from image_creator.util import get_command
from image_creator.util import warn, progress, success, output, FatalError
-
+from image_creator.gpt import GPTPartitionTable
import stat
import os
import tempfile
os.close(cowfd)
self._add_cleanup(os.unlink, cow)
# Create 1G cow sparse file
- dd('if=/dev/null', 'of=%s' % cow, 'bs=1k', \
- 'seek=%d' % (1024 * 1024))
+ dd('if=/dev/null', 'of=%s' % cow, 'bs=1k', 'seek=%d' % (1024 * 1024))
cowdev = self._losetup(cow)
snapshot = uuid.uuid4().hex
def __init__(self, device, bootable=True):
"""Create a new DiskDevice."""
- self.device = device
+ self.real_device = device
self.bootable = bootable
self.progress_bar = None
+ self.guestfs_device = None
+ self.meta = {}
self.g = guestfs.GuestFS()
- self.g.add_drive_opts(self.device, readonly=0)
+ self.g.add_drive_opts(self.real_device, readonly=0)
#self.g.set_trace(1)
#self.g.set_verbose(1)
raise FatalError("Multiple operating systems found."
"We only support images with one filesystem.")
self.root = roots[0]
+ self.guestfs_device = self.g.part_to_dev(self.root)
+ self.meta['SIZE'] = self.g.blockdev_getsize64(self.guestfs_device)
+ self.meta['PARTITION_TABLE'] = \
+ self.g.part_get_parttype(self.guestfs_device)
+
self.ostype = self.g.inspect_get_type(self.root)
self.distro = self.g.inspect_get_distro(self.root)
- success('found a %s system' % self.distro)
+ success('found a(n) %s system' % self.distro)
def destroy(self):
"""Destroy this DiskDevice instance."""
"""Umount all mounted filesystems."""
self.g.umount_all()
+ def _last_partition(self):
+ if self.meta['PARTITION_TABLE'] not in 'msdos' 'gpt':
+ msg = "Unsupported partition table: %s. Only msdos and gpt " \
+ "partition tables are supported" % self.meta['PARTITION_TABLE']
+ raise FatalError(msg)
+
+ is_extended = lambda p: self.g.part_get_mbr_id(
+ self.guestfs_device, p['part_num']) == 5
+ is_logical = lambda p: self.meta['PARTITION_TABLE'] != 'msdos' and \
+ p['part_num'] > 4
+
+ partitions = self.g.part_list(self.guestfs_device)
+ last_partition = partitions[-1]
+
+ if is_logical(last_partition):
+ # The disk contains extended and logical partitions....
+ extended = [p for p in partitions if is_extended(p)][0]
+ last_primary = [p for p in partitions if p['part_num'] <= 4][-1]
+
+ # check if extended is the last primary partition
+ if last_primary['part_num'] > extended['part_num']:
+ last_partition = last_primary
+
+ return last_partition
+
def shrink(self):
"""Shrink the disk.
This is accomplished by shrinking the last filesystem in the
disk and then updating the partition table. The new disk size
(in bytes) is returned.
- """
- output("Shrinking image (this may take a while)...", False)
- dev = self.g.part_to_dev(self.root)
- parttype = self.g.part_get_parttype(dev)
- if parttype != 'msdos':
- raise FatalError("You have a %s partition table. "
- "Only msdos partitions are supported" % parttype)
-
- last_partition = self.g.part_list(dev)[-1]
-
- if last_partition['part_num'] > 4:
- raise FatalError("This disk contains logical partitions. "
- "Only primary partitions are supported.")
+ ATTENTION: make sure unmount is called before shrink
+ """
+ get_fstype = lambda p: self.g.vfs_type("%s%d" % \
+ (self.guestfs_device, p['part_num']))
+ is_logical = lambda p: self.meta['PARTITION_TABLE'] == 'msdos' and \
+ p['part_num'] > 4
+ is_extended = lambda p: self.meta['PARTITION_TABLE'] == 'msdos' and \
+ self.g.part_get_mbr_id(self.guestfs_device, p['part_num']) == 5
+
+ part_add = lambda ptype, start, stop: \
+ self.g.part_add(self.guestfs_device, ptype, start, stop)
+ part_del = lambda p: self.g.part_del(self.guestfs_device, p)
+ part_get_id = lambda p: self.g.part_get_mbr_id(self.guestfs_device, p)
+ part_set_id = lambda p, id: self.g.part_set_mbr_id(
+ self.guestfs_device, p, id)
+ part_get_bootable = lambda p: self.g.part_get_bootable(
+ self.guestfs_device, p)
+ part_set_bootable = lambda p, bootable: self.g.part_set_bootable(
+ self.guestfs_device, p, bootable)
+
+ MB = 2 ** 20
- part_dev = "%s%d" % (dev, last_partition['part_num'])
- fs_type = self.g.vfs_type(part_dev)
- if not re.match("ext[234]", fs_type):
- warn("Don't know how to resize %s partitions." % vfs_type)
- return
+ output("Shrinking image (this may take a while)...", False)
+ last_part = None
+ fstype = None
+ while True:
