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partitioning.py
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partitioning.py
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# partitioning.py
# Disk partitioning functions.
#
# Copyright (C) 2009, 2010, 2011, 2012, 2013 Red Hat, Inc.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# the GNU General Public License v.2, or (at your option) any later version.
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY expressed or implied, including the implied warranties of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details. You should have received a copy of the
# GNU General Public License along with this program; if not, write to the
# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA. Any Red Hat trademarks that are incorporated in the
# source code or documentation are not subject to the GNU General Public
# License and may only be used or replicated with the express permission of
# Red Hat, Inc.
#
# Red Hat Author(s): Dave Lehman <dlehman@redhat.com>
#
from operator import gt, lt
from decimal import Decimal
import parted
from pykickstart.constants import AUTOPART_TYPE_BTRFS, AUTOPART_TYPE_LVM, AUTOPART_TYPE_LVM_THINP, AUTOPART_TYPE_PLAIN
from .errors import DeviceError, NoDisksError, NotEnoughFreeSpaceError, PartitioningError
from .flags import flags
from .devices import PartitionDevice, LUKSDevice, devicePathToName
from .devices.partition import FALLBACK_DEFAULT_PART_SIZE
from .formats import getFormat
from .devicelibs.lvm import get_pool_padding
from .size import Size
from .i18n import _
import logging
log = logging.getLogger("blivet")
def _getCandidateDisks(storage):
""" Return a list of disks to be used for autopart/reqpart.
Disks must be partitioned and have a single free region large enough
for a default-sized (500MiB) partition. They must also be in
:attr:`StorageDiscoveryConfig.clearPartDisks` if it is non-empty.
:param storage: a Blivet instance
:type storage: :class:`~.Blivet`
:returns: a list of partitioned disks with at least 500MiB of free space
:rtype: list of :class:`~.devices.StorageDevice`
"""
disks = []
for disk in storage.partitioned:
if storage.config.clearPartDisks and \
(disk.name not in storage.config.clearPartDisks):
continue
part = disk.format.firstPartition
while part:
if not part.type & parted.PARTITION_FREESPACE:
part = part.nextPartition()
continue
if Size(part.getLength(unit="B")) > PartitionDevice.defaultSize:
disks.append(disk)
break
part = part.nextPartition()
return disks
def _scheduleImplicitPartitions(storage, disks, min_luks_entropy=0):
""" Schedule creation of a lvm/btrfs member partitions for autopart.
We create one such partition on each disk. They are not allocated until
later (in :func:`doPartitioning`).
:param storage: a :class:`~.Blivet` instance
:type storage: :class:`~.Blivet`
:param disks: list of partitioned disks with free space
:type disks: list of :class:`~.devices.StorageDevice`
:param min_luks_entropy: minimum entropy in bits required for
luks format creation
:type min_luks_entropy: int
:returns: list of newly created (unallocated) partitions
:rtype: list of :class:`~.devices.PartitionDevice`
"""
# create a separate pv or btrfs partition for each disk with free space
devs = []
# only schedule the partitions if either lvm or btrfs autopart was chosen
if storage.autoPartType == AUTOPART_TYPE_PLAIN:
return devs
for disk in disks:
if storage.encryptedAutoPart:
fmt_type = "luks"
fmt_args = {"passphrase": storage.encryptionPassphrase,
"cipher": storage.encryptionCipher,
"escrow_cert": storage.autoPartEscrowCert,
"add_backup_passphrase": storage.autoPartAddBackupPassphrase,
"min_luks_entropy": min_luks_entropy}
else:
if storage.autoPartType in (AUTOPART_TYPE_LVM, AUTOPART_TYPE_LVM_THINP):
fmt_type = "lvmpv"
else:
fmt_type = "btrfs"
fmt_args = {}
part = storage.newPartition(fmt_type=fmt_type,
fmt_args=fmt_args,
grow=True,
parents=[disk])
storage.createDevice(part)
devs.append(part)
return devs
def _schedulePartitions(storage, disks, implicit_devices, min_luks_entropy=0, requests=None):
""" Schedule creation of autopart/reqpart partitions.
