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["Davanum Srinivas \(DIMS\)" <davanum@xxxxxxxxx>]

** Also affects: oslo.i18n
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1242820

Title:
  Nova docker virt driver triggers - AttributeError: 'Message' object
  has no attribute 'format'

Status in OpenStack Compute (Nova):
  Invalid
Status in Nova Docker Driver:
  New
Status in The Oslo library incubator:
  Invalid
Status in Oslo Internationalization Library:
  New

Bug description:
  Using the nova virt docker driver and when I try to deploy an instance
  I get:

  2013-10-21 12:18:39.229 20636 ERROR nova.compute.manager [req-270deff8-b0dc-4a05-9923-417dc5b662db c99d13095fbd4605b36a802fd9539a4a a03677565e97495fa798fe6cd2628180] [instance: 206bb110-4fa5-4999-be87-9b10951ad5dd] Error: 'Message' object has no attribute 'format'
  2013-10-21 12:18:39.229 20636 TRACE nova.compute.manager [instance: 206bb110-4fa5-4999-be87-9b10951ad5dd] Traceback (most recent call last):
  2013-10-21 12:18:39.229 20636 TRACE nova.compute.manager [instance: 206bb110-4fa5-4999-be87-9b10951ad5dd]   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1045, in _build_instance
  2013-10-21 12:18:39.229 20636 TRACE nova.compute.manager [instance: 206bb110-4fa5-4999-be87-9b10951ad5dd]     set_access_ip=set_access_ip)
  2013-10-21 12:18:39.229 20636 TRACE nova.compute.manager [instance: 206bb110-4fa5-4999-be87-9b10951ad5dd]   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1444, in _spawn
  2013-10-21 12:18:39.229 20636 TRACE nova.compute.manager [instance: 206bb110-4fa5-4999-be87-9b10951ad5dd]     LOG.exception(_('Instance failed to spawn'), instance=instance)
  2013-10-21 12:18:39.229 20636 TRACE nova.compute.manager [instance: 206bb110-4fa5-4999-be87-9b10951ad5dd]   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1430, in _spawn
  2013-10-21 12:18:39.229 20636 TRACE nova.compute.manager [instance: 206bb110-4fa5-4999-be87-9b10951ad5dd]     block_device_info)
  2013-10-21 12:18:39.229 20636 TRACE nova.compute.manager [instance: 206bb110-4fa5-4999-be87-9b10951ad5dd]   File "/usr/lib/python2.6/site-packages/nova/virt/docker/driver.py", line 297, in spawn
  2013-10-21 12:18:39.229 20636 TRACE nova.compute.manager [instance: 206bb110-4fa5-4999-be87-9b10951ad5dd]     LOG.info(msg.format(image_name))
  2013-10-21 12:18:39.229 20636 TRACE nova.compute.manager [instance: 206bb110-4fa5-4999-be87-9b10951ad5dd]   File "/usr/lib/python2.6/site-packages/nova/openstack/common/gettextutils.py", line 255, in __getattribute__
  2013-10-21 12:18:39.229 20636 TRACE nova.compute.manager [instance: 206bb110-4fa5-4999-be87-9b10951ad5dd]     return UserString.UserString.__getattribute__(self, name)
  2013-10-21 12:18:39.229 20636 TRACE nova.compute.manager [instance: 206bb110-4fa5-4999-be87-9b10951ad5dd] AttributeError: 'Message' object has no attribute 'format'

  On a boot VM flow.

  Based on a tiny bit of poking it appears there is a common
  gettextutils method to wrapper message/string access which does not
  account for the use of Message.format() as used in the docker virt
  driver.

  Honestly based on the code I'm running I'm not sure how spawn worked
  at all for docker as the use of Message.format() is in the boot
  codepath:

  296             msg = _('Image name "{0}" does not exist, fetching it...')
  297             LOG.info(msg.format(image_name))

  This always triggers the no attr message.

  I'm not up to speed on the gettextutils wrapper, but I hacked around
  this by adding 'format' to the list of ops in gettextutils.py:

  
       def __getattribute__(self, name):
  243         # NOTE(mrodden): handle lossy operations that we can't deal with yet
  244         # These override the UserString implementation, since UserString
  245         # uses our __class__ attribute to try and build a new message
  246         # after running the inner data string through the operation.
  247         # At that point, we have lost the gettext message id and can just
  248         # safely resolve to a string instead.
  249         ops = ['capitalize', 'center', 'decode', 'encode',
  250                'expandtabs', 'ljust', 'lstrip', 'replace', 'rjust', 'rstrip',
  251                'strip', 'swapcase', 'title', 'translate', 'upper', 'zfill', 'format']
  252         if name in ops:
  253             return getattr(self.data, name)
  254         else:
  255             return UserString.UserString.__getattribute__(self, name)

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