find_depot_tools.py

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#!/usr/bin/env python

# Copyright (c) 2011 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.

"""Small utility function to find depot_tools and add it to the python path.

Will throw an ImportError exception if depot_tools can't be found since it

imports breakpad.

This can also be used as a standalone script to print out the depot_tools

directory location.

"""

from __future__ import print_function

import os

import sys

# Path to //src

SRC = os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir))

def IsRealDepotTools(path):

  expanded_path = os.path.expanduser(path)

  return os.path.isfile(os.path.join(expanded_path, 'gclient.py'))

def add_depot_tools_to_path():

  """Search for depot_tools and add it to sys.path."""

  # First, check if we have a DEPS'd in "depot_tools".

  deps_depot_tools = os.path.join(SRC, 'third_party', 'depot_tools')

  if IsRealDepotTools(deps_depot_tools):

    # Put the pinned version at the start of the sys.path, in case there

    # are other non-pinned versions already on the sys.path.

    sys.path.insert(0, deps_depot_tools)

    return deps_depot_tools

  # Then look if depot_tools is already in PYTHONPATH.

  for i in sys.path:

    if i.rstrip(os.sep).endswith('depot_tools') and IsRealDepotTools(i):

      return i

  # Then look if depot_tools is in PATH, common case.

  for i in os.environ['PATH'].split(os.pathsep):

    if IsRealDepotTools(i):

      sys.path.append(i.rstrip(os.sep))

      return i

  # Rare case, it's not even in PATH, look upward up to root.

  root_dir = os.path.dirname(os.path.abspath(__file__))

  previous_dir = os.path.abspath(__file__)

  while root_dir and root_dir != previous_dir:

    i = os.path.join(root_dir, 'depot_tools')

    if IsRealDepotTools(i):

      sys.path.append(i)

      return i

    previous_dir = root_dir

    root_dir = os.path.dirname(root_dir)

  print('Failed to find depot_tools', file=sys.stderr)

  return None

DEPOT_TOOLS_PATH = add_depot_tools_to_path()

# pylint: disable=W0611

import breakpad

def main():

  if DEPOT_TOOLS_PATH is None:

    return 1

  print(DEPOT_TOOLS_PATH)

  return 0

if __name__ == '__main__':

  sys.exit(main())