[Bug 1626848] [NEW] flash-kernel postrm.d script fails on kernel removal

[Robert C Jennings]

Public bug reported:

Context: livecd-rootfs build for ARM64 ubuntu images using the linux-
generic kernel

What changed: linux-image-generic-extra-* came into being and now linux-
image-generic-* depends on it.  When removed the zz-flash-kernel hook
for the kernel runs twice (postinst.d and postrm.d)

What happened:
 - Creating a container image (LXD, ...) livecd-rootfs starts with a server image with a kernel and removes the kernel.
 - The kernel postinst.d hook for flash-kernel (zz-flash-kernel) runs twice now (first for postinst and then for postrm).  On the second call there is no kernel installed and flash-kernel does not handle being called with no kernel present; the kernel removal operation fails at this point.

Looking for a solution where zz-flash-kernel/flash-kernel is tolerant of
this behavior such that kernel removal is possible.

** Affects: flash-kernel (Ubuntu)
     Importance: Critical
         Status: New

** Attachment added: "arm64_livecd-rootfs_flash-kernel.failure"
   https://bugs.launchpad.net/bugs/1626848/+attachment/4746704/+files/arm64_livecd-rootfs_flash-kernel.failure

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https://bugs.launchpad.net/bugs/1626848

Title:
  flash-kernel postrm.d script fails on kernel removal

Status in flash-kernel package in Ubuntu:
  New

Bug description:
  Context: livecd-rootfs build for ARM64 ubuntu images using the linux-
  generic kernel

  What changed: linux-image-generic-extra-* came into being and now
  linux-image-generic-* depends on it.  When removed the zz-flash-kernel
  hook for the kernel runs twice (postinst.d and postrm.d)

  What happened:
   - Creating a container image (LXD, ...) livecd-rootfs starts with a server image with a kernel and removes the kernel.
   - The kernel postinst.d hook for flash-kernel (zz-flash-kernel) runs twice now (first for postinst and then for postrm).  On the second call there is no kernel installed and flash-kernel does not handle being called with no kernel present; the kernel removal operation fails at this point.

  Looking for a solution where zz-flash-kernel/flash-kernel is tolerant
  of this behavior such that kernel removal is possible.

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