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authorJelmer Vernooij <jelmer@samba.org>2008-02-25 20:39:16 +0100
committerJelmer Vernooij <jelmer@samba.org>2008-02-25 20:39:16 +0100
commitd7b1bf7718704709205a919c38eecaa011eef2e6 (patch)
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parentf5be3c3184119ed8370aedc3de2cb4aed21e38cc (diff)
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Remove obsolete comment.
(This used to be commit 5dda8b1eba628c40f0ddad93b73c0a749ac3e908)
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generated by cgit (git 2.34.1) at 2025-10-17 07:57:09 +0000
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# deviceaction.py
# Device modification action classes for anaconda's storage configuration
# module.
#
# Copyright (C) 2009  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 udev import *
import math

from devices import StorageDevice
from devices import PartitionDevice
from devices import LVMLogicalVolumeDevice
from formats import getFormat
from errors import *
from parted import partitionFlag, PARTITION_LBA

import gettext
_ = lambda x: gettext.ldgettext("anaconda", x)

import logging
log = logging.getLogger("storage")


# The values are just hints as to the ordering.
# Eg: fsmod and devmod ordering depends on the mod (shrink -v- grow)
ACTION_TYPE_NONE = 0
ACTION_TYPE_DESTROY = 1000
ACTION_TYPE_RESIZE = 500
ACTION_TYPE_MIGRATE = 250
ACTION_TYPE_CREATE = 100

action_strings = {ACTION_TYPE_NONE: "None",
                  ACTION_TYPE_DESTROY: "Destroy",
                  ACTION_TYPE_RESIZE: "Resize",
                  ACTION_TYPE_MIGRATE: "Migrate",
                  ACTION_TYPE_CREATE: "Create"}

ACTION_OBJECT_NONE = 0
ACTION_OBJECT_FORMAT = 1
ACTION_OBJECT_DEVICE = 2

object_strings = {ACTION_OBJECT_NONE: "None",
                  ACTION_OBJECT_FORMAT: "Format",
                  ACTION_OBJECT_DEVICE: "Device"}

RESIZE_SHRINK = 88
RESIZE_GROW = 89

resize_strings = {RESIZE_SHRINK: "Shrink",
                  RESIZE_GROW: "Grow"}

def action_type_from_string(type_string):
    if type_string is None:
        return None

    for (k,v) in action_strings.items():
        if v.lower() == type_string.lower():
            return k

    return resize_type_from_string(type_string)

def action_object_from_string(type_string):
    if type_string is None:
        return None

    for (k,v) in object_strings.items():
        if v.lower() == type_string.lower():
            return k

def resize_type_from_string(type_string):
    if type_string is None:
        return None

    for (k,v) in resize_strings.items():
        if v.lower() == type_string.lower():
            return k

class DeviceAction(object):
    """ An action that will be carried out in the future on a Device.

        These classes represent actions to be performed on devices or
        filesystems.

        The operand Device instance will be modified according to the
        action, but no changes will be made to the underlying device or
        filesystem until the DeviceAction instance's execute method is
        called. The DeviceAction instance's cancel method should reverse
        any modifications made to the Device instance's attributes.

        If the Device instance represents a pre-existing device, the
        constructor should call any methods or set any attributes that the
        action will eventually change. Device/DeviceFormat classes should verify
        that the requested modifications are reasonable and raise an
        exception if not.

        Only one action of any given type/object pair can exist for any
        given device at any given time. This is enforced by the
        DeviceTree.

        Basic usage:

            a = DeviceAction(dev)
            a.execute()

            OR

            a = DeviceAction(dev)
            a.cancel()


        XXX should we back up the device with a deep copy for forcibly
            cancelling actions?

            The downside is that we lose any checking or verification that
            would get done when resetting the Device instance's attributes to
            their original values.

