From 81c9e91827e7de8836eaa89f1aa5af3f80bc16c3 Mon Sep 17 00:00:00 2001
From: Peter van Dijk <peter.van.dijk@powerdns.com>
Date: Fri, 17 Mar 2023 10:12:47 +0100
Subject: [PATCH] reinstate lmdb-schema-version setting

---
 modules/lmdbbackend/lmdbbackend.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/modules/lmdbbackend/lmdbbackend.cc b/modules/lmdbbackend/lmdbbackend.cc
index 9e51159cb4..f8d566ccc5 100644
--- a/modules/lmdbbackend/lmdbbackend.cc
+++ b/modules/lmdbbackend/lmdbbackend.cc
@@ -668,7 +668,9 @@ LMDBBackend::LMDBBackend(const std::string& suffix)
       uint32_t currentSchemaVersion = currentSchemaVersionAndShards.first;
       // std::cerr<<"current schema version: "<<currentSchemaVersion<<", shards="<<currentSchemaVersionAndShards.second<<std::endl;
 
-      // FIXME: I accidentally took out the code that checks pdns.conf lmdb-schema-version
+      if (getArgAsNum("schema-version") != SCHEMAVERSION) {
+        throw std::runtime_error("This version of the lmdbbackend only supports schema version 5. Configuration demands a lower version. Not starting up.");
+      }
 
       if (currentSchemaVersion > 0 && currentSchemaVersion < 3) {
         throw std::runtime_error("this version of the lmdbbackend can only upgrade from schema v3/v4 to v5. Upgrading from older schemas is not yet supported.");
-- 
2.47.2