This only schedules the requests for actual partitions.
:param storage: a :class:`~.Blivet` instance
:type storage: :class:`~.Blivet`
:param disks: list of partitioned disks with free space
:type disks: list of :class:`~.devices.StorageDevice`
:param min_luks_entropy: minimum entropy in bits required for
luks format creation
:type min_luks_entropy: int
:param requests: list of partitioning requests to operate on,
or `~.storage.autoPartitionRequests` by default
:type requests: list of :class:`~.partspec.PartSpec` instances
:returns: None
:rtype: None
"""
if not requests:
requests = storage.autoPartitionRequests
# basis for requests with requiredSpace is the sum of the sizes of the
# two largest free regions
all_free = (Size(reg.getLength(unit="B")) for reg in getFreeRegions(disks))
all_free = sorted(all_free, reverse=True)
if not all_free:
# this should never happen since we've already filtered the disks
# to those with at least 500MiB free
log.error("no free space on disks %s", [d.name for d in disks])
return
free = all_free[0]
if len(all_free) > 1:
free += all_free[1]
# The boot disk must be set at this point. See if any platform-specific
# stage1 device we might allocate already exists on the boot disk.
stage1_device = None
for device in storage.devices:
if storage.bootloader.stage1_disk not in device.disks:
continue
if storage.bootloader.is_valid_stage1_device(device, early=True):
stage1_device = device
break
#
# First pass is for partitions only. We'll do LVs later.
#
for request in requests:
if ((request.lv and storage.doAutoPart and
storage.autoPartType in (AUTOPART_TYPE_LVM,
AUTOPART_TYPE_LVM_THINP)) or
(request.btr and storage.autoPartType == AUTOPART_TYPE_BTRFS)):
continue
if request.requiredSpace and request.requiredSpace > free:
continue
elif request.fstype in ("prepboot", "efi", "macefi", "hfs+") and \
(storage.bootloader.skip_bootloader or stage1_device):
# there should never be a need for more than one of these
# partitions, so skip them.
log.info("skipping unneeded stage1 %s request", request.fstype)
log.debug("%s", request)
if request.fstype in ["efi", "macefi"] and stage1_device:
# Set the mountpoint for the existing EFI boot partition
stage1_device.format.mountpoint = "/boot/efi"
log.debug("%s", stage1_device)
continue
elif request.fstype == "biosboot":
is_gpt = (stage1_device and
getattr(stage1_device.format, "labelType", None) == "gpt")
has_bios_boot = (stage1_device and
any([p.format.type == "biosboot"
for p in storage.partitions
if p.disk == stage1_device]))
if (storage.bootloader.skip_bootloader or
not (stage1_device and stage1_device.isDisk and
is_gpt and not has_bios_boot)):
# there should never be a need for more than one of these
# partitions, so skip them.
log.info("skipping unneeded stage1 %s request", request.fstype)
log.debug("%s", request)
log.debug("%s", stage1_device)
continue
if request.size > all_free[0]:
# no big enough free space for the requested partition
raise NotEnoughFreeSpaceError(_("No big enough free space on disks for "
"automatic partitioning"))
if request.encrypted and storage.encryptedAutoPart:
fmt_type = "luks"
fmt_args = {"passphrase": storage.encryptionPassphrase,
"cipher": storage.encryptionCipher,
"escrow_cert": storage.autoPartEscrowCert,
"add_backup_passphrase": storage.autoPartAddBackupPassphrase,
"min_luks_entropy": min_luks_entropy}
else:
fmt_type = request.fstype
fmt_args = {}
dev = storage.newPartition(fmt_type=fmt_type,
fmt_args=fmt_args,
size=request.size,
grow=request.grow,
maxsize=request.maxSize,
mountpoint=request.mountpoint,
parents=disks,
weight=request.weight)
# schedule the device for creation
storage.createDevice(dev)
if request.encrypted and storage.encryptedAutoPart:
luks_fmt = getFormat(request.fstype,
device=dev.path,
mountpoint=request.mountpoint)
luks_dev = LUKSDevice("luks-%s" % dev.name,
fmt=luks_fmt,
size=dev.size,
parents=dev)
storage.createDevice(luks_dev)
if storage.autoPartType in (AUTOPART_TYPE_LVM, AUTOPART_TYPE_LVM_THINP,
AUTOPART_TYPE_BTRFS):
# doing LVM/BTRFS -- make sure the newly created partition fits in some
# free space together with one of the implicitly requested partitions
smallest_implicit = sorted(implicit_devices, key=lambda d: d.size)[0]
if (request.size + smallest_implicit.size) > all_free[0]:
# not enough space to allocate the smallest implicit partition
# and the request, make the implicit partitions smaller in
# attempt to make space for the request
for implicit_req in implicit_devices:
implicit_req.size = FALLBACK_DEFAULT_PART_SIZE
return implicit_devices
def _scheduleVolumes(storage, devs):
""" Schedule creation of autopart lvm/btrfs volumes.
