Causing gyp_chromium to fall back on win32 hermetic python if it is...

build/gyp_chromium

 #!/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.
 
 # This script is wrapper for Chromium that adds some support for how GYP
 # is invoked by Chromium beyond what can be done in the gclient hooks.
 
 import glob
 import os
 import shlex
+import subprocess
 import sys
 
 script_dir = os.path.dirname(__file__)
 chrome_src = os.path.normpath(os.path.join(script_dir, os.pardir))
 
 sys.path.insert(0, os.path.join(chrome_src, 'tools', 'gyp', 'pylib'))
 import gyp
 
 def apply_gyp_environment(file_path=None):
   """
@@ skipping 48 matching lines @@
   # Optionally add supplemental .gypi files if present.
   supplements = glob.glob(os.path.join(chrome_src, '*', 'supplement.gypi'))
   for supplement in supplements:
     AddInclude(supplement)
 
   return result
 
 if __name__ == '__main__':
   args = sys.argv[1:]
 
+  # Fall back on hermetic python if we happen to get run under cygwin.
+  # TODO(bradnelson): take this out once this issue is fixed:
+  #    http://code.google.com/p/gyp/issues/detail?id=177
+  if sys.platform == 'cygwin':
+    python_dir = os.path.join(chrome_src, 'third_party', 'python_26')
+    env = os.environ.copy()
+    env['PATH'] = python_dir + os.pathsep + env.get('PATH', '')
+    p = subprocess.Popen(
+       [os.path.join(python_dir, 'python.exe')] + sys.argv,
+       env=env, shell=False)
+    p.communicate()
+    sys.exit(p.returncode)
+
   if 'SKIP_CHROMIUM_GYP_ENV' not in os.environ:
     # Update the environment based on chromium.gyp_env
     gyp_env_path = os.path.join(os.path.dirname(chrome_src), 'chromium.gyp_env')
     apply_gyp_environment(gyp_env_path)
 
   # This could give false positives since it doesn't actually do real option
   # parsing.  Oh well.
   gyp_file_specified = False
   for arg in args:
     if arg.endswith('.gyp'):
@@ skipping 29 matching lines @@
   # to enfore syntax checking.
   syntax_check = os.environ.get('CHROMIUM_GYP_SYNTAX_CHECK')
   if syntax_check and int(syntax_check):
     args.append('--check')
 
   print 'Updating projects from gyp files...'
   sys.stdout.flush()
 
   # Off we go...
   sys.exit(gyp.main(args))