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#!/usr/bin/python
# Copyright (C) 2009 Canonical Ltd.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3,
# as published by the Free Software Foundation.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
import dbus
import gobject
import dbus.service
import logging
import os
logging.basicConfig(level=logging.DEBUG)
from dbus.mainloop.glib import DBusGMainLoop
from usbcreator.misc import (
USBCreatorProcessException,
find_on_path,
popen,
sane_path,
)
USBCREATOR_IFACE = 'com.ubuntu.USBCreator'
PROPS_IFACE = 'org.freedesktop.DBus.Properties'
DEVICE_IFACE = 'org.freedesktop.UDisks.Device'
DISKS_IFACE = 'org.freedesktop.UDisks'
sane_path()
def unmount_all(parent):
'''Unmounts the device or any partitions of the device.'''
bus = dbus.SystemBus()
udisks = bus.get_object(DISKS_IFACE, '/org/freedesktop/UDisks')
devices = udisks.EnumerateDevices(dbus_interface=DISKS_IFACE)
for device in devices:
dev = bus.get_object(DISKS_IFACE, device)
props = dbus.Interface(dev, dbus.PROPERTIES_IFACE)
if (props.Get(device, 'partition-slave') == parent
and props.Get(device, 'device-is-mounted')):
logging.debug('Unmounting %s' % device)
# We explictly avoid catching errors here so that failure to
# unmount a partition causes the format method to fail with the
# error floating up to the frontend.
dev.FilesystemUnmount([], dbus_interface=DEVICE_IFACE)
dev = bus.get_object(DISKS_IFACE, parent)
iface = dbus.PROPERTIES_IFACE
if dev.Get(parent, 'device-is-mounted', dbus_interface=iface):
logging.debug('Unmounting %s' % parent)
dev.FilesystemUnmount([], dbus_interface=DEVICE_IFACE)
def check_system_internal(device):
bus = dbus.SystemBus()
udisks = bus.get_object(DISKS_IFACE,
'/org/freedesktop/UDisks')
udisks = dbus.Interface(udisks, DISKS_IFACE)
device = udisks.FindDeviceByDeviceFile(device)
deviceobj = bus.get_object(DISKS_IFACE, device)
if deviceobj.Get(device, 'device-is-system-internal', dbus_interface=PROPS_IFACE):
raise dbus.DBusException('com.ubuntu.USBCreator.Error.SystemInternal')
def mem_free():
# Largely copied from partman-base.
free = 0
with open('/proc/meminfo') as meminfo:
for line in meminfo:
if line.startswith('MemFree:'):
free += int(line.split()[1]) / 1024.0
if line.startswith('Buffers:'):
free += int(line.split()[1]) / 1024.0
return free
class USBCreator(dbus.service.Object):
def __init__(self):
bus_name = dbus.service.BusName(USBCREATOR_IFACE, bus=dbus.SystemBus())
dbus.service.Object.__init__(self, bus_name, '/com/ubuntu/USBCreator')
self.dbus_info = None
self.polkit = None
@dbus.service.method(USBCREATOR_IFACE, in_signature='', out_signature='b')
def KVMOk(self):
mem = mem_free()
logging.debug('Asked to run KVM with %f M free' % mem)
if mem >= 768 and find_on_path('kvm-ok') and find_on_path('kvm'):
import subprocess
if subprocess.call(['kvm-ok']) == 0:
return True
return False
@dbus.service.method(USBCREATOR_IFACE, in_signature='sa{ss}', out_signature='')
def KVMTest(self, device, env):
'''Run KVM with the freshly created device as the first disk.'''
for key in ('DISPLAY', 'XAUTHORITY'):
if key not in env:
logging.debug('Missing %s' % key)
return
bus = dbus.SystemBus()
dev = bus.get_object(DISKS_IFACE, device)
if dev.Get(device, 'device-is-partition', dbus_interface=PROPS_IFACE):
device = dev.Get(device, 'partition-slave', dbus_interface=PROPS_IFACE)
dev = bus.get_object(DISKS_IFACE, device)
# TODO unmount all the partitions.
dev_file = dev.Get(device, 'device-file', dbus_interface=PROPS_IFACE)
if mem_free() >= 768:
envp = []
for k, v in env.items():
envp.append('%s=%s' % (str(k), str(v)))
cmd = ('kvm', '-m', '512', '-hda', str(dev_file))
flags = (gobject.SPAWN_SEARCH_PATH)
