Adding an option to specify a default patchlevel in codereview.settings....

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.
 """
 
 
@@ skipping 76 matching lines @@
     try:
       return socket.getaddrinfo(host, None)
     except socket.gaierror:
       return None
 
   settings = {}
   settings['http_port'] = gcl.GetCodeReviewSetting('TRYSERVER_HTTP_PORT')
   settings['http_host'] = gcl.GetCodeReviewSetting('TRYSERVER_HTTP_HOST')
   settings['svn_repo'] = gcl.GetCodeReviewSetting('TRYSERVER_SVN_URL')
   settings['default_project'] = gcl.GetCodeReviewSetting('TRYSERVER_PROJECT')
+  settings['default_root'] = gcl.GetCodeReviewSetting('TRYSERVER_ROOT')
+
+  # Pick a patchlevel, default to 0.
+  default_patchlevel = gcl.GetCodeReviewSetting('TRYSERVER_PATCHLEVEL')
+  if default_patchlevel:
+    default_patchlevel = int(default_patchlevel)
+  else:
+    default_patchlevel = 0
+  settings['default_patchlevel'] = default_patchlevel
+
   # Use http is the http_host name resolve, fallback to svn otherwise.
   if (settings['http_port'] and settings['http_host'] and
       _SafeResolve(settings['http_host'])):
     settings['default_transport'] = 'http'
   elif settings.get('svn_repo'):
     settings['default_transport'] = 'svn'
   return settings
 
 
 def EscapeDot(name):
@@ skipping 348 matching lines @@
   group.add_option("-f", "--file", default=file_list, dest="files",
                    metavar="FILE", action="append",
                    help="Use many times to list the files to include in the "
                         "try, relative to the repository root")
   group.add_option("--diff",
                    help="File containing the diff to try")
   group.add_option("--url",
                    help="Url where to grab a patch")
   group.add_option("--root",
                    help="Root to use for the patch; base subdirectory for "
-                        "patch created in a subdirectory")
+                        "patch created in a subdirectory",
+                   default=default_settings["default_root"])
   group.add_option("--patchlevel", type='int', metavar="LEVEL",
-                   help="Used as -pN parameter to patch")
+                   help="Used as -pN parameter to patch",
+                   default=default_settings["default_patchlevel"])
   parser.add_option_group(group)
 
   group = optparse.OptionGroup(parser, "Access the try server by HTTP")
   group.add_option("--use_http",
                    action="store_const",
                    const=_SendChangeHTTP,
                    dest="send_patch",
                    default=default_transport,
                    help="Use HTTP to talk to the try server [default]")
   group.add_option("--host",
@@ skipping 58 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)