            The upside is that we would be guaranteed to achieve a total
            reversal. No chance of, eg: resizes ending up altering Device
            size due to rounding or other miscalculation.
"""
    type = ACTION_TYPE_NONE
    obj = ACTION_OBJECT_NONE
    _id = 0

    def __init__(self, device):
        if not isinstance(device, StorageDevice):
            raise ValueError("arg 1 must be a StorageDevice instance")
        self.device = device

        # Establish a unique id for each action instance. Making shallow or
        # deep copyies of DeviceAction instances will require __copy__ and
        # __deepcopy__ methods to handle incrementing the id in the copy
        self.id = DeviceAction._id
        DeviceAction._id += 1

    def execute(self):
        """ perform the action """
        pass

    def cancel(self):
        """ cancel the action """
        pass

    @property
    def isDestroy(self):
        return self.type == ACTION_TYPE_DESTROY

    @property
    def isCreate(self):
        return self.type == ACTION_TYPE_CREATE

    @property
    def isMigrate(self):
        return self.type == ACTION_TYPE_MIGRATE

    @property
    def isResize(self):
        return self.type == ACTION_TYPE_RESIZE

    @property
    def isShrink(self):
        return (self.type == ACTION_TYPE_RESIZE and self.dir == RESIZE_SHRINK)

    @property
    def isGrow(self):
        return (self.type == ACTION_TYPE_RESIZE and self.dir == RESIZE_GROW)

    @property
    def isDevice(self):
        return self.obj == ACTION_OBJECT_DEVICE

    @property
    def isFormat(self):
        return self.obj == ACTION_OBJECT_FORMAT

    @property
    def format(self):
        return self.device.format

    def __str__(self):
        s = "[%d] %s %s" % (self.id, action_strings[self.type],
                            object_strings[self.obj])
        if self.isResize:
            s += " (%s)" % resize_strings[self.dir]
        if self.isFormat:
            s += " %s" % self.format.desc
            if self.isMigrate:
                s += " to %s" % self.format.migrationTarget
            s += " on"
        s += " %s %s (id %d)" % (self.device.type, self.device.name,
                                 self.device.id)
        return s

    def requires(self, action):
        """ Return True if self requires action. """
        return False

    def obsoletes(self, action):
        """ Return True is self obsoletes action.

            DeviceAction instances obsolete other DeviceAction instances with
            lower id and same device.
        """
        return (self.device.id == action.device.id and
                self.type == action.type and
                self.obj == action.obj and
                self.id > action.id)


class ActionCreateDevice(DeviceAction):
    """ Action representing the creation of a new device. """
    type = ACTION_TYPE_CREATE
    obj = ACTION_OBJECT_DEVICE

    def __init__(self, device):
        if device.exists:
            raise ValueError("device already exists")

        # FIXME: assert device.fs is None
        DeviceAction.__init__(self, device)

    def execute(self):
        self.device.create()

    def requires(self, action):
        """ Return True if self requires action.

            Device create actions require other actions when either of the
            following is true:

                - this action's device depends on the other action's device
                - both actions are partition create actions on the same disk
                  and this partition has a higher number
        """
        rc = False
        if self.device.dependsOn(action.device):
            rc = True
        elif (action.isCreate and action.isDevice and
              isinstance(self.device, PartitionDevice) and
              isinstance(action.device, PartitionDevice) and
              self.device.disk == action.device.disk):
            # create partitions in ascending numerical order
            selfNum = self.device.partedPartition.number
            otherNum = action.device.partedPartition.number
            if selfNum > otherNum:
                rc = True
        elif (action.isCreate and action.isDevice and
              isinstance(self.device, LVMLogicalVolumeDevice) and
              isinstance(action.device, LVMLogicalVolumeDevice) and
              self.device.vg == action.device.vg and
              action.device.singlePV and not self.device.singlePV):
            rc = True
        return rc


class ActionDestroyDevice(DeviceAction):
    """ An action representing the deletion of an existing device. """
    type = ACTION_TYPE_DESTROY
    obj = ACTION_OBJECT_DEVICE

    def __init__(self, device):
        # XXX should we insist that device.fs be None?
        DeviceAction.__init__(self, device)
        if device.exists:
            device.teardown()

    def execute(self):
        self.device.destroy()

        # Make sure libparted does not keep cached info for this device
        # and returns it when we create a new device with the same name
        if self.device.partedDevice:
            try:
                self.device.partedDevice.removeFromCache()
            except Exception:
                pass

    def requires(self, action):
        """ Return True if self requires action.

            Device destroy actions require other actions when either of the
            following is true:

                - the other action's device depends on this action's device
                - both actions are partition create actions on the same disk
                  and this partition has a lower number
        """
        rc = False
        if action.device.dependsOn(self.device) and action.isDestroy:
            rc = True
        elif (action.isDestroy and action.isDevice and
              isinstance(self.device, PartitionDevice) and
              isinstance(action.device, PartitionDevice) and