gh-103606: Improve error message from logging.config.FileConfig (GH-103628)

1 files changed, 16 insertions, 6 deletions

diff --git a/Lib/logging/config.py b/Lib/logging/config.py
index 16c54a6..652f21e 100644
--- a/Lib/logging/config.py
+++ b/Lib/logging/config.py
@@ -29,6 +29,7 @@ import functools
 import io
 import logging
 import logging.handlers
+import os
 import queue
 import re
 import struct
@@ -60,15 +61,24 @@ def fileConfig(fname, defaults=None, disable_existing_loggers=True, encoding=Non
     """
     import configparser
 
+    if isinstance(fname, str):
+        if not os.path.exists(fname):
+            raise FileNotFoundError(f"{fname} doesn't exist")
+        elif not os.path.getsize(fname):
+            raise ValueError(f'{fname} is an empty file')
+
     if isinstance(fname, configparser.RawConfigParser):
         cp = fname
     else:
-        cp = configparser.ConfigParser(defaults)
-        if hasattr(fname, 'readline'):
-            cp.read_file(fname)
-        else:
-            encoding = io.text_encoding(encoding)
-            cp.read(fname, encoding=encoding)
+        try:
+            cp = configparser.ConfigParser(defaults)
+            if hasattr(fname, 'readline'):
+                cp.read_file(fname)
+            else:
+                encoding = io.text_encoding(encoding)
+                cp.read(fname, encoding=encoding)
+        except configparser.ParsingError as e:
+            raise ValueError(f'{fname} is invalid: {e}')
 
     formatters = _create_formatters(cp)