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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Also affects: nova/ocata
   Importance: Undecided
       Status: New

** Also affects: nova/pike
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1729806

Title:
  nova-manage update_cell does not check if the same combination of
  transport_url and database_connection already exists

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) ocata series:
  New
Status in OpenStack Compute (nova) pike series:
  New

Bug description:
  Unlike in nova-manage create_cell, in nova-manage update_cell the
  check for the same combination of transport-url and
  database_connection does not exist. Hence it allows a user to update a
  cell's transport-url and database_connection to another existing
  cell's configuration which can create inconsistency (if a user
  accidentally does do it) and should not be allowed IMO.

  Steps to Reproduce :

  -> nova-manage cell_v2 list_cells

  +-------+--------------------------------------+-----------------------------------------------------------+--------------------------------------------------------------------+
  |  Name |                 UUID                 |                       Transport URL                       |                        Database Connection                         |
  +-------+--------------------------------------+-----------------------------------------------------------+--------------------------------------------------------------------+
  | cell0 | 00000000-0000-0000-0000-000000000000 |                           none:/                          |    mysql+pymysql://root:****@127.0.0.1/nova_cell0?charset=utf8     |
  | cell1 | 20f9fd43-7295-4f67-8f0c-7828b12f5e4f |  rabbit://stackrabbit:****@188.185.83.1:5672/nova_cell1  |  mysql+pymysql://root:****@188.185.83.1/nova_cell1?charset=utf8  |
  | cell2 | 7acaf644-d181-420b-ac80-486b83793bd2 | rabbit://stackrabbit:****@188.185.83.2:5672/nova_cell1 | mysql+pymysql://root:****@188.185.83.2/nova_cell1?charset=utf8 |
  +-------+--------------------------------------+-----------------------------------------------------------+--------------------------------------------------------------------+

  -> nova-manage cell_v2 update_cell --cell-uuid 7acaf644-d181-420b-
  ac80-486b83793bd2 --transport-url
  rabbit://stackrabbit:****@188.185.83.1:5672/nova_cell1
  --database_connection
  mysql+pymysql://root:****@188.185.83.1/nova_cell1?charset=utf8

  Expected result
  ===============
  "Cell with the specified transport_url and database_connection combination already exists"

  Actual result
  =============

  -> nova-manage cell_v2 list_cells

  +-------+--------------------------------------+-----------------------------------------------------------+--------------------------------------------------------------------+
  |  Name |                 UUID                 |                       Transport URL                       |                        Database Connection                         |
  +-------+--------------------------------------+-----------------------------------------------------------+--------------------------------------------------------------------+
  | cell0 | 00000000-0000-0000-0000-000000000000 |                           none:/                          |    mysql+pymysql://root:****@127.0.0.1/nova_cell0?charset=utf8     |
  | cell1 | 20f9fd43-7295-4f67-8f0c-7828b12f5e4f |  rabbit://stackrabbit:****@188.185.83.1:5672/nova_cell1  |  mysql+pymysql://root:****@188.185.83.1/nova_cell1?charset=utf8  |
  | cell2 | 7acaf644-d181-420b-ac80-486b83793bd2 | rabbit://stackrabbit:****@188.185.83.1:5672/nova_cell1 | mysql+pymysql://root:****@188.185.83.1/nova_cell1?charset=utf8 |
  +-------+--------------------------------------+-----------------------------------------------------------+--------------------------------------------------------------------+

  Solution : The same kind of check in nova-manage create_cell needs to
  be done in nova-manage update_cell  as well.

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