text: #!/usr/bin/env python
  # Copyright 2017 the V8 project authors. All rights reserved.
  # Use of this source code is governed by a BSD-style license that can be
  # found in the LICENSE file.
  
  # for py2/py3 compatibility
  from __future__ import print_function
  
  import os
  import pipes
  import shutil
  import stat
  import subprocess
  import sys
  
  DEPOT_TOOLS_URL = \
    "https://chromium.googlesource.com/chromium/tools/depot_tools.git"
  
  def EnsureDepotTools(v8_path, fetch_if_not_exist):
    def _Get(v8_path):
      depot_tools = os.path.join(v8_path, "_depot_tools")
      try:
        gclient_path = os.path.join(depot_tools, "gclient.py")
        if os.path.isfile(gclient_path):
          return depot_tools
      except:
        pass
      if fetch_if_not_exist:
        print("Checking out depot_tools.")
        # shell=True needed on Windows to resolve git.bat.
        subprocess.check_call("git clone {} {}".format(
            pipes.quote(DEPOT_TOOLS_URL),
            pipes.quote(depot_tools)), shell=True)
        # Using check_output to hide warning messages.
        subprocess.check_output(
            [sys.executable, gclient_path, "metrics", "--opt-out"],
            cwd=depot_tools)
        return depot_tools
      return None
    depot_tools = _Get(v8_path)
    assert depot_tools is not None
    print("Using depot tools in %s" % depot_tools)
    return depot_tools
  
  def UninitGit(v8_path):
    print("Uninitializing temporary git repository")
    target = os.path.join(v8_path, ".git")
    if os.path.isdir(target):
      print(">> Cleaning up %s" % target)
      def OnRmError(func, path, exec_info):
        # This might happen on Windows
        os.chmod(path, stat.S_IWRITE)
        os.unlink(path)
      shutil.rmtree(target, onerror=OnRmError)
  