ejabberd: export HOME

Ejabberd 25.04 (and likely earlier versions) require the HOME directory
to be defined in order to start.  Without it, ejabberd will abort with
following error message:

[critical] Failed to start ejabberd application: Exception occurred during configuration processing.
This is most likely due to faulty/incompatible validator in third-party code. If you are not running any third-party code, please report the bug with ejabberd configuration file attached and the following stacktrace included:
** exception error: no match of right hand side value error
   in function  ejabberd_config:get_predefined_keywords/1 (/build/source/src/ejabberd_config.erl, line 506)
   in call from ejabberd_config:validators/3 (/build/source/src/ejabberd_config.erl, line 593)
   in call from ejabberd_config:'-validators/2-fun-0-'/4 (/build/source/src/ejabberd_config.erl, line 366)
   in call from lists:foldl/3 (lists.erl, line 2146)
   in call from ejabberd_config:validators/2 (/build/source/src/ejabberd_config.erl, line 364)
   in call from ejabberd_config:validate/1 (/build/source/src/ejabberd_config.erl, line 710)
   in call from ejabberd_config:read_file/2 (/build/source/src/ejabberd_config.erl, line 637)
   in call from ejabberd_config:load_file/1 (/build/source/src/ejabberd_config.erl, line 737)

References https://github.com/processone/ejabberd/issues/4402

1 files changed, 3 insertions, 0 deletions

diff --git a/modules/ejabberd/default.nix b/modules/ejabberd/default.nix
index 02c060d..48a662f 100644
--- a/modules/ejabberd/default.nix
+++ b/modules/ejabberd/default.nix
@@ -131,6 +131,9 @@ in {
     systemd.services.ejabberd = {
       wantedBy = [ "multi-user.target" ];
       after = [ "network.target" ];
+      environment = {
+        HOME = cfg.stateDir;
+      };
       reloadTriggers = [
         config.environment.etc."ejabberd/ejabberd.yaml".source
         config.environment.etc."ejabberd/ejabberdctl.cfg".source