/usr/share/pyshared/fs/zipfs.py is in python-fs 0.3.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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fs.zipfs
========
A FS object that represents the contents of a Zip file
"""
from fs.base import *
from zipfile import ZipFile, ZIP_DEFLATED, ZIP_STORED
from memoryfs import MemoryFS
try:
from cStringIO import StringIO
except ImportError:
from StringIO import StringIO
import tempfs
class _TempWriteFile(object):
"""Proxies a file object and calls a callback when the file is closed."""
def __init__(self, fs, filename, close_callback):
self.fs = fs
self.filename = filename
self._file = self.fs.open(filename, 'w+')
self.close_callback = close_callback
def write(self, data):
return self._file.write(data)
def tell(self):
return self._file.tell()
def close(self):
self._file.close()
self.close_callback(self.filename)
class _ExceptionProxy(object):
"""A placeholder for an object that may no longer be used."""
def __getattr__(self, name):
raise ValueError("Zip file has been closed")
def __setattr__(self, name, value):
raise ValueError("Zip file has been closed")
def __nonzero__(self):
return False
class ZipFS(FS):
"""A FileSystem that represents a zip file."""
def __init__(self, zip_file, mode="r", compression="deflated", allow_zip_64=False, encoding="CP437", thread_synchronize=True):
"""Create a FS that maps on to a zip file.
:param zip_file: A (system) path, or a file-like object
:param mode: Mode to open zip file: 'r' for reading, 'w' for writing or 'a' for appending
:param compression: Can be 'deflated' (default) to compress data or 'stored' to just store date
:param allow_zip_64: -- Set to True to use zip files greater than 2 GB, default is False
:param encoding: -- The encoding to use for unicode filenames
:param thread_synchronize: -- Set to True (default) to enable thread-safety
"""
super(ZipFS, self).__init__(thread_synchronize=thread_synchronize)
if compression == "deflated":
compression_type = ZIP_DEFLATED
elif compression == "stored":
compression_type = ZIP_STORED
else:
raise ValueError("Compression should be 'deflated' (default) or 'stored'")
if len(mode) > 1 or mode not in "rwa":
raise ValueError("mode must be 'r', 'w' or 'a'")
self.zip_mode = mode
self.encoding = encoding
try:
self.zf = ZipFile(zip_file, mode, compression_type, allow_zip_64)
except IOError:
raise ResourceNotFoundError(str(zip_file), msg="Zip file does not exist: %(path)s")
self.zip_path = str(zip_file)
self.temp_fs = None
if mode in 'wa':
self.temp_fs = tempfs.TempFS()
self._path_fs = MemoryFS()
if mode in 'ra':
self._parse_resource_list()
def __str__(self):
return "<ZipFS: %s>" % self.zip_path
def __unicode__(self):
return unicode(self.__str__())
def _parse_resource_list(self):
for path in self.zf.namelist():
self._add_resource(path.decode(self.encoding))
def _add_resource(self, path):
if path.endswith('/'):
path = path[:-1]
if path:
self._path_fs.makedir(path, recursive=True, allow_recreate=True)
else:
dirpath, filename = pathsplit(path)
if dirpath:
self._path_fs.makedir(dirpath, recursive=True, allow_recreate=True)
f = self._path_fs.open(path, 'w')
f.close()
def close(self):
"""Finalizes the zip file so that it can be read.
No further operations will work after this method is called."""
if hasattr(self, 'zf') and self.zf:
self.zf.close()
self.zf = _ExceptionProxy()
@synchronize
def open(self, path, mode="r", **kwargs):
path = normpath(relpath(path))
if 'r' in mode:
if self.zip_mode not in 'ra':
raise OperationFailedError("open file", path=path, msg="Zip file must be opened for reading ('r') or appending ('a')")
try:
contents = self.zf.read(path.encode(self.encoding))
except KeyError:
raise ResourceNotFoundError(path)
return StringIO(contents)
if 'w' in mode:
dirname, filename = pathsplit(path)
if dirname:
self.temp_fs.makedir(dirname, recursive=True, allow_recreate=True)
self._add_resource(path)
f = _TempWriteFile(self.temp_fs, path, self._on_write_close)
return f
raise ValueError("Mode must contain be 'r' or 'w'")
@synchronize
def getcontents(self, path):
if not self.exists(path):
raise ResourceNotFoundError(path)
path = normpath(path)
try:
contents = self.zf.read(path.encode(self.encoding))
except KeyError:
raise ResourceNotFoundError(path)
except RuntimeError:
raise OperationFailedError("read file", path=path, msg="Zip file must be oppened with 'r' or 'a' to read")
return contents
@synchronize
def _on_write_close(self, filename):
sys_path = self.temp_fs.getsyspath(filename)
self.zf.write(sys_path, filename.encode(self.encoding))
def desc(self, path):
if self.isdir(path):
return "Dir in zip file: %s" % self.zip_path
else:
return "File in zip file: %s" % self.zip_path
def isdir(self, path):
return self._path_fs.isdir(path)
def isfile(self, path):
return self._path_fs.isfile(path)
def exists(self, path):
return self._path_fs.exists(path)
@synchronize
def makedir(self, dirname, recursive=False, allow_recreate=False):
dirname = normpath(dirname)
if self.zip_mode not in "wa":
raise OperationFailedError("create directory", path=dirname, msg="Zip file must be opened for writing ('w') or appending ('a')")
if not dirname.endswith('/'):
dirname += '/'
self._add_resource(dirname)
def listdir(self, path="/", wildcard=None, full=False, absolute=False, dirs_only=False, files_only=False):
return self._path_fs.listdir(path, wildcard, full, absolute, dirs_only, files_only)
@synchronize
def getinfo(self, path):
if not self.exists(path):
raise ResourceNotFoundError(path)
path = normpath(path).lstrip('/')
try:
zi = self.zf.getinfo(path.encode(self.encoding))
zinfo = dict((attrib, getattr(zi, attrib)) for attrib in dir(zi) if not attrib.startswith('_'))
for k, v in zinfo.iteritems():
if callable(v):
zinfo[k] = v()
except KeyError:
zinfo = {'file_size':0}
info = {'size' : zinfo['file_size'] }
if 'date_time' in zinfo:
info['created_time'] = datetime.datetime(*zinfo['date_time'])
info.update(zinfo)
return info
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