From e23dce108588a9c52d3f7542636892750d6efcbd Mon Sep 17 00:00:00 2001
From: Marek Czernek <marek.czernek@suse.com>
Date: Thu, 17 Oct 2024 15:52:00 +0200
Subject: [PATCH] Handle logger flushing already closed file (#686)

This is a partial cherry-pick of
https://github.com/saltstack/salt/commit/9683260d61668da8559ecde6caf63a52fedd8790
---
 salt/_logging/handlers.py |  4 ++++
 salt/_logging/impl.py     | 10 +++++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/salt/_logging/handlers.py b/salt/_logging/handlers.py
index 5a1a1613137..d8bc68a49db 100644
--- a/salt/_logging/handlers.py
+++ b/salt/_logging/handlers.py
@@ -95,6 +95,9 @@ class DeferredStreamHandler(StreamHandler):
         super().__init__(stream)
         self.__messages = deque(maxlen=max_queue_size)
         self.__emitting = False
+        import traceback
+
+        self.stack = "".join(traceback.format_stack())
 
     def handle(self, record):
         self.acquire()
@@ -116,6 +119,7 @@ class DeferredStreamHandler(StreamHandler):
                 super().handle(record)
             finally:
                 self.__emitting = False
+        # This will raise a ValueError if the file handle has been closed.
         super().flush()
 
     def sync_with_handlers(self, handlers=()):
diff --git a/salt/_logging/impl.py b/salt/_logging/impl.py
index 4d1ebd2495f..9d76c3174e2 100644
--- a/salt/_logging/impl.py
+++ b/salt/_logging/impl.py
@@ -488,7 +488,15 @@ def setup_temp_handler(log_level=None):
             break
     else:
         handler = DeferredStreamHandler(sys.stderr)
-        atexit.register(handler.flush)
+
+        def tryflush():
+            try:
+                handler.flush()
+            except ValueError:
+                # File handle has already been closed.
+                pass
+
+        atexit.register(tryflush)
     handler.setLevel(log_level)
 
     # Set the default temporary console formatter config
-- 
2.47.0