Comment 11 for bug 1890798

Reviewed: https://review.opendev.org/746533
Committed: https://git.openstack.org/cgit/openstack/tripleo-common/commit/?id=70b1ca4b1cee3813ee49cd71d8e16b9337ad11fd
Submitter: Zuul
Branch: stable/ussuri

commit 70b1ca4b1cee3813ee49cd71d8e16b9337ad11fd
Author: Emilien Macchi <email address hidden>
Date: Mon Aug 10 14:12:53 2020 -0400

    (backward compatibility) create kolla UIDs/GIDs for TCIB

    When upgrading container images from Kolla-based to TCIB-based, the
    config files can't be read if we don't apply the new chown values unless
    we re-use the same UIDs/GIDs as we had with Kolla; which is what we'll
    do for now until we figure out an easy way to update config permissions
    during the upgrade/update stage.

    This introduces a new script, that will be injected in the base layer:

    uid_gid_manage.sh

    Usage:

    ./uid_gid_manage.sh qemu nova

    It'll first create the qemu user/group, then nova user/group.
    The format aims to be simple:

    <username> <uid> <gid> <optional homedir> <optional list of extra groups>

    It's also removing instances of usermod which aren't needed anymore;
    since we create the user / groups only in the images where they are
    needed; which wasn't the case for Kolla where all users/groups were
    created in the base image.

    Note: we create the user/group before installing packaging so if
    packaging creates directories and sets permissions, it'll be with the
    right UID/GID (unless packaging overrides UID/GID but rarely do it).

    Related-Bug: #1890798

    Change-Id: If3fa2ff34af42a7438c6dbf81dbcb0bddd63afa6
    (cherry picked from commit fb0ec2ffd0a99d441c361bb83472e48ead18d013)