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Getting link attributes via IPDevice fails for interfaces with long
names on xenial. This can be seen in the functional test
test_get_device_mac_too_long_name, which fails on xenial. Reproducible
on the gate with 'check experimental'.

The output from the failed test is:
ft1.1: neutron.tests.functional.agent.linux.test_ip_lib.IpLibTestCase.test_get_device_mac_too_long_name_StringException: Empty attachments:
  stderr
  stdout

pythonlogging:'': {{{
DEBUG [stevedore.extension] found extension EntryPoint.parse('pika = oslo_messaging._drivers.impl_pika:PikaDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('kombu = oslo_messaging._drivers.impl_rabbit:RabbitDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('fake = oslo_messaging._drivers.impl_fake:FakeDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('zmq = oslo_messaging._drivers.impl_zmq:ZmqDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('amqp = oslo_messaging._drivers.impl_amqp1:ProtonDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('rabbit = oslo_messaging._drivers.impl_rabbit:RabbitDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('kafka = oslo_messaging._drivers.impl_kafka:KafkaDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('pika = oslo_messaging._drivers.impl_pika:PikaDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('kombu = oslo_messaging._drivers.impl_rabbit:RabbitDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('fake = oslo_messaging._drivers.impl_fake:FakeDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('zmq = oslo_messaging._drivers.impl_zmq:ZmqDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('amqp = oslo_messaging._drivers.impl_amqp1:ProtonDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('rabbit = oslo_messaging._drivers.impl_rabbit:RabbitDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('kafka = oslo_messaging._drivers.impl_kafka:KafkaDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('pika = oslo_messaging._drivers.impl_pika:PikaDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('kombu = oslo_messaging._drivers.impl_rabbit:RabbitDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('fake = oslo_messaging._drivers.impl_fake:FakeDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('zmq = oslo_messaging._drivers.impl_zmq:ZmqDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('amqp = oslo_messaging._drivers.impl_amqp1:ProtonDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('rabbit = oslo_messaging._drivers.impl_rabbit:RabbitDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('kafka = oslo_messaging._drivers.impl_kafka:KafkaDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('pika = oslo_messaging._drivers.impl_pika:PikaDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('kombu = oslo_messaging._drivers.impl_rabbit:RabbitDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('fake = oslo_messaging._drivers.impl_fake:FakeDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('zmq = oslo_messaging._drivers.impl_zmq:ZmqDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('amqp = oslo_messaging._drivers.impl_amqp1:ProtonDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('rabbit = oslo_messaging._drivers.impl_rabbit:RabbitDriver')
   DEBUG [stevedore.extension] found extension EntryPoint.parse('kafka = oslo_messaging._drivers.impl_kafka:KafkaDriver')
   DEBUG [oslo_policy._cache_handler] Reloading cached file /opt/stack/new/neutron/neutron/tests/etc/policy.json
   DEBUG [oslo_policy.policy] Reloaded policy file: /opt/stack/new/neutron/neutron/tests/etc/policy.json
 WARNING [oslo_policy.policy] Policies ['update_rbac_policy:target_tenant'] are part of a cyclical reference.
}}}

Traceback (most recent call last):
  File "neutron/tests/base.py", line 125, in func
    return f(self, *args, **kwargs)
  File "neutron/tests/functional/agent/linux/test_ip_lib.py", line 177, in test_get_device_mac_too_long_name
    device = self.manage_device(attr)
  File "neutron/tests/functional/agent/linux/test_ip_lib.py", line 83, in manage_device
    namespace=attr.namespace)
  File "neutron/agent/linux/interface.py", line 113, in init_l3
    default_ipv6_lla = ip_lib.get_ipv6_lladdr(device.link.address)
  File "neutron/agent/linux/ip_lib.py", line 531, in address
    return self.attributes.get('link/ether')
  File "neutron/agent/linux/ip_lib.py", line 555, in attributes
    return self._parse_line(self._run(['o'], ('show', self.name)))
  File "neutron/agent/linux/ip_lib.py", line 361, in _run
    return self._parent._run(options, self.COMMAND, args)
  File "neutron/agent/linux/ip_lib.py", line 81, in _run
    return self._as_root(options, command, args)
  File "neutron/agent/linux/ip_lib.py", line 96, in _as_root
    log_fail_as_error=self.log_fail_as_error)
  File "neutron/agent/linux/ip_lib.py", line 105, in _execute
    log_fail_as_error=log_fail_as_error)
  File "neutron/agent/linux/utils.py", line 139, in execute
    raise RuntimeError(msg)
RuntimeError: Exit code: 255; Stdin: ; Stdout: ; Stderr: Error: argument "teste330f1130ac45f8d" is wrong: "name" too long

** Affects: neutron
     Importance: Undecided
     Assignee: Omer Anson (omer-anson)
         Status: New

-- 
Getting link attributes via IPDevice fails for interfaces with long names on xenial
https://bugs.launchpad.net/bugs/1637993
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