352 lines
12 KiB
Python
352 lines
12 KiB
Python
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# disklabel.py
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# Device format classes for anaconda's storage configuration module.
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#
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# Copyright (C) 2009 Red Hat, Inc.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions of
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# the GNU General Public License v.2, or (at your option) any later version.
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY expressed or implied, including the implied warranties of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details. You should have received a copy of the
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# GNU General Public License along with this program; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA. Any Red Hat trademarks that are incorporated in the
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# source code or documentation are not subject to the GNU General Public
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# License and may only be used or replicated with the express permission of
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# Red Hat, Inc.
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#
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# Red Hat Author(s): Dave Lehman <dlehman@redhat.com>
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#
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import os
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import copy
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from ..storage_log import log_method_call
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import parted
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import _ped
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import platform
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from ..errors import *
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from ..udev import udev_settle
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from . import DeviceFormat, register_device_format
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import gettext
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_ = lambda x: gettext.ldgettext("anaconda", x)
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import logging
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log = logging.getLogger("storage")
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class DiskLabel(DeviceFormat):
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""" Disklabel """
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_type = "disklabel"
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_name = "partition table"
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_formattable = True # can be formatted
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_supported = False # is supported
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def __init__(self, *args, **kwargs):
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""" Create a DiskLabel instance.
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Keyword Arguments:
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device -- path to the underlying device
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exists -- indicates whether this is an existing format
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"""
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log_method_call(self, *args, **kwargs)
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DeviceFormat.__init__(self, *args, **kwargs)
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self._size = None
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self._partedDevice = None
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self._partedDisk = None
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self._origPartedDisk = None
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self._alignment = None
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self._endAlignment = None
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if self.partedDevice:
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# set up the parted objects and raise exception on failure
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self._origPartedDisk = self.partedDisk.duplicate()
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def __deepcopy__(self, memo):
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""" Create a deep copy of a Disklabel instance.
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We can't do copy.deepcopy on parted objects, which is okay.
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For these parted objects, we just do a shallow copy.
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"""
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new = self.__class__.__new__(self.__class__)
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memo[id(self)] = new
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shallow_copy_attrs = ('_partedDevice', '_partedDisk', '_origPartedDisk')
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for (attr, value) in self.__dict__.items():
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if attr in shallow_copy_attrs:
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setattr(new, attr, copy.copy(value))
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else:
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setattr(new, attr, copy.deepcopy(value, memo))
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return new
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def __str__(self):
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s = DeviceFormat.__str__(self)
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s += (" type = %(type)s partition count = %(count)s"
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" sectorSize = %(sectorSize)s\n"
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" align_offset = %(offset)s align_grain = %(grain)s\n"
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" partedDisk = %(disk)r\n"
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" origPartedDisk = %(orig_disk)r\n"
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" partedDevice = %(dev)r\n" %
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{"type": self.labelType, "count": len(self.partitions),
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"sectorSize": self.partedDevice.sectorSize,
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"offset": self.alignment.offset,
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"grain": self.alignment.grainSize,
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"disk": self.partedDisk, "orig_disk": self._origPartedDisk,
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"dev": self.partedDevice})
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return s
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@property
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def dict(self):
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d = super(DiskLabel, self).dict
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d.update({"labelType": self.labelType,
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"partitionCount": len(self.partitions),
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"sectorSize": self.partedDevice.sectorSize,
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"offset": self.alignment.offset,
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"grainSize": self.alignment.grainSize})
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return d
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def resetPartedDisk(self):
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""" Set this instance's partedDisk to reflect the disk's contents. """
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log_method_call(self, device=self.device)
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self._partedDisk = self._origPartedDisk
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def freshPartedDisk(self):
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""" Return a new, empty parted.Disk instance for this device. """
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log_method_call(self, device=self.device)
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platf = platform.getPlatform(None)
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labelType = platf.diskLabelType(self.partedDevice.type)
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return parted.freshDisk(device=self.partedDevice, ty=labelType)
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@property
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def partedDisk(self):
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if not self._partedDisk:
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if self.exists:
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try:
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self._partedDisk = parted.Disk(device=self.partedDevice)
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except (_ped.DiskLabelException, _ped.IOException,
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NotImplementedError) as e:
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raise InvalidDiskLabelError()
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if self._partedDisk.type == "loop":
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# When the device has no partition table but it has a FS,
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# it will be created with label type loop. Treat the
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# same as if the device had no label (cause it really
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# doesn't).
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raise InvalidDiskLabelError()
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else:
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self._partedDisk = self.freshPartedDisk()
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return self._partedDisk
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@property
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def partedDevice(self):
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if not self._partedDevice and self.device and \
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os.path.exists(self.device):
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# We aren't guaranteed to be able to get a device. In
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# particular, built-in USB flash readers show up as devices but
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# do not always have any media present, so parted won't be able
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# to find a device.
