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Re: Dedicated grub2 partition

From: Goh Lip
Subject: Re: Dedicated grub2 partition
Date: Wed, 06 Oct 2010 21:02:25 +0800
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100922 Thunderbird/3.1.4

On Wednesday 06,October,2010 06:49 PM, Barry Jackson wrote:

Hmm.. see my point earlier about rescue systems on sticks - I avoid them.
If I boot from a CD then hd0 is sda1. If I boot from a stick, then the
stick is sda1 and hd0 can be sdc - it's chaos.
If I boot to my livecd in maingrub (sda1) everythig is just fine - all
drive assignments are correct.

Just on that point, can grub2 use labels instead of :-
set root=(hdx,y)/...
like :-
set root=myrootlabel...
or :-
set root=LABEL=myrootlabel

That would really be nice!

Yes, definitely! That's why I always use one of these....
search --no-floppy --fs-uuid --set xxxxxxxxxxxxxx
search --no-floppy --label --set xxx

I even remove
set root='(hd0,msdos7)' for example, even though its removal is not necessary. But if you leave it there, make sure this is *above* the "search xxxxxxxxx" line, eg

set root='(hd0,msdos7)'
search --no-floppy --fs-uuid --set xxxxxxxxxxxxxx

So, booting up any disk or usb partition by uuid or label is longer a 'chancey' affair.

Well I think this may be a no-go. I just read the log-on header to the
#grub IRC channel - to quote :-
"It is impossible to "boot" an ISO from disk unless that image
specifically supports that" which probably indicates that they are fed
up with people asking the question!
So maybe the ones that do work have been built with this in mind. I will
do some more reading.

I hope you are right on this. Hate to think that we cannot resolve this on our wits and persistence. :) But, yes, some livecd insist on their particular way to boot iso, and some include passkeys as well. Found casper pretty reliable and its use of 'persistence' and casper-rw is quite useful.

I only was testing it because of your suggestion. The other method of
extracting isolinux and livecd.sqfs works fine.

Out of interest :-
I have also re-mastered a live cd from a working PCLOS installation
(using mylivecd) after adding some extra tools, my user, and some custom
configuration, and that one boots fine the same way. I had to increase
the size of sda1 though for that to work as it was just too big for my
1GB partition.

Great, I remembered having trouble with this years back. But by installing to usb sticks (not live boots), seems to have made this moot (for me).

Thanks for all your help, but I think we failed :-(

Cheers, Barry

Had fun myself too, Barry; but I don't think we failed, to paraphrase Edison (I think), we succeeded in finding many ways that didn't work. :)

Regards and take care - Goh Lip

Life is a sexually transmitted disease with a 100% mortality rate.

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