def drive_from_element(disk_devices, disk_element):
# we try serial first for backward compatibility
# REQUIRED_FOR: vdsm <= 4.2
serial_elem = vmxml.find_first(disk_element, 'serial', None)
if serial_elem is not None:
serial = vmxml.text(serial_elem)
try:
return drive_by_serial(disk_devices, serial)
except LookupError:
pass # try again by alias before to give up
alias = core.find_device_alias(disk_element)
return device_by_alias(disk_devices, alias)
def drive_from_element(disk_devices, disk_element):
# we try serial first for backward compatibility
# REQUIRED_FOR: vdsm <= 4.2
serial_elem = vmxml.find_first(disk_element, 'serial', None)
if serial_elem is not None:
serial = vmxml.text(serial_elem)
try:
return drive_by_serial(disk_devices, serial)
except LookupError:
pass # try again by alias before to give up
alias = core.find_device_alias(disk_element)
return device_by_alias(disk_devices, alias)
def xml_device_by_alias(device_xml, alias):
"""
Return an XML device having the given alias.
:param device_xml: parsed <devices> element, typically taken
from DomainDescriptor.devices
:type device_xml: DOM object
:param alias: device alias
:type alias: string
:returns: DOM object of the device element having the given alias
:raises: `LookupError` if no device with `alias` is found
"""
for dom in vmxml.children(device_xml):
xml_alias = core.find_device_alias(dom)
if xml_alias and xml_alias == alias:
return dom
raise LookupError("Unable to find matching XML for device %r" % (alias, ))
def detachDevice(self, device_xml):
if self.vm is not None:
dev = xmlutils.fromstring(device_xml)
alias = core.find_device_alias(dev)
self.vm.onDeviceRemoved(alias)
def detachDevice(self, device_xml):
if self.vm is not None:
dev = xmlutils.fromstring(device_xml)
alias = core.find_device_alias(dev)
self.vm.onDeviceRemoved(alias)
def device_from_xml_alias(devices, device_xml):
dev = xmlutils.fromstring(device_xml)
alias = core.find_device_alias(dev)
return device_by_alias(devices, alias)
