search for config file

PDMameUpdate.py

@@ -48,6 +48,7 @@ import os
 import re
 import requests
 import time
+import pathlib
 from clutch.core import Client
 from tabulate import tabulate
 from collections import defaultdict
@@ -58,8 +59,16 @@ from urllib.parse import quote
 def open_config_file():
     """Reads configuration from config.json file"""
 
-    logging.info('Opening config file: config.json')
-    with open('config.json') as config_file:
+    for loc in os.environ.get("PDMAMEUPDATE_CONF"), "/etc", os.path.expanduser("~"), os.curdir:
+        if loc is not None:
+            config_path = loc + '/config.json'
+            if pathlib.Path(config_path).is_file():
+               config_file_loc = config_path
+               break
+
+    logging.info('Opening config file: '+config_file_loc)
+    config_file = None;
+    with open(config_file_loc, 'r') as config_file:
         config = json.load(config_file)
         return config