/usr/lib/python3/dist-packages/os_win/utils/storage/virtdisk/vhdutils.py is in python3-os-win 3.0.0-0ubuntu1.
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# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Utility class for VHD related operations.
Official VHD format specs can be retrieved at:
http://technet.microsoft.com/en-us/library/bb676673.aspx
See "Download the Specifications Without Registering"
Official VHDX format specs can be retrieved at:
http://www.microsoft.com/en-us/download/details.aspx?id=34750
"""
import ctypes
import os
import struct
from oslo_log import log as logging
from oslo_utils import units
from os_win._i18n import _
from os_win import constants
from os_win import exceptions
from os_win.utils import win32utils
from os_win.utils.winapi import constants as w_const
from os_win.utils.winapi import libs as w_lib
from os_win.utils.winapi.libs import virtdisk as vdisk_struct
from os_win.utils.winapi import wintypes
kernel32 = w_lib.get_shared_lib_handle(w_lib.KERNEL32)
virtdisk = w_lib.get_shared_lib_handle(w_lib.VIRTDISK)
LOG = logging.getLogger(__name__)
VHD_SIGNATURE = b'conectix'
VHDX_SIGNATURE = b'vhdxfile'
DEVICE_ID_MAP = {
constants.DISK_FORMAT_VHD: w_const.VIRTUAL_STORAGE_TYPE_DEVICE_VHD,
constants.DISK_FORMAT_VHDX: w_const.VIRTUAL_STORAGE_TYPE_DEVICE_VHDX,
}
VHD_HEADER_SIZE_FIX = 512
VHD_BAT_ENTRY_SIZE = 4
VHD_DYNAMIC_DISK_HEADER_SIZE = 1024
VHD_HEADER_SIZE_DYNAMIC = 512
VHD_FOOTER_SIZE_DYNAMIC = 512
VHDX_BAT_ENTRY_SIZE = 8
VHDX_HEADER_OFFSETS = [64 * units.Ki, 128 * units.Ki]
VHDX_HEADER_SECTION_SIZE = units.Mi
VHDX_LOG_LENGTH_OFFSET = 68
VHDX_METADATA_SIZE_OFFSET = 64
VHDX_REGION_TABLE_OFFSET = 192 * units.Ki
VHDX_BS_METADATA_ENTRY_OFFSET = 48
VIRTUAL_DISK_DEFAULT_SECTOR_SIZE = 0x200
VIRTUAL_DISK_DEFAULT_PHYS_SECTOR_SIZE = 0x200
CREATE_VIRTUAL_DISK_FLAGS = {
constants.VHD_TYPE_FIXED:
w_const.CREATE_VIRTUAL_DISK_FLAG_FULL_PHYSICAL_ALLOCATION,
}
class VHDUtils(object):
def __init__(self):
self._win32_utils = win32utils.Win32Utils()
self._vhd_info_members = {
w_const.GET_VIRTUAL_DISK_INFO_SIZE: 'Size',
w_const.GET_VIRTUAL_DISK_INFO_PARENT_LOCATION:
'ParentLocation',
w_const.GET_VIRTUAL_DISK_INFO_VIRTUAL_STORAGE_TYPE:
'VirtualStorageType',
w_const.GET_VIRTUAL_DISK_INFO_PROVIDER_SUBTYPE:
