Comment 25 for bug 1690185

Reviewed: https://review.openstack.org/536298
Committed: https://git.openstack.org/cgit/openstack/ironic-specs/commit/?id=08b5820be460dd0d8de12126eeb6c04dcc6a0eed
Submitter: Zuul
Branch: master

commit 08b5820be460dd0d8de12126eeb6c04dcc6a0eed
Author: Dmitry Tantsur <email address hidden>
Date: Mon Jan 22 11:35:11 2018 +0100

    Future of classic drivers: update the migration proposal

    As I started working on the migration implementation, it became
    apparent that the current proposal is not the best. This patch
    makes the following changes:

    1. Do not calculate migration per node, but rather per driver. Doing
       it per node is not required for the current classic drivers.
       It complicates the database code and makes it potentially less
       efficient, because we need to fetch and update every node
       separately.

    2. Return hardware type and interfaces separately from to_hardware_types.
       Also return interfaces without _interface suffix. This simplifies
       additional checks in the migration code.

    3. Add support for options in migrations, and add an option to reset
       unsupported interfaces to no-<interface>. This is needed to make
       this migration more usable. For example, for ``pxe_ipmitool``
       to be migrated under the current proposal, a deployment must have
       ``agent`` RAID and ``shellinabox`` console enabled, even if it
       does not use and/or does not support them. The new options will
       allow such deployments to have unsupported interfaces reset.

    Change-Id: I194be98bdd1f307ce6b9054a0037788f81cb0d23
    Related-Bug: #1690185