Re: Having the configuration file embedded into core.img look for the grub partition by its label

[Arbiel Perlacremaz <arbiel.perlacremaz@gmx.fr>]

Le 23/09/2014 18:37, Andrei Borzenkov a écrit :
> В Tue, 23 Sep 2014 10:11:21 +0200
> Arbiel Perlacremaz <arbiel.perlacremaz@gmx.fr> пишет:
>
>> Having the grub directory on the external device is not what I'm looking
>> for.
>>
>> I indeed use several external devices and I've installed GRUB on each of
>> them so that it is always available, whatsoever my configuration is. To
>> avoid confusion when updating GRUB, all my fstab files mount a unique
>> directory, always the same, on /boot/grub. This is the reason why I want
>> GRUB on my hard drive.
>>
> Well, use grub-mkimage then; you are completely free in adding your own
> embedded config file.
>
In using Ubuntu 14.04 LTS, I don't know which grub version I'm presently
using, as the -v parameter don't mean "print the version information"
any longer, but "print verbose messages".
In reviewing grub-install parameters, I did not find any one allowing
for the incorporating a user-generated grub image. Nor don't I know how
to use grub-mkimage to generate such an image. However, I tried the
--force-file-id parameter and as a result of this, I got what I am
looking for.

bootinfoscript outputs the following

============================= Boot Info Summary:
===============================

 => Windows 7/8/2012 is installed in the MBR of /dev/sda.
 => Grub2 (v2.00) is installed in the MBR of /dev/sdb and looks at
sector 1 of
    the same hard drive for core.img. core.img is at this location and
looks
    for / and uses an embedded config file:
   
   
---------------------------------------------------------------------------
    search.file /uuid/2nk2euatog5bddbaf30io4hb root hd0,msdos2
    set prefix=($root)'/'
    
It's even better than what I expected as a user probably never will
change the names of this grub-install generated directory and file .
>> Le 23/09/2014 01:09, Vladimir 'φ-coder/phcoder' Serbinenko a écrit :
>>> On 22.09.2014 22:49, Arbiel Perlacremaz wrote:
>>>> Hi
>>>>
>>>> A way I'm using to avoid any Window's reinstallation to overwrite GRUB
>>>> in a multiboot environment is to install the later on the MBR of a USB
>>>> key. That way, when booting with no key pluged, the PC boots into
>>>> Windows and when booting with the key pluged, the PC boots according to
>>>> the choice of the user in the grub menu's.
>>>>
>>>> I do locate the grub.cfg file in a partition of the internal hard drive.
>>>> In such a situation, grub-install embeddes a config file which reads
>>>> something like
>>>>
>>>>     search.fs_uuid 367C9BBD7C9B75F9 root hd0,msdos1
>>>>     set prefix=($root)'/'
>>>>
>>>> This is great.
>>>>
>>>> However, any undesired modification by any piece of software of the
>>>> partition's uuid will prevent GRUB to find it and lead to a boot
>>>> failure. As the Windows partition is less prone to such modifications as
>>>> Linux partitions, I do locate the grub.cfg file in that Windows
>>>> partition. However it would be more straightforward to locate the file
>>>> into a Linux partition, and to have grub search this partition by its label.
>>>>
>>>> How could this be done ? If this can't presently be done, can it be
>>>> included in a future grub release ?
>>> use --boot-directory to place all files on usb stick and make it load
>>> any other grub.cfg you might want.
>>>> Regards
>>>>
>>>> Arbiel
>>>>
>>>> _______________________________________________
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>>>> Grub-devel@gnu.org
>>>> https://lists.gnu.org/mailman/listinfo/grub-devel
>>>>
>>>
>>>
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