Make the flake options work when using the daemon

When setting flake-local options (with the `nixConfig` field), forward
these options to the daemon in case we’re using one.

This is necessary in particular for options like `binary-caches` or
`post-build-hook` to make sense.

Fix <https://github.com/NixOS/nix/commit/343239fc8a1993f707a990c2cd54a41f1fa3de99#r44356843>

3 files changed, 11 insertions, 0 deletions

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;