Schedules encryption of member devices if requested, schedules creation
of the container (:class:`~.devices.LVMVolumeGroupDevice` or
:class:`~.devices.BTRFSVolumeDevice`) then schedules creation of the
autopart volume requests.
:param storage: a :class:`~.Blivet` instance
:type storage: :class:`~.Blivet`
:param devs: list of member partitions
:type devs: list of :class:`~.devices.PartitionDevice`
:returns: None
:rtype: None
If an appropriate bootloader stage1 device exists on the boot drive, any
autopart request to create another one will be skipped/discarded.
"""
if not devs:
return
if storage.autoPartType in (AUTOPART_TYPE_LVM, AUTOPART_TYPE_LVM_THINP):
new_container = storage.newVG
new_volume = storage.newLV
format_name = "lvmpv"
else:
new_container = storage.newBTRFS
new_volume = storage.newBTRFS
format_name = "btrfs"
if storage.encryptedAutoPart:
pvs = []
for dev in devs:
pv = LUKSDevice("luks-%s" % dev.name,
fmt=getFormat(format_name, device=dev.path),
size=dev.size,
parents=dev)
pvs.append(pv)
storage.createDevice(pv)
else:
pvs = devs
# create a vg containing all of the autopart pvs
container = new_container(parents=pvs)
storage.createDevice(container)
#
# Convert storage.autoPartitionRequests into Device instances and
# schedule them for creation.
#
# Second pass, for LVs only.
pool = None
for request in storage.autoPartitionRequests:
btr = storage.autoPartType == AUTOPART_TYPE_BTRFS and request.btr
lv = (storage.autoPartType in (AUTOPART_TYPE_LVM,
AUTOPART_TYPE_LVM_THINP) and request.lv)
thinlv = (storage.autoPartType == AUTOPART_TYPE_LVM_THINP and
request.lv and request.thin)
if thinlv and pool is None:
# create a single thin pool in the vg
pool = storage.newLV(parents=[container], thin_pool=True, grow=True)
storage.createDevice(pool)
if not btr and not lv and not thinlv:
continue
# required space isn't relevant on btrfs
if (lv or thinlv) and \
request.requiredSpace and request.requiredSpace > container.size:
continue
if request.fstype is None:
if btr:
# btrfs volumes can only contain btrfs filesystems
request.fstype = "btrfs"
else:
request.fstype = storage.defaultFSType
kwargs = {"mountpoint": request.mountpoint,
"fmt_type": request.fstype}
if lv or thinlv:
if thinlv:
parents = [pool]
else:
parents = [container]
kwargs.update({"parents": parents,
"grow": request.grow,
"maxsize": request.maxSize,
"size": request.size,
"thin_volume": thinlv})
else:
kwargs.update({"parents": [container],
"size": request.size,
"subvol": True})
dev = new_volume(**kwargs)
# schedule the device for creation
storage.createDevice(dev)
def doReqPartition(storage, requests):
"""Perform automatic partitioning of just required platform-specific
partitions. This is incompatible with doAutoPartition.
