# -*- coding: utf-8 -*-
#
# Copyright 2015 Red Hat, Inc.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from oslo_concurrency import processutils
from oslo_log import log
from oslo_utils import uuidutils
from ironic_python_agent import errors
from ironic_python_agent.extensions import base
from ironic_python_agent import hardware
from ironic_python_agent import utils
LOG = log.getLogger(__name__)
def _execute(cmd, error_msg, **kwargs):
try:
stdout, stderr = utils.execute(*cmd, **kwargs)
except processutils.ProcessExecutionError as e:
LOG.error(error_msg)
raise errors.ISCSIError(error_msg, e.exit_code, e.stdout, e.stderr)
def _wait_for_iscsi_daemon(attempts=10):
"""Wait for the ISCSI daemon to start."""
# here, iscsi daemon is considered not running in case
# tgtadm is not able to talk to tgtd to show iscsi targets
cmd = ['tgtadm', '--lld', 'iscsi', '--mode', 'target', '--op', 'show']
_execute(cmd, "ISCSI daemon didn't initialize", attempts=attempts)
def _start_iscsi_daemon(iqn, device):
"""Start a ISCSI target for the device."""
LOG.debug("Starting ISCSI target on device %{device}", {'device': device})
# Start ISCSI Target daemon
_execute(['tgtd'], "Unable to start the ISCSI daemon")
_wait_for_iscsi_daemon()
cmd = ['tgtadm', '--lld', 'iscsi', '--mode', 'target', '--op',
'new', '--tid', '1', '--targetname', iqn]
_execute(cmd, "Error when adding a new target for iqn %s" % iqn)
cmd = ['tgtadm', '--lld', 'iscsi', '--mode', 'logicalunit', '--op',
'new', '--tid', '1', '--lun', '1', '--backing-store', device]
_execute(cmd, "Error when adding a new logical unit for iqn %s" % iqn)
cmd = ['tgtadm', '--lld', 'iscsi', '--mode', 'target', '--op',
'bind', '--tid', '1', '--initiator-address', 'ALL']
_execute(cmd, "Error when enabling the target to accept the specific "
"initiators for iqn %s" % iqn)
[docs]class ISCSIExtension(base.BaseAgentExtension):
@base.sync_command('start_iscsi_target')
[docs] def start_iscsi_target(self, iqn=None):
"""Expose the disk as an ISCSI target."""
# If iqn is not given, generate one
if iqn is None:
iqn = 'iqn-' + uuidutils.generate_uuid()
device = hardware.dispatch_to_managers('get_os_install_device')
_start_iscsi_daemon(iqn, device)
return {"iscsi_target_iqn": iqn}