Description of problem:
Creating a consumer in Katello causes the duplicate key error below.  It may have something to do with creating two consumers in rapid succession.
 
from IRC: 
<linear> hmmm  [12:57]
<linear> jweiss: actually this bug came from registering a consumer  [12:58]
<linear> which is odd  [12:59]
<linear> I wonder if we hit a race condition here
<linear> This is what the code looks like  [13:00]
<linear>         permission = self.permission(resource)
<linear>         if permission is None:
<linear>             permission = self.create(resource)
<linear> and it's exploding the the create
<linear> so it asks the db got the permission doc, doesn't get one, tries to
         create one, and gets a duplicate key error
<linear> I'll look into mongo and see if they have an atomic equivalent of
         that operation  [13:01]
<linear> in the meantime, jweiss, would you file a bug?


Version-Release number of selected component (if applicable):
pulp-0.0.237-4.fc14.noarch

How reproducible:


Steps to Reproduce:
1. 
2.
3.
  
Actual results:


Expected results:


Additional info:
2011-10-12 12:17:19,566 11267:140401121941248: pulp.server.webservices.controllers.decorators:ERROR: decorators:52 Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/pulp/server/webservices/controllers/decorators.py", line 48, in report_error
    return method(self, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/pulp/server/webservices/controllers/decorators.py", line 127, in _auth_decorator
    value = method(self, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/pulp/server/webservices/controllers/consumers.py", line 104, in POST
    add_user_to_role(consumer_users_role, user['login'])
  File "/usr/lib/python2.7/site-packages/pulp/server/auth/authorization.py", line 398, in add_user_to_role
    _permission_api.grant(resource, user, operations)
  File "/usr/lib/python2.7/site-packages/pulp/server/api/permission.py", line 102, in grant
    permission = self._get_or_create(resource)
  File "/usr/lib/python2.7/site-packages/pulp/server/api/permission.py", line 79, in _get_or_create
    permission = self.create(resource)
  File "/usr/lib/python2.7/site-packages/pulp/server/api/permission.py", line 36, in create
    self.collection.insert(permission, safe=True)
  File "/usr/lib/python2.7/site-packages/pulp/server/db/connection.py", line 80, in retry
    return method(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/pymongo/collection.py", line 270, in insert
    check_keys, safe, kwargs), safe)
  File "/usr/lib64/python2.7/site-packages/pymongo/connection.py", line 642, in _send_message
    return self.__check_response_to_last_error(response)
  File "/usr/lib64/python2.7/site-packages/pymongo/connection.py", line 611, in __check_response_to_last_error
    raise DuplicateKeyError(error["err"])
DuplicateKeyError: E11000 duplicate key error index: pulp_database.permissions.$resource_-1  dup key: { : "/consumers/" }

2011-10-12 12:17:19,696 11267:140401130333952: gofer.rmi.policy:INFO: policy:236 sent (391df21b-2e6c-4f77-9f84-029ef8edb150):
{
  "classname": "Consumer",
  "kws": {},
  "args": [],
  "method": "unregistered"
}