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# Copyright 2015 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import errno
import os.path
import sys
def _GetDirAbove(dirname):
"""Returns the directory "above" this file containing |dirname| (which must
also be "above" this file)."""
path = os.path.abspath(__file__)
while True:
path, tail = os.path.split(path)
if not tail:
return None
if tail == dirname:
return path
def EnsureDirectoryExists(path, always_try_to_create=False):
"""A wrapper for os.makedirs that does not error if the directory already
exists. A different process could be racing to create this directory."""
if not os.path.exists(path) or always_try_to_create:
try:
os.makedirs(path)
except OSError as e:
# There may have been a race to create this directory.
if e.errno != errno.EEXIST:
raise
def AddLocalRepoThirdPartyDirToModulePath():
"""Helper function to find the top-level directory of this script's repository
assuming the script falls somewhere within a 'mojo' directory, and insert the
top-level 'third_party' directory early in the module search path. Used to
ensure that third-party dependencies provided within the repository itself
(e.g. Chromium sources include snapshots of jinja2 and ply) are preferred over
locally installed system library packages."""
toplevel_dir = _GetDirAbove('mojo')
if toplevel_dir:
sys.path.insert(1, os.path.join(toplevel_dir, 'third_party'))
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