/usr/share/pyshared/rtslib/node.py is in python-rtslib 2.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 | '''
Implements the base CFSNode class and a few inherited variants.
This file is part of RTSLib Community Edition.
Copyright (c) 2011 by RisingTide Systems LLC
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, version 3 (AGPLv3).
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
import os
import stat
from utils import fread, fwrite, RTSLibError, RTSLibNotInCFS
class CFSNode(object):
# Where do we store the fabric modules spec files ?
spec_dir = "/var/target/fabric"
# Where is the configfs base LIO directory ?
configfs_dir = '/sys/kernel/config/target'
# TODO: Make the ALUA path generic, not iscsi-centric
# What is the ALUA directory ?
alua_metadata_dir = "/var/target/alua/iSCSI"
# CFSNode private stuff
def __init__(self):
self._path = self.configfs_dir
def __nonzero__(self):
if os.path.isdir(self.path):
return True
else:
return False
def __str__(self):
return self.path
def _get_path(self):
return self._path
def _create_in_cfs_ine(self, mode):
'''
Creates the configFS node if it does not already exists depending on
the mode.
any -> makes sure it exists, also works if the node already does exists
lookup -> make sure it does NOT exists
create -> create the node which must not exists beforehand
Upon success (no exception raised), self._fresh is True if a node was
created, else self._fresh is False.
'''
if mode not in ['any', 'lookup', 'create']:
raise RTSLibError("Invalid mode: %s" % mode)
if self and mode == 'create':
raise RTSLibError("This %s already exists in configFS."
% self.__class__.__name__)
elif not self and mode == 'lookup':
raise RTSLibNotInCFS("No such %s in configfs: %s."
% (self.__class__.__name__, self.path))
if not self:
os.mkdir(self.path)
self._fresh = True
else:
self._fresh = False
def _exists(self):
return bool(self)
def _check_self(self):
if not self:
raise RTSLibNotInCFS("This %s does not exist in configFS."
% self.__class__.__name__)
def _is_fresh(self):
return self._fresh
def _list_files(self, path, writable=None):
'''
List files under a path depending on their owner's write permissions.
@param path: The path under which the files are expected to be. If the
path itself is not a directory, an empty list will be returned.
@type path: str
@param writable: If None (default), returns all parameters, if True,
returns read-write parameters, if False, returns just the read-only
parameters.
@type writable: bool or None
@return: List of file names filtered according to their write perms.
'''
if not os.path.isdir(path):
return []
if writable is None:
names = os.listdir(path)
elif writable:
names = [name for name in os.listdir(path)
if (os.stat("%s/%s" % (path, name))[stat.ST_MODE] \
& stat.S_IWUSR)]
else:
names = [os.path.basename(name) for name in os.listdir(path)
if not (os.stat("%s/%s" % (path, name))[stat.ST_MODE] \
& stat.S_IWUSR)]
names.sort()
return names
# CFSNode public stuff
def list_parameters(self, writable=None):
'''
@param writable: If None (default), returns all parameters, if True,
returns read-write parameters, if False, returns just the read-only
parameters.
@type writable: bool or None
@return: The list of existing RFC-3720 parameter names.
'''
self._check_self()
path = "%s/param" % self.path
return self._list_files(path, writable)
def list_attributes(self, writable=None):
'''
@param writable: If None (default), returns all attributes, if True,
returns read-write attributes, if False, returns just the read-only
attributes.
@type writable: bool or None
@return: A list of existing attribute names as strings.
'''
self._check_self()
path = "%s/attrib" % self.path
return self._list_files(path, writable)
def set_attribute(self, attribute, value):
'''
Sets the value of a named attribute.
The attribute must exist in configFS.
@param attribute: The attribute's name. It is case-sensitive.
@type attribute: string
@param value: The attribute's value.
@type value: string
'''
self._check_self()
path = "%s/attrib/%s" % (self.path, str(attribute))
if not os.path.isfile(path):
raise RTSLibError("Cannot find attribute: %s."
% str(attribute))
else:
try:
fwrite(path, "%s\n" % str(value))
except IOError, msg:
msg = msg[1]
raise RTSLibError("Cannot set attribute %s: %s"
% (str(attribute), str(msg)))
def get_attribute(self, attribute):
'''
@param attribute: The attribute's name. It is case-sensitive.
@return: The named attribute's value, as a string.
'''
self._check_self()
path = "%s/attrib/%s" % (self.path, str(attribute))
if not os.path.isfile(path):
raise RTSLibError("Cannot find attribute: %s."
% str(attribute))
else:
return fread(path).strip()
def set_parameter(self, parameter, value):
'''
Sets the value of a named RFC-3720 parameter.
The parameter must exist in configFS.
@param parameter: The RFC-3720 parameter's name. It is case-sensitive.
@type parameter: string
@param value: The parameter's value.
@type value: string
'''
self._check_self()
path = "%s/param/%s" % (self.path, str(parameter))
if not os.path.isfile(path):
raise RTSLibError("Cannot find parameter: %s."
% str(parameter))
else:
try:
fwrite(path, "%s \n" % str(value))
except IOError, msg:
msg = msg[1]
raise RTSLibError("Cannot set parameter %s: %s"
% (str(parameter), str(msg)))
def get_parameter(self, parameter):
'''
@param parameter: The RFC-3720 parameter's name. It is case-sensitive.
@type parameter: string
@return: The named parameter value as a string.
'''
self._check_self()
path = "%s/param/%s" % (self.path, str(parameter))
if not os.path.isfile(path):
raise RTSLibError("Cannot find RFC-3720 parameter: %s."
% str(parameter))
else:
return fread(path).rstrip()
def delete(self):
'''
If the underlying configFS object does not exists, this method does
nothing. If the underlying configFS object exists, this method attempts
to delete it.
'''
if self:
os.rmdir(self.path)
path = property(_get_path,
doc="Get the configFS object path.")
exists = property(_exists,
doc="Is True as long as the underlying configFS object exists. " \
+ "If the underlying configFS objects gets deleted " \
+ "either by calling the delete() method, or by any " \
+ "other means, it will be False.")
is_fresh = property(_is_fresh,
doc="Is True if the underlying configFS object has been created " \
+ "when instanciating this particular object. Is " \
+ "False if this object instanciation just looked " \
+ "up the underlying configFS object.")
def _test():
import doctest
doctest.testmod()
if __name__ == "__main__":
_test()
|