From 6ee61426da640dfb9813c3791cd245dc0bc4b6de Mon Sep 17 00:00:00 2001
From: Martin Weinelt <hexa@darmstadt.ccc.de>
Date: Mon, 31 May 2021 03:21:51 +0200
Subject: [PATCH] nixos/solanum: implement reload and allow config changes

Reload only works with a static configuration path as there is no way to
pass the dynamically generated config path to a running solanum
instance, therefore we symlink the configuration to
/etc/solanum/ircd.conf.

But that will prevent reloads of the ircd, because the systemd unit
wouldn't change when the configuration changes. That is why we add the
actual location of the config file to restartTriggers and enable
reloadIfChanged, so changes will not restart, but reload on changes.

(cherry picked from commit 60c62214f5a3c7db6aa30d8a8e02c863b6abcf0a)
---
 nixos/modules/services/networking/solanum.nix | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/nixos/modules/services/networking/solanum.nix b/nixos/modules/services/networking/solanum.nix
index b6496fb8b35..dc066a24549 100644
--- a/nixos/modules/services/networking/solanum.nix
+++ b/nixos/modules/services/networking/solanum.nix
@@ -2,7 +2,7 @@
 
 let
   inherit (lib) mkEnableOption mkIf mkOption types;
-  inherit (pkgs) solanum;
+  inherit (pkgs) solanum util-linux;
   cfg = config.services.solanum;
 
   configFile = pkgs.writeText "solanum.conf" cfg.config;
@@ -78,12 +78,20 @@ in
 
   config = mkIf cfg.enable (lib.mkMerge [
     {
+
+      environment.etc."solanum/ircd.conf".source = configFile;
+
       systemd.services.solanum = {
         description = "Solanum IRC daemon";
         after = [ "network.target" ];
         wantedBy = [ "multi-user.target" ];
+        reloadIfChanged = true;
+        restartTriggers = [
+          configFile
+        ];
         serviceConfig = {
-          ExecStart   = "${solanum}/bin/solanum -foreground -logfile /dev/stdout -configfile ${configFile} -pidfile /run/solanum/ircd.pid";
+          ExecStart = "${solanum}/bin/solanum -foreground -logfile /dev/stdout -configfile /etc/solanum/ircd.conf -pidfile /run/solanum/ircd.pid";
+          ExecReload = "${util-linux}/bin/kill -HUP $MAINPID";
           DynamicUser = true;
           User = "solanum";
           StateDirectory = "solanum";