Enable GRUB UKI menu entries

[codefiles]

No description provided.

[codefiles]

A problem here is if more than one kernel is installed there will be multiple "Arch Linux" entries in the menu with the edit option being the only way to distinguish them.

The menu title comes from the PRETTY_NAME in .osrel, see grub-core/commands/blsuki.c:

  /*
   * Although .osrel is listed as optional in the UKI specification, the .osrel
   * section is needed to generate the GRUB menu entry title.
   */
  osrel = blsuki_get_val (entry, ".osrel", NULL);
  if (osrel == NULL)
    {
      grub_dprintf ("blsuki", "Skipping file %s with no '.osrel' key.\n", entry->filename);
      goto finish;
    }

  osrel_line = osrel;
  while ((key = uki_read_osrel (&osrel_line, &value)) != NULL)
    {
      if (grub_strcmp ("PRETTY_NAME", key) == 0)
	{
	  title = value;
	  break;
	}
    }

This could be alleviated by using recall previous entry with the addition of the following command.

grub-editenv /boot/grub/grubenv set blsuki_save_default=true

[svartkanin]

I suppose that's fine for now and we can improve that in the future