import os
import re
-import uuid
import tempfile
-import time
from collections import namedtuple
import parted
from image_creator.rsync import Rsync
from image_creator.util import get_command
from image_creator.util import FatalError
+from image_creator.util import try_fail_repeat
findfs = get_command('findfs')
-truncate = get_command('truncate')
dd = get_command('dd')
dmsetup = get_command('dmsetup')
losetup = get_command('losetup')
mount = get_command('mount')
umount = get_command('umount')
+blkid = get_command('blkid')
MKFS_OPTS = {
'ext2': ['-F'],
}
-class BundleVolume():
+class BundleVolume(object):
+ """This class can be used to create an image out of the running system"""
def __init__(self, out, meta):
+ """Create an instance of the BundleVolume class."""
self.out = out
self.meta = meta
image_disk.setPartitionGeometry(
image_disk.getPartitionBySector(last.start),
parted.Constraint(device=image_disk.device),
- start=last.start, end=last.end)
+ start=last.start, end=part_end)
image_disk.commit()
# Parted may have changed this for better alignment
partitions[-1] = last
# Leave 2048 blocks at the end.
- new_end = new_size + 2048
+ new_end = part_end + 2048
if last.type == parted.PARTITION_LOGICAL:
# Fix the extended partition
ext.geometry.start, end=last.end)
image_disk.commit()
+ image_dev.destroy()
return new_end
def _map_partition(self, dev, num, start, end):
if not os.path.exists(dev):
return
- dmsetup('remove', dev.split('/dev/mapper/')[1])
- time.sleep(0.1)
+ try_fail_repeat(dmsetup, 'remove', dev.split('/dev/mapper/')[1])
def _mount(self, target, devs):
mpoints.sort()
for mpoint in reversed(mpoints):
- umount(mpoint)
+ try_fail_repeat(umount, mpoint)
def _to_exclude(self):
- excluded = ['/tmp']
+ excluded = ['/tmp', '/var/tmp']
local_filesystems = MKFS_OPTS.keys() + ['rootfs']
for entry in self._read_fstable('/proc/mounts'):
if entry.fs in local_filesystems:
return map(lambda d: d + "/*", excluded)
+ def _replace_uuids(self, target, new_uuid):
+
+ files = ['/etc/fstab',
+ '/boot/grub/grub.cfg',
+ '/boot/grub/menu.lst',
+ '/boot/grub/grub.conf']
+
+ orig = dict(map(lambda p: (p.number, blkid('-s', 'UUID', '-o',
+ 'value', p.path).stdout.strip()), self.disk.partitions))
+
+ for f in map(lambda f: target + f, files):
+
+ if not os.path.exists(f):
+ continue
+
+ with open(f, 'r') as src:
+ lines = src.readlines()
+ with open(f, 'w') as dest:
+ for line in lines:
+ for i, uuid in new_uuid.items():
+ line = re.sub(orig[i], uuid, line)
+ dest.write(line)
+
def _create_filesystems(self, image):
- partitions = self._get_partitions(parted.Disk(parted.Device(image)))
- filesystems = {}
+ filesystem = {}
for p in self.disk.partitions:
- filesystems[p.number] = self._get_mount_options(p.path)
+ filesystem[p.number] = self._get_mount_options(p.path)
- unmounted = filter(lambda p: filesystems[p.num] is None, partitions)
- mounted = filter(lambda p: filesystems[p.num] is not None, partitions)
+ partitions = self._get_partitions(parted.Disk(parted.Device(image)))
+ unmounted = filter(lambda p: filesystem[p.num] is None, partitions)
+ mounted = filter(lambda p: filesystem[p.num] is not None, partitions)
# For partitions that are not mounted right now, we can simply dd them
# into the image.
i = p.num
mapped[i] = self._map_partition(loop, i, p.start, p.end)
+ new_uuid = {}
# Create the file systems
for i, dev in mapped.iteritems():
- fs = filesystems[i].fs
+ fs = filesystem[i].fs
self.out.output('Creating %s filesystem on partition %d ... ' %
(fs, i), False)
get_command('mkfs.%s' % fs)(*(MKFS_OPTS[fs] + [dev]))
self.out.success('done')
+ new_uuid[i] = blkid('-s', 'UUID', '-o', 'value', dev
+ ).stdout.strip()
target = tempfile.mkdtemp()
try:
absmpoints = self._mount(target,
- [(mapped[i], filesystems[i].mpoint) for i in mapped.keys()]
+ [(mapped[i], filesystem[i].mpoint) for i in mapped.keys()]
)
exclude = self._to_exclude() + [image]
rsync = Rsync('/', target,
msg = "Copying host files into the image"
rsync.archive().run(self.out, msg)
+ self._replace_uuids(target, new_uuid)
+
finally:
self._umount_all(target)
os.rmdir(target)
self._unmap_partition(dev)
losetup('-d', loop)
- def create_image(self):
-
- image = '/mnt/%s.diskdump' % uuid.uuid4().hex
+ def create_image(self, image):
+ """Given an image filename, this method will create an image out of the
+ running system.
+ """
- disk_size = self.disk.device.getLength() * self.disk.device.sectorSize
+ size = self.disk.device.getLength() * self.disk.device.sectorSize
# Create sparse file to host the image
- truncate("-s", "%d" % disk_size, image)
+ fd = os.open(image, os.O_WRONLY | os.O_CREAT)
+ try:
+ os.ftruncate(fd, size)
+ finally:
+ os.close(fd)
self._create_partition_table(image)
+
end_sector = self._shrink_partitions(image)
# Check if the available space is enough to host the image
self._create_filesystems(image)
+ # Truncate image to the new size. I counldn't find a better way to do
+ # this. It seems that python's high level functions work in a different
+ # way.
+ fd = os.open(image, os.O_RDWR)
+ try:
+ os.ftruncate(fd, size)
+ finally:
+ os.close(fd)
+
return image
# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :
projects / snf-image-creator / blobdiff