Make bot_update.py print git version it uses.

recipe_modules/bot_update/resources/bot_update.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 # TODO(hinoka): Use logging.
 
 import cStringIO
 import codecs
 import copy
@@ skipping 923 matching lines @@
   first_sln = dir_names[0]
 
   # Split all the revision specifications into a nice dict.
   print 'Revisions: %s' % options.revision
   revisions = parse_revisions(options.revision, first_sln)
   print 'Fetching Git checkout at %s@%s' % (first_sln, revisions[first_sln])
   return revisions, step_text, shallow
 
 
 def checkout(options, git_slns, specs, revisions, step_text, shallow):
+  print 'Checking git version...'
+  ver = git('version').strip()
+  print 'Using %s' % ver
+
   first_sln = git_slns[0]['name']
   dir_names = [sln.get('name') for sln in git_slns if 'name' in sln]
   try:
     # Outer try is for catching patch failures and exiting gracefully.
     # Inner try is for catching gclient failures and retrying gracefully.
     try:
       checkout_parameters = dict(
           # First, pass in the base of what we want to check out.
           solutions=git_slns,
           revisions=revisions,
@@ skipping 122 matching lines @@
     # download patch failure is still an infra problem.
     if e.code == 3:
       # Patch download problem.
       return 87
     # Genuine patch problem.
     return 88
 
 
 if __name__ == '__main__':
   sys.exit(main())