From 14bff0679f0f811d6b99db051c9419ae8cfa7b32 Mon Sep 17 00:00:00 2001
From: Michael Hobbs <michaelshanehobbs@gmail.com>
Date: Mon, 2 Feb 2015 15:46:57 -0800
Subject: [PATCH] only execute build stack if we have access to
 /var/run/docker.sock. closes #929

---
 Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Makefile b/Makefile
index 2d85dd334..0f152e5ab 100644
--- a/Makefile
+++ b/Makefile
@@ -95,12 +95,14 @@ ifndef CI
 endif
 
 stack:
+ifeq ($(shell test -e /var/run/docker.sock && touch -a -c /var/run/docker.sock && echo $$?),0)
 	@echo "Start building buildstep"
 ifdef BUILD_STACK
 	@docker images | grep progrium/buildstep || (git clone ${STACK_URL} /tmp/buildstep && docker build -t progrium/buildstep /tmp/buildstep && rm -rf /tmp/buildstep)
 else
 	@docker images | grep progrium/buildstep || curl --silent -L ${PREBUILT_STACK_URL} | gunzip -cd | docker import - progrium/buildstep
 endif
+endif
 
 count:
 	@echo "Core lines:"