#!/bin/bash
#
# /linuxrc.usb.usb:  init script to load initrd kernel modules
#
#
# For More Ramdisk Options ...
# ----------------------------
#	linuxrc.Commands.Help.txt
#
#
#
# 02-Nov-04 amo Create a minimal initrd.gz to load the rootfs.gz as /
# 13-Nov-04 amo Split off ramdisk options into linuxrc.Commands.Help.txt
# 20-Nov-04 amo Split off common mount and checking to linuxrc.common.sh
# 23-Nov-04 amo Use CFRW to debug mount CF as rw vs ro options -> linuxrc -> /etc/fstab
# 26-Mar-05 amo Modified for CF ( hda1 ) or USB ( sda1 )
# 27-Mar-05 amo "root=/dev/ram0 1" has no single user, root=/dev/loop0 is readonly
# 29-Mar-05 amo use /dev/sda2 ( usb or cf ) to uncompress rootfs.gz into and chroot into it
# 02-Apr-05 amo Explicity set PATH and remount /
# 03-Apr-05 amo Fixed localtime w/ hwclock
#
#
#
# Include the common functions and definitions
# --------------------------------------------
#	define docmd(), mount_proc()
source /LinuxRC/linuxrc.common.sh
#
set | grep ^PATH
#
#
export PATH=/sbin:/usr/sbin:/bin:/usr/bin
#
#
InitLevel=3
#
if [ "$1" = "1" ];
then
   InitLevel=1
fi
#
#
# Flush and reset first
#
# CF
#mount /dev/hda1
#
# USB
#mount /dev/sda1
#
#mount /dev/ram0
#mount /proc
#
#
docmd "#"
docmd "# Executing /linurc"
docmd "#"
#
# 
# leave a " " in front of mount, to avoid the premature output of an empty /proc/mounts
# -----------------------------
#
#
# Check /proc
# ===========
#
# mount_proc
#
# echo "mount.proc.sh"
#
mount -n -o rw,remount /
#
mount -t proc proc /proc
#
#
# Make / writable ( need "-n" for /etc/mtab )
# ---------------
docmd " mount -n -o rw -t ext2 /dev/ram0 /"
#
#
# Remount it again so that it shows up in the now writable /etc/mtab
# ----------------
docmd " mount -o rw,remount -t ext2 /dev/ram0 /"
#
# docmd "ls -la /"
#
#
docmd " touch /Read-Write-Test.txt "
#
if [ ! -f "/Read-Write-Test.txt" ];
then
  #
  docmd "# FATAL ERROR /dev/ram0 is NOT read write.."
  #
  exit 1
  #
else 
  #
  rm -f "/Read-Write-Test.txt"
  #
fi
#
docmd " ls -la /mnt "
#
#
# Load the kernel modules if any
#
# for module in /lib/modules/`uname -r`/*.*o ; do
#   insmod $module
# done
#
docmd " /etc/rc.d/rc.usb-stick start "
#
# ==
# == i donno why /dev/hda1 needs to be rw here
# ==
#
# Mount the compact flash ( CF:/boot/rootfs.gz )
# -----------------------------------------------
#	==
#	== pivot_root/chroot works if both /mnt/CF and *.img are "ro"
#	==
#	-----------------------------------------------
#	- with "ro", system boots into RootFS with "ro" but is in fact ro 
#	-----------------------------------------------
#
CFRW="ro"
#ocmd " mount -o $CFRW /dev/hda1 /mnt/CF"
docmd " mount -o $CFRW /dev/sda1 /mnt/USB"
#
#
# 
ERREXIT="exit-on-critical-error"
#
# no point in continuing if the rootfs is not found
docmd "ls -la /mnt/USB/boot/rootfs.tgz"
#
#
#
# rootfs is 32MB 
# --------------
#	-
#	- we need initrd to create the 32MB rootfs 
#	- pivot_root expects a directory name
#	- when we pivot_root and chroot into /mnt/loop0, we want to rw into /dev/tty, /var/*
#	-
#
# # This make the rootfs "ro"
# cmd " mount -o $CFRW,loop /mnt/USB/boot/rootfs.img /mnt/loop0"
#
#
# #
# # Create some working area
# # -------------------------
umount /mnt/RootFS
umount /mnt/sda2
docmd "mkfs.jfs -q /dev/sda2 "
docmd "mount /dev/sda2 /mnt/sda2"
#
#
#
# #
# # Uncompress the rootFS /dev/loop to run in memory
# # ------------------------------------------------
# # /root/losetup.sh.txt
#
docmd "dd if=/dev/zero of=/mnt/sda2/LoopFile bs=1024k count=32"
#
#ocmd "losetup /dev/loop0 /mnt/LoopFile"
#
docmd "mkfs.jfs -q /mnt/sda2/LoopFile"
#
mkdir /mnt/RootFS
docmd "mount -o loop,rw /mnt/sda2/LoopFile /mnt/RootFS"
#
#
docmd "#"
docmd "# Setting system time from the hardware clock (localtime)."
