#! /bin/sh

##############################################################################
#
# Yoshinori OKUJI <yo@nexedi.com>
# Alexandre Boeglin <alex@nexedi.com>
#
# Copyright (C) 2003,2004 Nexedi SARL
#
# This program is Free Software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. ?See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA ?02111-1307, USA.
#
##############################################################################

MODULES="%(modules)s"
BOOT_PARTITION="%(boot_partition)s"
BOOT_DEVICE="%(boot_device)s"
COMPRESSION="%(compression)s"

for module in $MODULES; do
  echo Inserting /lib/$module.ko...
  insmod /lib/$module.ko
done

# wait until the compact flash device becomes ready.
while true; do
  sfdisk -R $BOOT_DEVICE >/dev/null 2>&1 && break
  echo Re-reading $BOOT_DEVICE failed. Retrying...
  sleep 1
done

# mount all the points that are in /etc/fstab
mount -a

if test "x$COMPRESSION" = xyes; then
  mount -n -t tmpfs none /sysroot/

  # create necessary directories
  cd /sysroot
  mkdir boot dev initrd mnt opt proc tmp
  chmod 1777 tmp
  mkdir mnt/cf mnt/squashfs

  # mount the compact fash on /sysroot/mnt/cf which allow to use the squashfs
  mount -t vfat $BOOT_PARTITION /sysroot/mnt/cf

  # if the default boot partition is wrong (may happen when multiple usb
  # keys are plugged in at boot time), try every scsi device and look for
  # a base.sqh file
  #if test ! -f /sysroot/mnt/cf/base.sqh; then
  #	echo Root image not present on $BOOT_PARTITION
  #	umount /sysroot/mnt/cf
  #	for scsi_device in /dev/scsi/host*/bus*/target*/lun*; do
  #		echo Available device : $scsi_device
  #	done
  #	for scsi_device in /dev/scsi/host*/bus*/target*/lun*; do
  #		scsi_disc=$scsi_device/disc
  #		scsi_part=$scsi_device/part1
  #
  #		while true; do
  #		  sfdisk -R $scsi_disc >/dev/null 2>&1 && break
  #		  echo Re-reading $scsi_disc failed. Retrying...
  #		  sleep 1
  #		done
  #
  #		if test ! -e $scsi_part; then
  #			echo No first partition on $scsi_disc
  #			continue
  #		fi
  #
  #		mount -t vfat $scsi_part /sysroot/mnt/cf
  #		if test ! -f /sysroot/mnt/cf/base.sqh; then
  #			echo Root image not found on $scsi_part
  #			umount /sysroot/mnt/cf
  #		else
  #			echo Root image found on $scsi_part
  #			break
  #		fi
  #	done
  #fi

  # detect if a remote upgrade has been done.
  if test -f /sysroot/mnt/cf/base.new; then
    mv -f /sysroot/mnt/cf/base.new /sysroot/mnt/cf/base.sqh
  fi

  # mount the squashfs
  mount -o ro,loop -t squashfs /sysroot/mnt/cf/base.sqh /sysroot/mnt/squashfs

  # copy /etc, /root, /var on the ramdisk (so in read/write)
  cp -a /sysroot/mnt/squashfs/etc /sysroot/
  cp -a /sysroot/mnt/squashfs/var /sysroot/
  cp -a /sysroot/mnt/squashfs/root /sysroot/
  cp -a /sysroot/mnt/squashfs/home /sysroot/
  # create /fastboot so as not to verify the filesystem at boot time
  cp /dev/null /sysroot/fastboot

  # copy config files on the ramdisk, if config.tgz is present.
  if test -f /sysroot/mnt/cf/config.tgz; then
    tar -xzvpf /sysroot/mnt/cf/config.tgz -C /sysroot/
  fi

  # Remove garbage, if any. These can be, when the machine crashes while
  # running rsync.
  for i in /sysroot/mnt/cf/.*; do
    if test $i != /sysroot/mnt/cf/. -a $i != /sysroot/mnt/cf/..; then
      rm -f $i
    fi
  done

  #echo /dev/*

  # link the other directories from squashfs
  ln -s /mnt/squashfs/bin /sysroot
  ln -s /mnt/squashfs/sbin /sysroot
  ln -s /mnt/squashfs/lib /sysroot
  ln -s /mnt/squashfs/usr /sysroot

  # Really necessary?
  mount -t tmpfs none /sysroot/mnt/squashfs/lib/dev-state
else
  mount -o defaults --ro $BOOT_PARTITION /sysroot
fi

# do a "pivot_root" so as to change the place of /
pivot_root /sysroot /sysroot/initrd

# mount devfs and /proc
mount -t devfs none /dev
mount -t proc none /proc

# allow to justify that / is really /
echo 0x100 > /proc/sys/kernel/real-root-dev
# umount some filesystems
umount /proc
umount /initrd/proc