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#
# Copyright 2006 sense.lab e.V.
#
# This file is part of the CryptoBox.
#
# The CryptoBox is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# The CryptoBox is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty 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 the CryptoBox; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
"""The partition feature of the CryptoBox.
"""
__revision__ = "$Id$"
import subprocess
import os
import re
import logging
import cryptobox.core.blockdevice as blockdevice_tools
import cryptobox.plugins.base
from cryptobox.core.exceptions import *
PARTTYPES = {
"windows" : ["0xC", "vfat"],
"linux" : ["L", "ext3"]}
CONFIGPARTITION = {
"size" : 5, # size of configuration partition (if necessary) in MB
"type" : "L",
"fs" : "ext2"}
class partition(cryptobox.plugins.base.CryptoBoxPlugin):
"""The partition feature of the CryptoBox.
"""
plugin_capabilities = [ "system" ]
plugin_visibility = [ "preferences" ]
request_auth = True
rank = 80
def do_action(self, **args):
"""Show the partitioning form and execute the requested action.
"""
## load default hdf values
self.__prepare_dataset()
## retrieve some values from 'args' - defaults are empty
self.blockdevice = self.__get_selected_device(args)
if self.blockdevice:
self.with_config_partition = self.__is_with_config_partition()
self.blockdevice_size = self.__get_available_device_size(self.blockdevice)
else:
self.with_config_partition = False
self.blockdevice_size = 0
self.cbox.log.debug(
"partition plugin: selected device=%s" % str(self.blockdevice))
## no (or invalid) device was supplied
if not self.blockdevice:
return self.__action_select_device()
## exit if the blockdevice is not writeable
if not os.access(self.blockdevice.get_device(), os.W_OK):
self.hdf["Data.Warning"] = "DeviceNotWriteable"
return self.__action_select_device()
## no confirm setting?
if not args.has_key("confirm") or (args["confirm"] != "1"):
self.hdf["Data.Warning"] = "Plugins.partition.FormatNotConfirmed"
return self.__action_select_device()
elif args.has_key("easy"):
return self.__action_easy_setup()
elif args.has_key("add_part"):
return self.__action_add_partition(args)
elif args.has_key("finish"):
return self.__action_finish(args)
elif args.has_key("cancel"):
return self.__action_select_device()
## check if we should remove a partition
del_args = [ e for e in args.keys() if re.match(r"del_part_[\d]+$", e) ]
if len(del_args) == 1:
try:
num_part = int(del_args[0][9:])
except ValueError:
self.cbox.log.warn(
"partition: invalid partition number to delete (%s)" % del_args[0])
return self.__action_select_device()
return self.__action_del_partition(args, num_part)
else:
## for "select_device" and for invalid targets
return self.__action_select_device()
def get_status(self):
"""The status of this plugin is the selected device and some information.
"""
if not self.blockdevice:
return "no blockdevice selected"
else:
return "%s / %s / %s" % (self.blockdevice.name,
self.blockdevice_size, self.with_config_partition)
def get_warnings(self):
warnings = []
## this check is done _after_ "reset_dataset" -> if there is
## a config partition, then it was loaded before
if self.cbox.prefs.requires_partition() \
and not self.cbox.prefs.get_active_partition():
warnings.append((50, "Plugins.%s.ReadOnlyConfig" % self.get_name()))
## check required programs
if not os.path.isfile(self.root_action.SFDISK_BIN):
warnings.append((53, "Plugins.%s.MissingProgramSfdisk" % self.get_name()))
if not os.path.isfile(self.root_action.MKFS_BIN):
warnings.append((56, "Plugins.%s.MissingProgramMkfs" % self.get_name()))
if not os.path.isfile(self.root_action.LABEL_BIN):
warnings.append((40, "Plugins.%s.MissingProgramE2label" % self.get_name()))
return warnings
def __prepare_dataset(self):
"""Set some hdf values.
