def _detect_eas(self, rp, write):
"""
Set extended attributes from rp. Tests writing if write is true.
"""
assert rp.conn is Globals.local_connection, (
"Action only foreseen locally and not over {conn}.".format(
conn=rp.conn))
assert rp.lstat(), "Path '{rp}' must exist to test EAs.".format(rp=rp)
if not Globals.eas_active:
log.Log(
"Extended attributes test skipped as rdiff-backup was "
"started with --no-eas option", log.INFO)
self.eas = None
return
try:
import xattr.pyxattr_compat as xattr
except ImportError:
try:
import xattr
except ImportError:
log.Log(
"Unable to import module (py)xattr. Extended attributes "
"not supported on filesystem at path {pa}".format(pa=rp),
log.INFO)
self.eas = False
return
test_ea = b"test val"
try:
xattr.list(rp.path)
if write:
xattr.set(rp.path, b"user.test", test_ea)
read_ea = xattr.get(rp.path, b"user.test")
except OSError as exc:
log.Log(
"Extended attributes not supported by filesystem at "
"path {pa} due to exception '{ex}'".format(pa=rp, ex=exc),
log.NOTE)
self.eas = False
else:
if write and read_ea != test_ea:
log.Log(
"Extended attributes support is broken on filesystem at "
"path {pa}. Please upgrade the filesystem driver, contact "
"the developers, or use the --no-eas option to disable "
"extended attributes support and suppress this "
"message".format(pa=rp), log.WARNING)
self.eas = False
else:
self.eas = True
def read_from_rp(self, rp):
"""Set the extended attributes from an rpath"""
try:
attr_list = xattr.list(rp.path, rp.issym())
except OSError as exc:
if exc.errno in (errno.EOPNOTSUPP, errno.EPERM, errno.ETXTBSY):
return # if not supported, consider empty
if exc.errno in (errno.EACCES, errno.ENOENT, errno.ELOOP):
log.Log(
"Listing extended attributes of path {pa} produced "
"exception '{ex}', ignored".format(pa=rp, ex=exc),
log.INFO)
return
raise
for attr in attr_list:
if attr.startswith(b'system.'):
# Do not preserve system extended attributes
continue
if not rp.isdir() and attr == b'com.apple.ResourceFork':
# Resource Fork handled elsewhere, except for directories
continue
try:
self.attr_dict[attr] = xattr.get(rp.path, attr, rp.issym())
except OSError as exc:
# File probably modified while reading, just continue
if exc.errno == errno.ENODATA:
continue
elif exc.errno == errno.ENOENT:
break
# Handle bug in pyxattr < 0.2.2
elif exc.errno == errno.ERANGE:
continue
else:
raise
def _clear_rp(self, rp):
"""Delete all the extended attributes in rpath"""
try:
for name in xattr.list(rp.path, rp.issym()):
try:
xattr.remove(rp.path, name, rp.issym())
except PermissionError: # errno.EACCES
# SELinux attributes cannot be removed, and we don't want
# to bail out or be too noisy at low log levels.
log.Log(
"Not allowed to remove extended attribute "
"{ea} from path {pa}".format(ea=name, pa=rp),
log.DEBUG)
continue
except OSError as exc:
# can happen because trusted.SGI_ACL_FILE is deleted
# together with system.posix_acl_access on XFS file systems.
if exc.errno == errno.ENODATA:
continue
else: # can be anything, just fail
raise
except io.UnsupportedOperation: # errno.EOPNOTSUPP or errno.EPERM
return # if not supported, consider empty
except FileNotFoundError as exc:
log.Log(
"Unable to clear extended attributes on path {pa} due to "
"exception '{ex}', ignoring".format(pa=rp, ex=exc), log.NOTE)
return
def _detect_eas(self, rp, write):
"""Set extended attributes from rp. Tests writing if write is true."""
assert rp.conn is Globals.local_connection, (
"Action only foreseen locally and not over {conn}.".format(
conn=rp.conn))
assert rp.lstat(), "Path '{rp!s}' must exist to test EAs.".format(
rp=rp)
if Globals.eas_active == 0:
log.Log(
"Extended attributes test skipped. rdiff-backup run "
"with --no-eas option.", 4)
self.eas = 0
return
try:
import xattr.pyxattr_compat as xattr
except ImportError:
try:
import xattr
except ImportError:
log.Log(
"Unable to import module (py)xattr.\nExtended attributes not "
"supported on filesystem at %s" % (rp.get_safepath(), ), 4)
self.eas = 0
return
test_ea = b"test val"
try:
xattr.list(rp.path)
if write:
xattr.set(rp.path, b"user.test", test_ea)
read_ea = xattr.get(rp.path, b"user.test")
except IOError:
log.Log(
"Extended attributes not supported by "
"filesystem at %s" % (rp.get_safepath(), ), 4)
self.eas = 0
else:
if write and read_ea != test_ea:
log.Log(
"Extended attributes support is broken on filesystem at "
"%s.\nPlease upgrade the filesystem driver, contact the "
"developers,\nor use the --no-eas option to disable "
"extended attributes\nsupport and suppress this message." %
(rp.get_safepath(), ), 1)
self.eas = 0
else:
self.eas = 1
def set_eas(self, rp, write):
"""Set extended attributes from rp. Tests writing if write is true."""
assert Globals.local_connection is rp.conn
assert rp.lstat()
if Globals.eas_active == 0:
log.Log(
"Extended attributes test skipped. rdiff-backup run "
"with --no-eas option.", 4)
self.eas = 0
return
try:
import xattr.pyxattr_compat as xattr
except ImportError:
try:
import xattr
except ImportError:
log.Log(
"Unable to import module (py)xattr.\nExtended attributes not "
"supported on filesystem at %s" % (rp.get_safepath(), ), 4)
self.eas = 0
return
try:
xattr.list(rp.path)
if write:
xattr.set(rp.path, b"user.test", b"test val")
assert xattr.get(rp.path, b"user.test") == b"test val"
except IOError:
log.Log(
"Extended attributes not supported by "
"filesystem at %s" % (rp.get_safepath(), ), 4)
self.eas = 0
except AssertionError:
log.Log(
"Extended attributes support is broken on filesystem at "
"%s.\nPlease upgrade the filesystem driver, contact the "
"developers,\nor use the --no-eas option to disable "
"extended attributes\nsupport and suppress this message." %
(rp.get_safepath(), ), 1)
self.eas = 0
else:
self.eas = 1