From mboxrd@z Thu Jan  1 00:00:00 1970
From: Danny Milosavljevic <dannym@scratchpost.org>
Subject: bug#27735: Lookup by UUID
Date: Thu, 20 Jul 2017 19:38:01 +0200
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To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: 27735@debbugs.gnu.org

Hi Ludo,

> With iso9660, it works=E2=80=A6 by chance, because GRUB=E2=80=99s =E2=80=
=9Csearch --fs-uuid=E2=80=9D
> fails.  Guess why?  Because it compares UUIDs as strings, and we format
> it as a DCE UUID instead of an ISO UUID.  Sounds familiar no?  :-)

Yeah :)

> So that=E2=80=99s where we are.  Thoughts on how to address it?

https://www.gnu.org/software/grub/manual/grub.html#Making-a-GRUB-bootable-C=
D_002dROM says:

>...grub-mkrescue
>This produces a file named grub.iso, which then can be burned into a CD (o=
r a DVD), or written to a USB mass storage device.
>The root device will be set up appropriately on entering your grub.cfg con=
figuration file, so you can refer to file names on the CD without needing t=
o use an explicit device name. This makes it easier to produce rescue image=
s that will work on both optical drives and USB mass storage devices.=20

So... just leave the entire "search" instruction off if it's created by gru=
b-mkrescue ?  That's how one could interpret thir "root device" sentence...