* Implement a file handler with 'rotate'. This closes the file, attempts

  a rename to {filename}.last, then reopens the original name.  This
  then makes the log available for another process to perform the rotation
  logic on. This log handler is only installed on the Windows
  platform, where you can't rename an open file.

lib/python/ZConfig/components/logger/loghandler.py

@@ -13,7 +13,7 @@
 
 """Handlers which can plug into a PEP 282 logger."""
 
-import os.path
+import os
 import sys
 
 from logging import Handler, StreamHandler
@@ -42,6 +42,27 @@ class FileHandler(StreamHandler):
         self.close()
         self.stream = open(self.baseFilename, self.mode)
 
+class Win32FileHandler(FileHandler):
+    """File-based log handler for Windows that supports an additional 'rotate'
+    method.  reopen() is generally useless since Windows cannot do a move on
+    an open file.
+    """
+    def rotate(self, rotateFilename=None):
+        if not rotateFilename:
+            rotateFilename = self.baseFilename + ".last"
+        error = None
+        self.close()
+        try:
+            os.rename(self.baseFilename, rotateFilename)
+        except OSError:
+            pass
+
+        self.stream = open(self.baseFilename, self.mode)
+
+if os.name == "nt":
+    # Make it the default for Windows - we install a 'reopen' handler that
+    # tries to rotate the logfile.
+    FileHandler = Win32FileHandler
 
 class NullHandler(Handler):
     """Handler that does nothing."""