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# Copyright 2012 GRNET S.A. All rights reserved.
#
# Redistribution and use in source and binary forms, with or
# without modification, are permitted provided that the following
# conditions are met:
#
# 1. Redistributions of source code must retain the above
# copyright notice, this list of conditions and the following
# disclaimer.
#
# 2. Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials
# provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# The views and conclusions contained in the software and
# documentation are those of the authors and should not be
# interpreted as representing official policies, either expressed
# or implied, of GRNET S.A.
import os
import re
import parted
import uuid
from image_creator.util import get_command
from image_creator.util import FatalError
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findfs = get_command('findfs')
truncate = get_command('truncate')
dd = get_command('dd')
def get_root_partition():
if not os.path.isfile('/etc/fstab'):
raise FatalError("Unable to open `/etc/fstab'. File is missing.")
with open('/etc/fstab') as fstab:
for line in iter(fstab):
entry = line.split('#')[0].strip().split()
if len(entry) != 6:
continue
if entry[1] == "/":
return entry[0]
raise FatalError("Unable to find root device in /etc/fstab")
def mnt_mounted():
if not os.path.isfile('/etc/mtab'):
raise FatalError("Unable to open `/etc/fstab'. File is missing.")
with open('/etc/mtab') as mtab:
for line in iter(mtab):
entry = line.split('#')[0].strip().split()
if len(entry) != 6:
continue
if entry[1] == '/mnt':
return True
return False
def part_to_dev(part):
return re.split('[0-9]', part)[0]
def part_to_num(part):
return re.split('[^0-9]+', part)[-1]
def bundle_volume(out):
if mnt_mounted():
raise FatalError('The directory /mnt where the image will be hosted'
'is mounted. Please unmount it and start over again.')
out.output('Searching for root device...', False)
root_part = get_root_partition()
if root_part.startswith("UUID=") or root_part.startswith("LABEL="):
root_part = findfs(root_part)
elif not root_part.startswith("/"):
raise FatalError("Unable to find a block device for: %s" % root_dev)
if not re.match('/dev/[hsv]d[a-z][1-9]*$', root_part):
raise FatalError("Don't know how to handle root device: %s" % root_dev)
device = parted.Device(part_to_dev(root_part))
image = '/mnt/%s.diskdump' % uuid.uuid4().hex
# Create sparse file to host the image
truncate("-s", "%d" % (device.getLength() * device.sectorSize), image)
disk = parted.Disk(device)
if disk.type != 'msdos':
raise FatalError('For now we can only handle msdos partition tables')
# Copy the MBR and the space between the MBR and the first partition.
# In Grub version 1 Stage 1.5 is located there.
first_sector = disk.getPrimaryPartitions()[0].geometry.start
dd('if=%s' % device.path, 'of=%s' % image, 'bs=%d' % device.sectorSize,
'count=%d' % first_sector, 'conv=notrunc')
return image
# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :