ipdevpoll inventory job fails with AttributeError: 'NoneType' object has no attribute 'strip'

[Morten Brekkevold]

Under NAV 4.3.0, the ipdevpoll inventory job fails every time on a Juniper device where there really is only chassis information in NetboxEntity (not from the ENTITY-MIB), when it appears a chassis has been replaced.

Traceback looks as follows (this is in fact compounded by the fact that the NetboxEntity class __unicode__ method does not behave properly on missing attributes):

Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 525, in __bootstrap
    self.__bootstrap_inner()
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
--- <exception caught here> ---
  File "/usr/local/lib/python2.7/dist-packages/twisted/python/threadpool.py", line 172, in _worker
    result = context.call(ctx, function, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/twisted/python/context.py", line 118, in callWithContext
    return self.currentContext().callWithContext(ctx, func, *args, **kw)
  File "/usr/local/lib/python2.7/dist-packages/twisted/python/context.py", line 81, in callWithContext
    return func(*args,**kw)
  File "/source/python/nav/ipdevpoll/db.py", line 152, in _reset
    return func(*args, **kwargs)
  File "/source/python/nav/ipdevpoll/db.py", line 111, in _autocommit
    result = func(*args, **kw)
  File "/source/python/nav/ipdevpoll/db.py", line 130, in _cleanup
    return func(*args, **kwargs)
  File "/source/python/nav/ipdevpoll/jobs.py", line 372, in complete_save_cycle
    self.cleanup_containers_after_save()
  File "/source/python/nav/ipdevpoll/jobs.py", line 390, in cleanup_containers_after_save
    manager.cleanup()
  File "/source/python/nav/ipdevpoll/shadows/entity.py", line 89, in cleanup
    to_purge = self.get_purge_list()
  File "/source/python/nav/ipdevpoll/shadows/entity.py", line 114, in get_purge_list
    sub = subtree(graph, miss)
  File "/usr/local/lib/python2.7/dist-packages/networkx/algorithms/traversal/depth_first_search.py", line 55, in dfs_tree
    T.add_edges_from(dfs_edges(G,source))
  File "/usr/local/lib/python2.7/dist-packages/networkx/classes/digraph.py", line 549, in add_edges_from
    for e in ebunch:
  File "/usr/local/lib/python2.7/dist-packages/networkx/algorithms/traversal/depth_first_search.py", line 36, in dfs_edges
    stack = [(start,iter(G[start]))]
  File "/usr/local/lib/python2.7/dist-packages/networkx/classes/graph.py", line 319, in __getitem__
    return self.adj[n]
exceptions.KeyError: <KeyError instance at 0x7ea5b90 with str error:
 Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/twisted/python/_reflectpy3.py", line 294, in _safeFormat
    return formatter(o)
  File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py", line 373, in __repr__
    u = unicode(self)
  File "/source/python/nav/models/manage.py", line 451, in __unicode__
    if klass and not title.strip().lower().startswith(klass.lower()):
AttributeError: 'NoneType' object has no attribute 'strip'

[Morten Brekkevold (mbrekkevold)]

fix here: https://nav.uninett.no/hg/stable/rev/2a32158f1b19