docmd "#"
docmd "/sbin/hwclock --localtime --hctosys"
docmd "date"
docmd "#"
#
#
docmd "cd /mnt/RootFS && tar zxfp /mnt/USB/boot/rootfs.tgz "
#
sync
#
#
# losetup -d /dev/loop0
#
#
umount /mnt/sda2/LoopFile
umount /mnt/sda2
umount /mnt/sda1
#
#
# not criticl anymore
ERREXIT=""
#
#
# view the rootfs
# docmd "ls -la /mnt/RootFS"
#
# final sanity check
docmd "df"
#
docmd "cat /proc/mounts"
#
#
sync
#
#
# ---------------------
# /dev/ram is loaded -- linuxrc should pass control to /sbin/init by default
# ---------------------
#
#
# docmd "#"
# docmd "# Done: /linuxrc ..."
# #ocmd "#    start /linux.loop in lieu of /sbin/init since"
# #ocmd "#    /bin, /dev, /etc, /sbin is a preformatted loop device "
# docmd "#"
#
#
# Tell the kernel, / is already mounted
# --------------------------------------
#	/dev/loop0	7,0
#	/dev/loop1	7,1
#
docmd "# /dev/loop0 == 0x700 == 1792"
docmd "# /dev/loop1 == 0x701 == 1793"
docmd "echo '0x700' > /proc/sys/kernel/real-root-dev"
docmd "#"
#
#
#
# Attempt to Get rid of "pivot_root: Device or Resource is busy"
# ---------------------------------
#	- "busy error" seems to be non-fatal when "mount  ro"
#	- "busy error" exits if "mount rw"
#
#	#
#	# pivot_root does not seem to be needed
#	#
# docmd "cd /mnt/RootFS"
# docmd "umount /proc"
# docmd "pivot_root . /initrd"
# docmd "#"
#
#
# ---------------------------------------------------
# use a variable to make sure chroot is done properly
# ---------------------------------------------------
MntRootFS="/mnt/RootFS"
#
docmd "cd $MntRootFS"
#
#
#
# Invoking chroot from inside linuxrc causes:
# ------------------------------------------
#	"error opening/writing control channel /dev/initctl"
#
#	- use pivot-root to avoid the above error
#
# Continue with normal bootup
# ============================
#
echo  "# "
echo  "exec chroot $MntRootFS /sbin/init $InitLevel"
echo  "#"
#
#
# Upon exiting /linuxrc, normal /sbin/init is supposed to be executed
#
if [ "$1" = "" -o "$InitLevel" = "3" -o "$InitLevel" = "1" ];
then
  #
  exec chroot $MntRootFS /sbin/init $InitLevel
  #
  # </dev/console 2>&1
  # </dev/console >/dev/console 2>&1
  #
else
  #
  # Interactive debugging, turn on the mouse
  #
  docmd "/etc/rc.d/rc.gpm start"
  docmd "#"
  #
fi
#
# Creating RootFS worked
#
exit 0
#
#
# End of file