# Don't let SIGINT propagate to the child.
gobject.spawn_async(cmd, envp=envp, flags=flags, child_setup=os.setsid)
@dbus.service.method(USBCREATOR_IFACE, in_signature='ss', out_signature='',
sender_keyword='sender', connection_keyword='conn')
def InstallEFI(self, target, efi_image, sender=None, conn=None):
'''Unpacks bootx64.efi from an image in the proper location that uEFI
firmware expects it'''
self.check_polkit(sender, conn, 'com.ubuntu.usbcreator.bootloader')
mount_point = self.MountISO(efi_image)
if not os.path.isdir(os.path.join(target, 'efi', 'boot')):
os.makedirs(os.path.join(target, 'efi', 'boot'))
#really small file, don't bother with fancy copy methods
with open(os.path.join(mount_point, 'efi', 'boot', 'bootx64.efi'), 'r') as rd:
with open(os.path.join(target, 'efi', 'boot', 'bootx64.efi'), 'w') as wd:
wd.write(rd.read())
self.UnmountFile(mount_point)
# TODO return boolean success
@dbus.service.method(USBCREATOR_IFACE, in_signature='sbsb', out_signature='',
sender_keyword='sender', connection_keyword='conn')
def InstallBootloader(self, device, allow_system_internal, grub_location,
syslinux_legacy, sender=None, conn=None):
'''Install a bootloader to the boot code area, either grub or syslinux.
The function takes a partition device file of the form /dev/sda1
and an option grub_location argument for where grub is located
For GRUB, it's expected that GRUB already exists, all that is
installed is the bootsector code from grub-setup.
For syslinux:
Installs syslinux to the partition boot code area and writes the
syslinux boot code to the disk code area. The latter is done to
handle cases where a bootloader is accidentally installed to the
MBR, and to handle some buggy BIOSes.'''
self.check_polkit(sender, conn, 'com.ubuntu.usbcreator.bootloader')
if not allow_system_internal:
check_system_internal(device)
bus = dbus.SystemBus()
device_file = device
udisks = bus.get_object(DISKS_IFACE,
'/org/freedesktop/UDisks')
udisks = dbus.Interface(udisks, DISKS_IFACE)
device = udisks.FindDeviceByDeviceFile(device)
deviceobj = bus.get_object(DISKS_IFACE, device)
# Find the parent of the partition.
parent = deviceobj.Get(device, 'partition-slave',
dbus_interface=PROPS_IFACE)
parentobj = bus.get_object(DISKS_IFACE, parent)
parent = parentobj.Get(parent, 'device-file',
dbus_interface=PROPS_IFACE)
if grub_location:
#Expect that boot.img and core.img both pre-built in grub_location
popen(['dd', 'if=%s' % os.path.join(grub_location, 'boot.img'), 'of=%s' % parent,
'bs=446', 'count=1', 'conv=sync'])
popen(['dd', 'if=%s' % os.path.join(grub_location, 'core.img'), 'of=%s' % parent,
'bs=512', 'count=62', 'seek=1', 'conv=sync'])
else:
if syslinux_legacy and find_on_path('syslinux-legacy'):
syslinux = 'syslinux-legacy'
else:
syslinux = 'syslinux'
popen([syslinux, '-f', device_file])
# Write the syslinux MBR.
popen(['dd', 'if=/usr/lib/%s/mbr.bin' % syslinux, 'of=%s' % parent,
'bs=446', 'count=1', 'conv=sync'])
num = deviceobj.Get(device, 'partition-number',
dbus_interface=PROPS_IFACE)
try:
popen(['/sbin/parted', parent, 'set', str(num), 'boot', 'on'])
except USBCreatorProcessException:
# Don't worry about not being able to re-read the partition table.
# TODO: As this will still be a problem for KVM users, this should
# be fixed by unmounting all the partitions before we get to this
# point, then remounting the target partition after.
pass
@dbus.service.method(USBCREATOR_IFACE, in_signature='sb', out_signature='',
sender_keyword='sender', connection_keyword='conn')
def Format(self, device, allow_system_internal, sender=None, conn=None):
self.check_polkit(sender, conn, 'com.ubuntu.usbcreator.format')
if not allow_system_internal:
check_system_internal(device)
