#!/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
# 15-Apr-05 amo Make sure /proc exists
# 16-Apr-05 amo Update for Booting CF vs Booting USB
# 20-Aug-05 amo WRAP does not have battery for time ( fix date )
# 21-Aug-05 amo Merge to Support CF ( hda1 ) or USB ( sda1 )
# 01-Sep-05 amo 2005.0901 Use PreInstalled LoopFiles for RootFS
# 03-Sep-05 amo Use new bash.common.sh ( aka linuxrc.common.sh )
# 04-Sep-05 amo BootMsg is NOT yet available in initrd ( /linuxrc )
# 09-Sep-05 amo Use LoopFile instead of rootfs.tgz
# 15-Sep-05 amo Check for -x before executing rc.usb-stick
#
#
#
# Include the common functions and definitions
# --------------------------------------------
#	define docmd(), BootMsg() mount_proc()
#ource /LinuxRC/linuxrc.common.sh
source /etc/bash.common.sh
#
#
# To turn on debug messages
# -------------------------
DebugMsg="anything"
#
#
# --------------------------------------------------------
# Define the devices for CompactFlash vs USB-memory-stick
# --------------------------------------------------------
#
# # CF
#mount /dev/hda1
#
USBCFdev="/dev/hda"
USBCFmnt="/mnt/CF"
#
# # USB
#mount /dev/sda1
#
USBCFdev="/dev/sda"
USBCFmnt="/mnt/USB"
#
#
USBCFloop="/mnt/loop0"
#
# --------------------------
#
docmd "#"
docmd "# Executing /linurc"
docmd "# linuxrc: Boot=$DebugMsg..run=$runlevel.."
docmd "#"
#
# 
# leave a " " in front of mount, to avoid the debug output of an empty /proc/mounts
# -----------------------------
#
#
# Mount /proc
# ===========
#
mount -n -o rw,remount /
#
# make sure /proc exists
if [ ! -d /proc ]; then mkdir /proc ; fi
#
mount -t proc proc /proc
#
#
# Make / writable ( need "-n" for /etc/mtab )
# ---------------
docmd " mount -n -o rw,remount -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 /"
#
#
# Read/Write Tests
# -----------------
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
#
#
# Load the USB modules
# --------------------
#	#
#	# booting from GRUB requires the usb modules
#	#
#	# vfat is in the kernel, but it won't boot if vfat for /dev/sda1 is not installed here
#	#
# if [ -x "/etc/rc.d/rc.usb-stick" ];
# then
  #
  # required for "rootfs 1" even if the kernel has the usb and vfat/fat modules compiled in
  #
  docmd "/etc/rc.d/rc.usb-stick start "
  #
  #
  # for vfat partitions on /dev/sda1 ( aka /boot )
  # --------------------------------
  docmd "modprobe msdos "
  docmd "modprobe fat "
  docmd "modprobe vfat "
#
# fi
#
#
# ==
# == 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"
docmd " mount -o $CFRW ${USBCFdev}1 $USBCFmnt "
#
#
# 
ERREXIT="exit-on-critical-error"
#
# no point in continuing if the rootfs is not found
# docmd "ls -la $USBCFmnt/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"
#
#
# ------------------------------------------
# 01-Sep-05 amo use the PreInstalled RootFS
# ------------------------------------------
if [ ! -d /mnt/RootFS ];
then
  mkdir /mnt/RootFS
else
  umount /mnt/RootFS
fi
umount $USBCFloop
#
#
#	* jfs ( sda2 ) works on the 1st pass, but seems to be corrupted on subsequent mounts 
#	* trying xfs instead
#
# 09-Sep-05 amo Use LoopFile instead of rootfs.tgz
#
docmd " mount -t auto ${USBCFdev}2 $USBCFloop"
#
# no point in continuing if the rootfs ( its LoopFile ) is not found
docmd "ls -la $USBCFloop/LoopFile"
#
docmd " losetup /dev/loop0 $USBCFloop/LoopFile " 
#
docmd " mount /dev/loop0 /mnt/RootFS "
#
#
# not critical anymore
ERREXIT=""
#
#
# view the rootfs
# docmd "ls -la /mnt/RootFS"
#
# final sanity check  - remove debug messages, /linuxrc doesn't listen to BootMsg variable
# ------------------
# docmd "df | sort "
#
# docmd "cat /proc/mounts | sort "
#
#
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 "#"
#
#	# to free up memory
#	# umount /initrd/proc
#	# umount /initrd
#
# ---------------------------------------------------
# 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
#
#	exec /usr/sbin/chroot . /sbin/init <dev/console >dev/console
#
#
# Continue with normal bootup
# ============================
#	PID=1 should be init
# 
BootMsg "# "
docmd "ps axuw "
BootMsg "# "
#
# initid=` ps auwx | grep " init " | awk '{ print $2 }' `
#
#
BootMsg "# "
BootMsg "# Debug=$DebugMsg...run1=$runlevel..initid=$initid.."
#
if [ "$runlevel" = "" ]; then runlevel=3 ; fi
#
BootMsg "# Debug=$DebugMsg...run2=$runlevel..initid=$initid.."
BootMsg "#"
#
#
# ======================================================================
# lilo and grub does NOT need to chroot to boot properly with /dev/loop
# ======================================================================
#
# Upon exiting /linuxrc, normal /sbin/init is supposed to be executed
#
# if [ "$1" = "" -o "$InitLevel" = "3" -o "$InitLevel" = "1" ];
#
# if [ "$initid" = "1" ];
# then
#   #
#   InitCMD="exec chroot $MntRootFS /sbin/init $runlevel"
#   #
# else
#   #
#   InitCMD="exec chroot $MntRootFS /etc/rc.d/rc.S && /etc/rc.d/rc.M "
#   #
# fi
#
#
# Work aroound the problem that syslinux cannot find /dev/loop
#
# if [ "$SysLinux" = "WorkAround" ];
# then
#     InitCMD="exec chroot $MntRootFS /etc/rc.d/rc.SM "
# fi
#
BootMsg "#"
docmd "df"
BootMsg "#"
BootMsg "WorkAroundInitCmd=$InitCMD"
BootMsg "#"
#
sleep 5
#
$InitCMD
#
# Creating RootFS worked
#
exit 0
#
#
# End of file