vendor: github.com/moby/buildkit 5ae9b23c40a9 (master / v0.13.0-dev)

full diff:

- 36ef4d8c0d...f098008783
- d5c1d785b0...5ae9b23c40

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor/github.com/moby/buildkit/session/filesync/diffcopy.go

@@ -47,6 +47,22 @@ type streamWriterCloser struct {
 }
 
 func (wc *streamWriterCloser) Write(dt []byte) (int, error) {
+	// grpc-go has a 4MB limit on messages by default. Split large messages
+	// so we don't get close to that limit.
+	const maxChunkSize = 3 * 1024 * 1024
+	if len(dt) > maxChunkSize {
+		n1, err := wc.Write(dt[:maxChunkSize])
+		if err != nil {
+			return n1, err
+		}
+		dt = dt[maxChunkSize:]
+		var n2 int
+		if n2, err = wc.Write(dt); err != nil {
+			return n1 + n2, err
+		}
+		return n1 + n2, nil
+	}
+
 	if err := wc.ClientStream.SendMsg(&BytesMessage{Data: dt}); err != nil {
 		// SendMsg return EOF on remote errors
 		if errors.Is(err, io.EOF) {