'ProviderSubtype'}
# Describes the way error handling is performed
# for virtdisk.dll functions.
self._virtdisk_run_args = dict(
failure_exc=exceptions.VHDWin32APIException,
error_on_nonzero_ret_val=True,
ret_val_is_err_code=True)
def _run_and_check_output(self, *args, **kwargs):
cleanup_handle = kwargs.pop('cleanup_handle', None)
kwargs.update(self._virtdisk_run_args)
try:
return self._win32_utils.run_and_check_output(*args, **kwargs)
finally:
if cleanup_handle:
self._win32_utils.close_handle(cleanup_handle)
def _open(self, vhd_path,
open_flag=0,
open_access_mask=w_const.VIRTUAL_DISK_ACCESS_ALL,
open_params=None):
device_id = self._get_vhd_device_id(vhd_path)
vst = vdisk_struct.VIRTUAL_STORAGE_TYPE(
DeviceId=device_id,
VendorId=w_const.VIRTUAL_STORAGE_TYPE_VENDOR_MICROSOFT)
handle = wintypes.HANDLE()
self._run_and_check_output(virtdisk.OpenVirtualDisk,
ctypes.byref(vst),
ctypes.c_wchar_p(vhd_path),
open_access_mask,
open_flag,
open_params,
ctypes.byref(handle))
return handle
def close(self, handle):
self._win32_utils.close_handle(handle)
def create_vhd(self, new_vhd_path, new_vhd_type, src_path=None,
max_internal_size=0, parent_path=None):
new_device_id = self._get_vhd_device_id(new_vhd_path)
vst = vdisk_struct.VIRTUAL_STORAGE_TYPE(
DeviceId=new_device_id,
VendorId=w_const.VIRTUAL_STORAGE_TYPE_VENDOR_MICROSOFT)
params = vdisk_struct.CREATE_VIRTUAL_DISK_PARAMETERS()
params.Version = w_const.CREATE_VIRTUAL_DISK_VERSION_2
params.Version2.MaximumSize = max_internal_size
params.Version2.ParentPath = parent_path
params.Version2.SourcePath = src_path
params.Version2.PhysicalSectorSizeInBytes = (
VIRTUAL_DISK_DEFAULT_PHYS_SECTOR_SIZE)
params.Version2.BlockSizeInBytes = (
w_const.CREATE_VHD_PARAMS_DEFAULT_BLOCK_SIZE)
params.Version2.SectorSizeInBytes = (
VIRTUAL_DISK_DEFAULT_SECTOR_SIZE)
handle = wintypes.HANDLE()
create_virtual_disk_flag = CREATE_VIRTUAL_DISK_FLAGS.get(
new_vhd_type, 0)
self._run_and_check_output(virtdisk.CreateVirtualDisk,
ctypes.byref(vst),
ctypes.c_wchar_p(new_vhd_path),
0,
None,
create_virtual_disk_flag,
0,
ctypes.byref(params),
None,
ctypes.byref(handle),
cleanup_handle=handle)
def create_dynamic_vhd(self, path, max_internal_size):
self.create_vhd(path,
constants.VHD_TYPE_DYNAMIC,
max_internal_size=max_internal_size)
def create_differencing_vhd(self, path, parent_path):
self.create_vhd(path,
constants.VHD_TYPE_DIFFERENCING,
parent_path=parent_path)
def convert_vhd(self, src, dest,
vhd_type=constants.VHD_TYPE_DYNAMIC):
self.create_vhd(dest, vhd_type, src_path=src)
def get_vhd_format(self, vhd_path):
vhd_format = os.path.splitext(vhd_path)[1][1:].upper()
device_id = DEVICE_ID_MAP.get(vhd_format)
# If the disk format is not recognised by extension,
# we attempt to retrieve it by seeking the signature.
if not device_id and os.path.exists(vhd_path):
vhd_format = self._get_vhd_format_by_signature(vhd_path)
if not vhd_format:
raise exceptions.VHDException(
_("Could not retrieve VHD format: %s") % vhd_path)
return vhd_format
def _get_vhd_device_id(self, vhd_path):
vhd_format = self.get_vhd_format(vhd_path)
return DEVICE_ID_MAP.get(vhd_format)
def _get_vhd_format_by_signature(self, vhd_path):
with open(vhd_path, 'rb') as f:
# print f.read()
# Read header
if f.read(8) == VHDX_SIGNATURE:
return constants.DISK_FORMAT_VHDX
# Read footer
f.seek(0, 2)
file_size = f.tell()
if file_size >= 512:
f.seek(-512, 2)
if f.read(8) == VHD_SIGNATURE:
return constants.DISK_FORMAT_VHD
def get_vhd_info(self, vhd_path, info_members=None,
open_parents=False):
"""Returns a dict containing VHD image information.
