[Bug 2038957] Re: ppcel64 images unpack to /boot/vmlinux not /boot/vmlinuz leading to kernel feature mismatch

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/453306

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https://bugs.launchpad.net/bugs/2038957

Title:
  ppcel64 images unpack to /boot/vmlinux not /boot/vmlinuz leading to
  kernel feature mismatch

Status in livecd-rootfs package in Ubuntu:
  Fix Committed

Bug description:
  In a build of a ppcel64 image, snap_validate_seed fails to find the
  installed kernel to pick a matching apparmor feature set to mount.
  from the log

  ```
  + [ -e chroot/boot/vmlinuz ]
  + [ -e chroot/var/lib/snapd/seed/seed.yaml ]
  + snap debug validate-seed chroot/var/lib/snapd/seed/seed.yaml
  + realpath chroot
  + /usr/lib/snapd/snap-preseed --reset /build/chroot
  ubuntu classic preseeding
  unmounting: /build/chroot/tmp/snapd-preseed
  ubuntu classic preseeding
  unmounting: /tmp/snapd-preseed
  + realpath chroot
  + /usr/lib/snapd/snap-preseed /build/chroot
  ubuntu classic preseeding
  ```

  This corresponds to line 772 in livecd-rootfs/live-build/functions

  snap_validate_seed() {
      local CHROOT_ROOT=$1
      local kern_major_min=undefined

      if [ -e ${CHROOT_ROOT}/boot/vmlinuz ]; then

  ppcel64 however unpacks to /boot/vmlinux. For history:

  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1358920

  for ppcel64 images, this function needs to be updated to check for
  `/boot/vmlinux`.

  This will require an SRU 23.10 (post-release) and 22.04

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