Move live usb persistent files into compressed squashfs.

mv2squashfs.sh

#!/bin/bash

if [ -z `which mksquashfs` ]; then
    sudo aptitude update
    sudo aptitude install squashfs-tools
fi

sudo mount /cdrom -o remount,rw
EXCLUDES='.wh* cdrom etc home lost+found medoa rofs root tmp* var/backups var/cache var/crash var/log var/run var/spool var/tmp'

if [ -e /cdrom/casper/update.squashfs ]; then
    if [ -z `which mount.aufs` ]; then
#    sudo aptitude update
	sudo aptitude install aufs-tools
    fi
    echo mounting existing image.
    cd /
    sudo mkdir /tmpsqfs /tmprwfs
    sudo mount -t squashfs -o loop /cdrom/casper/update.squashfs /tmpsqfs
    sudo mount -t ext3 -o loop /cdrom/casper-rw /tmprwfs
    sudo mount -t aufs -o br:/tmprwfs=rw:/tmpsqfs=ro none /mnt
    sudo mksquashfs /mnt /cdrom/casper/update-new.squashfs -info -noappend -wildcards -e ${EXCLUDES}
    if [ -e /cdrom/casper/update-new.squashfs ]; then
    cd /cdrom/casper
    echo renaming new squashfs image.
    sudo mv update.squashfs update.squashfs.old
    sudo mv update-new.squashfs update.squashfs
    echo deleting moved files.
    cd /tmprwfs
    sudo rm -rf bin sbin usr lib var/lib
    cd /
    sudo sync
    fi
    sudo umount /mnt
    sudo umount /tmpsqfs
    sudo umount /tmprwfs
    sudo rmdir /tmpsqfs /tmprwfs
else
    echo mounting existing image.
    cd /
    sudo mount -t ext3 -o loop /cdrom/casper-rw /mnt
    sudo mksquashfs /mnt /cdrom/casper/update.squashfs -info -noappend -wildcards -e ${EXCLUDES}
    if [ -e /cdrom/casper/update.squashfs ]; then
    echo deleting moved files.
    cd /mnt
    sudo rm -rf bin sbin usr lib var/lib
    cd /
    sudo sync
    fi
    sudo umount /mnt
fi