:param info_members: A list of information members to be retrieved.
Default retrieved members and according dict keys:
GET_VIRTUAL_DISK_INFO_SIZE: 1
- VirtualSize
- PhysicalSize
- BlockSize
- SectorSize
GET_VIRTUAL_DISK_INFO_PARENT_LOCATION: 3
- ParentResolved
- ParentPath (ParentLocationBuffer)
GET_VIRTUAL_DISK_INFO_VIRTUAL_STORAGE_TYPE: 6
- DeviceId (format)
- VendorId
GET_VIRTUAL_DISK_INFO_PROVIDER_SUBTYPE:
- ProviderSubtype
"""
vhd_info = {}
info_members = info_members or self._vhd_info_members
open_flag = (w_const.OPEN_VIRTUAL_DISK_FLAG_NO_PARENTS
if not open_parents else 0)
open_access_mask = (w_const.VIRTUAL_DISK_ACCESS_GET_INFO |
w_const.VIRTUAL_DISK_ACCESS_DETACH)
handle = self._open(
vhd_path,
open_flag=open_flag,
open_access_mask=open_access_mask)
try:
for member in info_members:
info = self._get_vhd_info_member(handle, member)
vhd_info.update(info)
finally:
self._win32_utils.close_handle(handle)
return vhd_info
def _get_vhd_info_member(self, vhd_file, info_member):
virt_disk_info = vdisk_struct.GET_VIRTUAL_DISK_INFO()
virt_disk_info.Version = ctypes.c_uint(info_member)
infoSize = ctypes.sizeof(virt_disk_info)
virtdisk.GetVirtualDiskInformation.restype = wintypes.DWORD
# Note(lpetrut): If the vhd has no parent image, this will
# return an error. No need to raise an exception in this case.
ignored_error_codes = []
if info_member == w_const.GET_VIRTUAL_DISK_INFO_PARENT_LOCATION:
ignored_error_codes.append(w_const.ERROR_VHD_INVALID_TYPE)
self._run_and_check_output(virtdisk.GetVirtualDiskInformation,
vhd_file,
ctypes.byref(ctypes.c_ulong(infoSize)),
ctypes.byref(virt_disk_info),
None,
ignored_error_codes=ignored_error_codes)
return self._parse_vhd_info(virt_disk_info, info_member)
def _parse_vhd_info(self, virt_disk_info, info_member):
vhd_info = {}
vhd_info_member = self._vhd_info_members[info_member]
info = getattr(virt_disk_info, vhd_info_member)
if hasattr(info, '_fields_'):
for field in info._fields_:
vhd_info[field[0]] = getattr(info, field[0])
else:
vhd_info[vhd_info_member] = info
return vhd_info
def get_vhd_size(self, vhd_path):
"""Return vhd size.
Returns a dict containing the virtual size, physical size,
block size and sector size of the vhd.
"""
size = self.get_vhd_info(vhd_path,
[w_const.GET_VIRTUAL_DISK_INFO_SIZE])
return size
def get_vhd_parent_path(self, vhd_path):
vhd_info = self.get_vhd_info(
vhd_path,
[w_const.GET_VIRTUAL_DISK_INFO_PARENT_LOCATION])
parent_path = vhd_info['ParentPath']
return parent_path if parent_path else None
def get_vhd_type(self, vhd_path):
vhd_info = self.get_vhd_info(
vhd_path,
[w_const.GET_VIRTUAL_DISK_INFO_PROVIDER_SUBTYPE])
return vhd_info['ProviderSubtype']
def merge_vhd(self, vhd_path, delete_merged_image=True):
"""Merges a VHD/x image into the immediate next parent image."""
