From 8207af9460fa7984b2b013567cd20e58d0ac585d Mon Sep 17 00:00:00 2001
From: Nick Craig-Wood <nick@craig-wood.com>
Date: Thu, 31 Aug 2017 21:19:54 +0100
Subject: [PATCH] b2: Fix SHA1 mismatch when downloading files with no SHA1
 #678

Some large files (depending on which version of rclone they were
uploaded with and where they were uploaded from) don't have an SHA1,
so we can't check it in that case.
---
 b2/b2.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/b2/b2.go b/b2/b2.go
index bc93ac7ae..cbdfc9e79 100644
--- a/b2/b2.go
+++ b/b2/b2.go
@@ -1133,7 +1133,7 @@ func (file *openFile) Close() (err error) {
 	// Check the SHA1
 	receivedSHA1 := file.o.sha1
 	calculatedSHA1 := fmt.Sprintf("%x", file.hash.Sum(nil))
-	if receivedSHA1 != calculatedSHA1 {
+	if receivedSHA1 != "" && receivedSHA1 != calculatedSHA1 {
 		return errors.Errorf("object corrupted on transfer - SHA1 mismatch (want %q got %q)", receivedSHA1, calculatedSHA1)
 	}