = cfg.group;
+        group = cfg.group;
-    };
-
-    users.extraGroups = singleton {
-      name = cfg.group;
-      gid = config.ids.gids.ircd;
-    };
-
-    systemd.services.charybdis = {
-      description = "Charybdis IRC daemon";
-      wantedBy = [ "multi-user.target" ];
-      environment = {
-        BANDB_DBPATH = "${cfg.statedir}/ban.db";
       };
-      serviceConfig = {
+
-        ExecStart   = "${charybdis}/bin/charybdis-ircd -foreground -logfile /dev/stdout -configfile ${configFile}";
+      users.extraGroups = singleton {
-        Group = cfg.group;
+        name = cfg.group;
-        User = cfg.user;
+        gid = config.ids.gids.ircd;
-        PermissionsStartOnly = true; # preStart needs to run with root permissions
       };
-      preStart = ''
-        ${coreutils}/bin/mkdir -p ${cfg.statedir}
-        ${coreutils}/bin/chown ${cfg.user}:${cfg.group} ${cfg.statedir}
-      '';
 
-    };
+      systemd.services.charybdis = {
-
+        description = "Charybdis IRC daemon";
-  };
+        wantedBy = [ "multi-user.target" ];
+        environment = {
+          BANDB_DBPATH = "${cfg.statedir}/ban.db";
+        };
+        serviceConfig = {
+          ExecStart   = "${charybdis}/bin/charybdis-ircd -foreground -logfile /dev/stdout -configfile ${configFile}";
+          Group = cfg.group;
+          User = cfg.user;
+          PermissionsStartOnly = true; # preStart needs to run with root permissions
+        };
+        preStart = ''
+          ${coreutils}/bin/mkdir -p ${cfg.statedir}
+          ${coreutils}/bin/chown ${cfg.user}:${cfg.group} ${cfg.statedir}
+        '';
+      };
 
+    }
+    
+    (mkIf (cfg.motd != null) {
+      environment.etc."charybdis/ircd.motd".text = cfg.motd;
+    })
+  ]);
 }

pkgs/servers/irc/charybdis/default.nix

@@ -19,6 +19,7 @@ stdenv.mkDerivation rec {
     "--enable-ipv6"
     "--enable-openssl=${openssl.dev}"
     "--with-program-prefix=charybdis-"
+    "--sysconfdir=/etc/charybdis"
   ];
 
   buildInputs = [ bison flex openssl ];