[Bug 1969841] Re: grub-efi-amd64: grub-efi/install_devices depends on the value of LC_COLLATE/LANG

[Julian Andres Klode]

** Package changed: linux-meta (Ubuntu) => grub2 (Ubuntu)

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Title:
  grub-efi-amd64: grub-efi/install_devices depends on the value of
  LC_COLLATE/LANG

Status in grub2 package in Ubuntu:
  New

Bug description:
  Hi,
  As discussed with Julian Andres Klode on IRC, there are cases where the value of grub-efi/install_devices is affected by the value of LC_COLLATE.

  This is caused by this unique sort: https://git.launchpad.net/~ubuntu-
  core-dev/grub/+git/ubuntu/tree/debian/grub-multi-
  install?h=debian/2.06-2ubuntu7#n220

  # lsb_release -rd
  Description:	Ubuntu 22.04 LTS
  Release:	22.04

  From what I see, this can only happen on systems with NVMe drives:

  # find -L /dev/disk/by-id/ -samefile /dev/nvme0n1p1
  /dev/disk/by-id/nvme-eui.e8238fa6bf530001001b44455555555-part1
  /dev/disk/by-id/nvme-WDC_CL_SN720_SDAQNTW-512G-2000_xxxx-part1

  Let's assume grub-efi/install_devices has the following value:

  # debconf-show grub-efi-amd64 | grep grub-efi/install_devices:
  * grub-efi/install_devices: /dev/disk/by-id/nvme-WDC_CL_SN720_SDAQNTW-512G-2000_xxxx-part1, /dev/disk/by-id/nvme-WDC_CL_SN720_SDAQNTW-512G-2000_yyyy-part1

  This was obtained with this LANG/LC_COLLATE:
  # echo $LANG
  C.UTF-8
  # dpkg-reconfigure grub-efi-amd64
  │ GRUB EFI system partitions:                                                            │
  │                                                                                        │
  │    [*] /dev/nvme1n1p1 (535 MB; /boot/efi) on 512110 MB WDC CL SN720 SDAQNTW-512G-2000  │
  │    [*] /dev/nvme0n1p1 (535 MB; ) on 512110 MB WDC CL SN720 SDAQNTW-512G-2000           │
  # debconf-show grub-efi-amd64 | grep grub-efi/install_devices:
  * grub-efi/install_devices: /dev/disk/by-id/nvme-WDC_CL_SN720_SDAQNTW-512G-2000_xxxx-part1, /dev/disk/by-id/nvme-WDC_CL_SN720_SDAQNTW-512G-2000_yyyy-part1

  We can see that the boxes are properly ticked here.

  However:
  # export LANG=en_US.UTF-8; dpkg-reconfigure grub-efi-amd64
  │ GRUB EFI system partitions:                                                             │
  │                                                                                         │
  │    [ ] /dev/nvme1n1p1 (535 MB; /boot/efi) on 512110 MB WDC CL SN720 SDAQNTW-512G-2000   │
  │    [ ] /dev/nvme0n1p1 (535 MB; ) on 512110 MB WDC CL SN720 SDAQNTW-512G-2000            │

  The boxes are not ticked, if I tick them, I get the following:

  # debconf-show grub-efi-amd64 | grep grub-efi/install_devices:
  * grub-efi/install_devices: /dev/disk/by-id/nvme-eui.e8238fa6bf530001001b44455555555-part1, /dev/disk/by-id/nvme-eui.e8238fa6bf530001001b44666666-part1

  I assume the postinst script for grub-pc exhibits the same bug with
  the value of grub-pc/install_devices.

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