From 1a5dac45748541c82de85bdc1b6f325504941713 Mon Sep 17 00:00:00 2001
From: Tibor Vass <tibor@docker.com>
Date: Tue, 22 May 2018 23:23:15 +0000
Subject: [PATCH] build: error out if buildkit is on and stdin is used for both
 dockerfile and context

Signed-off-by: Tibor Vass <tibor@docker.com>
Upstream-commit: 89e102474c26dae2ee70af6395b6778880cbf0d2
Component: cli
---
 components/cli/cli/command/image/build.go          | 4 +++-
 components/cli/cli/command/image/build_buildkit.go | 3 +++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/components/cli/cli/command/image/build.go b/components/cli/cli/command/image/build.go
index b8dd40894e..a329378350 100644
--- a/components/cli/cli/command/image/build.go
+++ b/components/cli/cli/command/image/build.go
@@ -35,6 +35,8 @@ import (
 	"github.com/spf13/cobra"
 )
 
+var errStdinConflict = errors.New("invalid argument: can't use stdin for both build context and dockerfile")
+
 type buildOptions struct {
 	context        string
 	dockerfileName string
@@ -192,7 +194,7 @@ func runBuild(dockerCli command.Cli, options buildOptions) error {
 
 	if options.dockerfileFromStdin() {
 		if options.contextFromStdin() {
-			return errors.New("invalid argument: can't use stdin for both build context and dockerfile")
+			return errStdinConflict
 		}
 		dockerfileCtx = dockerCli.In()
 	}
diff --git a/components/cli/cli/command/image/build_buildkit.go b/components/cli/cli/command/image/build_buildkit.go
index 808d05c90b..d678d78a3c 100644
--- a/components/cli/cli/command/image/build_buildkit.go
+++ b/components/cli/cli/command/image/build_buildkit.go
@@ -51,6 +51,9 @@ func runBuildBuildKit(dockerCli command.Cli, options buildOptions) error {
 	)
 	switch {
 	case options.contextFromStdin():
+		if options.dockerfileFromStdin() {
+			return errStdinConflict
+		}
 		rc, isArchive, err := build.DetectArchiveReader(os.Stdin)
 		if err != nil {
 			return err