From db46676dec24133602bc1c32308c9e78947e834a Mon Sep 17 00:00:00 2001
From: Serene-Arc <serenical@gmail.com>
Date: Tue, 27 Apr 2021 12:54:30 +1000
Subject: [PATCH] Catch error when logfile accessed concurrently

---
 bdfr/downloader.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/bdfr/downloader.py b/bdfr/downloader.py
index 48c4234..5acb7de 100644
--- a/bdfr/downloader.py
+++ b/bdfr/downloader.py
@@ -203,7 +203,13 @@ class RedditDownloader:
             backupCount=backup_count,
         )
         if log_path.exists():
-            file_handler.doRollover()
+            try:
+                file_handler.doRollover()
+            except PermissionError as e:
+                logger.critical(
+                    'Cannot rollover logfile, make sure this is the only '
+                    'BDFR process or specify alternate logfile location')
+                raise
         formatter = logging.Formatter('[%(asctime)s - %(name)s - %(levelname)s] - %(message)s')
         file_handler.setFormatter(formatter)
         file_handler.setLevel(0)