Updating squashfs filesystem

[Cyril Jaquier <cyril.jaquier@jaqpot.net>]

Hi all,

I'm building a Debian live image for an embedded system. I would like to 
be able to upgrade the system "on the fly", probably using a web 
interface. Is it possible to replace a squashfs file at runtime? I 
thought about something like:

1/ remount /live/image as rw
2/ copy the new squashfs image over /live/image/live/filesystem.squashfs
3/ copy the new kernel and initrd
4/ remount /live/image as ro
5/ reboot

I doubt this is a recommended process :P But do you know if it could 
work? What about aufs? Are there any other solutions to upgrade the 
whole system?

Thank you.

Cyril