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Re: grub-setup inflexibility

From: Vladimir 'φ-coder/phcoder' Serbinenko
Subject: Re: grub-setup inflexibility
Date: Thu, 18 Nov 2010 03:28:08 +0100
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On 09/16/2010 04:02 AM, Joey Korkames wrote:
> [UTF-8]Vladimir 'Æ-coder/phcoder' Serbinenko writes:
>> On 09/15/2010 08:55 PM, Joey Korkames wrote:
>>> Colin Watson writes:
>>>> On Xen (I'm told), it's possible to assign disk images in the host to
>>>> things that are named rather like partitions in the guest (e.g.
>>>> /dev/sda1), but that don't have an associated disk (e.g. /dev/sda);
>>>> indeed, the latter device is nonexistent.  This confuses
>>>> grub_util_biosdisk_get_grub_dev.
>>>> There's really no other situation in which I think it's terribly
>>>> plausible that you might have /dev/sda1 but not /dev/sda, so it
>>>> seems to
>>>> me that in this case we can reasonably treat the apparent
>>>> "partition" as
>>>> a disk in its own right.
>>> Can we make some of these 'decisions' switchable on the command line?
>>> I perform a lot of block device redirections (Xen, iSCSI, nbd, etc) or
>>> work from live cd's (where / is merely rootfs+unionfs with no disk,
>>> but /boot is a mounted disk), and grub-setup raises fatal objections
>>> that I would like to override when _I_ know what devnodes the
>>> bootblocks and the filesystems belong on.
>> It looks like you confused grub-setup (called from grub-install) with
>> grub-mkconfig (called from update-grub). Former accesses only to
>> /boot/grub and it needs to know about /boot/grub in order to configure
>> image correctly.
> Nope, I really do mean grub-setup. The situations I described also
> confuses
> grub-install and grub-mkconfig's sh functions, but I generate my own
> configs so I don't use those.
> I was looking at the grub-setup code and just saw a new option,
> --skip-fs-probe . I'll try that for the livecd edge case and if that
> doesn't fix my problems, then I'll try to get a detailed breakpoint
> where grub-setup gets confused.
I've successfully installed GRUB from Ubuntu live CD both using Ubuntu
version and trunk version with root on aufs and /boot being a mounted
/dev/sda1 device. It doesn't seem to be any problem. IF problem persists
for you please supply additional data including the output of
sh -x grub-install --root-directory=.. /dev/sdXY
> _______________________________________________
> Grub-devel mailing list
> address@hidden

Vladimir 'φ-coder/phcoder' Serbinenko

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