Source code for ironic_lib.disk_partitioner

# Copyright 2014 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
#    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.

import re

from oslo_concurrency import processutils
from oslo_config import cfg
from oslo_log import log as logging
from oslo_service import loopingcall

from ironic_lib.common.i18n import _
from ironic_lib.common.i18n import _LW
from ironic_lib import exception
from ironic_lib import utils

opts = [
               help='After Ironic has completed creating the partition table, '
                    'it continues to check for activity on the attached iSCSI '
                    'device status at this interval prior to copying the image'
                    ' to the node, in seconds'),
               help='The maximum number of times to check that the device is '
                    'not accessed by another process. If the device is still '
                    'busy after that, the disk partitioning will be treated as'
                    ' having failed.')

opt_group = cfg.OptGroup(name='disk_partitioner',
                         title='Options for the disk partitioner')
CONF.register_opts(opts, opt_group)

LOG = logging.getLogger(__name__)

[docs]class DiskPartitioner(object): def __init__(self, device, disk_label='msdos', alignment='optimal'): """A convenient wrapper around the parted tool. :param device: The device path. :param disk_label: The type of the partition table. Valid types are: "bsd", "dvh", "gpt", "loop", "mac", "msdos", "pc98", or "sun". :param alignment: Set alignment for newly created partitions. Valid types are: none, cylinder, minimal and optimal. """ self._device = device self._disk_label = disk_label self._alignment = alignment self._partitions = [] self._fuser_pids_re = re.compile(r'((\d)+\s*)+') def _exec(self, *args): # NOTE(lucasagomes): utils.execute() is already a wrapper on top # of processutils.execute() which raises specific # exceptions. It also logs any failure so we don't # need to log it again here. utils.execute('parted', '-a', self._alignment, '-s', self._device, '--', 'unit', 'MiB', *args, check_exit_code=[0], use_standard_locale=True, run_as_root=True)
[docs] def add_partition(self, size, part_type='primary', fs_type='', boot_flag=None): """Add a partition. :param size: The size of the partition in MiB. :param part_type: The type of the partition. Valid values are: primary, logical, or extended. :param fs_type: The filesystem type. Valid types are: ext2, fat32, fat16, HFS, linux-swap, NTFS, reiserfs, ufs. If blank (''), it will create a Linux native partition (83). :param boot_flag: Boot flag that needs to be configured on the partition. Ignored if None. It can take values 'bios_grub', 'boot'. :returns: The partition number. """ self._partitions.append({'size': size, 'type': part_type, 'fs_type': fs_type, 'boot_flag': boot_flag}) return len(self._partitions)
[docs] def get_partitions(self): """Get the partitioning layout. :returns: An iterator with the partition number and the partition layout. """ return enumerate(self._partitions, 1)
def _wait_for_disk_to_become_available(self, retries, max_retries, pids, stderr): retries[0] += 1 if retries[0] > max_retries: raise loopingcall.LoopingCallDone() try: # NOTE(ifarkas): fuser returns a non-zero return code if none of # the specified files is accessed out, err = utils.execute('fuser', self._device, check_exit_code=[0, 1], run_as_root=True) if not out and not err: raise loopingcall.LoopingCallDone() else: if err: stderr[0] = err if out: pids_match =, out) pids[0] = except processutils.ProcessExecutionError as exc: LOG.warning(_LW('Failed to check the device %(device)s with fuser:' ' %(err)s'), {'device': self._device, 'err': exc})
[docs] def commit(self): """Write to the disk.""" LOG.debug("Committing partitions to disk.") cmd_args = ['mklabel', self._disk_label] # NOTE(lucasagomes): Lead in with 1MiB to allow room for the # partition table itself. start = 1 for num, part in self.get_partitions(): end = start + part['size'] cmd_args.extend(['mkpart', part['type'], part['fs_type'], str(start), str(end)]) if part['boot_flag']: cmd_args.extend(['set', str(num), part['boot_flag'], 'on']) start = end self._exec(*cmd_args) retries = [0] pids = [''] fuser_err = [''] interval = CONF.disk_partitioner.check_device_interval max_retries = CONF.disk_partitioner.check_device_max_retries timer = loopingcall.FixedIntervalLoopingCall( self._wait_for_disk_to_become_available, retries, max_retries, pids, fuser_err) timer.start(interval=interval).wait() if retries[0] > max_retries: if pids[0]: raise exception.InstanceDeployFailure( _('Disk partitioning failed on device %(device)s. ' 'Processes with the following PIDs are holding it: ' '%(pids)s. Time out waiting for completion.') % {'device': self._device, 'pids': pids[0]}) else: raise exception.InstanceDeployFailure( _('Disk partitioning failed on device %(device)s. Fuser ' 'exited with "%(fuser_err)s". Time out waiting for ' 'completion.') % {'device': self._device, 'fuser_err': fuser_err[0]})
[docs]def list_opts(): """Entry point for oslo-config-generator.""" return [('disk_partitioner', opts)]

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