[Bug 1760918] Fix merged to oslo.versionedobjects (stable/queens)

[OpenStack Infra]

Reviewed:  https://review.openstack.org/559815
Committed: https://git.openstack.org/cgit/openstack/oslo.versionedobjects/commit/?id=e918eb976fb5a6f9fa7b7644d5a10d383fcfcf21
Submitter: Zuul
Branch:    stable/queens

commit e918eb976fb5a6f9fa7b7644d5a10d383fcfcf21
Author: Seyeong Kim <seyeong.kim at canonical.com>
Date:   Thu Mar 29 10:03:51 2018 -0700

    Fixing UUID coerce function for unicode non uuid form
    
    If we use non uuid unicode user id in py27 env,
    unicode error pop up when function is called.
    
    Closes-bug: #1760918
    
    Change-Id: Ic6b6308fb1960ec40407e6efde30137b64543e72
    (cherry picked from commit b1d0b5d886afef8c08330bf3c2291e180aa1f534)

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https://bugs.launchpad.net/bugs/1760918

Title:
  [SRU] Fixing UUID coerce function for unicode non uuid form

Status in Ubuntu Cloud Archive:
  Fix Committed
Status in Ubuntu Cloud Archive mitaka series:
  Triaged
Status in Ubuntu Cloud Archive ocata series:
  Fix Committed
Status in Ubuntu Cloud Archive pike series:
  Fix Committed
Status in Ubuntu Cloud Archive queens series:
  Fix Committed
Status in oslo.versionedobjects:
  Fix Released
Status in python-oslo.versionedobjects package in Ubuntu:
  Fix Released
Status in python-oslo.versionedobjects source package in Xenial:
  Triaged
Status in python-oslo.versionedobjects source package in Artful:
  Triaged
Status in python-oslo.versionedobjects source package in Bionic:
  Fix Released

Bug description:
  [Impact]

  When user id is non UUID unicode (from old release),

  This function emit exception in python 2.7 env

  Because there are str(value)

  which means ok in python 3 (unicode)
  not ok in python 2 (non unicode)

  just updated upstream, so i assume that below releases are affected

  Xenial, Artful, Bionic
  Mitaka, Ocata, Pike, Queens

  [Test Case]

  1. deploy openstack env
  2. source novarc ( as admin )
  3. keystone user-create --name test
  4. openstack user set --password-prompt test
  4. log into keystone node and install mysql-client
  5. connect to mysql with keystone user
  6. do below query
  - set foreign_key_checks = 0;
  - update local_user set user_id='Gāo' where user_id='UUID';
  - update user set id='Gāo' where id='UUID';
  - set foreign_key_checks = 1;
  7. keystone user-role-add --user test --tenant admin --role Admin
  8. source novarc ( as test )
  9. cinder create --name test 1

  got unicode error on cinder-api node logs

  [Regression Potential]
  This patch make code handles unicode non uuid form user id. Basically this has little risk. but cinder-api service need to be restarted.

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