open_params = vdisk_struct.OPEN_VIRTUAL_DISK_PARAMETERS()
open_params.Version = w_const.OPEN_VIRTUAL_DISK_VERSION_1
open_params.Version1.RWDepth = 2
handle = self._open(vhd_path,
open_params=ctypes.byref(open_params))
params = vdisk_struct.MERGE_VIRTUAL_DISK_PARAMETERS()
params.Version = w_const.MERGE_VIRTUAL_DISK_VERSION_1
params.Version1.MergeDepth = 1
self._run_and_check_output(
virtdisk.MergeVirtualDisk,
handle,
0,
ctypes.byref(params),
None,
cleanup_handle=handle)
if delete_merged_image:
os.remove(vhd_path)
def reconnect_parent_vhd(self, child_path, parent_path):
open_params = vdisk_struct.OPEN_VIRTUAL_DISK_PARAMETERS()
open_params.Version = w_const.OPEN_VIRTUAL_DISK_VERSION_2
open_params.Version2.GetInfoOnly = False
handle = self._open(
child_path,
open_flag=w_const.OPEN_VIRTUAL_DISK_FLAG_NO_PARENTS,
open_access_mask=0,
open_params=ctypes.byref(open_params))
params = vdisk_struct.SET_VIRTUAL_DISK_INFO()
params.Version = w_const.SET_VIRTUAL_DISK_INFO_PARENT_PATH
params.ParentFilePath = parent_path
self._run_and_check_output(virtdisk.SetVirtualDiskInformation,
handle,
ctypes.byref(params),
cleanup_handle=handle)
def resize_vhd(self, vhd_path, new_max_size, is_file_max_size=True,
validate_new_size=True):
if is_file_max_size:
new_internal_max_size = self.get_internal_vhd_size_by_file_size(
vhd_path, new_max_size)
else:
new_internal_max_size = new_max_size
if validate_new_size:
if not self._check_resize_needed(vhd_path, new_internal_max_size):
return
self._resize_vhd(vhd_path, new_internal_max_size)
def _check_resize_needed(self, vhd_path, new_size):
curr_size = self.get_vhd_size(vhd_path)['VirtualSize']
if curr_size > new_size:
err_msg = _("Cannot resize image %(vhd_path)s "
"to a smaller size. "
"Image virtual size: %(curr_size)s, "
"Requested virtual size: %(new_size)s")
raise exceptions.VHDException(
err_msg % dict(vhd_path=vhd_path,
curr_size=curr_size,
new_size=new_size))
elif curr_size == new_size:
LOG.debug("Skipping resizing %(vhd_path)s to %(new_size)s"
"as it already has the requested size.",
dict(vhd_path=vhd_path,
new_size=new_size))
return False
return True
def _resize_vhd(self, vhd_path, new_max_size):
handle = self._open(vhd_path)
params = vdisk_struct.RESIZE_VIRTUAL_DISK_PARAMETERS()
params.Version = w_const.RESIZE_VIRTUAL_DISK_VERSION_1
params.Version1.NewSize = new_max_size
self._run_and_check_output(
virtdisk.ResizeVirtualDisk,
handle,
0,
ctypes.byref(params),
None,
cleanup_handle=handle)
def get_internal_vhd_size_by_file_size(self, vhd_path,
new_vhd_file_size):
"""Get internal size of a VHD according to new VHD file size."""
