nova-compute AttributeError: six 'module' object has no attribute 'add_metaclass'

[Larry Michel]

When deploying OpenStack with icehouse and precise with next branches, seeing this hook install failure.

I have seen this error python-six having a version below 1.4.

2014-12-02 03:58:43 INFO install Adding system user `nova' (UID 110) ...
2014-12-02 03:58:43 INFO install Adding new user `nova' (UID 110) with group `nova' ...
2014-12-02 03:58:43 INFO install Not creating home directory `/var/lib/nova'.
2014-12-02 03:58:43 INFO install usermod: no changes
2014-12-02 03:58:44 INFO install Traceback (most recent call last):
2014-12-02 03:58:44 INFO install File "/usr/bin/nova-manage", line 6, in <module>
2014-12-02 03:58:44 INFO install from nova.cmd.manage import main
2014-12-02 03:58:44 INFO install File "/usr/lib/python2.7/dist-packages/nova/cmd/manage.py", line 62, in <module>
2014-12-02 03:58:44 INFO install from oslo import messaging
2014-12-02 03:58:44 INFO install File "/usr/lib/python2.7/dist-packages/oslo/messaging/__init__.py", line 18, in <module>
2014-12-02 03:58:44 INFO install from .notify import *
2014-12-02 03:58:44 INFO install File "/usr/lib/python2.7/dist-packages/oslo/messaging/notify/__init__.py", line 22, in <module>
2014-12-02 03:58:44 INFO install from .notifier import *
2014-12-02 03:58:44 INFO install File "/usr/lib/python2.7/dist-packages/oslo/messaging/notify/notifier.py", line 27, in <module>
2014-12-02 03:58:44 INFO install from oslo.messaging import serializer as msg_serializer
2014-12-02 03:58:44 INFO install File "/usr/lib/python2.7/dist-packages/oslo/messaging/serializer.py", line 24, in <module>
2014-12-02 03:58:44 INFO install @six.add_metaclass(abc.ABCMeta)
2014-12-02 03:58:44 INFO install AttributeError: 'module' object has no attribute 'add_metaclass'
2014-12-02 03:58:44 INFO install dpkg: error processing nova-common (--configure):
2014-12-02 03:58:44 INFO install subprocess installed post-installation script returned error exit status 1

This results in hook failed install error:

nova-compute:
    charm: local:precise/nova-compute-132
    exposed: false
    relations:
      compute-peer:
      - nova-compute
    units:
      nova-compute/0:
        agent-state: started
        agent-version: 1.20.13
        machine: '1'
        public-address: signet.oil
      nova-compute/1:
        agent-state: started
        agent-version: 1.20.13
        machine: '2'
        public-address: hayward-19.oil
      nova-compute/2:
        agent-state: error
        agent-state-info: 'hook failed: "install"'
        agent-version: 1.20.13
        machine: '3'
        public-address: pomeroy.oil

[Liam Young (gnuoy)]

This was fixed at r96 ( 2014-12-17)