191 lines
6.8 KiB
Python
191 lines
6.8 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012 Cloudbase Solutions Srl
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import ctypes
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import os
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import shutil
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import sys
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import tempfile
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import uuid
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import wmi
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from ctypes import wintypes
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from cloudbaseinit.openstack.common import log as logging
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from cloudbaseinit.osutils import factory as osutils_factory
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from cloudbaseinit.utils.windows import physical_disk
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from cloudbaseinit.utils.windows import virtual_disk
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LOG = logging.getLogger(__name__)
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class ConfigDriveManager(object):
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def _get_physical_disks_path(self):
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l = []
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conn = wmi.WMI(moniker='//./root/cimv2')
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q = conn.query('SELECT DeviceID FROM Win32_DiskDrive')
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for r in q:
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l.append(r.DeviceID)
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return l
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def _get_config_drive_cdrom_mount_point(self):
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osutils = osutils_factory.OSUtilsFactory().get_os_utils()
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for drive in osutils.get_cdrom_drives():
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label = osutils.get_volume_label(drive)
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if label == "config-2" and \
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os.path.exists(os.path.join(drive,
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'openstack\\latest\\'
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'meta_data.json')):
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return drive
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return None
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def _c_char_array_to_c_ushort(self, buf, offset):
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low = ctypes.cast(buf[offset],
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ctypes.POINTER(wintypes.WORD)).contents
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high = ctypes.cast(buf[offset + 1],
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ctypes.POINTER(wintypes.WORD)).contents
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return (high.value << 8) + low.value
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def _get_iso_disk_size(self, phys_disk):
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geom = phys_disk.get_geometry()
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if geom.MediaType != physical_disk.Win32_DiskGeometry.FixedMedia:
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return None
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disk_size = geom.Cylinders * geom.TracksPerCylinder * \
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geom.SectorsPerTrack * geom.BytesPerSector
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boot_record_off = 0x8000
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id_off = 1
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volume_size_off = 80
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block_size_off = 128
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iso_id = 'CD001'
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offset = boot_record_off / geom.BytesPerSector * geom.BytesPerSector
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bytes_to_read = geom.BytesPerSector
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if disk_size <= offset + bytes_to_read:
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return None
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phys_disk.seek(offset)
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(buf, bytes_read) = phys_disk.read(bytes_to_read)
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buf_off = boot_record_off - offset + id_off
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if iso_id != buf[buf_off: buf_off + len(iso_id)]:
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return None
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buf_off = boot_record_off - offset + volume_size_off
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num_blocks = self._c_char_array_to_c_ushort(buf, buf_off)
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buf_off = boot_record_off - offset + block_size_off
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block_size = self._c_char_array_to_c_ushort(buf, buf_off)
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return num_blocks * block_size
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def _write_iso_file(self, phys_disk, path, iso_file_size):
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with open(path, 'wb') as f:
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geom = phys_disk.get_geometry()
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disk_size = geom.Cylinders * geom.TracksPerCylinder * \
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geom.SectorsPerTrack * geom.BytesPerSector
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offset = 0
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# Get a multiple of the sector byte size
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bytes_to_read = 4096 / geom.BytesPerSector * geom.BytesPerSector
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while offset < iso_file_size:
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phys_disk.seek(offset)
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bytes_to_read = min(bytes_to_read, iso_file_size - offset)
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(buf, bytes_read) = phys_disk.read(bytes_to_read)
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f.write(buf)
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offset += bytes_read
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def _copy_iso_files(self, iso_file_path, target_path):
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virt_disk = virtual_disk.VirtualDisk(iso_file_path)
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virt_disk.open()
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try:
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virt_disk.attach()
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cdrom_mount_point = virt_disk.get_cdrom_drive_mount_point()
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shutil.copytree(cdrom_mount_point, target_path)
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finally:
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try:
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virt_disk.detach()
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except:
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pass
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virt_disk.close()
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def _extract_iso_disk_file(self, iso_file_path):
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iso_disk_found = False
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for path in self._get_physical_disks_path():
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phys_disk = physical_disk.PhysicalDisk(path)
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try:
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phys_disk.open()
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iso_file_size = self._get_iso_disk_size(phys_disk)
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if iso_file_size:
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self._write_iso_file(phys_disk, iso_file_path,
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iso_file_size)
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iso_disk_found = True
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break
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except:
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# Ignore exception
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pass
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finally:
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phys_disk.close()
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return iso_disk_found
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def _os_supports_iso_virtual_disks(self):
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# Feature supported starting from Windows 8 / 2012
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ver = sys.getwindowsversion()
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supported = (ver[0] >= 6 and ver[1] >= 2)
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if not supported:
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LOG.debug('ISO virtual disks are not supported on '
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'this version of Windows')
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return supported
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def get_config_drive_files(self, target_path, check_raw_hhd=True,
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check_cdrom=True):
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config_drive_found = False
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if check_raw_hhd and self._os_supports_iso_virtual_disks():
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LOG.debug('Looking for Config Drive in raw HDDs')
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config_drive_found = self._get_conf_drive_from_raw_hdd(
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target_path)
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if not config_drive_found and check_cdrom:
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LOG.debug('Looking for Config Drive in cdrom drives')
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config_drive_found = self._get_conf_drive_from_cdrom_drive(
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target_path)
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return config_drive_found
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def _get_conf_drive_from_cdrom_drive(self, target_path):
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cdrom_mount_point = self._get_config_drive_cdrom_mount_point()
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if cdrom_mount_point:
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shutil.copytree(cdrom_mount_point, target_path)
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return True
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return False
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def _get_conf_drive_from_raw_hdd(self, target_path):
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config_drive_found = False
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iso_file_path = os.path.join(tempfile.gettempdir(),
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str(uuid.uuid4()) + '.iso')
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try:
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if self._extract_iso_disk_file(iso_file_path):
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self._copy_iso_files(iso_file_path, target_path)
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config_drive_found = True
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finally:
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if os.path.exists(iso_file_path):
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os.remove(iso_file_path)
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return config_drive_found
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