:param storage: a :class:`~.Blivet` instance
:type storage: :class:`~.Blivet`
:param requests: list of partitioning requests to operate on,
or `~.storage.autoPartitionRequests` by default
:type requests: list of :class:`~.partspec.PartSpec` instances
"""
if not storage.partitioned:
raise NoDisksError(_("No usable disks selected"))
disks = _getCandidateDisks(storage)
if disks == []:
raise NotEnoughFreeSpaceError(_("Not enough free space on disks for "
"automatic partitioning"))
_schedulePartitions(storage, disks, [], requests=requests)
def doAutoPartition(storage, data, min_luks_entropy=0):
""" Perform automatic partitioning.
:param storage: a :class:`~.Blivet` instance
:type storage: :class:`~.Blivet`
:param data: kickstart data
:type data: :class:`pykickstart.BaseHandler`
:param min_luks_entropy: minimum entropy in bits required for
luks format creation
:type min_luks_entropy: int
:attr:`Blivet.doAutoPart` controls whether this method creates the
automatic partitioning layout. :attr:`Blivet.autoPartType` controls
which variant of autopart used. It uses one of the pykickstart
AUTOPART_TYPE_* constants. The set of eligible disks is defined in
:attr:`StorageDiscoveryConfig.clearPartDisks`.
.. note::
Clearing of partitions is handled separately, in
:meth:`~.Blivet.clearPartitions`.
"""
# pylint: disable=unused-argument
log.debug("doAutoPart: %s", storage.doAutoPart)
log.debug("encryptedAutoPart: %s", storage.encryptedAutoPart)
log.debug("autoPartType: %s", storage.autoPartType)
log.debug("clearPartType: %s", storage.config.clearPartType)
log.debug("clearPartDisks: %s", storage.config.clearPartDisks)
log.debug("autoPartitionRequests:\n%s", "".join([str(p) for p in storage.autoPartitionRequests]))
log.debug("storage.disks: %s", [d.name for d in storage.disks])
log.debug("storage.partitioned: %s", [d.name for d in storage.partitioned])
log.debug("all names: %s", [d.name for d in storage.devices])
log.debug("boot disk: %s", getattr(storage.bootDisk, "name", None))
disks = []
devs = []
if not storage.doAutoPart:
return
if not storage.partitioned:
raise NoDisksError(_("No usable disks selected"))
disks = _getCandidateDisks(storage)
devs = _scheduleImplicitPartitions(storage, disks, min_luks_entropy)
log.debug("candidate disks: %s", disks)
log.debug("devs: %s", devs)
if disks == []:
raise NotEnoughFreeSpaceError(_("Not enough free space on disks for "
"automatic partitioning"))
devs = _schedulePartitions(storage, disks, devs, min_luks_entropy=min_luks_entropy)
# run the autopart function to allocate and grow partitions
doPartitioning(storage)
_scheduleVolumes(storage, devs)
# grow LVs
growLVM(storage)
storage.setUpBootLoader()
# only newly added swaps should appear in the fstab
new_swaps = (dev for dev in storage.swaps if not dev.format.exists)
storage.setFstabSwaps(new_swaps)
def partitionCompare(part1, part2):
""" More specifically defined partitions come first.
< 1 => x < y
0 => x == y
> 1 => x > y
:param part1: the first partition
:type part1: :class:`devices.PartitionDevice`
:param part2: the other partition
:type part2: :class:`devices.PartitionDevice`
:return: see above
:rtype: int
"""
ret = 0
# start sector overrides all other sorting factors
part1_start = part1.req_start_sector
part2_start = part2.req_start_sector
if part1_start is not None and part2_start is None:
return -1
elif part1_start is None and part2_start is not None:
return 1
elif part1_start is not None and part2_start is not None:
return cmp(part1_start, part2_start)
if part1.req_base_weight:
ret -= part1.req_base_weight
if part2.req_base_weight:
ret += part2.req_base_weight
# more specific disk specs to the front of the list
# req_disks being empty is equivalent to it being an infinitely long list
if part1.req_disks and not part2.req_disks:
ret -= 500
elif not part1.req_disks and part2.req_disks:
ret += 500
else:
ret += cmp(len(part1.req_disks), len(part2.req_disks)) * 500
# primary-only to the front of the list
ret -= cmp(part1.req_primary, part2.req_primary) * 200
# fixed size requests to the front
ret += cmp(part1.req_grow, part2.req_grow) * 100
# larger requests go to the front of the list
ret -= cmp(part1.req_base_size, part2.req_base_size) * 50
# potentially larger growable requests go to the front
if part1.req_grow and part2.req_grow:
if not part1.req_max_size and part2.req_max_size:
ret -= 25
elif part1.req_max_size and not part2.req_max_size:
ret += 25
else:
ret -= cmp(part1.req_max_size, part2.req_max_size) * 25
# give a little bump based on mountpoint
if hasattr(part1.format, "mountpoint") and \
hasattr(part2.format, "mountpoint"):
ret += cmp(part1.format.mountpoint, part2.format.mountpoint) * 10
if ret > 0:
ret = 1
elif ret < 0:
ret = -1
return ret
def getNextPartitionType(disk, no_primary=None):
""" Return the type of partition to create next on a disk.
