Re: Embedding a file into core.img

[Arbiel (gmx)]

Hi

I try to record in the MBR of USB keys an autonomous MBR (no support of 
any other directory or file) to boot a PC with the system located on a 
partition whose name is predefined "cielos", and in case this fails, to 
chainload to the hd0's MBR.

I've understood from Grub's Manual that to achieve such a goal, I have 
to embed the file using option -c of grub-mkimage.

I have now modified the --grub-mkimage option to point to the shell 
script which creates /media/maisonnette/grub/core.img and from there I 
have been able to imbed the file and launch a boot process. However, 
this process failed, with a "no such device : the uuid I used in my 
search.fs_uuid command" whereas such a device exists on my external device

The imbedded file reads

search.fs_uuid 0aceef09-a694-4105-bade-2dca95a09a08 root
set prefix=(root)/boot/grub

and a sudo blkid | grep 0aceef09-a694-4105-bade-2dca95a09a08 responds

/dev/sdb5: LABEL="cielos" UUID="0aceef09-a694-4105-bade-2dca95a09a08" 
TYPE="ext4"

I try to understand why the search fails.

Le 20/03/2013 04:18, Andrey Borzenkov a écrit :
> В Wed, 20 Mar 2013 00:15:07 +0100
> "Arbiel (gmx)" <address@hidden> пишет:
>
> > Hi
> >
> > I'm trying to embed a file into core.img. I followed instructions from
> > GNU Grub Manual's 5.4 Embedding a configuration file into Grub and tried
> > to replicate the example given there with a config file figuring two lines
> >
> >        search.fs_uuid the_uuid_of_my_partition root
> >        set prefix=($root)/boot/grub
> >
> >
> > I used the following commands
> >
> > #! /bin/bash
> > cd "${1}"
> > cat 1> grub/embed.cfg <<EOF
> > search.fs_uuid 0aceef09-a694-4105-bade-2dca95a09a08 root
> > set prefix=($root)/boot/grub
> > EOF
> > sudo grub-mkimage -c 'grub/embed.cfg' -o 'grub/grub-image' -O i386-pc -d
> > '/usr/lib/grub/i386-pc' -C none search_fs_uuid
>
> -O and -d together are redundant.
>
> > sudo chmod +x 'grub/grub-image'
> > sudo grub-install --boot-directory=/media/maisonnette
> > --grub-mkimage=grub/grub-image /dev/sdb 2>grub/msg.log
>
> --grub-mkimage points to program to create image, not to image itself.
>
> You do not explain what you attempt to achieve. May be using grub-rescue
> to build ISO image that includes full grub and can optionally include
> arbitrary files would be easier?
>
> > I get the following error message
> >
> > grub/grub-image: 1: grub/grub-image: Syntax error: word unexpected
> > (expecting ")")
> >
> > Can anybody tell me what's wrong, knowing that my partition
> > /media/maisonnette has nothing to do with the
> > 0aceef09-a694-4105-bade-2dca95a09a08 partition.
> >
> > Thank you
> >
> > I used the following command
> >
> >
> >
> >
> >
> > _______________________________________________
> > Help-grub mailing list
> > address@hidden
> > https://lists.gnu.org/mailman/listinfo/help-grub