From d9a9abf84505b269c93e55e8ff50aae527623e62 Mon Sep 17 00:00:00 2001
From: grossmj <grossmj@gns3.net>
Date: Sun, 17 Feb 2019 19:21:21 +0800
Subject: [PATCH] Add explicit error when trying to pull a Docker image from
 Docker Hub without Internet access. Fixes #1506.

---
 gns3server/compute/docker/__init__.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gns3server/compute/docker/__init__.py b/gns3server/compute/docker/__init__.py
index f7ee075e..87152338 100644
--- a/gns3server/compute/docker/__init__.py
+++ b/gns3server/compute/docker/__init__.py
@@ -200,7 +200,10 @@ class Docker(BaseManager):
 
         if progress_callback:
             progress_callback("Pulling '{}' from docker hub".format(image))
-        response = yield from self.http_query("POST", "images/create", params={"fromImage": image}, timeout=None)
+        try:
+            response = yield from self.http_query("POST", "images/create", params={"fromImage": image}, timeout=None)
+        except DockerError as e:
+            raise DockerError("Could not pull the '{}' image from Docker Hub, please check your Internet connection (original error: {})".format(image, e))
         # The pull api will stream status via an HTTP JSON stream
         content = ""
         while True: