From 543109a5246645299c866b704b29fd39bb2a61d3 Mon Sep 17 00:00:00 2001
From: Alfonso Acosta <fons@weave.works>
Date: Mon, 26 Oct 2015 15:07:35 +0000
Subject: [PATCH] Make Docker version extraction more robust

---
 scope | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scope b/scope
index cb125a2f0..390091a8b 100755
--- a/scope
+++ b/scope
@@ -35,7 +35,8 @@ shift 1
 MIN_DOCKER_VERSION=1.5.0
 
 check_docker_version() {
-    if ! DOCKER_VERSION=$(docker -v | grep -oE "[0-9]+\.[0-9]+\.[0-9]+") || [ -z "$DOCKER_VERSION" ] ; then
+    if ! DOCKER_VERSION=$(docker -v | sed -n 's%^Docker version \([0-9]\{1,\}\.[0-9]\{1,\}\.[0-9]\{1,\}\).*$%\1%p') ||
+       [ -z "$DOCKER_VERSION" ] ; then
         echo "ERROR: Unable to parse docker version" >&2
         exit 1
     fi