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Re: Understanding Grub2

From: sashab
Subject: Re: Understanding Grub2
Date: Mon, 16 Apr 2018 05:58:51 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

Hi Richard,

On 15/04/18 23:34, Richard Owlett wrote:
> On 04/15/2018 09:16 AM, Goh Lip wrote:
>> On 15/04/18 20:58, Richard Owlett wrote:
>>> a MBR BIOS is used.
>>> I wish to dedicate the first partition to Grub
>> Assuming partition is sda1, from any working grub 2 bios-legacy OS in
>> your computer.
>> sudo mount /dev/sda1 /mnt
>> sudo grub-install --boot-directory=/mnt/boot /dev/sda
>> Then put in your grub.cfg in sda1/boot/grub/grub.cfg (or
>> /boot/grub2/grub.cfg if applicable)
> I did that.
> When booting that device, I got the expected grub command line.
> I am now investigating what my grub.cfg should look like.
> I am reading several references listed at
> especially
> I suspect that
>   grub-mkconfig -o /boot/grub/grub.cfg
> will do what I need.
> There is a reference to
> which has references to /etc/grub.d  and  /etc/default/grub .
> These were not created by grub-install.
> Is there a default set somewhere?
> Would it be safe to copy them from my current install?

Those files are maintained and delivered by your distro; And used by
AFAIK those could be copied from an another install.

> Are there other directories and files I'll need?
> Thank you very much.
> I suspect you have rattled my thought patterns enough to resolve some
> apparently unrelated conundrums ;}

If i get it right, you would like to keep your boot partition portable.
In that case you may wish to create a simple separate conf for your
"full" install by hand like Goh already wrote.

However, for automating things it could work if you have os-prober set
up on your first partition.

An another option would be to make use of sh-like syntax of grub conf.
In that case you should take a look at how GRML does it.
(There is a conf on their iso which can be loaded by your locally
installed grub. If you prepare such a conf for your local install, your
could look up all partitions for such a conf and present menu entries on


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