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"""
Extended attributes extend the basic attributes of files and directories
in the file system. They are stored as name:data pairs associated with
file system objects (files, directories, symlinks, etc).
The xattr type wraps a path or file descriptor with a dict-like interface
that exposes these extended attributes.
"""
__version__ = '0.7.5'
from .lib import (XATTR_NOFOLLOW, XATTR_CREATE, XATTR_REPLACE,
XATTR_NOSECURITY, XATTR_MAXNAMELEN, XATTR_FINDERINFO_NAME,
XATTR_RESOURCEFORK_NAME, _getxattr, _fgetxattr, _setxattr, _fsetxattr,
_removexattr, _fremovexattr, _listxattr, _flistxattr)
__all__ = [
"XATTR_NOFOLLOW", "XATTR_CREATE", "XATTR_REPLACE", "XATTR_NOSECURITY",
"XATTR_MAXNAMELEN", "XATTR_FINDERINFO_NAME", "XATTR_RESOURCEFORK_NAME",
"xattr", "listxattr", "getxattr", "setxattr", "removexattr"
]
class xattr(object):
"""
A wrapper for paths or file descriptors to access
their extended attributes with a dict-like interface
"""
def __init__(self, obj, options=0):
"""
obj should be a path, a file descriptor, or an
object that implements fileno() and returns a file
descriptor.
options should be 0 or XATTR_NOFOLLOW. If set, it will
be OR'ed with the options passed to getxattr, setxattr, etc.
"""
self.obj = obj
self.options = options
fileno = getattr(obj, 'fileno', None)
if fileno is not None:
self.value = fileno()
else:
self.value = obj
def __repr__(self):
if isinstance(self.value, int):
flavor = "fd"
else:
flavor = "file"
return "<%s %s=%r>" % (type(self).__name__, flavor, self.value)
def _call(self, name_func, fd_func, *args):
if isinstance(self.value, int):
return fd_func(self.value, *args)
else:
return name_func(self.value, *args)
def get(self, name, options=0):
"""
Retrieve the extended attribute ``name`` as a ``str``.
Raises ``IOError`` on failure.
See x-man-page://2/getxattr for options and possible errors.
"""
return self._call(_getxattr, _fgetxattr, name, 0, 0, options | self.options)
def set(self, name, value, options=0):
"""
Set the extended attribute ``name`` to ``value``
Raises ``IOError`` on failure.
See x-man-page://2/setxattr for options and possible errors.
"""
return self._call(_setxattr, _fsetxattr, name, value, 0, options | self.options)
def remove(self, name, options=0):
"""
Remove the extended attribute ``name``
Raises ``IOError`` on failure.
See x-man-page://2/removexattr for options and possible errors.
"""
return self._call(_removexattr, _fremovexattr, name, options | self.options)
self._remove(name, options | self.options)
def list(self, options=0):
"""
Retrieves the extended attributes currently set as a list
of strings. Raises ``IOError`` on failure.
See x-man-page://2/listxattr for options and possible errors.
"""
res = self._call(_listxattr, _flistxattr, options | self.options).split(b'\x00')
res.pop()
return [s.decode('utf-8') for s in res]
# dict-like methods
def __len__(self):
return len(self.list())
def __delitem__(self, item):
try:
self.remove(item)
except IOError:
raise KeyError(item)
def __setitem__(self, item, value):
self.set(item, value)
def __getitem__(self, item):
try:
return self.get(item)
except IOError:
raise KeyError(item)
def iterkeys(self):
return iter(self.list())
__iter__ = iterkeys
def has_key(self, item):
try:
self.get(item)
except IOError:
return False
else:
return True
__contains__ = has_key
def clear(self):
for k in self.keys():
del self[k]
def update(self, seq):
if not hasattr(seq, 'iteritems'):
seq = dict(seq)
for k, v in seq.iteritems():
self[k] = v
def copy(self):
return dict(self.iteritems())
def setdefault(self, k, d=''):
try:
d = self.get(k)
except IOError:
self[k] = d
return d
def keys(self):
return self.list()
def itervalues(self):
for k, v in self.iteritems():
yield v
def values(self):
return list(self.itervalues())
def iteritems(self):
for k in self.list():
yield k, self.get(k)
def items(self):
return list(self.iteritems())
def listxattr(f, symlink=False):
return tuple(xattr(f).list(options=symlink and XATTR_NOFOLLOW or 0))
def getxattr(f, attr, symlink=False):
return xattr(f).get(attr, options=symlink and XATTR_NOFOLLOW or 0)
def setxattr(f, attr, value, options=0, symlink=False):
if symlink:
options |= XATTR_NOFOLLOW
return xattr(f).set(attr, value, options=options)
def removexattr(f, attr, symlink=False):
options = symlink and XATTR_NOFOLLOW or 0
return xattr(f).remove(attr, options=options)
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