Re: aborting at stage 1?

[Mike Buland <mike@geekgene.com>]

On Saturday 28 April 2007 01:34:23 pm Jorge Almeida wrote:
> On Sat, 28 Apr 2007, Vincent Danen wrote:
> > * Jorge Almeida <jalmeida@math.ist.utl.pt> [2007-04-28 13:20:21 +0100]:
> >> What happens if some vital init task fails? Suppose that checking the
> >> root filesystem fails. The system should halt, but how to do it? If the
> >> script ends with "init 0" in case the previous steps fail, then some
> >> changes must be made in /etc/runit, according to the man page of
> >> runit-init. But if the root file system is mounted read-only...
> >
> > This has pretty much nothing to do with runit.  For instance, my
> > /etc/runit/1 is:
>
> Thank you for your reply, but I'm kind of lost here. The system I'm
> trying to setup is LFS. I don't want to use general boot scripts, I'm
> trying to keep the boot scripts (i.e., stages 1 and 3 scripts) simple
> and customized to my system (sacrifying generality). I noticed that the
> rc script in the link you provided uses /sbin/halt. In my Gentoo system,
> /sbin/halt belongs to the sysvinit package, so I suppose it will not be
> available in a sysvinit-free, pure runit, system. Is this correct? If
> so, the point is how to halt the system during stage 1 when something
> goes wrong and the root filesystem is not writable. From what I
> understood of the runit man pages, the only way to halt the computer
> when something goes wrong during stage 1 is to have the script
> /etc/runit/1 to issue "init 0". This will jump over stage 2 but will go
> to stage 3, which will need the root filesystem to be writable.
>
> Thanks.
>
> Jorge Almeida

I've been an LFS guy for quite a while now, and if you want any extra help 
with system setup feel free to send me an e-mail.  As far as halt goes, it is 
part of the sysvinit package, but so are a lot of other pretty important base 
components, checking my paco log it has mountpoint, pidof, halt, killall5, 
poweroff, reboot, shutdown, sulogin, telinit, last, lastb, mesg, utmpdump, 
and wall.  You can always install it and then get rid of the couple programs 
you're not going to use, but init only takes up 32k stripped on my system.

On my machine I setup runit to use the sysv style rc sysinit to begin with, 
it's really very easy, and you can always clean up the scripts that you don't 
need once you get it all working.

Like I say, if you want more info about cleaning this up or working with LFS, 
let me know.

--Mike