def test_get_device_letter(self):
self.assertEqual('', block_device.get_device_letter(''))
self.assertEqual('a', block_device.get_device_letter('/dev/sda1'))
self.assertEqual('b', block_device.get_device_letter('/dev/xvdb'))
self.assertEqual('d', block_device.get_device_letter('/dev/d'))
self.assertEqual('a', block_device.get_device_letter('a'))
self.assertEqual('b', block_device.get_device_letter('sdb2'))
self.assertEqual('c', block_device.get_device_letter('vdc'))
self.assertEqual('c', block_device.get_device_letter('hdc'))
self.assertIsNone(block_device.get_device_letter(None))
def test_get_device_letter(self):
self.assertEqual('', block_device.get_device_letter(''))
self.assertEqual('a', block_device.get_device_letter('/dev/sda1'))
self.assertEqual('b', block_device.get_device_letter('/dev/xvdb'))
self.assertEqual('d', block_device.get_device_letter('/dev/d'))
self.assertEqual('a', block_device.get_device_letter('a'))
self.assertEqual('b', block_device.get_device_letter('sdb2'))
self.assertEqual('c', block_device.get_device_letter('vdc'))
self.assertEqual('c', block_device.get_device_letter('hdc'))
self.assertIsNone(block_device.get_device_letter(None))
def get_next_device_name(instance, device_name_list,
root_device_name=None, device=None):
"""Validates (or generates) a device name for instance.
If device is not set, it will generate a unique device appropriate
for the instance. It uses the root_device_name (if provided) and
the list of used devices to find valid device names. If the device
name is valid but applicable to a different backend (for example
/dev/vdc is specified but the backend uses /dev/xvdc), the device
name will be converted to the appropriate format.
"""
req_prefix = None
req_letter = None
if device:
try:
req_prefix, req_letter = block_device.match_device(device)
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=device)
if not root_device_name:
root_device_name = block_device.DEFAULT_ROOT_DEV_NAME
try:
prefix = block_device.match_device(
block_device.prepend_dev(root_device_name))[0]
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=root_device_name)
# NOTE(vish): remove this when xenapi is setting default_root_device
if driver.is_xenapi():
prefix = '/dev/xvd'
if req_prefix != prefix:
LOG.debug("Using %(prefix)s instead of %(req_prefix)s",
{'prefix': prefix, 'req_prefix': req_prefix})
used_letters = set()
for device_path in device_name_list:
letter = block_device.get_device_letter(device_path)
used_letters.add(letter)
# NOTE(vish): remove this when xenapi is properly setting
# default_ephemeral_device and default_swap_device
if driver.is_xenapi():
flavor = instance.get_flavor()
if flavor.ephemeral_gb:
used_letters.add('b')
if flavor.swap:
used_letters.add('c')
if not req_letter:
req_letter = _get_unused_letter(used_letters)
if req_letter in used_letters:
raise exception.DevicePathInUse(path=device)
return prefix + req_letter
def test_get_device_letter(self):
self.assertEqual(block_device.get_device_letter(''), '')
self.assertEqual(block_device.get_device_letter('/dev/sda1'), 'a')
self.assertEqual(block_device.get_device_letter('/dev/xvdb'), 'b')
self.assertEqual(block_device.get_device_letter('/dev/d'), 'd')
self.assertEqual(block_device.get_device_letter('a'), 'a')
self.assertEqual(block_device.get_device_letter('sdb2'), 'b')
self.assertEqual(block_device.get_device_letter('vdc'), 'c')
self.assertEqual(block_device.get_device_letter('hdc'), 'c')
def test_get_device_letter(self):
self.assertEqual(block_device.get_device_letter(""), "")
self.assertEqual(block_device.get_device_letter("/dev/sda1"), "a")
self.assertEqual(block_device.get_device_letter("/dev/xvdb"), "b")
self.assertEqual(block_device.get_device_letter("/dev/d"), "d")
self.assertEqual(block_device.get_device_letter("a"), "a")
self.assertEqual(block_device.get_device_letter("sdb2"), "b")
self.assertEqual(block_device.get_device_letter("vdc"), "c")
self.assertEqual(block_device.get_device_letter("hdc"), "c")
def test_get_device_letter(self):
self.assertEqual(block_device.get_device_letter(''), '')
self.assertEqual(block_device.get_device_letter('/dev/sda1'), 'a')
self.assertEqual(block_device.get_device_letter('/dev/xvdb'), 'b')
self.assertEqual(block_device.get_device_letter('/dev/d'), 'd')
self.assertEqual(block_device.get_device_letter('a'), 'a')
self.assertEqual(block_device.get_device_letter('sdb2'), 'b')
self.assertEqual(block_device.get_device_letter('vdc'), 'c')
self.assertEqual(block_device.get_device_letter('hdc'), 'c')
def get_bdm_image_metadata(context,
image_api,
volume_api,
block_device_mapping,
legacy_bdm=True):
"""Attempt to retrive image metadata from a given block_device_mapping.
If we are booting from a volume, we need to get the volume details from
Cinder and make sure we pass the metadata back accordingly.