"""
self.hdf["Data.AdditionalStylesheets.%s" % self.get_name()] = \
os.path.join(self.plugin_dir, "partition.css")
self.hdf[self.hdf_prefix + "PluginDir"] = self.plugin_dir
def __get_selected_device(self, args):
"""Check the selected device (valid, not busy, ...).
"""
try:
blockdevice_name = args["block_device"]
found = [ dev for dev in
blockdevice_tools.Blockdevices().get_partitionable_devices()
if dev.name == blockdevice_name ]
if not found:
return None
blockdevice = found[0]
except KeyError:
return None
if not self.__is_device_valid(blockdevice):
return None
if self.__is_device_busy(blockdevice):
self.hdf["Data.Warning"] = "Plugins.partition.DiskIsBusy"
return None
return blockdevice
def __is_device_valid(self, blockdevice):
"""Check if the device is valid and allowed.
"""
if not blockdevice:
return False
if not self.cbox.is_device_allowed(blockdevice):
return False
return True
def __is_device_busy(self, blockdevice):
"""check if the device (or one of its partitions) is mounted
"""
## the config partition is ignored, as it will get unmounted if necessary
for dev in blockdevice.children:
container = self.cbox.get_container(
blockdevice_tools.get_blockdevice(dev))
if container and (container.is_mounted() or container.is_busy()):
return True
return False
def __action_select_device(self):
"""Show a form to select the device for partitioning.
"""
block_devices = [ e for e in
blockdevice_tools.Blockdevices().get_partitionable_devices()
if self.cbox.is_device_allowed(e) ]
counter = 0
for dev in block_devices:
self.hdf[self.hdf_prefix + "BlockDevices.%d.name" % counter] = \
dev.name
self.hdf[self.hdf_prefix + "BlockDevices.%d.size" % counter] = \
dev.size_human
self.cbox.log.debug("found a suitable block device: %s" % \
dev.get_device())
counter += 1
if self.with_config_partition:
self.hdf[self.hdf_prefix + "CreateConfigPartition"] = "1"
## there is no disk available
if not block_devices:
self.hdf["Data.Warning"] = "Plugins.partition.NoDisksAvailable"
return "select_device"
def __action_add_partition(self, args):
"""Add a selected partition to the currently proposed partition table.
"""
self.hdf[self.hdf_prefix + "Device"] = self.blockdevice.name
self.hdf[self.hdf_prefix + "Device.Size"] = self.blockdevice_size
parts = self.__get_partitions_from_args(args)
self.__set_partition_data(parts)
return "set_partitions"
def __action_del_partition(self, args, part_num):
"""Remove a partition from the proposed partition table.
"""
self.hdf[self.hdf_prefix + "Device"] = self.blockdevice.name
self.hdf[self.hdf_prefix + "Device.Size"] = self.blockdevice_size
parts = self.__get_partitions_from_args(args)
## valid partition number to be deleted?
if part_num < len(parts):
del parts[part_num]
self.__set_partition_data(parts)
return "set_partitions"
def __action_finish(self, args):
"""Write the partition table.
"""
parts = self.__get_partitions_from_args(args)
if parts:
self.__set_partition_data(parts)
## umount config partition if necessary
config_partition = self.cbox.prefs.get_active_partition()
if [ dev for dev in self.blockdevice.children
if config_partition in
blockdevice_tools.get_blockdevice(dev).devnodes ]:
self.cbox.prefs.umount_partition()
if not self.__run_fdisk(parts):
self.hdf["Data.Warning"] = "Plugins.partition.PartitioningFailed"
self.cbox.log.warn(
"partition: failed to partition device: %s" % self.blockdevice)
return self.__action_add_partition(args)
else:
## tricky problem: if the device was partitioned, then a created config
## partition is still part of the containerlist, as the label is not
## checked again - very ugly!!! So we will call reReadContainerList
## after formatting the last partition - see below
#self.cbox.reread_container_list()
format_ok = True
counter = 0
## initialize the generator
format_part_gen = self.__format_partitions(parts)
while counter < len(parts):
## first part: get the device name
counter += 1
## second part: do the real formatting of a partition
result = format_part_gen.next()
## after the first partiton, we can reRead the containerList
## (as the possible config partition was already created)
if self.with_config_partition and (counter == 1):
## important: reRead the containerList - but somehow it
## breaks the flow (hanging process)
#self.cbox.reReadContainerList()
## write config data
self.cbox.prefs.mount_partition()
try:
self.cbox.prefs.write()
self.cbox.log.info("settings stored on config partition")
except IOError:
self.cbox.log.warn(
"Failed to store settings on new config partition")
## return the result
if not result:
format_ok = False
self.cbox.reread_container_list()
if format_ok:
self.hdf["Data.Success"] = "Plugins.partition.Partitioned"
return { "plugin":"system_preferences", "values":[] }
else:
self.hdf["Data.Warning"] = "Plugins.partition.FormattingFailed"
return "empty"
else:
return self.__action_add_partition(args)
def __action_easy_setup(self):
"""Do automatic partitioning (create only one big partition).
