Skip installation of UCRT

win_toolchain/get_toolchain_if_necessary.py

 #!/usr/bin/env python
 # Copyright 2013 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.
 
 """Downloads and unpacks a toolchain for building on Windows. The contents are
 matched by sha1 which will be updated when the toolchain is updated.
 
 Having a toolchain script in depot_tools means that it's not versioned
 directly with the source code. That is, if the toolchain is upgraded, but
@@ skipping 336 matching lines @@
     # Windows 8.1, Windows Server 2012 R2, and Windows 10.
     # The Windows 8.1 installer doesn't work on Windows 10, but it will never
     # be used because the UCRT is always installed on Windows 10.
     return 'Windows8.1-KB2999226-x64.msu'
   else:
     # Some future OS.
     return None
 
 
 def InstallUniversalCRTIfNeeded(abs_target_dir):
-  installer_name = GetInstallerName()
-  if not installer_name:
-    return
-
-  bitness = platform.architecture()[0]
-  # When running 64-bit python the x64 DLLs will be in System32
-  x64_path = 'System32' if bitness == '64bit' else 'Sysnative'
-  x64_path = os.path.join(r'C:\Windows', x64_path)
-  sample_crt_file = os.path.join(x64_path, 'ucrtbase.dll')
-
-  if os.path.exists(sample_crt_file):
-    # Nothing to do.
-    return
-
-  print ('%s does not exist - installing Windows 10 Universal C Runtime' %
-         sample_crt_file)
-
-  installer = os.path.join(abs_target_dir, "installers", installer_name)
-  command = r'wusa.exe /quiet "%s"' % installer
-  print 'Running %s' % command
-
-  try:
-    subprocess.check_call(command)
-  # Trap OSError instead of WindowsError so pylint will succeed on Linux.
-  except OSError as e:
-    if e.winerror == 740: # The requested operation requires elevation
-      print 'Elevation required. You can manually install this update:'
-      print '  %s' % installer
-      return
-    raise e
+  return
 
 
 def main():
   parser = optparse.OptionParser(description=sys.modules[__name__].__doc__)
   parser.add_option('--output-json', metavar='FILE',
                     help='write information about toolchain to FILE')
   parser.add_option('--force', action='store_true',
                     help='force script to run on non-Windows hosts')
   options, args = parser.parse_args()
 
@@ skipping 106 matching lines @@
   if os.environ.get('GYP_MSVS_VERSION') == '2015':
     InstallUniversalCRTIfNeeded(abs_toolchain_target_dir)
 
   RemoveUnusedToolchains(target_dir)
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())