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# Copyright 2008, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""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
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