luci-py: Making __file__ usage unicode safe.

client/trace_inputs.py

 #!/usr/bin/env python
 # coding=utf-8
 # Copyright 2012 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 """Traces an executable and its child processes and extract the files accessed
 by them.
 
 The implementation uses OS-specific API. The native Kernel logger and the ETL
@@ skipping 36 matching lines @@
 ## OS-specific imports
 
 if sys.platform == 'win32':
   from ctypes.wintypes import byref, c_int, c_wchar_p
   from ctypes.wintypes import windll # pylint: disable=E0611
 
 
 __version__ = '0.2'
 
 
-BASE_DIR = os.path.dirname(os.path.abspath(__file__))
+BASE_DIR = os.path.dirname(os.path.abspath(
+    __file__.decode(sys.getfilesystemencoding())))
 ROOT_DIR = os.path.dirname(os.path.dirname(BASE_DIR))
 
 
 class TracingFailure(Exception):
   """An exception occured during tracing."""
   def __init__(self, description, pid, line_number, line, *args):
     super(TracingFailure, self).__init__(
         description, pid, line_number, line, *args)
     self.description = description
     self.pid = pid
@@ skipping 3328 matching lines @@
     sys.stderr.write('\n')
     return 1
 
 
 if __name__ == '__main__':
   subprocess42.inhibit_os_error_reporting()
   fix_encoding.fix_encoding()
   tools.disable_buffering()
   colorama.init()
   sys.exit(main(sys.argv[1:]))