From 5fa03a4a8e4e0510bff21918ec919b0003bb7497 Mon Sep 17 00:00:00 2001
From: Sebastiaan van Stijn <github@gone.nl>
Date: Thu, 18 Jul 2019 11:01:07 +0200
Subject: [PATCH] Dockerfile: use GO_VERSION build-arg for overriding Go
 version

This allows overriding the version of Go without making modifications in the
source code, which can be useful to test against multiple versions.

For example:

    make GO_VERSION=1.13beta1 build

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
---
 libnetwork/Dockerfile | 4 +++-
 libnetwork/Makefile   | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/libnetwork/Dockerfile b/libnetwork/Dockerfile
index dd4787abb7..20a04a437f 100644
--- a/libnetwork/Dockerfile
+++ b/libnetwork/Dockerfile
@@ -1,4 +1,6 @@
-FROM golang:1.12.6 as dev
+ARG GO_VERSION=1.12.6
+
+FROM golang:${GO_VERSION} as dev
 RUN apt-get update && apt-get -y install iptables \
 		protobuf-compiler
 
diff --git a/libnetwork/Makefile b/libnetwork/Makefile
index 90f2a36625..9edc922e77 100644
--- a/libnetwork/Makefile
+++ b/libnetwork/Makefile
@@ -36,7 +36,7 @@ all-local: build-local check-local clean
 # builder builds the libnetworkbuild container.  All wrapper targets
 # must depend on this to ensure that the container exists.
 builder:
-	docker build -t ${build_image} ${dockerbuildargs}
+	docker build -t ${build_image} --build-arg=GO_VERSION ${dockerbuildargs}
 
 build: builder
 	@echo "🐳 $@"