"""
import types
## we do not have to take special care for a possible config partition
parts = [ { "size": self.blockdevice_size, "type": "windows" } ]
## umount config partition if necessary
config_partition = self.cbox.prefs.get_active_partition()
if [ dev for dev in self.blockdevice.children
if config_partition in
blockdevice_tools.get_blockdevice(dev).devnodes ]:
self.cbox.prefs.umount_partition()
## partition it
if not self.__run_fdisk(parts):
self.hdf["Data.Warning"] = "Plugins.partition.PartitioningFailed"
return None
## "formatPartitions" is a generator, returning device names and boolean values
result = [e for e in self.__format_partitions(parts)
if type(e) == types.BooleanType]
if self.with_config_partition:
self.cbox.prefs.mount_partition()
if not self.cbox.prefs.write():
self.cbox.log.warn("Failed to store settings on new config partition")
## check if there is a "False" return value
if False in result:
## operation failed
self.hdf["Data.Warning"] = "Plugins.partition.FormattingFailed"
self.cbox.log.info("easy partitioning failed")
return "set_partitions"
else:
## operation was successful
self.hdf["Data.Success"] = "Plugins.partition.EasySetup"
self.cbox.log.info("easy partitioning succeeded")
## do not show the disk overview immediately
## it does not get updated that fast
return { "plugin":"system_preferences", "values":[] }
def __set_partition_data(self, parts):
"""Set some hdf values for the currently proposed partition table.
"""
avail_size = self.blockdevice_size
i = 0
for part in parts:
self.cbox.log.debug(part)
self.hdf[self.hdf_prefix + "Parts.%d.Size" % i] = part["size"]
self.hdf[self.hdf_prefix + "Parts.%d.Type" % i] = part["type"]
avail_size -= part["size"]
i += 1
self.hdf[self.hdf_prefix + "availSize"] = avail_size
if self.with_config_partition:
self.hdf[self.hdf_prefix + "CreateConfigPartition"] = "1"
for ptype in PARTTYPES.keys():
self.hdf[self.hdf_prefix + "Types.%s" % ptype] = ptype
## store the currently existing partitions of the choosen block device
current_containers = [ blockdevice_tools.get_blockdevice(dev)
for dev in self.blockdevice.children
if blockdevice_tools.get_blockdevice(dev).is_storage() ]
for (index, cont) in enumerate(current_containers):
self.hdf[self.hdf_prefix + "ExistingContainers.%d" % index] = \
cont.name
def __get_partitions_from_args(self, args):
"""Filter the given arguments and construct a partition table.
