New Driver Review Checklist

Reviewers can use this list for some common things to watch for when doing new driver reviews. This list is by no means exhaustive, but does try to capture some of things that have been found in past reviews.

Note

Feel free to propose additional items to help make this a more complete list.

Review Checklist

  • Driver Code

    • Passing all gate tests

    • Driver keeps all configuration in cinder.conf and not in separate vendor specific config file.

      • xml files for configs are forbidden

  • Common gotchas

    • Code should use volume.name_id instead of volume.id.

    • Handles detach where connector == None for force detach

    • Create from snapshot and clone properly account for new volume size being larger than original volume size

    • Volume not found in delete calls should return success

    • Ensure proper code format w/ pep8 (tox -e pep8), but start here first: https://docs.openstack.org/hacking/latest/user/hacking.html

      • tox -e fast8 can be used as a quick check only against modified files

    • Unit tests included for all but trivial code in driver

      • Make sure there’s an __init__.py file in the directory containing the test files or they won’t be discovered by stestr when running the generic tox -e pyXX command to run unit tests.

      • Use the results of the cinder-code-coverage job or run tox -e cover locally to see a test coverage report.

    • All source code files contain Apache 2 copyright header

      • Stating copyright for vendor is optional

      • Don’t attribute copyright to the OpenStack Foundation

    • Run tox -e compliance to make sure all required interfaces are implemented.

    • Required in driver:

      • Concrete driver implementation has decorator @interface.volumedriver

      • VERSION constant defined in driver class

      • CI_WIKI_NAME constant defined in driver class

      • well documented version history in the comment block for the main driver class.

      • Support minimum driver features.

      • Meet release deadline(s)

        • By Milestone 2 of the current development cycle, the driver should have working third party CI and no code review issues.

        • You can find the exact date on the current release schedule, which you can find from https://releases.openstack.org/index.html

    • Driver does not add unnecessary new config options

      • For example, adding vendor_username instead of using the common san_login

    • Driver reports all options it uses in get_driver_options() method

    • If the driver is a subclass of an existing driver, verify that it implements its own _update_volume_stats() function to override any capabilities of the parent driver that the child driver may not have. For example, the parent driver may support multiattach, while this may not be the case (or may not yet be verified) for the child driver.

    • Driver specific exceptions inherit from VolumeDriverException or VolumeBackendAPIException

      • Exceptions should be defined with driver code

    • Logging level is appropriate for content

      • General tracing should be at debug level

      • Things operators should be aware of should be at Info level

      • Issues that are of concern but may not have an impact on actual operation should be warning

      • Issues operators need to take action on or should definitely know about should be ERROR

      • Messages about a failure should include the snapshot or volume in question.

    • All exception messages that could be raised to users should be marked for translation with _()

    • Cryptography

      • Drivers must not use md5 for any security-related purpose. (In fact, drivers should avoid using it at all, because some security audits only allow a “yes”/”no” checkbox for md5 use … but that’s up to the vendor.)

      • Any cryptography done by a driver should be implemented by using a well-respected cryptographic library. Under no circumstances should a driver implement its own cryptographic functions.

        If the library is already in OpenStack global requirements, then it is well-respected; otherwise, you will find out if it’s well-respected when you apply for it to be added to global requirements (see next item).

    • Any additional libraries needed for a driver must be added to the global requirements.

    • Third Party CI checks

      • Responds correctly to recheck from “run-<CI Name>”

      • Tempest run console log available

      • cinder.conf and all cinder service logs available

      • LVM driver is not being configured in local.conf/cinder.conf

      • Only the driver in question should be in cinder.conf and enabled

        • default_volume_type and enabled_backends in cinder.conf, OR

        • CINDER_DEFAULT_VOLUME_TYPE and CINDER_ENABLED_BACKENDS in local.conf, OR

        • TEMPEST_VOLUME_DRIVER and TEMPEST_VOLUME_VENDER in local.conf

      • specify correct patch for each CI run

    • CI runs tox -e all -- *volume*

    • CI must run Cinder services using Python 3. More specifically:

      • At the Ussuri Virtual Mid-Cycle meeting (session 2, 16 March 2020), the Cinder team agreed that new Third-Party CI systems should:

        • ideally, test using all of the cycle Python runtimes

        • otherwise, test using at least one of the cycle runtimes

      • The current Python runtimes are determined by the OpenStack Technical Committee. See Tested Runtimes in the OpenStack governance documents.

    • CI does not report failures or exception due to the CI operation and not due to test failures due to code changes.

    • optional, but highly recommended: CI only runs on third party CI recheck trigger or on successful +1 from Zuul.

    • CI only runs on patches to the master branch unless they are intentionally set up to be able to properly run stable branch testing.

  • Included with driver patch

    • Release note stating something like “New volume driver added for Blah blah blah storage”

      • See Reno usage information here: https://docs.openstack.org/reno/latest/user/usage.html

      • Make sure that the release note is in the correct subdirectory, namely, releasenotes/notes/ in the repository root directory. It should not be located in the driver’s section of the code tree.

    • Driver added to doc/source/reference/support-matrix.ini and doc/source/reference/support-matrix.rst

    • Driver configuration information added under doc/source/configuration/block-storage/drivers

    • Update cinder/opts.py including the new driver library options using the command tox -e genopts