From bb58040d9ccad511f54b1b772017b60a264efca2 Mon Sep 17 00:00:00 2001
From: Nick Craig-Wood <nick@craig-wood.com>
Date: Sun, 3 Sep 2023 12:37:20 +0100
Subject: [PATCH] s3: fix multpart streaming uploads of 0 length files

---
 backend/s3/s3.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/backend/s3/s3.go b/backend/s3/s3.go
index 2ec6ce98e..02fe34d5f 100644
--- a/backend/s3/s3.go
+++ b/backend/s3/s3.go
@@ -5427,8 +5427,8 @@ func (w *s3ChunkWriter) WriteChunk(ctx context.Context, chunkNumber int, reader
 	if err != nil {
 		return -1, err
 	}
-	// If no data read, don't write the chunk
-	if currentChunkSize == 0 {
+	// If no data read and not the first chunk, don't write the chunk
+	if currentChunkSize == 0 && chunkNumber != 0 {
 		return 0, nil
 	}
 	md5sumBinary := m.Sum([]byte{})