Re: grub 1.99 configuration

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 24.06.2011 04:18, Bruce Dubbs wrote:
> Vladimir 'φ-coder/phcoder' Serbinenko wrote:
>> On 12.06.2011 04:28, Bruce Dubbs wrote:
>>> I'm trying to manually run grub-mkconfig to establish grub-1.99
>>> installation instructions for Linux From Scratch.
>>>
>>> I am getting:
>>>
>>> grub-mkconfig -o /boot/grub/grub.cfg
>>>   /usr/sbin/grub-probe: error: cannot stat `/dev/root'
>>>
>>> Doing some investigating grub-mkconfig is running:
>>>   /usr/sbin/grub-probe --target=device /
>>>
>>> Drilling down, grub-probe is doing:
>>>   device_name = grub_guess_root_device (path);
>>>
>>> Which in turn is doing:
>>>   grub_find_root_device_from_mountinfo( "/", NULL );
>>>
>>> This is reading /proc/self/mountinfo.  The problem here is that this
>>> file does not give the device, but specifies /dev/root:
>>>
>>> 13 1 8:15 / / rw,relatime - ext3 /dev/root
>>> rw,errors=continue,barrier=0,data=writeback
>>>
>>> The kernel is 2.6.39.1, but 2.6.37 seems to give the same thing.
>>> grub-probe should be able to detect /dev/sda15, but fails on newer
>>> kernels.
>>>
>>> grub-probe for grub-1.98 works fine.  A grep there shows no use of
>>> /proc/self/mountinfo.
>>>
>>> Suggestions?
>>>
>> update either udev or grub. normally /dev/root should be a symlink.
>> Newer grub-probe can cope with some other arrangements as well
>
> Well I'm using udev-171.  That is the most recent version.  We don't
> like to non-release package versions in LFS, but we do occasionally
> patch files.
>
> I don't know when /dev/root became a 'device'.  Udev doesn't create
> it.  We also don't use an initrd.  That's not needed when you know in
> advance what your hardware configuration is.
>
> I did work around the problem by manually creating the symlink.  I do
> not know of anything other than GRUB that needs it, but I don't use lvm.
>
> In any case, I don't think GRUB should choke because /dev/root is
> missing.
>
it's fixed now but handling these cases requires to scan /dev to find
the matching device based on major/minor pair which is slower, sometimes
much slower.
>   -- Bruce
>
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-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko

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