unionfs?

subs at afortier.com subs at afortier.com
Fri Apr 22 10:38:45 PDT 2005


This is very good.   Quick question :)
How did you compile insmod, isoinfo,
losetup, mount, run-init, sh, and sleep
to be SSOO small in your initramfs?

Thanks
Robert



Alexander E. Patrakov wrote:
> On Thursday 21 April 2005 11:21, I wrote
> 
> 
>>use unionfs to pretend that the CD can be written to.
> 
> 
> A magic binary blob (klibc-based) that does this trick is available at:
> 
> http://ums.usu.ru/~patrakov/uniontest/initramfs_data.cpio.gz
> 
> It may or may not work with the current SVN livecd because I omitted reiser4 
> kernel patches and the unionfs kernel module may or may not fit.
> 
> Arbitrary file can be overwritten and even "deleted" from the livecd until the 
> reboot. This initramfs expects the following layout of the CD:
> 
> ./boot/isolinux
> ./boot/isolinux/boot.msg
> ./boot/isolinux/isolinux.bin
> ./boot/isolinux/isolinux.cfg
> ./boot/isolinux/linux
> ./boot/isolinux/options.msg
> ./boot/isolinux/splash.lss
> ./root.sqfs
> ./sources/binutils-2.15.94.0.2.2.tar.bz2
> <other sources>
> ./sources/zlib-1.2.2.tar.bz2
> 
> root.sqfs is produced by running the following commands:
> 
> umount -a # so that /proc and /sys are empty
>           # and /dev contains only the minimal set of nodes
> mksquashfs / /iso/root.sqfs -e /boot /lfs-livecd /iso /sources
> 
> As for bootscripts, the "mountkernfs" and "udev" scripts are needed in 
> addition to the standard livecd set. No need to mount squashed /usr or unpack 
> root.tar.gz and etc.tar.gz tarballs.
> 
> Sorry for not providing sources and makefiles. I have not yet scripted the 
> build procedure of this initramfs. Will do so in a day or two.
> 




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