#!/bin/sh

# Builds (most of) a directory that can be used as
# a stand-alone root filesystem.  See make_image
# for the next step.

# This script is highly customized to my purposes,
# Use it as a guide.  It can (and should) be run as
# a non-privileged (development) user.

# Larry Doolittle   <LRDoolittle@lbl.gov>  September 2000

BASE=$PWD
APP=$HOME/mebt/fpga
mkdir -p root
cd root
rm -rf *      # start with a clean slate
HERE=$PWD

mkdir bin sbin lib usr dev var tmp proc mnt
mkdir usr/bin usr/lib mnt/floppy
mkdir -p home/mortal/.ssh
# The /etc directory gets created with a cp -a (below).

# Miscellaneous system binaries, not covered by busybox.
cp /sbin/ifconfig         sbin/
cp /sbin/route            sbin/
cp /usr/bin/strace        bin/
cp /usr/local/bin/socket  bin/

# Application-specific binaries
cp $APP/cs/fserver  usr/bin/
cp $APP/xsload      usr/bin/

# Stripping normally saves a huge amount of space.
strip sbin/* usr/bin/*
# Am I really working around a bug in GNU strip 2.9.1?
for f in bin/*; do strip $f; done

# BusyBox (http://busybox.lineo.com/) is cool, you
# should use it if space is an issue.  I recommend
# configuring it to include at _least_ init, ls, more, 
# df, echo, grep, head, tail, insmod, rmmod, ln,
# kill, mkdir, mknod, mount, ps, rm.
# The busybox install script fills up directories with symlinks,
# so install it _after_ the generic strip command above.
# The busybox makefile strips for us.
# BUSYBOX_DIR=$HOME/net/byld-1.0beta3/packages/BYLD/BusyBox/busybox-0.46
BUSYBOX_DIR=$HOME/rffe/busybox-fpga
( cd $BUSYBOX_DIR || exit; make PREFIX=$HERE install)

# System configuration files.  I don't supply these.
# I hope this list is a good reminder of what you need
# to bring networking up nicely, but you really have to
# understand what they are and create versions for yourself.
# /etc/init.d/rcS is the default system initialization script
# for busybox's init.
#
# $ ls -R etc
# group          hosts          inittab        pam.conf       resolv.conf
# host.conf      init.d         nsswitch.conf  passwd         ssh
# 
# etc/init.d:
# rcS
# 
# etc/ssh:
# ssh_host_key      ssh_host_key.pub  sshd_config

cp -a $BASE/etc etc

#  This is a weird one
cp $HOME/.ssh/csg.identity.pub home/mortal/.ssh/authorized_keys

#  Libraries.  Kind of a pain.  BYLD seems to use its
#  scripts to identify needed libraries, but I'll
#  bet it wouldn't find libnss_*, that glibc2 pulls
#  in as needed based on /etc/nsswitch.conf .
#
#  Maybe I should do this too, proceeding something like:
# EXES=`find . -perm +111 -type f`
# EXES=`file $EXES | grep "dynamically linked" | awk -F: '{print $1}'`
# NSSVER=2.0.7
# NSSLIBS=$(awk '/[a-z]/&&!/#/{for(i=2;i<=NF;i++)f[$i]=1}\
#                END{for(i in f)print "/usr/lib/libnss_"i"-'$NSSVER'.so"}\
#               ' etc/nsswitch.conf)
# LIBS=`ldd $EXES $NSSLIBS | awk '(NF==4 && $2=="=>"){f[$3]=1}\
#                                 END{for(i in f)print i}'`
# cp $LIBS $NSSLIBS lib/

cp /lib/ld-2.0.7.so             lib/
cp /lib/libc-2.0.7.so           lib/
cp /lib/libm-2.0.7.so           lib/
cp /lib/libnsl-2.0.7.so         lib/
cp /lib/libnss_dns-2.0.7.so     lib/
cp /lib/libnss_files-2.0.7.so   lib/
cp /lib/libnss_compat-2.0.7.so  lib/
cp /lib/libresolv-2.0.7.so      lib/
cp /usr/lib/libstdc++.so.2.8.0  lib/

# Stripping libraries tends to save even more space than for the executables.
strip lib/*

# Kernel modules
MODULE_DIR=$HOME/rffe/linux-2.0.36/modules
mkdir lib/modules
cp $MODULE_DIR/8390.o lib/modules
cp $MODULE_DIR/ne.o lib/modules

echo "Root filesystem finished."
echo "Space taken:"
du
echo "Suggested next step: make_image (have to be root for that one)"