libstore: turn copyNAR into a generator

Change-Id: Id452f6a03faa1037ff13af0f63e32883966ff40d

1 files changed, 1 insertions, 2 deletions

diff --git a/src/libstore/daemon.cc b/src/libstore/daemon.cc
index 52e8ab32e..f7b6a38a1 100644
--- a/src/libstore/daemon.cc
+++ b/src/libstore/daemon.cc
@@ -463,7 +463,7 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
                        command. (We don't trust `addToStoreFromDump` to not
                        eagerly consume the entire stream it's given, past the
                        length of the Nar. */
-                    copyNAR(from, saved);
+                    saved << copyNAR(from);
                 } else {
                     /* Incrementally parse the NAR file, stripping the
                        metadata, and streaming the sole file we expect into
@@ -884,7 +884,6 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
 
         else {
             std::unique_ptr<Source> source;
-            StringSink saved;
             source = std::make_unique<TunnelSource>(from, to);
 
             logger->startWork();