#!/bin/bash
#
# /linuxrc:  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
#
#
#
# Define  the path
#
export PATH="/sbin:/bin:/usr/sbin:/usr/bin"
#
#
# Exit if the Commands fails
# ==========================
#
function docmd
{
  cmd="$1"
  #
  ERR=""
  #
  # check for the mount commands
  mnt=`echo "$cmd" | grep ^mount | cut -d ' ' -f 1`
  #
  # check for comments
  com=`echo "$cmd" | grep ^#     | cut -d ' ' -f 1`
  #
  #
  if [ "$com" = "#" ];
  then
    #
    # not a command
    echo "$cmd"
    #
  else
    echo ""
    echo "$cmd"
    $cmd
    #
    stat=$?
    if [ $stat != 0 ];
    then
      echo ""
      echo "ERROR: Failed: ${stat}: $cmd "
      #
      # mount and df fails depending on /proc being mounted or not
      #		32 == it wants " mount -t type "
      if [ "$mnt" = "mount" -a $stat != 32 ];
      then
        echo " already mounted"
        echo ""
      else 
        echo "#"
        echo "# Aborting: /linuxrc"
        echo "#"
        #
        ERR="1"
      fi
    fi
    #
    # show what's mounted after the mount command
    #
    if [ "$mnt" = "mount" ];
    then
      docmd "cat /proc/mounts"
#     ls -la /etc/mtab
      docmd "cat /etc/mtab"
#     docmd "mount"	# show whats mounted
      docmd "df"
    fi
    #
    if [ ! -z "$ERR" ];
    then
      exit 1
    fi
  fi
  #
} # docmd
#
#
# Flush and reset first
#
umount /dev/hda1
umount /dev/ram0
umount /proc
#
#
docmd "#"
docmd "# Executing /linurc"
docmd "#"
#
# 
# leave a " " in front of mount, to avoid the premature output of an empty /proc/mounts
# -----------------------------
#
#
# Check /proc
# ===========
#
if [ ! -f "/proc/mounts" ];
then
  #
  # Mount /proc filesystem
  # ----------------------
  #ocmd " mount -n -t proc proc /proc"
  #
  # knoppix uses none and /dev/pts
  docmd " mount -n -t proc  none /proc"
  #ocmd " mount -n -t devfs none /dev/pts"
  # mount -t devpts /dev/pts /dev/pts
  #
  # linux-2.6
  # mount -t sysfs /sys /sys >>$log 2>&1
  #
  #
else
  #
  echo "#"
  echo "# /proc already mounted "
  echo "#"
  #
fi
#
#
# Make / writable ( need "-n" for /etc/mtab )
# ---------------
docmd " mount -n -o rw,remount /dev/ram0 /"
#
# Remount it again so that it shows up in the now writable /etc/mtab
# ----------------
docmd "mount -o rw,remount /dev/ram0 /"
#
# docmd "ls -la /"
#
#
#
#
# Load the kernel modules if any
#
# for module in /lib/modules/`uname -r`/*.*o ; do
#   insmod $module
# done
#
#
# ==
# == i donno why /dev/hda1 needs to be rw here
# ==
#
# Mount the compact flash ( CF:/boot/rootfs.gz )
# -----------------------------------------------
docmd "mount -o rw /dev/hda1 /mnt/CF"
#
# no point in continuing if the rootfs is not found
docmd "ls -la /mnt/CF/rootfs.img"
#
#
# rootfs is 24MB 
# --------------
#	-
#	- we need initrd to create the 24MB rootfs 
#	-
docmd "mount -o ro,loop /mnt/CF/rootfs.img /mnt/loop0"
#
# # view the rootfs
# docmd "ls -la /mnt/loop0"
#
# # extra
# docmd "df"
#
#
# "man initrd" says to unmount everything before existing linuxrc
#  but we're still using/needing /mnt/hda/rootfs
# 
# 
# unmount the compact flash
# docmd "umount /mnt/CF"
#
#
# leave /proc, since echo fails 
# docmd "umount /proc"
#
sync
#
#
# ---------------------
# /dev/ram is loaded -- linuxrc should pass control to /sbin/init by default
# ---------------------
#
#
docmd "#"
docmd "# Done: /linuxrc ..."
docmd "#    start /linux.loop in lieu of /sbin/init since"
docmd "#    /bin, /dev, /etc, /sbin is a preformatted loop device "
docmd "#"
#
#
#ocmd "chroot /mnt/loop0 /linuxrc.loop"
#
#	0100	/dev/ram0	
#	0700	/dev/loop0
#	0301	/dev/ram1
#
# echo "0x700" > /proc/sys/kernel/real_root_dev
#
#
# causes:
#	pivot_root:  device or resource busy
# docmd "pivot_root /mnt/loop0 /initrd "
# docmd "chroot /mnt/loop0 /sbin/init 3"
#
echo "cd /mnt/loop0 && pivot_root . /initrd "
      cd /mnt/loop0 && pivot_root . /initrd
#
#
# dumps you into /mnt/loop0 and does not execute /sbin/init
# docmd "exec chroot . "
#
#
#
# -
# - pivot_root is needed for chroot + init to work
# -
#
# http://www.sdc.org/~leila/usb-dongle/usb-filesystem/linuxrc
#
#ocmd "cd /mnt/loop0 "
#ocmd "/sbin/pivot_root . /initrd "
#ocmd "exec /usr/bin/chroot . /sbin/init 3 "
#ocmd "exec chroot . /sbin/init < dev/console 2>&1 "
#
#
#
# To manually see what's going on rootFS
# --------------------------------------
#
# docmd "chroot /mnt/loop0 /bin/bash"
# docmd "chroot /mnt/loop0 /linuxrc.loop"
#
#
#	a shell ( including /linuxrc ) CANNOT call init --> causes error message:
#	"error opening/writing control channel /dev/initctl"
#
#	# chroot /mnt/loop0 /sbin/init 1
#
#
# From man initrd
# ---------------
#	Upon exiting /linuxrc, normal /sbin/init will be invoked
#	and /dev/ram0 will have been previously moved to /initrd
#
#	except in this case, / cannot be mounted since /dev/loop0
#	does not yet exist in the real rootFS, so we will use
#	linuxrc.loop instead
#
#
# End of file