Convert arguments to ''.join() to strings in tools/utils.py

tools/utils.py

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # This file contains a set of utilities functions used by other Python-based
 # scripts.
 
 import commands
 import contextlib
 import datetime
@@ skipping 678 matching lines @@
     os.chdir(self._working_directory)
 
   def __exit__(self, *_):
     print "Enter directory = ", self._old_cwd
     os.chdir(self._old_cwd)
 
 
 class UnexpectedCrash(object):
   def __init__(self, test, pid, binary):
     self.test = test
-    self.pid = pid 
+    self.pid = pid
     self.binary = binary
 
   def __str__(self):
     return "%s: %s %s" % (self.test, self.binary, self.pid)
 
 
 class PosixCoredumpEnabler(object):
   def __init__(self):
     self._old_limits = None
 
@@ skipping 132 matching lines @@
     missing = []
     for crash in crashes:
       files.add(crash.binary)
       core = self._find_coredump_file(crash)
       if core:
         files.add(core)
       else:
         missing.append(crash)
     self._upload(files)
     if missing:
-      raise Exception('Missing crash dumps for: %s' % ', '.join(missing))
+      raise Exception('Missing crash dumps for: %s' % ', '.join(
+          [str(c) for c in missing]))
 
   def _upload(self, files):
     bot_utils = GetBotUtils()
     gsutil = bot_utils.GSUtil()
     storage_path = '%s/%s/' % (self._bucket, uuid.uuid4())
     gs_prefix = 'gs://%s' % storage_path
     http_prefix = 'https://storage.cloud.google.com/%s' % storage_path
 
     print '\n--- Uploading into %s (%s) ---' % (gs_prefix, http_prefix)
     for file in files:
@@ skipping 99 matching lines @@
     return contextlib.nested(WindowsCoredumpEnabler(),
                              WindowsCoreDumpArchiver())
   else:
     # We don't have support for MacOS yet.
     assert osname == 'macos'
     return NooptCoreDumpArchiver()
 
 if __name__ == "__main__":
   import sys
   Main()