Comment 6 for bug 1821872

Reviewed: https://review.opendev.org/c/x/microstack/+/788360
Committed: https://opendev.org/x/microstack/commit/c74223de0a157688a507d58b1192a8060500b946
Submitter: "Zuul (22348)"
Branch: master

commit c74223de0a157688a507d58b1192a8060500b946
Author: Billy Olsen <email address hidden>
Date: Fri Mar 19 15:45:05 2021 -0700

    Fix aarch64/arm64 support for MicroStack

    Fix the builds for MicroStack on aarch64/arm64. To resolve the build
    issues, the SNAP_ARCH and SNAP_ARCH_TRIPLET variables need to be used
    in appropriate places to reference the underlying platform rather than
    the x86_64 platform.

    Arm64/Aarch64 support requires that EFI support is enabled, which
    involves adding the EFI packages for arm64. These are also included for
    x86_64 for ensuring consistency in EFI support between the
    architectures. The /usr/share/{OVMF,AAVMF} paths need to be bind-mounted
    to the appropriate locations to avoid having to custom build the
    packages within the snap.

    The setup sequence also needs to consider loading the right image into
    glance. This is done by using the platform to determine which cirros
    image to import into glance. A new cirros image was not included in this
    patch for aarch64 platform in order to keep the snap image size lower.
    The setup sequence has fallback code to attempt to download the image if
    it is unavailable in the filesystem.

    Finally, the snapcraft architectures for building microstack are limited
    to the x86_64 and arm64 platforms. There's no need to build on s390x or
    other architectures at this point.

    Closes-Bug: #1821872

    Change-Id: I26625621fb9895027139ecb895e882e60f2e6502