From ba08d39187dbdf4449773f0ea076f13f0fdc4ac4 Mon Sep 17 00:00:00 2001
From: Nicolas De Loof <nicolas.deloof@gmail.com>
Date: Thu, 28 Oct 2021 10:28:51 +0200
Subject: [PATCH] add support for DOCKER_DEFAULT_PLATFORM

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>
---
 pkg/compose/build.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkg/compose/build.go b/pkg/compose/build.go
index a1ca2766..5e9dbe2f 100644
--- a/pkg/compose/build.go
+++ b/pkg/compose/build.go
@@ -261,6 +261,13 @@ func (s *composeService) toBuildOptions(project *types.Project, service types.Se
 	}))
 
 	var plats []specs.Platform
+	if platform, ok := project.Environment["DOCKER_DEFAULT_PLATFORM"]; ok {
+		p, err := platforms.Parse(platform)
+		if err != nil {
+			return build.Options{}, err
+		}
+		plats = append(plats, p)
+	}
 	if service.Platform != "" {
 		p, err := platforms.Parse(service.Platform)
 		if err != nil {