cinder: missing libraries are not detected until certain API operations fail

[Takashi Kajinami]

The cinder store driver requires os-brick and oslo-privsep in addition to cinderclient.

While cinderclient is checked when a cinder store is initialized, the other libraries are not checked during the initialization.

As a result, a cinder store can be initialized without any error even when os-brick or oslo-privsep is missing. The missing libraries causes failure when the cinder store driver tries to access data in a cinder volume, so create image or delete image may fail with server error caused by internal AttributeError.

We should check the required libraries when a cinder store is being initialized so that operators can detect their incomplete deployment, rather than exposing server error to users.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/glance_store/+/900121
Committed: https://opendev.org/openstack/glance_store/commit/651f41a95a1703c5717fc47b8d9847d4da98c7de
Submitter: "Zuul (22348)"
Branch: master

commit 651f41a95a1703c5717fc47b8d9847d4da98c7de
Author: Takashi Kajinami <email address hidden>
Date: Sun Nov 5 14:25:42 2023 +0900

    cinder: Catch missing dependencies

    Cinder store requires a few additional dependencies.
     - cinderclient
     - os.brick
     - oslo.provsep

    Currently the driver handles missing cinderclient, but it does not
    properly treat in case one of the other two libraries is unavailable.

    Note that oslo.rootwrap is also part of the additional dependencies but
    this library is not directly imported. So we do not implement check
    at store initialization.

    Closes-Bug: #2043583
    Change-Id: I4ea0a9749fdd821f3f958f77a2923b0fafefa471

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/glance_store 4.7.0 release.