:param context: request context
:param image_api: Image API
:param volume_api: Volume API
:param block_device_mapping:
:param legacy_bdm:
"""
if not block_device_mapping:
return {}
for bdm in block_device_mapping:
if (legacy_bdm and block_device.get_device_letter(
bdm.get('device_name', '')) != 'a'):
continue
elif not legacy_bdm and bdm.get('boot_index') != 0:
continue
volume_id = bdm.get('volume_id')
snapshot_id = bdm.get('snapshot_id')
if snapshot_id:
# NOTE(alaski): A volume snapshot inherits metadata from the
# originating volume, but the API does not expose metadata
# on the snapshot itself. So we query the volume for it below.
snapshot = volume_api.get_snapshot(context, snapshot_id)
volume_id = snapshot['volume_id']
if bdm.get('image_id'):
try:
image_id = bdm['image_id']
image_meta = image_api.get(context, image_id)
return image_meta
except Exception:
raise exception.InvalidBDMImage(id=image_id)
elif volume_id:
try:
volume = volume_api.get(context, volume_id)
except exception.CinderConnectionFailed:
raise
except Exception:
raise exception.InvalidBDMVolume(id=volume_id)
if not volume.get('bootable', True):
raise exception.InvalidBDMVolumeNotBootable(id=volume_id)
return get_image_metadata_from_volume(volume)
return {}
def get_root_info(instance,
virt_type,
image_meta,
root_bdm,
disk_bus,
cdrom_bus,
root_device_name=None):
# NOTE (ndipanov): This is a hack to avoid considering an image
# BDM with local target, as we don't support them
# yet. Only applies when passed non-driver format
no_root_bdm = (not root_bdm
or (root_bdm.get('source_type') == 'image'
and root_bdm.get('destination_type') == 'local'))
if no_root_bdm:
# NOTE(mriedem): In case the image_meta object was constructed from
# an empty dict, like in the case of evacuate, we have to first check
# if disk_format is set on the ImageMeta object.
if (image_meta.obj_attr_is_set('disk_format')
and image_meta.disk_format == 'iso'):
root_device_bus = cdrom_bus
root_device_type = 'cdrom'
else:
root_device_bus = disk_bus
root_device_type = 'disk'
if root_device_name:
root_device_bus = get_disk_bus_for_disk_dev(
virt_type, root_device_name)
else:
root_device_name = find_disk_dev_for_disk_bus({}, root_device_bus)
return {
'bus': root_device_bus,
'type': root_device_type,
'dev': block_device.strip_dev(root_device_name),
'boot_index': '1'
}
if not get_device_name(root_bdm) and root_device_name:
root_bdm = root_bdm.copy()
# it can happen, eg for libvirt+Xen, that the root_device_name is
# incompatible with the disk bus. In that case fix the root_device_name
if virt_type == 'xen':
dev_prefix = get_dev_prefix_for_disk_bus(disk_bus)
if not root_device_name.startswith(dev_prefix):
letter = block_device.get_device_letter(root_device_name)
root_device_name = '%s%s' % (dev_prefix, letter)
root_bdm['device_name'] = root_device_name
return get_info_from_bdm(instance, virt_type, image_meta, root_bdm, {},
disk_bus)
def get_root_info(instance, virt_type, image_meta, root_bdm,
disk_bus, cdrom_bus, root_device_name=None):
# NOTE (ndipanov): This is a hack to avoid considering an image
# BDM with local target, as we don't support them
# yet. Only applies when passed non-driver format
no_root_bdm = (not root_bdm or (
root_bdm.get('source_type') == 'image' and
root_bdm.get('destination_type') == 'local'))
if no_root_bdm:
# NOTE(mriedem): In case the image_meta object was constructed from
# an empty dict, like in the case of evacuate, we have to first check
# if disk_format is set on the ImageMeta object.
if (image_meta.obj_attr_is_set('disk_format') and
image_meta.disk_format == 'iso'):
root_device_bus = cdrom_bus
root_device_type = 'cdrom'
else:
root_device_bus = disk_bus
root_device_type = 'disk'
if root_device_name:
root_device_bus = get_disk_bus_for_disk_dev(virt_type,
root_device_name)
else:
root_device_name = find_disk_dev_for_disk_bus({}, root_device_bus)
return {'bus': root_device_bus,
'type': root_device_type,
'dev': block_device.strip_dev(root_device_name),
'boot_index': '1'}
if not get_device_name(root_bdm) and root_device_name:
root_bdm = root_bdm.copy()
# it can happen, eg for libvirt+Xen, that the root_device_name is
# incompatible with the disk bus. In that case fix the root_device_name
if virt_type == 'xen':
dev_prefix = get_dev_prefix_for_disk_bus(disk_bus)
if not root_device_name.startswith(dev_prefix):
letter = block_device.get_device_letter(root_device_name)
root_device_name = '%s%s' % (dev_prefix, letter)
root_bdm['device_name'] = root_device_name
return get_info_from_bdm(instance, virt_type, image_meta,
root_bdm, {}, disk_bus)
