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"""
fs.wrappers.xattr: FS wrapper for simulating extended-attribute support.
"""
try:
import cPickle as pickle
except ImportError:
import pickle
from fs.helpers import *
from fs.errors import *
from fs.wrappers import FSWrapper
class SimulateXAttr(FSWrapper):
"""FS wrapper class that simulates xattr support.
For each file in the underlying FS, this class managed a corresponding
'.xattr' file containing its extended attributes.
"""
def _get_attr_path(self, path):
"""Get the path of the file containing xattrs for the given path."""
if self.wrapped_fs.isdir(path):
attr_path = pathjoin(path, '.xattrs')
else:
dir_path, file_name = pathsplit(path)
attr_path = pathjoin(dir_path, '.xattrs.'+file_name)
return attr_path
def _is_attr_path(self, path):
"""Check whether the given path references an xattrs file."""
_,name = pathsplit(path)
if name.startswith(".xattrs"):
return True
return False
def _get_attr_dict(self, path):
"""Retrieve the xattr dictionary for the given path."""
attr_path = self._get_attr_path(path)
if self.wrapped_fs.exists(attr_path):
return pickle.loads(self.wrapped_fs.getcontents(attr_path))
else:
return {}
def _set_attr_dict(self, path, attrs):
"""Store the xattr dictionary for the given path."""
attr_path = self._get_attr_path(path)
self.wrapped_fs.setcontents(attr_path, pickle.dumps(attrs))
def setxattr(self, path, key, value):
"""Set an extended attribute on the given path."""
if not self.exists(path):
raise ResourceNotFoundError(path)
attrs = self._get_attr_dict(path)
attrs[key] = value
self._set_attr_dict(path, attrs)
def getxattr(self, path, key, default=None):
"""Retrieve an extended attribute for the given path."""
if not self.exists(path):
raise ResourceNotFoundError(path)
attrs = self._get_attr_dict(path)
return attrs.get(key, default)
def delxattr(self, path, key):
if not self.exists(path):
raise ResourceNotFoundError(path)
attrs = self._get_attr_dict(path)
try:
del attrs[key]
except KeyError:
pass
self._set_attr_dict(path, attrs)
def xattrs(self,path):
"""List all the extended attribute keys set on the given path."""
if not self.exists(path):
raise ResourceNotFoundError(path)
return self._get_attr_dict(path).keys()
def _encode(self,path):
"""Prevent requests for operations on .xattr files."""
if self._is_attr_path(path):
raise PathError(path,msg="Paths cannot contain '.xattrs': %(path)s")
return path
def _decode(self,path):
return path
def listdir(self,path="",**kwds):
"""Prevent .xattr from appearing in listings."""
entries = self.wrapped_fs.listdir(path,**kwds)
return [e for e in entries if not self._is_attr_path(e)]
def copy(self,src,dst,**kwds):
"""Ensure xattrs are copied when copying a file."""
self.wrapped_fs.copy(self._encode(src),self._encode(dst),**kwds)
s_attr_file = self._get_attr_path(src)
d_attr_file = self._get_attr_path(dst)
try:
self.wrapped_fs.copy(s_attr_file,d_attr_file,overwrite=True)
except ResourceNotFoundError,e:
pass
def move(self,src,dst,**kwds):
"""Ensure xattrs are preserved when moving a file."""
self.wrapped_fs.move(self._encode(src),self._encode(dst),**kwds)
s_attr_file = self._get_attr_path(src)
d_attr_file = self._get_attr_path(dst)
try:
self.wrapped_fs.move(s_attr_file,d_attr_file,overwrite=True)
except ResourceNotFoundError:
pass
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