From a1d899d40043e0f2b438a49f16f8e3d3ff9c1cde Mon Sep 17 00:00:00 2001
From: Djordje Lukic <djordje.lukic@docker.com>
Date: Sat, 3 Apr 2021 12:38:09 +0200
Subject: [PATCH] Fail fast on multi platform build with load

Signed-off-by: Djordje Lukic <djordje.lukic@docker.com>
---
 build/build.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/build/build.go b/build/build.go
index ba7b7780..7aacb0a2 100644
--- a/build/build.go
+++ b/build/build.go
@@ -456,6 +456,9 @@ func toSolveOpt(ctx context.Context, d driver.Driver, multiDriver bool, opt Opti
 			return nil, nil, notSupported(d, driver.OCIExporter)
 		}
 		if e.Type == "docker" {
+			if len(opt.Platforms) > 1 {
+				return nil, nil, errors.Errorf("docker exporter does not currently support exporting manifest lists")
+			}
 			if e.Output == nil {
 				if d.IsMobyDriver() {
 					e.Type = "image"