From 0bd43aa1dc505b096f81f9e7cc7a42579185b5ca Mon Sep 17 00:00:00 2001
From: ktock <ktokunaga.mail@gmail.com>
Date: Sat, 21 Nov 2020 15:05:12 +0900
Subject: [PATCH] Check remote snapshot availability only for stargz

Signed-off-by: ktock <ktokunaga.mail@gmail.com>
---
 cache/refs.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/cache/refs.go b/cache/refs.go
index 2b25235e..2a8aeb30 100644
--- a/cache/refs.go
+++ b/cache/refs.go
@@ -399,8 +399,10 @@ func (sr *immutableRef) Extract(ctx context.Context, s session.Group) (rerr erro
 		ctx = winlayers.UseWindowsLayerMode(ctx)
 	}
 
-	if _, err := sr.prepareRemoteSnapshots(ctx, sr.descHandlers); err != nil {
-		return err
+	if sr.cm.Snapshotter.Name() == "stargz" {
+		if _, err := sr.prepareRemoteSnapshots(ctx, sr.descHandlers); err != nil {
+			return err
+		}
 	}
 
 	return sr.extract(ctx, sr.descHandlers, s)