"""
parts = []
done = False
avail_size = self.blockdevice_size
i = -1
while not done:
i += 1
try:
## skip every unconfirmed (probably the last) partition if we should not add it
if args.has_key("part%d_unconfirmed" % i) and \
not args.has_key("add_part"):
continue
size = int(args["part%d_size" % i])
part_type = args["part%d_type" % i]
if int(size) > avail_size:
self.hdf["Data.Warning"] = "Plugins.partition.PartitionTooBig"
continue
if int(size) < 10:
self.hdf["Data.Warning"] = "Plugins.partition.PartitionTooSmall"
continue
if not part_type in PARTTYPES.keys():
continue
parts.append({"size":size, "type":part_type})
avail_size -= size
except TypeError:
pass
except KeyError:
done = True
return parts
def __get_available_device_size(self, device):
"""calculate the available size (MB) of the device
also consider a (possible) configuration partition
"""
device_size = device.size
if self.with_config_partition:
device_size -= CONFIGPARTITION["size"]
if device_size < 0:
return 0
return device_size
def __is_with_config_partition(self):
"""check if we have to create a configuration partition
"""
if self.cbox.prefs.requires_partition():
active = self.cbox.prefs.get_active_partition()
## we need a partition, if there is no active one
if not active:
return True
## check if the active one is part of the current device
if [ dev for dev in self.blockdevice.children
if active in
blockdevice_tools.get_blockdevice(dev).devnodes ]:
return True
else:
return False
return False
def __run_fdisk(self, parts):
"""Call fdisk to partition the device.
"""
## check if the device is completely filled (to avoid some empty last blocks)
avail_size = self.blockdevice_size
for one_part in parts:
avail_size -= one_part["size"]
self.cbox.log.debug("remaining size: %d" % avail_size)
is_filled = avail_size == 0
proc = subprocess.Popen(
shell = False,
stdin = subprocess.PIPE,
stdout = subprocess.PIPE,
stderr = subprocess.PIPE,
args = [
self.cbox.prefs["Programs"]["super"],
self.cbox.prefs["Programs"]["CryptoBoxRootActions"],
"plugin",
os.path.join(self.plugin_dir, "root_action.py"),
"partition",
self.blockdevice.get_device()])
for line in self.__get_sfdisk_layout(parts, is_filled):
proc.stdin.write(line + "\n")
#TODO: if running inside of an uml, then sfdisk hangs at "nanosleep({3,0})"
# very ugly - maybe a uml bug?
# it seems, like this can be avoided by running uml with the param "aio=2.4"
(output, error) = proc.communicate()
fdisk_status = proc.returncode
if fdisk_status != 0:
self.cbox.log.debug("partitioning failed: %s" % error)
##Every time we update a partition table, force the kernel
##to reread it and update /proc/partitions. This particularly
##applies to internal hard disks.
rereadpt_proc = subprocess.Popen(
shell = False,
stdin = subprocess.PIPE,
stdout = subprocess.PIPE,
stderr = subprocess.PIPE,
args = [
self.cbox.prefs["Programs"]["super"],
self.cbox.prefs["Programs"]["CryptoBoxRootActions"],
"plugin",
os.path.join(self.plugin_dir, "root_action.py"),
"rereadpt",
self.blockdevice.get_device()])
(output, error) = rereadpt_proc.communicate()
rereadpt_status = rereadpt_proc.returncode
if rereadpt_status != 0:
self.cbox.log.info("failed to reread the modified partition table: %s" % error)
# refresh the device list
self.cbox.reread_container_list()
# update the blockdevice - especially the new partitioned children
self.blockdevice.reset()
return (fdisk_status == 0)
def __get_sfdisk_layout(self, param_parts, is_filled):
"""this generator returns the input lines for sfdisk
"""
parts = param_parts[:]
## first a (possible) configuration partition - so it will be reusable
if self.with_config_partition:
## fill the main table (including a config partition)
yield ",%d,%s" % (CONFIGPARTITION["size"], CONFIGPARTITION["type"])
## one primary partition
if is_filled and (len(parts) == 1):
## fill the rest of the device
yield ",,%s,*" % PARTTYPES[parts[0]["type"]][0]
else:
## only use the specified size
yield ",%d,%s,*" % (parts[0]["size"], PARTTYPES[parts[0]["type"]][0])
del parts[0]
## no extended partition, if there is only one disk
if not parts:
return
## an extended container for the rest
yield ",,E"
## an empty partition in main table
yield ";"
## maybe another empty partition if there is no config partition
if not self.with_config_partition:
yield ";"
while parts:
if is_filled and (len(parts) == 1):
yield ",,%s" % (PARTTYPES[parts[0]["type"]][0],)
else:
yield ",%d,%s" % (parts[0]["size"], PARTTYPES[parts[0]["type"]][0])
del parts[0]
def __format_partitions(self, param_parts):
"""Format all partitions of the device.
