# Copyright 2012 GRNET S.A. All rights reserved.
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import os
import re
import uuid
import tempfile
from collections import namedtuple
import parted
from image_creator.util import get_command
from image_creator.util import FatalError
findfs = get_command('findfs')
truncate = get_command('truncate')
dd = get_command('dd')
dmsetup = get_command('dmsetup')
class BundleVolume():
_FileSystemEntry = namedtuple('FileSystemEntry',
'dev mpoint fs opts freq passno')
_Partition = namedtuple('Partition', 'num start end type fs mopts')
def __init__(self, out, meta):
self.out = out
self.meta = meta
self.out.output('Searching for root device...', False)
root = self._get_root_partition()
if root.startswith("UUID=") or root.startswith("LABEL="):
self.root = findfs(root).stdout.strip()
else:
self.root = root
if not re.match('/dev/[hsv]d[a-z][1-9]*$', self.root):
raise FatalError("Don't know how to handle root device: %s" % \
self.root)
self.disk = re.split('[0-9]', self.root)[0]
out.success('%s' % root_dev)
def _read_fstable(f):
if not os.path.isfile(f):
raise FatalError("Unable to open: `%s'. File is missing." % f)
with open(f) as table:
for line in iter(table):
entry = line.split('#')[0].strip().split()
if len(entry) != 6:
continue
yield FileSystemEntry(*entry)
def _get_root_partition():
for entry in self._read_fstable('/etc/fstab'):
if entry.mpoint == '/':
return entry.dev
raise FatalError("Unable to find root device in /etc/fstab")
def _is_mpoint(path):
for entry in fstable('/proc/mounts'):
if entry.mpoint == path:
return True
return False
def _mount_options(device):
for entry in fstable('/proc/mounts'):
if not entry.dev.startswith('/'):
continue
if os.path.realpath(entry.dev) == os.path.realpath(device):
return entry
return
def _create_partition_table(src_disk, dest_file):
if src_disk.type != 'msdos':
raise FatalError('Only msdos partition tables are supported')
first_sector = src_disk.getPrimaryPartitions()[0].geometry.start
# 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 = src_disk.getPrimaryPartitions()[0].geometry.start
dd('if=%s' % src_disk.device.path, 'of=%s' % dest_file,
'bs=%d' % src_disk.device.sectorSize,
'count=%d' % first_sector, 'conv=notrunc')
# Create the Extended boot records (EBRs) in the image
extended = src_disk.getExtendedPartition()
if not extended:
return
# Extended boot records precede the logical partitions they describe
logical = src_disk.getLogicalPartitions()
start = extended.geometry.start
for i in range(len(logical)):
end = logical[i].geometry.start - 1
dd('if=%s' % src.device.path, 'of=%s' % dest,
'count=%d' % (end - start + 1), 'conv=notrunc',
'seek=%d' % start, 'skip=%d' % start)
start = logical[i].geometry.end + 1
def _shrink_partitions(src_disk, image_file):
partitions = []
new_end = 0
image_dev = parted.Device(image_file)
try:
image_disk = parted.Disk(image_dev)
try:
is_extended = lambda p: p.type == parted.PARTITION_EXTENDED
is_logical = lambda p: p.type == parted.PARTITION_LOGICAL
partitions = []
for p in src_disk.partitions:
g = p.geometry
f = p.fileSystem
partitions.append(self._Partition(p.number, g.start, g.end,
p.type, f.type if f is not None else '',
mount_options(p.path)))
last = partitions[-1]
new_end = src_disk.device.getLength()
if last.fs == 'linux-swap(v1)':
MB = 2 ** 20
size = (last.end - last.start + 1) * \
src_disk.device.sectorSize
meta['SWAP'] = "%d:%s" % (last.num, (size + MB - 1) // MB)
img_disk.deletePartition(
image_disk.getPartitionBySector(last.start))
img_disk.commit()
if is_logical(last) and last.num == 5:
extended = image_disk.getExtendedPartition()
image_disk.deletePartition(extended)
image_disk.commit()
partitions.remove(filter(is_extended, partitions)[0])
partitions.remove(last)
last = partitions[-1]
# Leave 2048 blocks at the end
new_end = last.end + 2048
if last.mpoint:
stat = os.statvfs(last.mpoint)
# Shrink the last partition. The new size should be the
# size of the occupied blocks
blcks = stat.f_blocks - stat.f_bavail
new_size = (blcks * stat.f_frsize) // src_dev.sectorSize
# Add 10% just to be on the safe side
part_end = last.start + (new_size * 11) // 10
# Alighn to 2048
part_end = ((part_end + 2047) // 2048) * 2048
last = last._replace(end=part_end)
partitions[-1] = last
# Leave 2048 blocks at the end.
new_end = new_size + 2048
image_disk.setPartitionGeometry(
image_disk.getPartitionBySector(last.start),
parted.Constraint(device=image_disk.device),
start=last.start, end=last.end)
image_disk.commit()
if last.type == parted.PARTITION_LOGICAL:
# Fix the extended partition
extended = disk.getExtendedPartition()
image_disk.setPartitionGeometry(extended,
parted.Constraint(device=img_dev),
ext.geometry.start, end=last.end)
image_disk.commit()
finally:
image_disk.destroy()
finally:
image_dev.destroy()
# Check if the available space is enough to host the image
location = os.path.dirname(image_file)
size = (new_end + 1) * src_disk.device.sectorSize
self.out.output("Examining available space in %s" % location, False)
stat = os.statvfs(location)
available = stat.f_bavail * stat.f_frsize
if available <= size:
raise FatalError('Not enough space in %s to host the image' % \
location)
out.success("sufficient")
return partitions
def _fill_partitions(src_disk, image, partitions):
pass
def create_image():
image_file = '/mnt/%s.diskdump' % uuid.uuid4().hex
src_dev = parted.Device(self.disk)
try:
size = src_dev.getLength() * src_dev.sectorSize
# Create sparse file to host the image
truncate("-s", "%d" % disk_size, image_file)
src_disk = parted.Disk(src_dev)
try:
self._create_partition_table(src_disk, image_file)
partitions = self._shrink_partitions(src_disk, image_file)
self.fill_partitions(src_disk, image_file, partitions)
finally:
src_disk.destroy()
finally:
src_dev.destroy()
return image_file
# unmounted = filter(lambda p: not p.mopts.mpoint, partitions)
# mounted = filter(lambda p: p.mopts.mpoint, partitions)
#
# for p in unmounted:
# dd('if=%s' % src_dev.path, 'of=%s' % img_dev.path,
# 'count=%d' % (p.end - p.start + 1), 'conv=notrunc',
# 'seek=%d' % p.start, 'skip=%d' % p.start)
#
# partition_devices = create_devices(dest, partitions)
#
# mounted.sort(key=lambda p: p.mopts.mpoint)
#
# return img
# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :