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