From aba294cbb1ec4af8f35e9403fc3c4bd328255735 Mon Sep 17 00:00:00 2001
From: Soshi Katsuta <katsuta_soshi@cyberagent.co.jp>
Date: Thu, 30 Jul 2015 19:12:26 +0900
Subject: [PATCH] libmachine: return an error if DOCKER_HOST is empty

Signed-off-by: Soshi Katsuta <soshi.katsuta@gmail.com>
---
 libmachine/filestore.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libmachine/filestore.go b/libmachine/filestore.go
index d2c4115848..aa2651ff68 100644
--- a/libmachine/filestore.go
+++ b/libmachine/filestore.go
@@ -126,6 +126,10 @@ func (s Filestore) GetActive() (*Host, error) {
 	}
 
 	dockerHost := os.Getenv("DOCKER_HOST")
+	if dockerHost == "" {
+		return nil, errors.New("DOCKER_HOST not set")
+	}
+
 	hostListItems := GetHostListItems(hosts)
 
 	for _, item := range hostListItems {