Re: EasyBCD and GRUB2

[S O]

Thanks for the tip, Andrey.

Thanks to it I was able to sort it out.

I ended up creating one master GRUB partitions plus BOOT+ROOT joint partition per each Linux instance.

Master GRUB partition has grub.cfg with entries like

menuentry "MyLinux1" {

    search --no-floppy --set root --label MYLINUX1

    set prefix=($root)/boot/grub

    configfile $prefix/grub.cfg

}

menuentry "MyLinux2" {

    search --no-floppy --set root --label MYLINUX2

    set prefix=($root)/boot/grub

    configfile $prefix/grub.cfg

}

and so on.

Thus GRUB is actually loaded only from master partition (which should reduce the risks of "blocklist" issues in case of backups etc.), but then menu directs it to instance-specific partition and grub.cfg in that partition. All per-instance file activity is thus contained to per-instance partition, with no headache for any possible interference between instances.

- Sergey

---

From: Andrey Borzenkov <address@hidden>
To: S O <address@hidden>
Cc: "address@hidden" <address@hidden>
Sent: Tuesday, December 25, 2012 12:18 AM
Subject: Re: EasyBCD and GRUB2

On Tue, Dec 25, 2012 at 11:41 AM, S O <address@hidden> wrote:
>
> Can someone please explain:
>
> 1) exactly how GRUB2 selects initial partition for configuration files;
>

Location of GRUB2 "home" is kept in ${prefix} variable which is stored
in core.img. It could be stored either directly or usually as
bootstrap code that looks for filesystem UUID and sets ${prefix}
accordingly.

> 2) and if there is a way to control this from boot block (in this case,
> EasyBCD-supplied boot block)?
>

GRUB2 boot block only has information about location of core.img. So
answer is - no; you only can possibly control which core.img is loaded
by dynamically patching its location into boot block. But that
effectively means "different GRUB2 instance", not "the same GRUB2 with
different configuration".

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