From e15890c3fee2fda9387041334d1041d236846db5 Mon Sep 17 00:00:00 2001
From: Morgan Jones <me@numin.it>
Date: Sat, 23 Aug 2025 20:05:19 -0700
Subject: [PATCH 1/2] nixos/mattermost: remove fallback charset for MySQL

This was causing issues on newer versions of MariaDB (breaking
NixOS tests) like:

```
Error 1064 (42000): You have an error in your SQL syntax;
check the manual that corresponds to your MariaDB server version
for the right syntax to use near '%2Cutf8' at line 1
```

Since this is simply a fallback character set and all supported versions
of MariaDB support utf8mb4, delete the fallback.

This change should be fully compatible with existing deployments.

(cherry picked from commit 6cc8a8cdb582660c8f33f23ad949f4a5da07ee7a)
---
 nixos/modules/services/web-apps/mattermost.nix | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/nixos/modules/services/web-apps/mattermost.nix b/nixos/modules/services/web-apps/mattermost.nix
index 83c9181ff302..f3d3be43eabc 100644
--- a/nixos/modules/services/web-apps/mattermost.nix
+++ b/nixos/modules/services/web-apps/mattermost.nix
@@ -668,7 +668,7 @@ in
               }
             else if cfg.database.driver == "mysql" then
               {
-                charset = "utf8mb4,utf8";
+                charset = "utf8mb4";
                 writeTimeout = "60s";
                 readTimeout = "60s";
               }
@@ -682,7 +682,7 @@ in
               }
             else if config.mattermost.database.driver == "mysql" then
               {
-                charset = "utf8mb4,utf8";
+                charset = "utf8mb4";
                 writeTimeout = "60s";
                 readTimeout = "60s";
               }

From e4408d52e5581773899dec31e492579c3e68b329 Mon Sep 17 00:00:00 2001
From: Morgan Jones <me@numin.it>
Date: Sat, 23 Aug 2025 22:09:04 -0700
Subject: [PATCH 2/2] mattermost: tests: use UTF-8 for database charset

There is a new test that checks this.

(cherry picked from commit 749675c629bb17deb26e35fe6c7053fe5ed73a55)
---
 pkgs/by-name/ma/mattermost/tests.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/by-name/ma/mattermost/tests.nix b/pkgs/by-name/ma/mattermost/tests.nix
index ed6e9125c435..e481066bb0c8 100644
--- a/pkgs/by-name/ma/mattermost/tests.nix
+++ b/pkgs/by-name/ma/mattermost/tests.nix
@@ -336,7 +336,7 @@ mattermost.overrideAttrs (
 
       # Start Postgres.
       export PGDATA="$NIX_BUILD_TOP/.postgres"
-      initdb -U postgres
+      initdb -E UTF8 -U postgres
       mkdir -p "$PGDATA/run"
       cat <<EOF >> "$PGDATA/postgresql.conf"
       unix_socket_directories = '$PGDATA/run'