From aaebcf586613ee965c2fa09d28498572340bdc7d Mon Sep 17 00:00:00 2001
From: Justin Cormack <justin.cormack@docker.com>
Date: Tue, 12 Apr 2016 15:38:12 +0100
Subject: [PATCH] be better at checking strings which aere mainly empty

Signed-off-by: Justin Cormack <justin.cormack@docker.com>
---
 alpine/packages/mobyconfig/mobyconfig | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/alpine/packages/mobyconfig/mobyconfig b/alpine/packages/mobyconfig/mobyconfig
index b93d22654..e22ba3ab6 100755
--- a/alpine/packages/mobyconfig/mobyconfig
+++ b/alpine/packages/mobyconfig/mobyconfig
@@ -38,8 +38,10 @@ KEY=$(echo $2 | sed 's@^/@@')
 if [ $1 == "exists" ]
 then
   [ -d ${BASE}/${KEY} ] && exit 0
-  [ -f ${BASE}/${KEY} -a ! -z "$(cat ${BASE}/${KEY})" ] && exit 0
-  exit 1
+  [ -f ${BASE}/${KEY} ] || exit 1
+  VALUE="$(cat ${BASE}/${KEY} | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')"
+  [ -z "${VALUE}" ] && exit 1
+  exit 0
 fi
 
 if [ $1 == "dir" ]