check for internet connectivity, and stop execution if there is none

1 files changed, 13 insertions, 0 deletions

diff --git a/src/backend/checkenv.py b/src/backend/checkenv.py
index c8152bf..124ba76 100644
--- a/src/backend/checkenv.py
+++ b/src/backend/checkenv.py
@@ -3,6 +3,19 @@
 import os
 import subprocess
 import sisyphus.getenv
+import urllib.request
+
+
+def connectivity():
+    is_online = int()
+
+    try:
+        urllib.request.urlopen("http://www.google.com", timeout=5)
+        is_online = int(1)
+    except urllib.error.URLError:
+        is_online = int(0)
+
+    return is_online
 
 
 def root():