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# 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
#
# 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.
import re
from oslo_concurrency import processutils
from oslo_config import cfg
from oslo_log import log as logging
from ironic.common import exception
from ironic.common.i18n import _
from ironic.common.i18n import _LW
from ironic.common import utils
from ironic.openstack.common import loopingcall
opts = [
cfg.IntOpt('check_device_interval',
default=1,
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'),
cfg.IntOpt('check_device_max_retries',
default=20,
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.'),
]
CONF = cfg.CONF
opt_group = cfg.OptGroup(name='disk_partitioner',
title='Options for the disk partitioner')
CONF.register_group(opt_group)
CONF.register_opts(opts, opt_group)
LOG = logging.getLogger(__name__)
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],
run_as_root=True)
def add_partition(self, size, part_type='primary', fs_type='',
bootable=False):
"""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 bootable: Boolean value; whether the partition is bootable
or not.
:returns: The partition number.
"""
self._partitions.append({'size': size,
'type': part_type,
'fs_type': fs_type,
'bootable': bootable})
return len(self._partitions)
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 = re.search(self._fuser_pids_re, out)
pids[0] = pids_match.group()
except processutils.ProcessExecutionError as exc:
LOG.warning(_LW('Failed to check the device %(device)s with fuser:'
' %(err)s'), {'device': self._device, 'err': exc})
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['bootable']:
cmd_args.extend(['set', str(num), 'boot', '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]})
_PARTED_PRINT_RE = re.compile(r"^(\d+):([\d\.]+)MiB:"
"([\d\.]+)MiB:([\d\.]+)MiB:(\w*)::(\w*)")
def list_partitions(device):
"""Get partitions information from given device.
:param device: The device path.
:returns: list of dictionaries (one per partition) with keys:
number, start, end, size (in MiB), filesystem, flags
"""
output = utils.execute(
'parted', '-s', '-m', device, 'unit', 'MiB', 'print',
use_standard_locale=True, run_as_root=True)[0]
if isinstance(output, bytes):
output = output.decode("utf-8")
lines = [line for line in output.split('\n') if line.strip()][2:]
# Example of line: 1:1.00MiB:501MiB:500MiB:ext4::boot
fields = ('number', 'start', 'end', 'size', 'filesystem', 'flags')
result = []
for line in lines:
match = _PARTED_PRINT_RE.match(line)
if match is None:
LOG.warn(_LW("Partition information from parted for device "
"%(device)s does not match "
"expected format: %(line)s"),
dict(device=device, line=line))
continue
# Cast int fields to ints (some are floats and we round them down)
groups = [int(float(x)) if i < 4 else x
for i, x in enumerate(match.groups())]
result.append(dict(zip(fields, groups)))
return result
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