ENH: stop if old config files are used

src/linkahead/configuration.py

@@ -23,8 +23,10 @@
 #
 
 import os
-import yaml
 import warnings
+
+import yaml
+
 try:
     optional_jsonschema_validate = None
     from jsonschema import validate as optional_jsonschema_validate
@@ -32,9 +34,8 @@ except ImportError:
     pass
 
 from configparser import ConfigParser
-
 from os import environ, getcwd
-from os.path import expanduser, join, isfile
+from os.path import expanduser, isfile, join
 
 
 def _reset_config():
@@ -108,6 +109,20 @@ def _read_config_files():
 
     """
     return_var = []
+    if "PYCAOSDBINI" in environ:
+        raise RuntimeError("You have set the old PYCAOSDBINI environment variable. Please use the "
+                           "new PYLINKAHEADINI variable instead and unset the old one.")
+    if os.path.exists(expanduser('~/.pycaosdb.ini')):
+        raise RuntimeError("You have a config file with the old naming scheme (pycaosdb.ini). "
+                           f"Please use the new version and rename\n"
+                           f"{expanduser('~/.pycaosdb.ini')}\n"
+                           f"to\n{expanduser('~/.pylinkahead.ini')}")
+    if os.path.exists(join(getcwd(), "pycaosdb.ini")):
+        raise RuntimeError("You have a config file with the old naming scheme (pycaosdb.ini). "
+                           f"Please use the new version and rename\n"
+                           f"{join(getcwd(), 'pycaosdb.ini')}\n"
+                           f"to\n{join(getcwd(), 'pylinkahead.ini')}")
+
     if "PYLINKAHEADINI" in environ:
         return_var.extend(configure(expanduser(environ["PYLINKAHEADINI"])))
     else: