[Bug 2007827] [NEW] flash-kernel failure when upgrading f-k anad kernel in the same cycle

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[Impact]
In version 3.104ubuntu15 of flash-kernel, when both f-k and the kernel are upgraded in the same cycle, depending on the ordering of dpkg trigger execution, f-k may find the content of /boot "inconsistent" causing it to fail and return error exit status 1.

Erorr message:
Processing triggers for man-db (2.10.2-1) ...
Processing triggers for flash-kernel (3.104ubuntu15) ...
flash-kernel: installing version 5.15.0-1018-xilinx-zynqmp
Initrd required for FIT method
dpkg: error processing package flash-kernel (--configure):
 installed flash-kernel package post-installation script subprocess returned error exit status 1
Processing triggers for linux-image-5.15.0-1018-xilinx-zynqmp (5.15.0-1018.20) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-5.15.0-1018-xilinx-zynqmp

flash-kernel gets the latest kernel version by "linux-version list".
When flash-kernel was triggered to generate fitimage, the kernel version is "5.15.0-1018" and the initrd for it wasn't ready. So, flash-kernel failed to generate the fitimage.

A subsequent run of "apt install -f" fixed things because, by that
point, the kernel's own trigger had executed, ensuring that update-
initramfs had been run. In the case that f-k is run "prematurely" and
finds itself in this situation (/boot/kernel-$[ver} exists, but
/boot/initrd-${ver}) doesn't), it should probably bail out silently
under the assumption that whatever is responsible for it will rectify
the situation and trigger f-k again (as happens in the kernel postinst
hooks).

[Test Case]
1. Flash an old image (with an out of date kernel and flash-kernel)
2. sudo apt-get update
3. sudo apt install flash-kernel with the fix and linux packages
4. Upgrade should proceed without issue

[Regression Potential]
As with the previous flash-kernel uploads, it is possible that a breakage in the changed code can lead to issues with upgrading kernels (due to f-k being executed via a trigger at the end) or with Xilinx devices in the field not upgrading correctly. I will test all the changes extensively though.

Related issues:
LP: #1861292 flash-kernel failure during kernel upgrade

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


** Tags: oem-priority originate-from-2003041 patch
-- 
flash-kernel failure when upgrading f-k anad kernel in the same cycle
https://bugs.launchpad.net/bugs/2007827
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