Fix the prompt so the user can interact with svn.

trychange.py

 #!/usr/bin/python
 # Copyright (c) 2009 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.
 """Client-side script to send a try job to the try server. It communicates to
 the try server by either writting to a svn repository or by directly connecting
 to the server by HTTP.
 """
 
 
 import datetime
 import getpass
 import logging
 import optparse
 import os
 import shutil
 import socket
+import subprocess
 import sys
 import tempfile
 import traceback
 import urllib
 
 import gcl
 import gclient
 import gclient_scm
 import upload
 
@@ skipping 282 matching lines @@
   for (k,v) in values.iteritems():
     description += "%s=%s\n" % (k,v)
 
   # Do an empty checkout.
   temp_dir = tempfile.mkdtemp()
   temp_file = tempfile.NamedTemporaryFile()
   temp_file_name = temp_file.name
   try:
     # Don't use  '--non-interactive', since we want it to prompt for
     # crendentials if necessary.
-    command = ['svn', 'checkout', '--depth', 'empty',
+    command = ['svn', 'checkout', '--depth', 'empty', '-q',
                options.svn_repo, temp_dir]
     if options.email:
       command += ['--username', options.email]
-    RunCommand(command)
+    # Don't use RunCommand() since svn may prompt for information.
+    use_shell = sys.platform.startswith("win")
+    subprocess.Popen(command, shell=use_shell).communicate()
+
     # TODO(maruel): Use a subdirectory per user?
     current_time = str(datetime.datetime.now()).replace(':', '.')
     file_name = (EscapeDot(options.user) + '.' + EscapeDot(options.name) +
                  '.%s.diff' % current_time)
     full_path = os.path.join(temp_dir, file_name)
     full_url = options.svn_repo + '/' + file_name
     file_found = False
     try:
       RunCommand(['svn', 'ls', full_url])
       file_found = True
@@ skipping 197 matching lines @@
     if patch_name == 'Unnamed':
       print "Note: use --name NAME to change the try's name."
   except (InvalidScript, NoTryServerAccess), e:
     if swallow_exception:
       return
     print e
 
 
 if __name__ == "__main__":
   TryChange(None, None, False)