vhd_info = self.get_vhd_info(vhd_path)
vhd_type = vhd_info['ProviderSubtype']
vhd_dev_id = vhd_info['DeviceId']
if vhd_type == constants.VHD_TYPE_DIFFERENCING:
vhd_parent = vhd_info['ParentPath']
return self.get_internal_vhd_size_by_file_size(
vhd_parent, new_vhd_file_size)
if vhd_dev_id == w_const.VIRTUAL_STORAGE_TYPE_DEVICE_VHD:
func = self._get_internal_vhd_size_by_file_size
else:
func = self._get_internal_vhdx_size_by_file_size
return func(vhd_path, new_vhd_file_size, vhd_info)
def _get_internal_vhd_size_by_file_size(self, vhd_path,
new_vhd_file_size,
vhd_info):
"""Fixed VHD size = Data Block size + 512 bytes
| Dynamic_VHD_size = Dynamic Disk Header
| + Copy of hard disk footer
| + Hard Disk Footer
| + Data Block
| + BAT
| Dynamic Disk header fields
| Copy of hard disk footer (512 bytes)
| Dynamic Disk Header (1024 bytes)
| BAT (Block Allocation table)
| Data Block 1
| Data Block 2
| Data Block n
| Hard Disk Footer (512 bytes)
| Default block size is 2M
| BAT entry size is 4byte
"""
vhd_type = vhd_info['ProviderSubtype']
if vhd_type == constants.VHD_TYPE_FIXED:
vhd_header_size = VHD_HEADER_SIZE_FIX
return new_vhd_file_size - vhd_header_size
else:
bs = vhd_info['BlockSize']
bes = VHD_BAT_ENTRY_SIZE
ddhs = VHD_DYNAMIC_DISK_HEADER_SIZE
hs = VHD_HEADER_SIZE_DYNAMIC
fs = VHD_FOOTER_SIZE_DYNAMIC
max_internal_size = (new_vhd_file_size -
(hs + ddhs + fs)) * bs // (bes + bs)
return max_internal_size
def _get_internal_vhdx_size_by_file_size(self, vhd_path,
new_vhd_file_size,
vhd_info):
"""VHDX Size:
Header (1MB) + Log + Metadata Region + BAT + Payload Blocks
The chunk size is the maximum number of bytes described by a SB
block.
Chunk size = 2^{23} * SectorSize
:param str vhd_path: VHD file path
:param new_vhd_file_size: Size of the new VHD file.
:return: Internal VHD size according to new VHD file size.
"""
try:
with open(vhd_path, 'rb') as f:
hs = VHDX_HEADER_SECTION_SIZE
bes = VHDX_BAT_ENTRY_SIZE
lss = vhd_info['SectorSize']
bs = self._get_vhdx_block_size(f)
ls = self._get_vhdx_log_size(f)
ms = self._get_vhdx_metadata_size_and_offset(f)[0]
chunk_ratio = (1 << 23) * lss // bs
size = new_vhd_file_size
max_internal_size = (bs * chunk_ratio * (size - hs -
ls - ms - bes - bes // chunk_ratio) //
(bs *
chunk_ratio + bes * chunk_ratio + bes))
return max_internal_size - (max_internal_size % bs)
except IOError as ex:
raise exceptions.VHDException(
_("Unable to obtain internal size from VHDX: "
"%(vhd_path)s. Exception: %(ex)s") %
{"vhd_path": vhd_path, "ex": ex})
def _get_vhdx_current_header_offset(self, vhdx_file):
sequence_numbers = []
for offset in VHDX_HEADER_OFFSETS:
vhdx_file.seek(offset + 8)
sequence_numbers.append(struct.unpack('<Q',
vhdx_file.read(8))[0])
current_header = sequence_numbers.index(max(sequence_numbers))
return VHDX_HEADER_OFFSETS[current_header]
def _get_vhdx_log_size(self, vhdx_file):
current_header_offset = self._get_vhdx_current_header_offset(vhdx_file)
offset = current_header_offset + VHDX_LOG_LENGTH_OFFSET
vhdx_file.seek(offset)
log_size = struct.unpack('<I', vhdx_file.read(4))[0]
return log_size
def _get_vhdx_metadata_size_and_offset(self, vhdx_file):
offset = VHDX_METADATA_SIZE_OFFSET + VHDX_REGION_TABLE_OFFSET
vhdx_file.seek(offset)
metadata_offset = struct.unpack('<Q', vhdx_file.read(8))[0]
metadata_size = struct.unpack('<I', vhdx_file.read(4))[0]
return metadata_size, metadata_offset
def _get_vhdx_block_size(self, vhdx_file):
metadata_offset = self._get_vhdx_metadata_size_and_offset(vhdx_file)[1]
offset = metadata_offset + VHDX_BS_METADATA_ENTRY_OFFSET
vhdx_file.seek(offset)
file_parameter_offset = struct.unpack('<I', vhdx_file.read(4))[0]
vhdx_file.seek(file_parameter_offset + metadata_offset)
block_size = struct.unpack('<I', vhdx_file.read(4))[0]
return block_size
def get_best_supported_vhd_format(self):
return constants.DISK_FORMAT_VHDX
def flatten_vhd(self, vhd_path):
base_path, ext = os.path.splitext(vhd_path)
tmp_path = base_path + '.tmp' + ext
self.convert_vhd(vhd_path, tmp_path)
os.unlink(vhd_path)
os.rename(tmp_path, vhd_path)
def attach_virtual_disk(self, vhd_path, read_only=True,
detach_on_handle_close=False):
"""Attach a virtual disk image.
