#!/bin/bash -x
#
# Creating a custom InitRD.gz 
# ----------------------------
#
# Original Script
# ----------------
#	http://Linux-Boot.net/Boot.Standalone/FD/Floppy.Howto.sh.txt
#	http://Linux-Boot.net/Boot.Standalone/FD/Floppy.InitRD.sh.txt
# 
#
# 21-Jan-05 amo Date-of-Birth
# 16-Mar-05 amo Split apart Standalone-BootFloppy-Howto into sections
# 25-Mar-05 amo ReOrg for Bootable FD, CF, CD, USB
#
#
#
# Sanity Checking -- get the build environment
# ============================================
# 
if [ ! -f Floppy.variables.sh.txt ];
then
  echo "#"
  echo "# ERROR: cannot find all the scripts "
  echo "#"
  #
  exit 1
  #
fi
#
source Floppy.variables.sh.txt
#
#
#
# ========================================
# Directory Tree for the initrd
# ========================================
#
INITRD="/tmp/initrd.fd"
#
# remove old stuff first
# ----------------------
doecho "#"
doecho "rm -rf $INITRD"
#
doecho "#"
doecho "mkdir $INITRD"
doecho "#"
#
#
KERNEL=`uname -r`
#
#
# a little clearer for initrd's temporary directories tree
#
doecho "mkdir    $INITRD/bin"
doecho "mkdir    $INITRD/etc"
doecho "mkdir -p $INITRD/lib/modules"
doecho "mkdir    $INITRD/dev"
doecho "mkdir -p $INITRD/mnt/loopfs"
doecho "#"
#
# cd initrd ; ln -s ./bin sbin ; cd ..
#
#
# sash is standalone shell
# bash is bigger and needs additional libraries
# tcsh is smaller
# 
# # if you need modules
# cp -dpar /bin/*mod*	initrd/bin
#
#
doecho "cp -dapr /bin/tcsh /bin/df /bin/mount	$INITRD/bin"
doecho "#"
doecho "cp -dpar /dev/console /dev/null	$INITRD/dev"
doecho "cp -dpar /dev/ram /dev/ram?	$INITRD/dev"
doecho "cp -dpar /dev/fd0 /dev/loop?	$INITRD/dev"
doecho "#"
doecho "cp -dpar /dev/systty	 	$INITRD/dev"
doecho "cp -dpar /dev/tty?		$INITRD/dev"
doecho "#"
#
# /lib/libsafe*
doecho "cp -dpar /lib/libtermcap* /lib/libdl* /lib/libc* /lib/ld-linux* $INITRD/lib"
doecho "#"
#
#
# Minimal fstab and inittab
# -------------------------
doecho "cp $OrigPWD/Patches.FD/etc/fstab	$INITRD/etc"
doecho "cp $OrigPWD/Patches.FD/etc/inittab	$INITRD/etc"
#
#
# Fill the initrd with the desired modules
# ========================================
#	#
#	# the required modules you specify are loaded by initrd/linuxrc	
#	#
# cp -dpar /lib/modules/$KERNEL/scsi/aic7xxx.o	initrd/lib
#
# # the entire modules tree for the kernel
# cp -dpar /lib/modules/$KERNEL			initrd/lib/modules
#
#
# =====================
# Create the /linurc
# =====================
doecho "cp $OrigPWD/Patches.FD/linuxrc			$INITRD/linuxrc"
#
# minimal list of libraries
doecho "cp $OrigPWD/Patches.FD/etc/ld.so.conf		$INITRD/etc"
# 
doecho "ldconfig -f $INITRD/etc/ld.so.conf   -C  $INITRD/etc/ld.so.cache"
doecho "#"
# 
# 
#
# Test the /linuxrc file
# ----------------------
#	chroot /tmp/initrd /bin/tcsh
#	/linuxrc
#
#	# to return from chroot
# 	exit
#
#
# The loop-based InitRD 
# ---------------------
LOOP="/tmp/initloop"
#
#
# Clean up (remove) previous versions
# ------------------------------------
#
if [ ! -d "/mnt/loop" ];
then
  doecho "mkdir /mnt/loop"
else
  #
  echo "losetup -d /dev/loop0"
  losetup -d /dev/loop0
  #
  doecho "#"
  umount /mnt/loop
  #
fi
#
#
# ==============================
# Create the initrd-custom.gz
# ==============================
#
# Now Create the ramdisk ( size is limited by the kernel )
#
# or  Create the loopdisk ( any arbitrary size )
#
doecho "dd if=/dev/zero of=$LOOP count=2500 bs=1024"
doecho "losetup /dev/loop0 $LOOP"
doecho "mke2fs -q /dev/loop0"
doecho "mount /dev/loop0 /mnt/loop"
#
doecho "#"
doecho "cp -dpar $INITRD/* /mnt/loop"
doecho "sync"
#
doecho "#"
doecho "df"
doecho "exit 1"
doecho "#"
doecho "ls -la /mnt/loop"
doecho "umount /mnt/loop"
doecho "losetup -d /dev/loop0"
doecho "#"
#
#
doecho "gzip -c $LOOP > $INITRD-$VER.gz"
doecho "#"
#
doecho "#"
doecho "# To view the unerased initrd"
doecho "# ---------------------------"
doecho "#    ls -laR $INITRD "
doecho "#"
#
doecho "#"
doecho "# Next .. Create the Floppy"
doecho "# -------------------------"
doecho "#    sh Floppy.MBR.sh.txt"
doecho "#"
#
#
# End of file