task_runner: always use run_isolated

client/utils/logging_utils.py

 # Copyright 2015 The LUCI Authors. All rights reserved.
 # Use of this source code is governed by the Apache v2.0 license that can be
 # found in the LICENSE file.
 
 """Utility relating to logging."""
 
 import argparse
 import codecs
 import ctypes
 import logging
 import logging.handlers
 import optparse
 import os
 import sys
 import tempfile
 import time
 
+import file_path
 
 # This works around file locking issue on Windows specifically in the case of
 # long lived child processes.
 #
 # Python opens files with inheritable handle and without file sharing by
 # default. This causes the RotatingFileHandler file handle to be duplicated in
 # the subprocesses even if the log file is not used in it. Because of this
 # handle in the child process, when the RotatingFileHandler tries to os.rename()
 # the file in the parent process, it fails with:
 #     WindowsError: [Error 32] The process cannot access the file because
@@ skipping 164 matching lines @@
   stderr = logging.StreamHandler()
   stderr.setFormatter(formatter)
   stderr.addFilter(Filter())
   # Default to ERROR.
   stderr.setLevel(logging.ERROR)
   logger.addHandler(stderr)
 
   # Setup up logging to a constant file so we can debug issues where
   # the results aren't properly sent to the result URL.
   if filename:
+    file_path.ensure_tree(os.path.dirname(os.path.abspath(unicode(filename))))
     try:
       rotating_file = NoInheritRotatingFileHandler(
           filename, maxBytes=10 * 1024 * 1024, backupCount=5,
           encoding='utf-8')
       rotating_file.setLevel(logging.DEBUG)
       rotating_file.setFormatter(formatter)
       rotating_file.addFilter(Filter())
       logger.addHandler(rotating_file)
     except Exception:
       # May happen on cygwin. Do not crash.
@@ skipping 79 matching lines @@
 
   def parse_args(self, *args, **kwargs):
     # Make sure this group is always the last one.
     self._add_logging_group()
 
     args = super(ArgumentParserWithLogging, self).parse_args(*args, **kwargs)
     prepare_logging(self.enable_log_file and args.log_file, self.logger_root)
     set_console_level(
         LEVELS[min(len(LEVELS) - 1, args.verbose)], self.logger_root)
     return args