Updating a rfs

[Christian Gmeiner]

Hi all,

this is not a busybox specific issue, but maybe busybox can help me to solve it.
I have a linux system, which has a ext2 partition mounted as /. Now I
want to use
busybox as "ext2-format-and-tar.bz2-extractor" to "install" a new
version of the rfs.
I thought about using a statically linked busybox rfs, which I can
chroot/pivot_root into.

This is what I want to do:

1) chroot/pivot_root into busybox rfs located in tmpfs /tmp/chroot
2) mount all needed kernel file system (/proc /sys ...)
3) now it should umount the old /, but I am not sure how?
4) mkfs.ext2 /dev/sda2
5) mount /dev/sda2 into busybox root - lets say mount to /mnt/
6) run something like tar pjxf rfs.tar.bz2  -C /mnt/
7) umount everything and do a reboot

Is something like this possible? Has anybody experiences with this topic.

thanks
--
Christian Gmeiner, MSc