"""
parts = param_parts[:]
part_num = 1
## maybe a config partition?
if self.with_config_partition:
dev_name = self.__get_partition_device(self.blockdevice, part_num)
self.cbox.log.info("formatting config partition (%s)" % dev_name)
if self.__format_one_partition(dev_name, CONFIGPARTITION["fs"]):
self.__set_label_of_partition(dev_name,
self.cbox.prefs["Main"]["ConfigVolumeLabel"])
part_num += 1
## the first data partition
dev_name = self.__get_partition_device(self.blockdevice, part_num)
part_type = PARTTYPES[parts[0]["type"]][1]
self.cbox.log.info("formatting partition (%s) as '%s'" % (dev_name, part_type))
yield self.__format_one_partition(dev_name, part_type)
del parts[0]
## other data partitions
part_num += 1
while parts:
dev_name = self.__get_partition_device(self.blockdevice, part_num)
part_type = PARTTYPES[parts[0]["type"]][1]
self.cbox.log.info("formatting partition (%s) as '%s'" % \
(dev_name, part_type))
yield self.__format_one_partition(dev_name, part_type)
part_num += 1
del parts[0]
return
def __get_partition_device(self, blockdev, number):
"""Return the devicename of a specific partition of a device
No tests are performed, whether the partition exists or
not.
"""
valid_children = []
## filter the storage devices
for child in blockdev.children:
childdev = blockdevice_tools.get_blockdevice(child)
self.cbox.log.debug("Checking child device: %s - %s" % \
(blockdev, child))
if childdev and childdev.is_storage():
valid_children.append(childdev)
valid_children.sort()
self.cbox.log.debug("Valid children of %s: %s" % \
(blockdev, [child.name for child in valid_children]))
if number <= len(valid_children):
childdev = valid_children[number-1]
if childdev:
return childdev.get_device()
## return some guessed value - we should never get here ...
guess = "%s%d" % (blockdev.get_device(), number)
self.cbox.log.warn("Failed to get the partition name (%s, %d)" % \
(blockdev, number) + " - proceeding with guessed name: %s" % \
guess)
return guess
def __format_one_partition(self, dev_name, fs_type):
"""Format a single partition
"""
import cryptobox.core.container
## first: retrieve UUID - it can be removed from the database afterwards
prev_name = [e.get_name() for e in self.cbox.get_container_list()
if e.get_device() == dev_name]
## call "mkfs"
try:
format_dev = blockdevice_tools.get_blockdevice(dev_name)
if format_dev is None:
self.cbox.log.warn("Could not find the specified device: %s" % \
str(format_dev))
return False
else:
cont = cryptobox.core.container.CryptoBoxContainer(format_dev, self.cbox)
cont.create(cryptobox.core.container.CONTAINERTYPES["plain"], fs_type=fs_type)
except (CBInvalidType, CBCreateError, CBVolumeIsActive), err_msg:
self.cbox.log.warn(err_msg)
return False
## remove unused volume entry in case it exists
if prev_name and self.cbox.prefs.volumes_db.has_key(prev_name[0]):
del self.cbox.prefs.volumes_db[prev_name[0]]
return True
def __set_label_of_partition(self, dev_name, label):
"""Set the label of a partition - useful for the config partition.
"""
proc = subprocess.Popen(
shell = False,
stdout = subprocess.PIPE,
stderr = subprocess.PIPE,
args = [
self.cbox.prefs["Programs"]["super"],
self.cbox.prefs["Programs"]["CryptoBoxRootActions"],
"plugin",
os.path.join(self.plugin_dir, "root_action.py"),
"label",
dev_name,
label])
(output, error) = proc.communicate()
if proc.returncode == 0:
return True
else:
self.cbox.log.warn("failed to create filesystem on %s: %s" % (dev_name, error))
return False