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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => liberty-3

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https://bugs.launchpad.net/bugs/1486041

Title:
  IntegrityError: NOT NULL constraint failed: tags.resource_id during
  instance_tag_set

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Steps to reproduce:

   1. create instance
   2. set ['tag1', 'tag2'] to the instance
   3. set ['tag1'] to the instance

  Expected result:
      tags were added.

  Actual result:

      2015-08-18 16:26:36,601 ERROR [oslo_db.sqlalchemy.exc_filters] DBAPIError exception wrapped from (sqlite3.IntegrityError) NOT NULL constraint failed: tags.resource_id [SQL: u'INSERT INTO tags DEFAULT VALUES']
      Traceback (most recent call last):
        File "/opt/stack/nova/.tox/py27/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1139, in _execute_context
          context)
        File "/opt/stack/nova/.tox/py27/local/lib/python2.7/site-packages/sqlalchemy/engine/default.py", line 450, in do_execute
          cursor.execute(statement, parameters)
      IntegrityError: NOT NULL constraint failed: tags.resource_id

  It happens because list 'to_add' in method 'instance_tag_set' is empty
  in second case. It's empty because on step 3 must delete one tag and
  create zero tags. So to fix bug we must check list to_add.

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