4 files changed, 12 insertions, 1 deletions
diff --git a/src/libexpr/flake/flake.cc b/src/libexpr/flake/flake.cc
index c9d848495..07ed3caa2 100644
--- a/src/libexpr/flake/flake.cc
+++ b/src/libexpr/flake/flake.cc
@@ -307,7 +307,7 @@ LockedFlake lockFlake(
 
     if (lockFlags.applyNixConfig) {
         flake.config.apply();
-        // FIXME: send new config to the daemon.
+        state.store->setOptions();
     }
 
     try {
diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index 7decc059c..274203f8d 100644
--- a/src/libstore/remote-store.cc
+++ b/src/libstore/remote-store.cc
@@ -290,6 +290,10 @@ ConnectionHandle RemoteStore::getConnection()
     return ConnectionHandle(connections->get());
 }
 
+void RemoteStore::setOptions()
+{
+    setOptions(*(getConnection().handle));
+}
 
 bool RemoteStore::isValidPathUncached(const StorePath & path)
 {
diff --git a/src/libstore/remote-store.hh b/src/libstore/remote-store.hh
index a3036e6b0..5f6da9af5 100644
--- a/src/libstore/remote-store.hh
+++ b/src/libstore/remote-store.hh
@@ -147,6 +147,8 @@ protected:
 
     virtual void setOptions(Connection & conn);
 
+    void setOptions() override;
+
     ConnectionHandle getConnection();
 
     friend struct ConnectionHandle;
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index 7d02340df..8472e726a 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -724,6 +724,11 @@ public:
     virtual void createUser(const std::string & userName, uid_t userId)
     { }
 
+    /*
+     * Synchronises the options of the client with those of the daemon
+     * (a no-op when there’s no daemon)
+     */
+    virtual void setOptions() { }
 protected:
 
     Stats stats;