From 327b1bf378ebdfe7acc6357b651470b45cb44472 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 4 Aug 2020 14:50:43 +0200
Subject: [PATCH] BinaryCacheStore: Explicitly flush file sink

The file sink is also flushed in its destructor, but we ignore any
exceptions in the destructor.

Issue #3886.
---
 src/libstore/binary-cache-store.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libstore/binary-cache-store.cc b/src/libstore/binary-cache-store.cc
index 3d3195e03..7d103e0cc 100644
--- a/src/libstore/binary-cache-store.cc
+++ b/src/libstore/binary-cache-store.cc
@@ -169,6 +169,7 @@ void BinaryCacheStore::addToStore(const ValidPathInfo & info, Source & narSource
     TeeSource teeSource(narSource, *compressionSink);
     narAccessor = makeNarAccessor(teeSource);
     compressionSink->finish();
+    fileSink.flush();
     }
 
     auto now2 = std::chrono::steady_clock::now();