85 lines
2.8 KiB
Python
85 lines
2.8 KiB
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.
|
||
|
|
|
||
|
|
"""Some utility methods for getting and manipulating paths."""
|
||
|
|
|
||
|
|
# TODO(pamg): Have the buildbot use these, too.
|
||
|
|
|
||
|
|
|
||
|
|
import errno
|
||
|
|
import os
|
||
|
|
import sys
|
||
|
|
|
||
|
|
class PathNotFound(Exception): pass
|
||
|
|
|
||
|
|
def ScriptDir():
|
||
|
|
"""Get the full path to the directory containing the current script."""
|
||
|
|
script_filename = os.path.abspath(sys.argv[0])
|
||
|
|
return os.path.dirname(script_filename)
|
||
|
|
|
||
|
|
def FindAncestor(start_dir, ancestor):
|
||
|
|
"""Finds an ancestor dir in a path.
|
||
|
|
|
||
|
|
For example, FindAncestor('c:\foo\bar\baz', 'bar') would return
|
||
|
|
'c:\foo\bar'. Unlike FindUpward*, this only looks at direct path ancestors.
|
||
|
|
"""
|
||
|
|
start_dir = os.path.abspath(start_dir)
|
||
|
|
path = start_dir
|
||
|
|
while True:
|
||
|
|
(parent, tail) = os.path.split(path)
|
||
|
|
if tail == ancestor:
|
||
|
|
return path
|
||
|
|
if not tail:
|
||
|
|
break
|
||
|
|
path = parent
|
||
|
|
raise PathNotFound("Unable to find ancestor %s in %s" % (ancestor, start_dir))
|
||
|
|
|
||
|
|
def FindUpwardParent(start_dir, *desired_list):
|
||
|
|
"""Finds the desired object's parent, searching upward from the start_dir.
|
||
|
|
|
||
|
|
Searches start_dir and all its parents looking for the desired directory
|
||
|
|
or file, which may be given in one or more path components. Returns the
|
||
|
|
first directory in which the top desired path component was found, or raises
|
||
|
|
PathNotFound if it wasn't.
|
||
|
|
"""
|
||
|
|
desired_path = os.path.join(*desired_list)
|
||
|
|
last_dir = ''
|
||
|
|
cur_dir = start_dir
|
||
|
|
found_path = os.path.join(cur_dir, desired_path)
|
||
|
|
while not os.path.exists(found_path):
|
||
|
|
last_dir = cur_dir
|
||
|
|
cur_dir = os.path.dirname(cur_dir)
|
||
|
|
if last_dir == cur_dir:
|
||
|
|
raise PathNotFound('Unable to find %s above %s' %
|
||
|
|
(desired_path, start_dir))
|
||
|
|
found_path = os.path.join(cur_dir, desired_path)
|
||
|
|
# Strip the entire original desired path from the end of the one found
|
||
|
|
# and remove a trailing path separator, if present.
|
||
|
|
found_path = found_path[:len(found_path) - len(desired_path)]
|
||
|
|
if found_path.endswith(os.sep):
|
||
|
|
found_path = found_path[:len(found_path) - 1]
|
||
|
|
return found_path
|
||
|
|
|
||
|
|
|
||
|
|
def FindUpward(start_dir, *desired_list):
|
||
|
|
"""Returns a path to the desired directory or file, searching upward.
|
||
|
|
|
||
|
|
Searches start_dir and all its parents looking for the desired directory
|
||
|
|
or file, which may be given in one or more path components. Returns the full
|
||
|
|
path to the desired object, or raises PathNotFound if it wasn't found.
|
||
|
|
"""
|
||
|
|
parent = FindUpwardParent(start_dir, *desired_list)
|
||
|
|
return os.path.join(parent, *desired_list)
|
||
|
|
|
||
|
|
|
||
|
|
def MaybeMakeDirectory(*path):
|
||
|
|
"""Creates an entire path, if it doesn't already exist."""
|
||
|
|
file_path = os.path.join(*path)
|
||
|
|
try:
|
||
|
|
os.makedirs(file_path)
|
||
|
|
except OSError, e:
|
||
|
|
# errno.EEXIST is "File exists". If we see another error, re-raise.
|
||
|
|
if e.errno != errno.EEXIST:
|
||
|
|
raise
|