Prefer environment variables to connect to DB

bin/configuration.py

@@ -17,7 +17,14 @@ def read (file = None):
 	if file is None:
 		file = prefix+"/etc/config.yaml"
 	with open(file, "r") as fd:
-		return _load(fd)
+		cfg = _load(fd)
+
+		if "db" in cfg and "connection_string" in cfg["db"] and os.environ.get("PGDATABASE"):
+			# This should cause the PostgreSQL library to use the environment variables
+			cfg["db"]["connection_string"] = ""
+			print("Using environment variables for database connection")
+
+		return cfg
 
 def files (globspec = None, include_archived = False):
 	"""