Print the command line, not ['Print', 'the', 'command', 'line'].

py/utils/shell_utils.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """ This module contains tools for running commands in a shell. """
 
 import datetime
 import os
 import Queue
@@ skipping 35 matching lines @@
   timeout. """
   pass
 
 
 def run_async(cmd, echo=None, shell=False):
   """ Run 'cmd' in a subprocess, returning a Popen class instance referring to
   that process.  (Non-blocking) """
   if echo is None:
     echo = VERBOSE
   if echo:
-    print cmd
+    print ' '.join(cmd) if isinstance(cmd, list) else cmd
   if 'nt' in os.name:
     # Windows has a bad habit of opening a dialog when a console program
     # crashes, rather than just letting it crash.  Therefore, when a program
     # crashes on Windows, we don't find out until the build step times out.
     # This code prevents the dialog from appearing, so that we find out
     # immediately and don't waste time waiting around.
     SEM_NOGPFAULTERRORBOX = 0x0002
     ctypes.windll.kernel32.SetErrorMode(SEM_NOGPFAULTERRORBOX)
     flags = 0x8000000 # CREATE_NO_WINDOW
   else:
@@ skipping 172 matching lines @@
   while True:
     try:
       return run(cmd, echo=echo, shell=shell, timeout=timeout,
                  print_timestamps=print_timestamps)
     except CommandFailedException:
       if attempt >= attempts:
         raise
     print 'Command failed. Retrying in %d seconds...' % secs_between_attempts
     time.sleep(secs_between_attempts)
     attempt += 1