From 0314a86e039a5aaf24df1e3f11258155b62db768 Mon Sep 17 00:00:00 2001
From: Tom Wilkie <tom.wilkie@gmail.com>
Date: Mon, 29 Feb 2016 13:00:50 +0000
Subject: [PATCH] Autodetect if we talk to docker via tcp in the Makefile

---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index c29af3ca..c5143979 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ PUBLISH=publish_weave publish_weaveexec publish_plugin
 .PHONY: all exes testrunner update tests lint publish $(PUBLISH) clean clean-bin prerequisites build run-smoketests
 
 # If you can use docker without being root, you can do "make SUDO="
-SUDO=sudo -E
+SUDO=$(shell docker info >/dev/null 2>&1 || echo "sudo -E")
 BUILD_IN_CONTAINER=true
 RM=--rm
 RUN_FLAGS=-ti