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try:
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self._partedDevice = parted.Device(path=self.device)
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except (_ped.IOException, _ped.DeviceException):
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pass
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return self._partedDevice
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@property
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def labelType(self):
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""" The disklabel type (eg: 'gpt', 'msdos') """
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return self.partedDisk.type
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@property
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def name(self):
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return "%s (%s)" % (self._name, self.labelType.upper())
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@property
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def size(self):
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size = self._size
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if not size:
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try:
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size = self.partedDevice.getSize(unit="MB")
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except Exception:
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size = 0
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return size
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@property
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def status(self):
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""" Device status. """
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return False
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def setup(self, *args, **kwargs):
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""" Open, or set up, a device. """
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log_method_call(self, device=self.device,
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type=self.type, status=self.status)
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if not self.exists:
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raise DeviceFormatError("format has not been created")
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if self.status:
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return
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DeviceFormat.setup(self, *args, **kwargs)
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def teardown(self, *args, **kwargs):
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""" Close, or tear down, a device. """
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log_method_call(self, device=self.device,
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type=self.type, status=self.status)
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if not self.exists:
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raise DeviceFormatError("format has not been created")
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def create(self, *args, **kwargs):
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""" Create the device. """
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log_method_call(self, device=self.device,
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type=self.type, status=self.status)
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if self.exists:
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raise DeviceFormatError("format already exists")
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if self.status:
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raise DeviceFormatError("device exists and is active")
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DeviceFormat.create(self, *args, **kwargs)
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self.commit()
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self.exists = True
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def destroy(self, *args, **kwargs):
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""" Wipe the disklabel from the device. """
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log_method_call(self, device=self.device,
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type=self.type, status=self.status)
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if not self.exists:
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raise DeviceFormatError("format does not exist")
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if not os.access(self.device, os.W_OK):
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raise DeviceFormatError("device path does not exist")
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self._partedDisk = parted.freshDisk(device=self.partedDevice,
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ty=self.partedDisk.type)
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self.commit()
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self.partedDevice.clobber()
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self.commit()
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self.exists = False
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def commit(self):
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""" Commit the current partition table to disk and notify the OS. """
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log_method_call(self, device=self.device,
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numparts=len(self.partitions))
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try:
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self.partedDisk.commit()
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except parted.DiskException as msg:
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raise DiskLabelCommitError(msg)
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else:
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udev_settle()
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def commitToDisk(self):
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""" Commit the current partition table to disk. """
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log_method_call(self, device=self.device,
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numparts=len(self.partitions))
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try:
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self.partedDisk.commitToDevice()
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except parted.DiskException as msg:
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raise DiskLabelCommitError(msg)
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def addPartition(self, *args, **kwargs):
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partition = kwargs.get("partition", None)
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if not partition:
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partition = args[0]
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geometry = partition.geometry
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constraint = kwargs.get("constraint", None)
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if not constraint and len(args) > 1:
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constraint = args[1]
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elif not constraint:
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constraint = parted.Constraint(exactGeom=geometry)
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new_partition = parted.Partition(disk=self.partedDisk,
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type=partition.type,
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geometry=geometry)
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self.partedDisk.addPartition(partition=new_partition,
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constraint=constraint)
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def removePartition(self, partition):
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self.partedDisk.removePartition(partition)
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@property
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def extendedPartition(self):
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try:
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extended = self.partedDisk.getExtendedPartition()
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except Exception:
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extended = None
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return extended
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@property
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def logicalPartitions(self):
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try:
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logicals = self.partedDisk.getLogicalPartitions()
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except Exception:
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logicals = []
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return logicals
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@property
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def firstPartition(self):
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try:
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part = self.partedDisk.getFirstPartition()
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except Exception:
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part = None
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return part
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@property
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def partitions(self):
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try:
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parts = self.partedDisk.partitions
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except Exception:
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parts = []
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return parts
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@property
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def alignment(self):
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""" Alignment requirements for this device. """
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if not self._alignment:
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try:
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disklabel_alignment = self.partedDisk.partitionAlignment
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except _ped.CreateException:
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disklabel_alignment = parted.Alignment(offset=0, grainSize=1)
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try:
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optimum_device_alignment = self.partedDevice.optimumAlignment
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except _ped.CreateException:
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optimum_device_alignment = None
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try:
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minimum_device_alignment = self.partedDevice.minimumAlignment
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except _ped.CreateException:
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minimum_device_alignment = None
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try:
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a = optimum_device_alignment.intersect(disklabel_alignment)
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except (ArithmeticError, AttributeError):
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try:
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a = minimum_device_alignment.intersect(disklabel_alignment)
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except (ArithmeticError, AttributeError):
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a = disklabel_alignment
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self._alignment = a
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return self._alignment
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@property
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def endAlignment(self):
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if not self._endAlignment:
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self._endAlignment = parted.Alignment(
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offset = self.alignment.offset - 1,
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grainSize = self.alignment.grainSize)
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return self._endAlignment
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register_device_format(DiskLabel)
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