From c22936ca6ad68630f2982a62245b91b11c4fb699 Mon Sep 17 00:00:00 2001
From: Ben Radford <benradf@users.noreply.github.com>
Date: Tue, 16 May 2023 13:56:29 +0100
Subject: [PATCH] Do not attempt to migrate to CA schema when read-only.

---
 src/libstore/local-store.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index 94176c62f..5d9e96441 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -348,7 +348,7 @@ LocalStore::LocalStore(const Params & params)
 
     else openDB(*state, false);
 
-    if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
+    if (!readOnly && experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
         migrateCASchema(state->db, dbDir + "/ca-schema", globalLock);
     }