Comment 2 for bug 1977557

Reviewed: https://review.opendev.org/c/starlingx/distcloud/+/844629
Committed: https://opendev.org/starlingx/distcloud/commit/388b82609185479bc7aae8cda70c0784d5a465a7
Submitter: "Zuul (22348)"
Branch: master

commit 388b82609185479bc7aae8cda70c0784d5a465a7
Author: Gabriel Silva Trevisan <email address hidden>
Date: Fri Jun 3 14:41:24 2022 -0300

    Clean up subcloud iso path on remote reinstall

    When remote installing a subcloud after an abrupt termination on a
    previous attempt (e.g.: uncontrolled swact, service restart), a failure
    might occur on gen-bootloader-iso script, due to a remaining ISO
    directory still being present for the subcloud.

    Clean up ISO path for the subcloud to make sure it is empty before
    calling the script.

    Test Plan:

    PASS:
    - Reinstall subcloud with an existing directory in ISO path and make
      sure installation removes it before proceeding.
    - Reinstall subcloud after previous attempt abruptly terminates due to
      service restart.
    - Reinstall subcloud after previous attempt abruptly terminates due to
      host swact.
    - Reinstall two subclouds in parallel after abrupt termination and
      ensure cleanups only delete their respective subcloud directories.

    Closes-bug: 1977557

    Signed-off-by: Gabriel Silva Trevisan <email address hidden>
    Change-Id: I504dd108d6654294a3bbe9747d6aee0a0cec97be