From 4839f418091becf145d699507fe6fa33cf197125 Mon Sep 17 00:00:00 2001
From: Marc CARRE <carre.marc@gmail.com>
Date: Wed, 26 Oct 2016 12:23:58 +0100
Subject: [PATCH] Improve resolution of Dockerfile since used in both
 Vagrantfile and test/Vagrantfile.

---
 vagrant-common.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/vagrant-common.rb b/vagrant-common.rb
index 9c0c6b5b..125abeea 100644
--- a/vagrant-common.rb
+++ b/vagrant-common.rb
@@ -1,5 +1,6 @@
 $go_regexp = /FROM golang:(\S*).*?/
-$go_version = File.readlines("build/Dockerfile").first { |line| line.match($go_regexp) }.match($go_regexp).captures.first
+$dockerfile_path = File.expand_path(File.join(File.dirname(__FILE__), 'build', 'Dockerfile'))
+$go_version = File.readlines($dockerfile_path).first { |line| line.match($go_regexp) }.match($go_regexp).captures.first
 if $go_version.nil?
   raise ArgumentError.new("Failed to read Go version from Dockerfile.")
 end