Return a parted partition type value representing the type of the
next partition we will create on this disk.
If there is only one free primary partition and we can create an
extended partition, we do that.
If there are free primary slots and an extended partition we will
recommend creating a primary partition. This can be overridden
with the keyword argument no_primary.
:param disk: the disk from which a partition may be allocated
:type disk: :class:`parted.Disk`
:keyword no_primary: refuse to return :const:`parted.PARTITION_NORMAL`
:returns: the chosen partition type
:rtype: a parted PARTITION_* constant
"""
part_type = None
extended = disk.getExtendedPartition()
supports_extended = disk.supportsFeature(parted.DISK_TYPE_EXTENDED)
logical_count = len(disk.getLogicalPartitions())
max_logicals = disk.getMaxLogicalPartitions()
primary_count = disk.primaryPartitionCount
if primary_count < disk.maxPrimaryPartitionCount:
if primary_count == disk.maxPrimaryPartitionCount - 1:
# can we make an extended partition? now's our chance.
if not extended and supports_extended:
part_type = parted.PARTITION_EXTENDED
elif not extended:
# extended partitions not supported. primary or nothing.
if not no_primary:
part_type = parted.PARTITION_NORMAL
else:
# there is an extended and a free primary
if not no_primary:
part_type = parted.PARTITION_NORMAL
elif logical_count < max_logicals:
# we have an extended with logical slots, so use one.
part_type = parted.PARTITION_LOGICAL
else:
# there are two or more primary slots left. use one unless we're
# not supposed to make primaries.
if not no_primary:
part_type = parted.PARTITION_NORMAL
elif extended and logical_count < max_logicals:
part_type = parted.PARTITION_LOGICAL
elif extended and logical_count < max_logicals:
part_type = parted.PARTITION_LOGICAL
return part_type
def getBestFreeSpaceRegion(disk, part_type, req_size, start=None,
boot=None, best_free=None, grow=None):
""" Return the "best" free region on the specified disk.
For non-boot partitions, we return the largest free region on the
disk. For boot partitions, we return the first region that is
large enough to hold the partition.
Partition type (parted's PARTITION_NORMAL, PARTITION_LOGICAL) is
taken into account when locating a suitable free region.
For locating the best region from among several disks, the keyword
argument best_free allows the specification of a current "best"
free region with which to compare the best from this disk. The
overall best region is returned.
