From 1f726635ee4f0a5faebc4c9b9787bc0d76d0ace4 Mon Sep 17 00:00:00 2001
From: Martin Weinelt <hexa@darmstadt.ccc.de>
Date: Tue, 30 Nov 2021 23:30:54 +0100
Subject: [PATCH] nixos/charybdis: implement reload functionality

IRC daemons are highly stateful daemons, so allow config changes without
kicking all server and client connections.

Basically a port of 60c62214f5a3c7db6aa30d8a8e02c863b6abcf0a.
---
 nixos/modules/services/networking/charybdis.nix | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/services/networking/charybdis.nix b/nixos/modules/services/networking/charybdis.nix
index 43829d36e417..ff09c0160cb6 100644
--- a/nixos/modules/services/networking/charybdis.nix
+++ b/nixos/modules/services/networking/charybdis.nix
@@ -85,14 +85,21 @@ in
         "d ${cfg.statedir} - ${cfg.user} ${cfg.group} - -"
       ];
 
+      environment.etc."charybdis/ircd.conf".source = configFile;
+
       systemd.services.charybdis = {
         description = "Charybdis IRC daemon";
         wantedBy = [ "multi-user.target" ];
+        reloadIfChanged = true;
+        restartTriggers = [
+          configFile
+        ];
         environment = {
           BANDB_DBPATH = "${cfg.statedir}/ban.db";
         };
         serviceConfig = {
-          ExecStart   = "${charybdis}/bin/charybdis -foreground -logfile /dev/stdout -configfile ${configFile}";
+          ExecStart   = "${charybdis}/bin/charybdis -foreground -logfile /dev/stdout -configfile /etc/charybdis/ircd.conf";
+          ExecReload = "${coreutils}/bin/kill -HUP $MAINPID";
           Group = cfg.group;
           User = cfg.user;
         };