# TODO evand 2009-08-25: Needs a confirmation dialog.
# XXX test with a device that doesn't have a partition table.
bus = dbus.SystemBus()
udisks = bus.get_object(DISKS_IFACE,
'/org/freedesktop/UDisks')
device = udisks.FindDeviceByDeviceFile(device, dbus_interface=DISKS_IFACE)
dev = bus.get_object(DISKS_IFACE, device)
# Use the disk if asked to format a partition.
if dev.Get(device, 'device-is-partition', dbus_interface=PROPS_IFACE):
device = dev.Get(device, 'partition-slave', dbus_interface=PROPS_IFACE)
dev = bus.get_object(DISKS_IFACE, device)
dev_file = dev.Get(device, 'device-file', dbus_interface=PROPS_IFACE)
# TODO LOCK
unmount_all(device)
size = dev.Get(device, 'device-size', dbus_interface=PROPS_IFACE)
dev.PartitionTableCreate('mbr', [], dbus_interface=DEVICE_IFACE, timeout=600)
dev.PartitionCreate(0, size, '0x0c', '', ['boot'], [], 'vfat', [],
dbus_interface=DEVICE_IFACE)
# Zero out the MBR. Will require fancy privileges.
popen(['dd', 'if=/dev/zero', 'of=%s' % dev_file, 'bs=446', 'count=1'])
# TODO UNLOCK
@dbus.service.method(USBCREATOR_IFACE, in_signature='ssb', out_signature='',
sender_keyword='sender', connection_keyword='conn')
def Image(self, source, target, allow_system_internal,
sender=None, conn=None):
self.check_polkit(sender, conn, 'com.ubuntu.usbcreator.image')
if not allow_system_internal:
check_system_internal(target)
cmd = ['dd', 'if=%s' % str(source), 'of=%s' % str(target), 'bs=1M']
popen(cmd)
@dbus.service.method(USBCREATOR_IFACE, in_signature='s', out_signature='s',
sender_keyword='sender', connection_keyword='conn')
def MountISO(self, device, sender=None, conn=None):
self.check_polkit(sender, conn, 'com.ubuntu.usbcreator.mount')
import tempfile
ret = tempfile.mkdtemp()
device = device.encode('utf-8')
popen(['mount', '-o', 'loop', device, ret])
return ret
@dbus.service.method(USBCREATOR_IFACE, in_signature='s', out_signature='',
sender_keyword='sender', connection_keyword='conn')
def UnmountFile(self, device, sender=None, conn=None):
self.check_polkit(sender, conn, 'com.ubuntu.usbcreator.mount')
popen(['umount', device])
@dbus.service.method(USBCREATOR_IFACE, in_signature='s', out_signature='',
sender_keyword='sender', connection_keyword='conn')
def Unmount(self, device, sender=None, conn=None):
self.check_polkit(sender, conn, 'com.ubuntu.usbcreator.mount')
unmount_all(device)
@dbus.service.method(USBCREATOR_IFACE, in_signature='s', out_signature='',
sender_keyword='sender', connection_keyword='conn')
def RemountRW(self, device, sender=None, conn=None):
# Until udisks supports remounting devices.
self.check_polkit(sender, conn, 'com.ubuntu.usbcreator.mount')
popen(['mount', '-o', 'remount,rw', device])
@dbus.service.method(USBCREATOR_IFACE, in_signature='', out_signature='',
sender_keyword='sender', connection_keyword='conn')
def Shutdown(self, sender=None, conn=None):
logging.debug('Shutting down.')
loop.quit()
# Taken from Jockey 0.5.3.
def check_polkit(self, sender, conn, priv):
if sender is None and conn is None:
return
if self.dbus_info is None:
self.dbus_info = dbus.Interface(conn.get_object(
'org.freedesktop.DBus',
'/org/freedesktop/DBus/Bus',
False), 'org.freedesktop.DBus')
pid = self.dbus_info.GetConnectionUnixProcessID(sender)
if self.polkit is None:
self.polkit = dbus.Interface(dbus.SystemBus().get_object(
'org.freedesktop.PolicyKit1',
'/org/freedesktop/PolicyKit1/Authority',
False), 'org.freedesktop.PolicyKit1.Authority')
try:
# we don't need is_challenge return here, since we call with
# AllowUserInteraction
(is_auth, _, details) = self.polkit.CheckAuthorization(
('unix-process', {'pid': dbus.UInt32(pid,
variant_level=1), 'start-time':
dbus.UInt64(0, variant_level=1)}), priv, {'': ''},
dbus.UInt32(1), '', timeout=600)
except dbus.DBusException as e:
if e._dbus_error_name == 'org.freedesktop.DBus.Error.ServiceUnknown':
# polkitd timed out, connect again
self.polkit = None
return self.check_polkit(sender, conn, priv)
else:
raise
if not is_auth:
logging.debug('_check_polkit_privilege: sender %s on connection %s '
'pid %i is not authorized for %s: %s' %
(sender, conn, pid, priv, str(details)))
raise dbus.DBusException('com.ubuntu.USBCreator.Error.NotAuthorized')
DBusGMainLoop(set_as_default=True)
helper = USBCreator()
loop = gobject.MainLoop()
loop.run()
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