From 67c19d64cb00485ef32dd9a89f6987cd20e76d01 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Tue, 17 Jun 2025 11:16:13 +0200
Subject: ejabberd: ensure PREVIOUS.LOG exists

This fixes an issue causing ejabberd to abort with following error
message:

** FATAL ** {error,{"Cannot rename disk_log file",latest_log,
                    "/var/lib/ejabberd/PREVIOUS.LOG",
                    {log_header,trans_log,"4.3","4.20.4.1",
                                ejabberd@localhost,
                                {1665,261856,453060}},
                    {file_error,"/var/lib/ejabberd/PREVIOUS.LOG",erofs}}}
---
 modules/ejabberd/default.nix | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/modules/ejabberd/default.nix b/modules/ejabberd/default.nix
index f2da590..9607741 100644
--- a/modules/ejabberd/default.nix
+++ b/modules/ejabberd/default.nix
@@ -142,6 +142,17 @@ in {
         ExecStartPre = [
           "${pkgs.coreutils}/bin/ln -s \${CREDENTIALS_DIRECTORY} /tmp/credentials"
           "${gen-dhparam} ${cfg.stateDir}/dhfile"
+          (pkgs.writeDash "ejabberd-ensure-PREVIOUS.LOG" ''
+            set -efu
+            cd ${cfg.stateDir}
+            if ! test -e PREVIOUS.LOG; then
+              if test -f LATEST.LOG; then
+                ${pkgs.coreutils}/bin/ln LATEST.LOG PREVIOUS.LOG
+              else
+                ${pkgs.coreutils}/bin/touch PREVIOUS.LOG
+              fi
+            fi
+          '')
         ];
         ExecStart = "${cfg.pkgs.ejabberd}/bin/ejabberdctl foreground";
         ExecStop = [
-- 
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