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#!/bin/sh
#
# script to spawn a chroot inside ubuntu mobile squashfs files for
# modifications and package installations. Make sure to have enough free
# space in the vfat image, if you need more than available, use the
# grow_image.sh script from this script collection
#
# Requires: squashfs-tools
#
# Copyright 2008 Canonical LTD.
# Authors: Oliver Grawert <ogra@ubuntu.com>
# Emmet Hickory <persia@ubuntu.com>
#
# Lincensed under terms and conditions of the GPL v2
if [ -z $1 ];then
echo 'i need a path to an imagefile as first argument'
exit 0
fi
mkdir /tmp/image
mkdir /tmp/squashfs
mkdir /tmp/tmpfs
mkdir /tmp/mergemount
sudo modprobe unionfs
sudo mount -o loop $1 /tmp/image
sudo mount -o loop -t squashfs /tmp/image/casper/filesystem.squashfs /tmp/squashfs
sudo mount -t tmpfs tmpfs /tmp/tmpfs
sudo mount -t unionfs -o dirs=/tmp/tmpfs:/tmp/squashfs=ro none /tmp/mergemount
sudo chroot /tmp/mergemount mount -t proc proc /proc
sudo chroot /tmp/mergemount mount -t sysfs sysfs /sys
sudo chroot /tmp/mergemount mkdir -p /dev/pts
sudo chroot /tmp/mergemount mount -t devpts devpts -o noexec,nosuid,gid=5,mode=620 /dev/pts
sudo cp /etc/resolv.conf /tmp/mergemount/etc/
LANG=C sudo chroot /tmp/mergemount su
LANG=C sudo chroot /tmp/mergemount su - apt-get clean
sudo chroot /tmp/mergemount rm /etc/resolv.conf
sudo chroot /tmp/mergemount umount /proc
sudo chroot /tmp/mergemount umount /sys
sudo chroot /tmp/mergemount umount /dev/pts
sudo chroot /tmp/mergemount rm -rf /dev/pts
echo -n 'do you want to build a squashfs with the changes ? (y/n) '
read yesno
if [ -z $yesno ];then
yesno='n'
fi
if [ $yesno = 'y' ];then
sudo mksquashfs /tmp/mergemount /tmp/filesystem.squashfs
fi
sudo umount /tmp/mergemount
sudo umount /tmp/tmpfs
sudo umount /tmp/squashfs
if [ $yesno = 'y' ];then
sudo cp /tmp/filesystem.squashfs /tmp/image/casper/
fi
sudo umount /tmp/image
sudo rm -rf /tmp/image /tmp/tmpfs /tmp/squashfs /tmp/mergemount /tmp/filesystem.squashfs
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