From 55154c57851ea3624e01d0e5c2f3622c9f87bc8f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20Benn=C3=A9e?= <alex.bennee@linaro.org>
Date: Wed, 15 Mar 2023 17:43:01 +0000
Subject: [PATCH] tests/docker: all add DOCKER_BUILDKIT to RUNC environment
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It seems we also need to pass DOCKER_BUILDKIT as an argument to docker
itself to get the full benefit of caching.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Suggested-by: Fabiano Rosas <farosas@suse.de>
Tested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20230315174331.2959-3-alex.bennee@linaro.org>
---
 tests/docker/Makefile.include | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/docker/Makefile.include b/tests/docker/Makefile.include
index 54ed77f671..9401525325 100644
--- a/tests/docker/Makefile.include
+++ b/tests/docker/Makefile.include
@@ -39,7 +39,7 @@ docker-qemu-src: $(DOCKER_SRC_COPY)
 # General rule for building docker images.
 docker-image-%: $(DOCKER_FILES_DIR)/%.docker
 	  $(call quiet-command,			\
-		$(RUNC) build				\
+		DOCKER_BUILDKIT=1 $(RUNC) build		\
 		$(if $V,,--quiet)			\
 		$(if $(NOCACHE),--no-cache,		\
 			$(if $(DOCKER_REGISTRY),--cache-from $(DOCKER_REGISTRY)/qemu/$*)) \