[Bug 2042744] Re: su -s /bin/sh -c "keystone-manage db_sync" keystone

[Greg Oster]

More details......  I wanted to make a minimal replicator for this
issue.  I started with the command 'keystone-manage db_version', as this
seemed to be the 'simplest' example I could find that would replicate
the exception.  I then started hacking out code, with the idea that if I
took out code, and the exception still occured, I didn't need the
removed code for the replicator.  Where I got to was:

In keystone/cmd/mangage.py I could remove everything except:
from keystone.cmd import cli
and from keystone/cmd/cli.py the only line needed to replicate the issue is:
from keystone.server import backends
and if we look in keystone/server/backends.py it's the line:
from keystone import application_credential
where in keystone/application_credential/__init__.py it's just this line:
from keystone.application_credential.core import *
and then keystone/application_credential/core.py it's this line that is the one that causes the issue:
from keystone import notifications
HOWEVER: in keystone/notifications.py , it's exactly these two lines:
import flask
import oslo_messaging
that are necessary for the exception.  Remove either of those two, and things work fine.

In the attached replicator code 'replicator.py', you can find my
replacement for keystone/notifications.py as 'replicator_lib.py'.
You'll note that replicator_lib.py needs to contain the two lines:

import flask
import oslo_messaging

I note, however, that if you bring the importing of flask and
oslo_messaging into replicator.py, things work again.  The lines *must*
be in something that is imported in order to trigger the exception.

To run the replicator:
virtualenv foo
source foo/bin/activate
pip install flask oslo_messaging
python3 replicator.py

Note that nothing of keystone is actually used here.

And now, if you want the exception to go away, the following change will
work.  Add the line:

import flask

into keystone/application_credential/core.py after the line:

from keystone import notifications

And then 'keystone-manage db_sync' et al. will work without tossing an
exception.  Why?  I have absolutely no clue.


** Attachment added: "replicator.py"
   https://bugs.launchpad.net/keystone/+bug/2042744/+attachment/5746474/+files/replicator.py

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https://bugs.launchpad.net/bugs/2042744

Title:
  su -s /bin/sh -c "keystone-manage db_sync" keystone

Status in OpenStack Identity (keystone):
  Confirmed
Status in keystone package in Ubuntu:
  Confirmed

Bug description:
  When I execute su -s /bin/sh -c "keystone-manage db_sync" keystone

  I am receiving below error

  Exception ignored in: <function _removeHandlerRef at 0x7f01819b43a0>
  Traceback (most recent call last):
    File "/usr/lib/python3.10/logging/__init__.py", line 846, in _removeHandlerRef
    File "/usr/lib/python3.10/logging/__init__.py", line 226, in _acquireLock
    File "/usr/lib/python3.10/threading.py", line 164, in acquire
    File "/usr/lib/python3/dist-packages/eventlet/green/thread.py", line 34, in get_ident
  AttributeError: 'NoneType' object has no attribute 'getcurrent'

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