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import os
import stat
import sys
from os.path import join, normcase, normpath, abspath, isabs, sep, dirname
from django.utils.encoding import force_text
from django.utils import six
try:
WindowsError = WindowsError
except NameError:
class WindowsError(Exception):
pass
if six.PY2:
fs_encoding = sys.getfilesystemencoding() or sys.getdefaultencoding()
# Under Python 2, define our own abspath function that can handle joining
# unicode paths to a current working directory that has non-ASCII characters
# in it. This isn't necessary on Windows since the Windows version of abspath
# handles this correctly. It also handles drive letters differently than the
# pure Python implementation, so it's best not to replace it.
if six.PY3 or os.name == 'nt':
abspathu = abspath
else:
def abspathu(path):
"""
Version of os.path.abspath that uses the unicode representation
of the current working directory, thus avoiding a UnicodeDecodeError
in join when the cwd has non-ASCII characters.
"""
if not isabs(path):
path = join(os.getcwdu(), path)
return normpath(path)
def upath(path):
"""
Always return a unicode path.
"""
if six.PY2 and not isinstance(path, six.text_type):
return path.decode(fs_encoding)
return path
def npath(path):
"""
Always return a native path, that is unicode on Python 3 and bytestring on
Python 2.
"""
if six.PY2 and not isinstance(path, bytes):
return path.encode(fs_encoding)
return path
def safe_join(base, *paths):
"""
Joins one or more path components to the base path component intelligently.
Returns a normalized, absolute version of the final path.
The final path must be located inside of the base path component (otherwise
a ValueError is raised).
"""
base = force_text(base)
paths = [force_text(p) for p in paths]
final_path = abspathu(join(base, *paths))
base_path = abspathu(base)
# Ensure final_path starts with base_path (using normcase to ensure we
# don't false-negative on case insensitive operating systems like Windows),
# further, one of the following conditions must be true:
# a) The next character is the path separator (to prevent conditions like
# safe_join("/dir", "/../d"))
# b) The final path must be the same as the base path.
# c) The base path must be the most root path (meaning either "/" or "C:\\")
if (not normcase(final_path).startswith(normcase(base_path + sep)) and
normcase(final_path) != normcase(base_path) and
dirname(normcase(base_path)) != normcase(base_path)):
raise ValueError('The joined path (%s) is located outside of the base '
'path component (%s)' % (final_path, base_path))
return final_path
def rmtree_errorhandler(func, path, exc_info):
"""
On Windows, some files are read-only (e.g. in in .svn dirs), so when
rmtree() tries to remove them, an exception is thrown.
We catch that here, remove the read-only attribute, and hopefully
continue without problems.
"""
exctype, value = exc_info[:2]
# looking for a windows error
if exctype is not WindowsError or 'Access is denied' not in str(value):
raise
# file type should currently be read only
if ((os.stat(path).st_mode & stat.S_IREAD) != stat.S_IREAD):
raise
# convert to read/write
os.chmod(path, stat.S_IWRITE)
# use the original function to repeat the operation
func(path)
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