VM Disk size

test.py

from bundle_volume import *

def _read_fstable(f):
    """Use this generator to iterate over the lines of and fstab file"""

    if not os.path.isfile(f):
        raise FatalError("Unable to open: `%s'. File is missing." % f)

    FileSystemTableEntry = namedtuple('FileSystemTableEntry',
                                      'dev mpoint fs opts freq passno')
    with open(f) as table:
        for line in iter(table):
            entry = line.split('#')[0].strip().split()
            if len(entry) != 6:
                continue
            yield FileSystemTableEntry(*entry)

for entry in _read_fstable('/etc/fstab'):
    if entry.mpoint =='/':
        root = entry.dev  #root = "UUID=53966d11-b4b3-480b-aeb5-3a121308d25b"

Partition = namedtuple('Partition', 'num start end type fs')
partitions = []
for p in disk.partitions:
  num = p.number
  start = p.geometry.start
  end = p.geometry.end
  ptype = p.type
  fs = p.fileSystem.type if p.fileSystem is not None else ''
  partitions.append(Partition(num, start, end, ptype, fs))

print partitions # [Partition(num=1, start=2048L, end=41940991L, type=0L, fs='ext4')]

root = findfs(root).stdout.strip() #root = '/dev/vda1'
disk_file = re.split('[0-9]', root)[0]
device = parted.Device(disk_file)
the_disk = parted.Disk(device)
size = the_disk.device.length * the_disk.device.sectorSize

print size, type(size)                        # 21474836480L
print free_space("/"), type(free_space("/"))  # 11291127808
print free_space("/") < size                  # True

stat = os.statvfs("/")
# 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) // 512  # self.disk.device.sectorSize

# Add 10% just to be on the safe side
part_end = last.start + (new_size * 11) // 10
# Align to 2048
part_end = ((part_end + 2047) // 2048) * 2048
size = (part_end + 1) * 512

print size, type(size)                        # 10830742016L
print free_space("/"), type(free_space("/"))  # 11291127808
print free_space("/") < size                  # False