Comment 2 for bug 2070080

Reviewed: https://review.opendev.org/c/openstack/python-openstackclient/+/923169
Committed: https://opendev.org/openstack/python-openstackclient/commit/205bac3caf5ff983c60da0d171e51c1cc286024a
Submitter: "Zuul (22348)"
Branch: master

commit 205bac3caf5ff983c60da0d171e51c1cc286024a
Author: Rajat Dhasmana <email address hidden>
Date: Mon Jul 1 21:04:45 2024 +0530

    Fix: incremental volume backup

    The incremental volume backup stopped working after we moved from
    cinderclient to SDK[1]. This happened because SDK accepts the
    ``is_incremental`` parameter[2] rather than the ``incremental`` parameter
    which is actually passed in the API request and was previously a valid
    parameter for cinderclient.

    This patch fixes the issue by passing the ``is_incremental`` field instead
    of ``incremental`` from the OSC side which adds the ``incremental`` parameter
    in the API request.

    Request body after the fix:

    '{"backup": {"name": null, "description": null, "volume_id": "<vol-id>",
    "force": false, "container": null, "incremental": true}}'

    [1] https://review.opendev.org/c/openstack/python-openstackclient/+/889748
    [2] https://opendev.org/openstack/openstacksdk/src/commit/10e5e20fc0eb5264080f0cfdc0523d65883dc693/openstack/block_storage/v2/backup.py#L126-L134

    Closes-Bug: #2070080
    Change-Id: I89bd3d2751267ec39f4dbd664b7873ab87a9ac6c