* Open the connection to the daemon lazily (on demand) so that

read-only operations (like nix-env -qa) work properly when the
  daemon isn't running.

src/libstore/remote-store.hh

@@ -74,6 +74,9 @@ private:
     FdSource from;
     Pid child;
     unsigned int daemonVersion;
+    bool initialised;
+
+    void openConnection();
 
     void processStderr(Sink * sink = 0, Source * source = 0);