:param disk: the disk
:type disk: :class:`parted.Disk`
:param part_type: the type of partition we want to allocate
:type part_type: one of parted's PARTITION_* constants
:param req_size: the requested size of the partition in MiB
:type req_size: :class:`~.size.Size`
:keyword start: requested start sector for the partition
:type start: int
:keyword boot: whether this will be a bootable partition
:type boot: bool
:keyword best_free: current best free region for this partition
:type best_free: :class:`parted.Geometry`
:keyword grow: indicates whether this is a growable request
:type grow: bool
"""
log.debug("getBestFreeSpaceRegion: disk=%s part_type=%d req_size=%s "
"boot=%s best=%s grow=%s start=%s",
disk.device.path, part_type, req_size, boot, best_free, grow,
start)
extended = disk.getExtendedPartition()
for free_geom in disk.getFreeSpaceRegions():
log.debug("checking %d-%d (%s)", free_geom.start, free_geom.end,
Size(free_geom.getLength(unit="B")))
if start is not None and not free_geom.containsSector(start):
log.debug("free region does not contain requested start sector")
continue
if extended:
in_extended = extended.geometry.contains(free_geom)
if ((in_extended and part_type == parted.PARTITION_NORMAL) or
(not in_extended and part_type == parted.PARTITION_LOGICAL)):
log.debug("free region not suitable for request")
continue
if free_geom.start > disk.maxPartitionStartSector:
log.debug("free range start sector beyond max for new partitions")
continue
if boot:
max_boot = Size("2 TiB")
free_start = Size(free_geom.start * disk.device.sectorSize)
req_end = free_start + req_size
if req_end > max_boot:
log.debug("free range position would place boot req above %s",
max_boot)
continue
log.debug("current free range is %d-%d (%s)", free_geom.start,
free_geom.end,
Size(free_geom.getLength(unit="B")))
free_size = Size(free_geom.getLength(unit="B"))
# For boot partitions, we want the first suitable region we find.
# For growable or extended partitions, we want the largest possible
# free region.
# For all others, we want the smallest suitable free region.
if grow or part_type == parted.PARTITION_EXTENDED:
op = gt
else:
op = lt
if req_size <= free_size:
if not best_free or op(free_geom.length, best_free.length):
best_free = free_geom
if boot:
# if this is a bootable partition we want to
# use the first freespace region large enough
# to satisfy the request
break
return best_free
def sectorsToSize(sectors, sectorSize):
""" Convert length in sectors to size.
:param sectors: sector count
:type sectors: int
:param sectorSize: sector size
:type sectorSize: :class:`~.size.Size`
:returns: the size
:rtype: :class:`~.size.Size`
"""
return Size(sectors * sectorSize)
def sizeToSectors(size, sectorSize):
""" Convert size to length in sectors.
:param size: size
:type size: :class:`~.size.Size`
:param sectorSize: sector size in bytes
:type sectorSize: :class:`~.size.Size`
:returns: sector count
:rtype: int
"""
sectors = int(size / sectorSize)
return sectors
def removeNewPartitions(disks, remove, all_partitions):
""" Remove newly added partitions from disks.
Remove all non-existent partitions from the disks in blivet's model.
:param: disks: list of partitioned disks
:type disks: list of :class:`~.devices.StorageDevice`
:param remove: list of partitions to remove
:type remove: list of :class:`~.devices.PartitionDevice`
:param all_partitions: list of all partitions on the disks
:type all_partitions: list of :class:`~.devices.PartitionDevice`
:returns: None
:rtype: NoneType
"""
log.debug("removing all non-preexisting partitions %s from disk(s) %s",
["%s(id %d)" % (p.name, p.id) for p in remove],
[d.name for d in disks])
for part in remove:
if part.partedPartition and part.disk in disks:
if part.exists:
# we're only removing partitions that don't physically exist
continue
if part.isExtended:
# these get removed last
continue
part.disk.format.partedDisk.removePartition(part.partedPartition)
part.partedPartition = None
part.disk = None
for disk in disks:
# remove empty extended so it doesn't interfere
extended = disk.format.extendedPartition
if extended and not disk.format.logicalPartitions and \
(flags.installer_mode or
extended not in (p.partedPartition for p in all_partitions)):
log.debug("removing empty extended partition from %s", disk.name)
disk.format.partedDisk.removePartition(extended)
def addPartition(disklabel, free, part_type, size, start=None, end=None):
""" Add a new partition to a disk.
:param disklabel: the disklabel to add the partition to
:type disklabel: :class:`~.formats.DiskLabel`
:param free: the free region in which to place the new partition
:type free: :class:`parted.Geometry`
:param part_type: the partition type
:type part_type: a parted.PARTITION_* constant
:param size: size of the new partition
:type size: :class:`~.size.Size`
:keyword start: starting sector for the partition
:type start: int
:keyword end: ending sector for the partition
:type end: int
:raises: :class:`~.errors.PartitioningError`
:returns: the newly added partitions
:rtype: :class:`parted.Partition`
.. note::
The new partition will be aligned using the kernel-provided optimal
alignment unless a start sector is provided.