+ last_part = self._last_partition()
+ fstype = get_fstype(last_part)
+
+ if fstype == 'swap':
+ self.meta['SWAP'] = "%d:%s" % \
+ (last_part['part_num'],
+ (last_part['part_size'] + MB - 1) // MB)
+ part_del(last_part['part_num'])
+ continue
+ elif is_extended(last_part):
+ part_del(last_part['part_num'])
+ continue
+
+ self.meta['SIZE'] = last_part['part_end'] + 1
+ break
+
+ if not re.match("ext[234]", fstype):
+ warn("Don't know how to resize %s partitions." % fstype)
+ return self.meta['SIZE']
+
+ part_dev = "%s%d" % (self.guestfs_device, last_part['part_num'])
self.g.e2fsck_f(part_dev)
self.g.resize2fs_M(part_dev)
block_cnt = int(
filter(lambda x: x[0] == 'Block count', out)[0][1])
- sector_size = self.g.blockdev_getss(dev)
-
- start = last_partition['part_start'] / sector_size
+ sector_size = self.g.blockdev_getss(self.guestfs_device)
+ start = last_part['part_start'] / sector_size
end = start + (block_size * block_cnt) / sector_size - 1
- self.g.part_del(dev, last_partition['part_num'])
- self.g.part_add(dev, 'p', start, end)
+ if is_logical(last_part):
+ partitions = self.g.part_list(self.guestfs_device)
+
+ logical = [] # logical partitions
+ for partition in partitions:
+ if partition['part_num'] < 4:
+ continue
+ logical.append({
+ 'num': partition['part_num'],
+ 'start': partition['part_start'] / sector_size,
+ 'end': partition['part_end'] / sector_size,
+ 'id': part_get_(partition['part_num']),
+ 'bootable': part_get_bootable(partition['part_num'])
+ })
+
+ logical[-1]['end'] = end # new end after resize
+
+ # Recreate the extended partition
+ extended = [p for p in partitions if self._is_extended(p)][0]
+ part_del(extended['part_num'])
+ part_add('e', extended['part_start'], end)
+
+ # Create all the logical partitions back
+ for l in logical:
+ part_add('l', l['start'], l['end'])
+ part_set_id(l['num'], l['id'])
+ part_set_bootable(l['num'], l['bootable'])
+ else:
+ # Recreate the last partition
+ if self.meta['PARTITION_TABLE'] == 'msdos':
+ last_part['id'] = part_get_id(last_part['part_num'])
- new_size = (end + 1) * sector_size
- success("new image size is %dMB" %
- ((new_size + 2 ** 20 - 1) // 2 ** 20))
- return new_size
+ last_part['bootable'] = part_get_bootable(last_part['part_num'])
+ part_del(last_part['part_num'])
+ part_add('p', start, end)
+ part_set_bootable(last_part['part_num'], last_part['bootable'])
- def size(self):
- """Returns the "payload" size of the device.
+ if self.meta['PARTITION_TABLE'] == 'msdos':
+ part_set_id(last_part['part_num'], last_part['id'])
- The size returned by this method is the size of the space occupied by
- the partitions (including the space before the first partition).
- """
- dev = self.g.part_to_dev(self.root)
- last = self.g.part_list(dev)[-1]
+ new_size = (end + 1) * sector_size
+ success("new size is %dMB" % ((new_size + MB - 1) // MB))
- return last['part_end'] + 1
+ if self.meta['PARTITION_TABLE'] == 'gpt':
+ ptable = GPTPartitionTable(self.real_device)
+ self.meta['SIZE'] = ptable.shrink(new_size)
+ else:
+ self.meta['SIZE'] = new_size
+
+ return self.meta['SIZE']
def dump(self, outfile):
"""Dumps the content of device into a file.
This method will only dump the actual payload, found by reading the
partition table. Empty space in the end of the device will be ignored.
"""
- blocksize = 2 ** 22 # 4MB
- size = self.size()
- progress_size = (size + 2 ** 20 - 1) // 2 ** 20 # in MB
+ MB = 2 ** 20
+ blocksize = 4 * MB # 4MB
+ size = self.meta['SIZE']
+ progress_size = (size + MB - 1) // MB # in MB
progressbar = progress("Dumping image file: ", 'mb')
progressbar.max = progress_size
- source = open(self.device, "r")
- try:
- dest = open(outfile, "w")
- try:
+
+ with open(self.real_device, 'r') as src:
+ with open(outfile, "w") as dst:
left = size
offset = 0
progressbar.next()
while left > 0:
length = min(left, blocksize)
- sent = sendfile(dest.fileno(), source.fileno(), offset,
- length)
+ sent = sendfile(dst.fileno(), src.fileno(), offset, length)
offset += sent
left -= sent
- progressbar.goto((size - left) // 2 ** 20)
- finally:
- dest.close()
- finally:
- source.close()
-
+ progressbar.goto((size - left) // MB)
output("\rDumping image file...\033[K", False)
success('image file %s was successfully created' % outfile)
projects / snf-image-creator / blobdiff