5.3. Construction

5.3.1. Install utilities from e2fsprogs

Download the e2fsprogs source code package from http://sourceforge.net/projects/e2fsprogs/

bash# cd /usr/src/e2fsprogs-1.35 bash# export CC="gcc -mcpu=i386" bash# ./configure --host=i386-pc-linux-gnu bash# make bash# cd e2fsck bash# cp e2fsck.shared ~/staging/sbin/e2fsck bash# ln -s e2fsck ~/staging/sbin/fsck.ext2 bash# cd ../misc bash# cp fsck mke2fs ~/staging/sbin bash# ln -s mke2fs ~/staging/sbin/mkfs.ext2

5.3.2. Install utilities from util-linux

Get the latest util-linux source from ftp://ftp.win.tue.nl/pub/linux-local/utils/util-linux/

bash# cd /usr/src/util-linux-2.12h

Use a text editor to make the following changes to MCONFIG:

• Change "CPU=$(shell uname -m)" to "CPU=i386"

• Change "HAVE_SHADOW=yes" to "HAVE_SHADOW=no"

bash# ./configure bash# make bash# cp disk-utils/mkfs ~/staging/sbin bash# cp fdisk/fdisk ~/staging/sbin bash# cp login-utils/agetty ~/staging/sbin bash# ln -s agetty ~/staging/sbin/getty bash# cp login-utils/login ~/staging/bin bash# cp misc-utils/kill ~/staging/bin bash# cp mount/mount ~/staging/bin bash# cp mount/umount ~/staging/bin bash# cp mount/swapon ~/staging/sbin bash# cp sys-utils/dmesg ~/staging/bin

5.3.3. Check library requirements

bash# ldd ~/staging/bin/* | more bash# ldd ~/staging/sbin/* | more bash# ls ~/staging/lib

All of the dependencies revealed by the ldd command are for libraries already present in the staging area so there is no need to copy anything new.

5.3.4. Strip binaries to save space

bash# strip ~/staging/bin/* bash# strip ~/staging/sbin/*

5.3.5. Create additional device files

bash# mknod ~/staging/dev/ram0 b 1 0 bash# mknod ~/staging/dev/fd0 b 2 0 bash# mknod ~/staging/dev/null c 1 3

5.3.6. Create the fstab and mtab files

bash# cd ~/staging/etc

Use an editor like vi, emacs or pico to create the following file and save it as ~/staging/etc/fstab.

proc /proc proc defaults 0 0 /dev/ram0 / ext2 defaults 1 1

Create an empty mtab file.

bash# echo -n >mtab

5.3.7. Write a script to check and mount local filesystems

Use an editor to create the following shell script and save it as ~/staging/etc/init.d/local_fs:

#!/bin/sh # # local_fs - check and mount local filesystems # PATH=/sbin:/bin ; export PATH fsck -ATCp if [ $? -gt 1 ]; then echo "Filesystem errors still exist! Manual intervention required." /bin/sh else echo "Remounting / as read-write." mount -n -o remount,rw / echo -n >/etc/mtab mount -f -o remount,rw / echo "Mounting local filesystems." mount -a -t nonfs,nosmbfs fi # # end of local_fs

Set execute permissions on the script.

bash# chmod +x local_fs

5.3.8. Create a compressed root disk image

bash# cd / bash# dd if=/dev/zero of=/dev/ram7 bs=1k count=4096 bash# mke2fs -m0 /dev/ram7 4096 bash# mount /dev/ram7 /mnt bash# cp -dpR ~/staging/* /mnt bash# umount /dev/ram7 bash# dd if=/dev/ram7 of=~/phase4-image bs=1k count=4096 bash# gzip -9 ~/phase4-image

5.3.9. Write the root disk image to floppy

Insert the diskette labeled "root disk" into drive fd0.

bash# dd if=~/phase4-image.gz of=/dev/fd0 bs=1k