[Bug 2041827] Re: update-grub sorts custom kernel below older/lower package kernels

[Julian Andres Klode]

Thank you for your bug report! This was quite a doozy.

Yes, this happens because your version number is missing a - and the
script doesn't extract versions from the filenames, hence APT ends up
parsing the version as

upstream: vmlinuz, revision: 6.6.0

whereas versions with a - in it like official ones are parsed as e.g.:

upstream: vmlinuz-6.5.0-10, revision: generic


** Changed in: grub2 (Ubuntu)
   Importance: Undecided => Low

** Changed in: grub2 (Ubuntu)
       Status: New => Triaged

** Also affects: grub2 (Ubuntu Mantic)
   Importance: Undecided
       Status: New

** Also affects: grub2 (Ubuntu Noble)
   Importance: Low
       Status: Triaged

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Title:
  update-grub sorts custom kernel below older/lower package kernels

Status in grub2 package in Ubuntu:
  Triaged
Status in grub2 source package in Mantic:
  New
Status in grub2 source package in Noble:
  Triaged

Bug description:
  Since the upgrade to 23.10 my custom built kernels do not sort on top
  of grub menu anymore, even though their number is higher than the
  packaged kernels:

  See the output of grub-sort-version -r for the default kernel list on
  my system, as constructed by /etc/grub.d/10_linux

  # for i in /boot/vmlinuz-* /vmlinuz-* /boot/kernel-* ; do echo $i; list="$list $i"; done
  /boot/vmlinuz-6.5.0-10-generic
  /boot/vmlinuz-6.5.0-9-generic
  /boot/vmlinuz-6.5.8
  /boot/vmlinuz-6.5.9
  /boot/vmlinuz-6.6.0
  /vmlinuz-*
  /boot/kernel-*

  # echo $list | tr ' ' '\n' | sed -e 's/\.old$/ 1/; / 1$/! s/$/ 2/' | /usr/lib/grub/grub-sort-version -r | sed -e 's/ 1$/.old/; s/ 2$//'
  /vmlinuz-*
  /boot/vmlinuz-6.5.0-10-generic
  /boot/vmlinuz-6.5.0-9-generic
  /boot/vmlinuz-6.6.0              <!--- Used to be on top before 23.10
  /boot/vmlinuz-6.5.9
  /boot/vmlinuz-6.5.8
  /boot/kernel-*

  As can be seen from the output, /boot/vmlinuz-6.5.0-10-generic sorts
  above /boot/vmlinuz-6.6.0 which is a regression compared to 23.04

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