udev support

[nestu]

Hi again,
New release. Thinking about backwards compatibility, it 
supports defaults. If no dev=[udev|devfs|static] on cmdline, 
it works with these defaults:

kernel 2.4.X :
	if you tried to boot udev, you are a blueyes: Warning msg. 
Falls through to the next 2 options.	
	if you have devfsd, it will try to boot it. If not, you'll 
get a msg and it will fall through.
	if you don't have devfs, it supposes you have a static 
/dev. Will try to boot from there.

kernels 2.6.X :
	if you have udev installed, it will try to boot from it. If 
not, it will fall through.
	If you have devfs installed, it will try to boot from it. 
If not, it will fall through.
	if you have none of the above, it will think you have a 
static /dev.

This default behaviour can be overrided from cmdline very 
easily:
lilo: add append="dev=$YOURCHOICE"
grub: on 'kernel' line, after the kernel's image placement 
add "dev=$YOURCHOICE".

I could swap devfs and udev for 2.6 kernel, since devfs is 
currently mostly used, and later, swap them back when udev 
is more broadly used. But, I must say, I am against this. I 
prefer the 2.6 lusers getting used that they'll use udev in 
the future. IAC, if they don't want udev, just don't install 
it, and it will boot from devfs anyway.

This script has been tested on 2.6's kernels (udev on 'me 
ol'daddy's boxen', and devfs on a 2.6 devfs install inside 
qemu from 2.6 iso), and on a 2.4 devfs (Terry's 1.4.0 iso) 
qemu install. All booted fine, AFAICS. You can always say I 
am wrong! (I'm sorta expecting it, really...) I must admit 
that at least the msgs and the tabbing needs some polishing, 
but I think this is a good step forward.

Okay, so ppl aren't very happy playing with their boots. Do 
like me and just test it in qemu, for example ;) Hell, if 
you test you own box, just backup your current 
/etc/init.d/mount, change for my script, and if you have 
anyproblems, just boot the iso and put the old one back (I 
did it quite a few times debugging on my dad's box! ;) Harmless.

Thanks,
Jaime ;)))

P.S. You are better off reading the whole lot, since it is 
quite changed, tabbing of the script included. 	
-- 
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<Veerappan> another foot, and my bike would fit :)

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