Re: search by PARTUUID

[Pascal Hambourg]

Le 12/04/2018 à 09:17, Urs Ritzmann a écrit :
> > From: Pascal Hambourg [mailto:address@hidden
> >
> > Le 11/04/2018 à 10:00, Urs Ritzmann a écrit :
> > > Currently, the filesystem UUID is used in the search. It works, but the fs UUID 
> > > has to be updated after an image update which is a bit
> > ugly. A constant PARTUUID pointing to current image would be more clean.
> >
> > Can't the same UUID be used when creating a new image ?
>
> The same image can be installed to different partitions (e.g. in a fail-safe 
> dual-copy approach, the currently active image always updates another, inactive 
> image, then toggles the boot to the new one).
>
> In case the same image is installed twice (to different partitions), I would 
> end up with both images having the same UUID.

And that would be a bad thing, because UUIDs are supposed to be unique. 
You wrote that rewriting the filesystem UUID was a bit ugly, but IMO not 
doing it and having duplicate UUIDs is much more ugly.

Looking at the grub-devel mailing list archives, I found out that some 
patches have been submitted to add support for partition UUIDs in GRUB. 
But I don't know their status nor whether that is exactly the kind of 
support that you are looking for. IIUC, the submitter seemed more 
interested in using PARTUUID in the Linux kernel root parameter than in 
search commands.