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# Copyright (C) 2010 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.
"""Wrapper object for the file system / source tree."""
from __future__ import with_statement
import codecs
import errno
import exceptions
import os
import shutil
import tempfile
import time
class FileSystem(object):
"""FileSystem interface for webkitpy.
Unless otherwise noted, all paths are allowed to be either absolute
or relative."""
def exists(self, path):
"""Return whether the path exists in the filesystem."""
return os.path.exists(path)
def isfile(self, path):
"""Return whether the path refers to a file."""
return os.path.isfile(path)
def isdir(self, path):
"""Return whether the path refers to a directory."""
return os.path.isdir(path)
def join(self, *comps):
"""Return the path formed by joining the components."""
return os.path.join(*comps)
def listdir(self, path):
"""Return the contents of the directory pointed to by path."""
return os.listdir(path)
def mkdtemp(self, **kwargs):
"""Create and return a uniquely named directory.
This is like tempfile.mkdtemp, but if used in a with statement
the directory will self-delete at the end of the block (if the
directory is empty; non-empty directories raise errors). The
directory can be safely deleted inside the block as well, if so
desired."""
class TemporaryDirectory(object):
def __init__(self, **kwargs):
self._kwargs = kwargs
self._directory_path = None
def __enter__(self):
self._directory_path = tempfile.mkdtemp(**self._kwargs)
return self._directory_path
def __exit__(self, type, value, traceback):
# Only self-delete if necessary.
# FIXME: Should we delete non-empty directories?
if os.path.exists(self._directory_path):
os.rmdir(self._directory_path)
return TemporaryDirectory(**kwargs)
def maybe_make_directory(self, *path):
"""Create the specified directory if it doesn't already exist."""
try:
os.makedirs(os.path.join(*path))
except OSError, e:
if e.errno != errno.EEXIST:
raise
class _WindowsError(exceptions.OSError):
"""Fake exception for Linux and Mac."""
pass
def remove(self, path, osremove=os.remove):
"""On Windows, if a process was recently killed and it held on to a
file, the OS will hold on to the file for a short while. This makes
attempts to delete the file fail. To work around that, this method
will retry for a few seconds until Windows is done with the file."""
try:
exceptions.WindowsError
except AttributeError:
exceptions.WindowsError = FileSystem._WindowsError
retry_timeout_sec = 3.0
sleep_interval = 0.1
while True:
try:
osremove(path)
return True
except exceptions.WindowsError, e:
time.sleep(sleep_interval)
retry_timeout_sec -= sleep_interval
if retry_timeout_sec < 0:
raise e
def read_binary_file(self, path):
"""Return the contents of the file at the given path as a byte string."""
with file(path, 'rb') as f:
return f.read()
def read_text_file(self, path):
"""Return the contents of the file at the given path as a Unicode string.
The file is read assuming it is a UTF-8 encoded file with no BOM."""
with codecs.open(path, 'r', 'utf8') as f:
return f.read()
def write_binary_file(self, path, contents):
"""Write the contents to the file at the given location."""
with file(path, 'wb') as f:
f.write(contents)
def write_text_file(self, path, contents):
"""Write the contents to the file at the given location.
The file is written encoded as UTF-8 with no BOM."""
with codecs.open(path, 'w', 'utf8') as f:
f.write(contents)
def copyfile(self, source, destination):
"""Copies the contents of the file at the given path to the destination
path."""
shutil.copyfile(source, destination)
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