Don't require --fallback to recover from disappeared binary cache NARs

1 files changed, 5 insertions, 1 deletions

diff --git a/src/libstore/binary-cache-store.cc b/src/libstore/binary-cache-store.cc
index 11fa3cae27a5..76c0a1a891b8 100644
--- a/src/libstore/binary-cache-store.cc
+++ b/src/libstore/binary-cache-store.cc
@@ -218,7 +218,11 @@ void BinaryCacheStore::narFromPath(const Path & storePath, Sink & sink)
     auto info = queryPathInfo(storePath).cast<const NarInfo>();
 
     auto source = sinkToSource([this, url{info->url}](Sink & sink) {
-        getFile(url, sink);
+        try {
+            getFile(url, sink);
+        } catch (NoSuchBinaryCacheFile & e) {
+            throw SubstituteGone(e.what());
+        }
     });
 
     stats.narRead++;