On Thu, Sep 30, 2010 at 1:22 PM, Bruce Dubbs <bruce.du...@gmail.com> wrote: > Mark Knecht wrote: >> Hi, >> I've recently found LFS. Thanks to those that feed and care for it. >> Nice project. >> >> I've read through the book once and started my first build. It's >> proceeding fine. I'm typically a Gentoo user so most of what's going >> on in terms of building software is relatively familiar and I'm not >> having any trouble. (Yet!) >> >> That said my reason for searching out and trying LFS is to learn >> more about init scripts. It seems that the LFS init scripts - if I >> understand them and likely I don't - sort of leave the init scripts >> alone and as a result they remain sort of generic. They handle lots of >> different file system types and many conditions I don't think will be >> important to me. >> >> My personal goal is to understand, for a _very_ minimal system with >> just a couple of partitions and most all of the drivers built into the >> kernel, how to boot the kernel and then load everything by hand, one >> command at a time. I.e. = I'd like to mount /proc, mount /dev, mount >> /sys all by hand and then work through understanding what the scripts >> do step by step. I don't care about X for now. I do need networking. >> >> I'm wondering if there might be a good doc around, either LFS >> specific or even a for-sale Linux book I could buy, that covers what >> has to happen to get from that last stage of the kernel booting to a >> bash prompt that allows a user to login? > > The first program to run in linux is init. We use sysvinit. That reads > /etc/inittab. > > From there thee are really three lines that are significant: > > id:3:initdefault: > si::sysinit:/etc/rc.d/init.d/rc sysinit > l3:3:wait:/etc/rc.d/init.d/rc 3 > > The second and third line run the /etc/rc.d/init.d/rc scripts. The > third line is run because of the first. > > Read the rc script to trace what is happening. The scripts are written > for LFS, but the functionality is close to RedHat's scripts. Generally > the scripts have been pretty stable. We have not made significant > changes in years. > > -- Bruce
Thanks Bruce. I'm sure that will help me move forward. Am I fooling myself in thinking that for a very simple hardware system, maybe just an EXT2 boot, EXT3 / and a swap partition, that for this specific machine the init scripts might be reduced to something like 10-20 bash commands which get me to the bash command line where as root I could use the system? As a user type I've used Linux for 15 years, Gentoo for 10-11, Redhat before that, but I've never paid attention to what goes on after the kernel starts the init process. I'm thinking maybe it's time to learn a little more. Thanks, Mark -- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