"""
sectorSize = Size(disklabel.partedDevice.sectorSize)
if start is not None:
if end is None:
end = start + sizeToSectors(size, sectorSize) - 1
else:
start = free.start
if not disklabel.alignment.isAligned(free, start):
start = disklabel.alignment.alignNearest(free, start)
if disklabel.labelType == "sun" and start == 0:
start = disklabel.alignment.alignUp(free, start)
if part_type == parted.PARTITION_LOGICAL:
# make room for logical partition's metadata
start += disklabel.alignment.grainSize
if start != free.start:
log.debug("adjusted start sector from %d to %d", free.start, start)
if part_type == parted.PARTITION_EXTENDED and not size:
end = free.end
length = end - start + 1
else:
length = sizeToSectors(size, sectorSize)
end = start + length - 1
if not disklabel.endAlignment.isAligned(free, end):
end = disklabel.endAlignment.alignUp(free, end)
log.debug("adjusted length from %d to %d", length, end - start + 1)
if start > end:
raise PartitioningError(_("unable to allocate aligned partition"))
new_geom = parted.Geometry(device=disklabel.partedDevice,
start=start,
end=end)
max_length = disklabel.partedDisk.maxPartitionLength
if max_length and new_geom.length > max_length:
raise PartitioningError(_("requested size exceeds maximum allowed"))
# create the partition and add it to the disk
partition = parted.Partition(disk=disklabel.partedDisk,
type=part_type,
geometry=new_geom)
constraint = parted.Constraint(exactGeom=new_geom)
disklabel.partedDisk.addPartition(partition=partition,
constraint=constraint)
return partition
def getFreeRegions(disks):
""" Return a list of free regions on the specified disks.
:param disks: list of disks
:type disks: list of :class:`~.devices.Disk`
:returns: list of free regions
:rtype: list of :class:`parted.Geometry`
Only free regions guaranteed to contain at least one aligned sector for
both the start and end alignments in the
:class:`~.formats.disklabel.DiskLabel` are returned.
"""
free = []
for disk in disks:
for f in disk.format.partedDisk.getFreeSpaceRegions():
if f.length >= disk.format.alignment.grainSize:
free.append(f)
return free
def updateExtendedPartitions(storage, disks):
""" Reconcile extended partition changes with the DeviceTree.
:param storage: the Blivet instance
:type storage: :class:`~.Blivet`
:param disks: list of disks
:type disks: list of :class:`~.devices.StorageDevice`
:returns: :const:`None`
:rtype: NoneType
"""
# XXX hack -- if we created any extended partitions we need to add
# them to the tree now
for disk in disks:
extended = disk.format.extendedPartition
if not extended:
# remove any obsolete extended partitions
for part in storage.partitions:
if part.disk == disk and part.isExtended:
if part.exists:
storage.destroyDevice(part)
else:
storage.devicetree._removeDevice(part, modparent=False)
continue
extendedName = devicePathToName(extended.getDeviceNodeName())
device = storage.devicetree.getDeviceByName(extendedName)
if device:
if not device.exists:
# created by us, update partedPartition
device.partedPartition = extended
# remove any obsolete extended partitions
for part in storage.partitions:
if part.disk == disk and part.isExtended and \
part.partedPartition not in disk.format.partitions:
if part.exists:
storage.destroyDevice(part)
else:
storage.devicetree._removeDevice(part, modparent=False)
if device:
continue
# This is a little odd because normally instantiating a partition
# that does not exist means leaving self.parents empty and instead
# populating self.req_disks. In this case, we need to skip past
# that since this partition is already defined.
device = PartitionDevice(extendedName, parents=disk)
device.parents = [disk]
device.partedPartition = extended
# just add the device for now -- we'll handle actions at the last
# moment to simplify things
storage.devicetree._addDevice(device)
def doPartitioning(storage):
""" Allocate and grow partitions.
