fix service by adding env variables to make update work properly (#80)

src/update.py

@@ -2,6 +2,7 @@ import ast
 import os
 import subprocess
 import config
+import logging
 
 def get_assignments(filename):
     with open(filename) as f:
@@ -54,9 +55,10 @@ def check_git_version_remote(script_dir):
         result = subprocess.Popen(full_cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()[0].decode("utf-8")
     except subprocess.CalledProcessError as e:
         print("Error: {}".format(e))
-        return "0"
+        return config.version
     
     latest_tag = result.strip()
+    logging.info("git update:" + result + script_dir)
     return latest_tag if latest_tag else "0"