:param vhd_path: the path of the image to attach
:param read_only: (bool) attach the image in read only mode
:parma detach_on_handle_close: if set, the image will automatically be
detached when the last image handle is
closed.
:returns: if 'detach_on_handle_close' is set, it returns a virtual
disk image handle that may be closed using the
'close' method of this class.
"""
open_access_mask = (w_const.VIRTUAL_DISK_ACCESS_ATTACH_RO
if read_only
else w_const.VIRTUAL_DISK_ACCESS_ATTACH_RW)
attach_virtual_disk_flag = 0
if not detach_on_handle_close:
attach_virtual_disk_flag |= (
w_const.ATTACH_VIRTUAL_DISK_FLAG_PERMANENT_LIFETIME)
if read_only:
attach_virtual_disk_flag |= (
w_const.ATTACH_VIRTUAL_DISK_FLAG_READ_ONLY)
handle = self._open(
vhd_path,
open_access_mask=open_access_mask)
self._run_and_check_output(
virtdisk.AttachVirtualDisk,
handle,
None, # security descriptor
attach_virtual_disk_flag,
0, # provider specific flags
None, # attach parameters
None, # overlapped structure
cleanup_handle=handle if not detach_on_handle_close else None)
if detach_on_handle_close:
return handle
def detach_virtual_disk(self, vhd_path):
open_access_mask = w_const.VIRTUAL_DISK_ACCESS_DETACH
handle = self._open(vhd_path, open_access_mask=open_access_mask)
ret_val = self._run_and_check_output(
virtdisk.DetachVirtualDisk,
handle,
0, # detach flags
0, # provider specific flags
ignored_error_codes=[w_const.ERROR_NOT_READY],
cleanup_handle=handle)
if ret_val == w_const.ERROR_NOT_READY:
LOG.debug("Image %s was not attached.", vhd_path)
def get_virtual_disk_physical_path(self, vhd_path):
"""Returns the physical disk path for an attached disk image.
:param vhd_path: an attached disk image path.
:returns: the mount path of the specified image, in the form of
\\.\PhysicalDriveX.
"""
open_flag = w_const.OPEN_VIRTUAL_DISK_FLAG_NO_PARENTS
open_access_mask = (w_const.VIRTUAL_DISK_ACCESS_GET_INFO |
w_const.VIRTUAL_DISK_ACCESS_DETACH)
handle = self._open(
vhd_path,
open_flag=open_flag,
open_access_mask=open_access_mask)
disk_path = (ctypes.c_wchar * w_const.MAX_PATH)()
disk_path_sz = wintypes.ULONG(w_const.MAX_PATH)
self._run_and_check_output(
virtdisk.GetVirtualDiskPhysicalPath,
handle,
ctypes.byref(disk_path_sz),
disk_path,
cleanup_handle=handle)
return disk_path.value
|