When this function returns without error, all PartitionDevice
instances must have their parents set to the disk they are
allocated on, and their partedPartition attribute set to the
appropriate parted.Partition instance from their containing
disk. All req_xxxx attributes must be unchanged.
:param storage: Blivet instance
:type storage: :class:`~.Blivet`
:raises: :class:`~.errors.PartitioningError`
:returns: :const:`None`
"""
disks = [d for d in storage.partitioned if not d.protected]
for disk in disks:
try:
disk.setup()
except DeviceError as e:
log.error("failed to set up disk %s: %s", disk.name, e)
raise PartitioningError(_("disk %s inaccessible") % disk.name)
# Remove any extended partition that does not have an action associated.
#
# XXX This does not remove the extended from the parted.Disk, but it should
# cause removeNewPartitions to remove it since there will no longer be
# a PartitionDevice for it.
for partition in storage.partitions:
if not partition.exists and partition.isExtended and \
not storage.devicetree.findActions(device=partition, action_type="create"):
storage.devicetree._removeDevice(partition, modparent=False, force=True)
partitions = storage.partitions[:]
for part in storage.partitions:
part.req_bootable = False
if not part.exists:
# start over with flexible-size requests
part.req_size = part.req_base_size
try:
storage.bootDevice.req_bootable = True
except AttributeError:
# there's no stage2 device. hopefully it's temporary.
pass
removeNewPartitions(disks, partitions, partitions)
free = getFreeRegions(disks)
try:
allocatePartitions(storage, disks, partitions, free)
growPartitions(disks, partitions, free, size_sets=storage.size_sets)
except Exception:
raise
else:
# Mark all growable requests as no longer growable.
for partition in storage.partitions:
log.debug("fixing size of %s", partition)
partition.req_grow = False
partition.req_base_size = partition.size
partition.req_size = partition.size
finally:
# these are only valid for one allocation run
storage.size_sets = []
# The number and thus the name of partitions may have changed now,
# allocatePartitions() takes care of this for new partitions, but not
# for pre-existing ones, so we update the name of all partitions here
for part in storage.partitions:
# leave extended partitions as-is -- we'll handle them separately
if part.isExtended:
continue
part.updateName()
updateExtendedPartitions(storage, disks)
for part in [p for p in storage.partitions if not p.exists]:
problem = part.checkSize()
if problem < 0:
raise PartitioningError(_("partition is too small for %(format)s formatting "
"(allowable size is %(minSize)s to %(maxSize)s)")
% {"format": part.format.name, "minSize": part.format.minSize,
"maxSize": part.format.maxSize})
elif problem > 0:
raise PartitioningError(_("partition is too large for %(format)s formatting "
"(allowable size is %(minSize)s to %(maxSize)s)")
% {"format": part.format.name, "minSize": part.format.minSize,
"maxSize": part.format.maxSize})
def allocatePartitions(storage, disks, partitions, freespace):
""" Allocate partitions based on requested features.
:param storage: a Blivet instance
:type storage: :class:`~.Blivet`
:param disks: list of usable disks
:type disks: list of :class:`~.devices.StorageDevice`
:param partitions: list of partitions
:type partitions: list of :class:`~.devices.PartitionDevice`
:param freespace: list of free regions on disks
:type freespace: list of :class:`parted.Geometry`
:raises: :class:`~.errors.PartitioningError`
:returns: :const:`None`
Non-existing partitions are sorted according to their requested
attributes, and then allocated.
The basic approach to sorting is that the more specifically-
defined a request is, the earlier it will be allocated. See
:func:`partitionCompare` for details of the sorting criteria.
The :class:`~.devices.PartitionDevice` instances will have their name
and parents attributes set once they have been allocated.
"""
log.debug("allocatePartitions: disks=%s ; partitions=%s",
[d.name for d in disks],
["%s(id %d)" % (p.name, p.id) for p in partitions])
new_partitions = [p for p in partitions if not p.exists]
new_partitions.sort(cmp=partitionCompare)
# the following dicts all use device path strings as keys
disklabels = {} # DiskLabel instances for each disk
all_disks = {} # StorageDevice for each disk
for disk in disks:
if disk.path not in disklabels.keys():