[Bug 2065155] [NEW] os-prober ignores grub devicetree statement

[Juerg Haefliger]

Public bug reported:

os-prober doesn't recognize a grub devicetree statement which results in
an unbootable grub entry.

I.e. from /boot/grub/grub.cfg on /dev/nvme0n1p5:

menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-ddc4f4b5-4f16-419d-aa64-50bbafcc93ae' {
        recordfail
        load_video
        gfxmode $linux_gfx_mode
        insmod gzio
        if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
        insmod part_gpt
        insmod ext2
        search --no-floppy --fs-uuid --set=root ddc4f4b5-4f16-419d-aa64-50bbafcc93ae
        linux   /boot/vmlinuz-6.8.0-31-generic root=UUID=ddc4f4b5-4f16-419d-aa64-50bbafcc93ae ro  clk_ignore_unused pd_ignore_unused arm64.nopauth 
        initrd  /boot/initrd.img-6.8.0-31-generic
        devicetree      /boot/dtb-6.8.0-31-generic
}

But os-prober (running from /dev/nvme0n1p6) constructs the following
(missing devictree line):

menuentry 'Ubuntu 23.10 (23.10) (on /dev/nvme0n1p5)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-ddc4f4b5-4f16-419d-aa64-50bbafcc93ae' {
        insmod part_gpt
        insmod ext2
        search --no-floppy --fs-uuid --set=root ddc4f4b5-4f16-419d-aa64-50bbafcc93ae
        linux /boot/vmlinuz-6.8.0-31-generic root=UUID=ddc4f4b5-4f16-419d-aa64-50bbafcc93ae ro clk_ignore_unused pd_ignore_unused arm64.nopauth
        initrd /boot/initrd.img-6.8.0-31-generic
}

** Affects: os-prober (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2065155

Title:
  os-prober ignores grub devicetree statement

Status in os-prober package in Ubuntu:
  New

Bug description:
  os-prober doesn't recognize a grub devicetree statement which results
  in an unbootable grub entry.

  I.e. from /boot/grub/grub.cfg on /dev/nvme0n1p5:

  menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-ddc4f4b5-4f16-419d-aa64-50bbafcc93ae' {
          recordfail
          load_video
          gfxmode $linux_gfx_mode
          insmod gzio
          if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
          insmod part_gpt
          insmod ext2
          search --no-floppy --fs-uuid --set=root ddc4f4b5-4f16-419d-aa64-50bbafcc93ae
          linux   /boot/vmlinuz-6.8.0-31-generic root=UUID=ddc4f4b5-4f16-419d-aa64-50bbafcc93ae ro  clk_ignore_unused pd_ignore_unused arm64.nopauth 
          initrd  /boot/initrd.img-6.8.0-31-generic
          devicetree      /boot/dtb-6.8.0-31-generic
  }

  But os-prober (running from /dev/nvme0n1p6) constructs the following
  (missing devictree line):

  menuentry 'Ubuntu 23.10 (23.10) (on /dev/nvme0n1p5)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-ddc4f4b5-4f16-419d-aa64-50bbafcc93ae' {
          insmod part_gpt
          insmod ext2
          search --no-floppy --fs-uuid --set=root ddc4f4b5-4f16-419d-aa64-50bbafcc93ae
          linux /boot/vmlinuz-6.8.0-31-generic root=UUID=ddc4f4b5-4f16-419d-aa64-50bbafcc93ae ro clk_ignore_unused pd_ignore_unused arm64.nopauth
          initrd /boot/initrd.img-6.8.0-31-generic
  }

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