UDSRemoteStore: Support the 'root' store parameter

Useful when we're using a daemon with a chroot store, e.g.

  $ NIX_DAEMON_SOCKET_PATH=/tmp/chroot/nix/var/nix/daemon-socket/socket nix-daemon --store /tmp/chroot

Then the client can now connect with

  $ nix build --store unix:///tmp/chroot/nix/var/nix/daemon-socket/socket?root=/tmp/chroot nixpkgs#hello

1 files changed, 2 insertions, 2 deletions

diff --git a/src/nix/run.cc b/src/nix/run.cc
index f684c5ea4..c0ba05a3e 100644
--- a/src/nix/run.cc
+++ b/src/nix/run.cc
@@ -43,8 +43,8 @@ struct RunCommon : virtual Command
            helper program (chrootHelper() below) to do the work. */
         auto store2 = store.dynamic_pointer_cast<LocalStore>();
 
-        if (store2 && store->storeDir != store2->realStoreDir) {
-            Strings helperArgs = { chrootHelperName, store->storeDir, store2->realStoreDir, program };
+        if (store2 && store->storeDir != store2->getRealStoreDir()) {
+            Strings helperArgs = { chrootHelperName, store->storeDir, store2->getRealStoreDir(), program };
             for (auto & arg : args) helperArgs.push_back(arg);
 
             execv(readLink("/proc/self/exe").c_str(), stringsToCharPtrs(helperArgs).data());