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[Matt Riedemann <mriedem@xxxxxxxxxx>]

** Also affects: nova/kilo
   Importance: Undecided
       Status: New

** Also affects: nova/liberty
   Importance: Undecided
       Status: New

** Changed in: nova/kilo
       Status: New => Confirmed

** Changed in: nova/liberty
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1551900

Title:
  test_virt_drivers.LibvirtConnTestCase fails if /etc/machine-id is
  empty

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) kilo series:
  Confirmed
Status in OpenStack Compute (nova) liberty series:
  Confirmed

Bug description:
  This is related to bug 1475353 but in this case unit tests fail if the
  file exists but is empty. Either way we shouldn't be trying to read
  from a file on the system in unit tests, so we should set the
  CONF.libvirt.sysinfo_serial config option value to 'none' in the
  tests.

  Example failure (this is from Juno):

  nova.tests.virt.test_virt_drivers.LibvirtConnTestCase.test_block_stats
  ----------------------------------------------------------------------

  Captured traceback:
  ~~~~~~~~~~~~~~~~~~~
      Traceback (most recent call last):
        File "nova/tests/virt/test_virt_drivers.py", line 54, in wrapped_func
          return f(self, *args, **kwargs)
        File "nova/tests/virt/test_virt_drivers.py", line 521, in test_block_stats
          instance_ref, network_info = self._get_running_instance()
        File "nova/tests/virt/test_virt_drivers.py", line 228, in _get_running_instance
          [], 'herp', network_info=network_info)
        File "nova/virt/libvirt/driver.py", line 2661, in spawn
          write_to_disk=True)
        File "nova/virt/libvirt/driver.py", line 4182, in _get_guest_xml
          context)
        File "nova/virt/libvirt/driver.py", line 3863, in _get_guest_config
          guest.sysinfo = self._get_guest_config_sysinfo(instance)
        File "nova/virt/libvirt/driver.py", line 3582, in _get_guest_config_sysinfo
          sysinfo.system_serial = self._sysinfo_serial_func()
        File "nova/virt/libvirt/driver.py", line 3571, in _get_host_sysinfo_serial_auto
          return self._get_host_sysinfo_serial_os()
        File "nova/virt/libvirt/driver.py", line 3567, in _get_host_sysinfo_serial_os
          return str(uuid.UUID(f.read().split()[0]))
      IndexError: list index out of range
      Traceback (most recent call last):
      _StringException: Empty attachments:
        stderr
        stdout

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