import os import stat from os.path import join, normcase, normpath, abspath, isabs, sep from django.utils.encoding import force_unicode try: WindowsError = WindowsError except NameError: class WindowsError(Exception): pass # 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. The Windows # abspath also handles drive letters differently than the pure # Python implementation, so it's best not to replace it. if 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 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_unicode(base) paths = [force_unicode(p) for p in paths] final_path = abspathu(join(base, *paths)) base_path = abspathu(base) base_path_len = len(base_path) # Ensure final_path starts with base_path (using normcase to ensure we # don't false-negative on case insensitive operating systems like Windows) # and that the next character after the final path is os.sep (or nothing, # in which case final_path must be equal to base_path). if not normcase(final_path).startswith(normcase(base_path)) \ or final_path[base_path_len:base_path_len+1] not in ('', sep): 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)