FW: Using squashfs on /usr for a live cd

Kevin Annies kevinannies at hotmail.com
Tue Feb 6 07:26:39 PST 2007



> 
> 
> Hi,
> 
> I have a bootable cd which I am regularly updating but now space is a concern I would like to implement squashfs. I have implemented it on a static system and totally understand the theory of how it works. The part I can't work out is the following:
> 
> I am using an initial ram disk. As usual I have a file called linuxrc which gets executed,
> 
> Most of the file executes successfully. However here we go....
> 
> The following last few lines of the file are key to what make the livecd live
> 
>  mount -n -o ro -t iso9660 $LFS_CDROM_DEVICE $TMP_MOUNT
>   cd $TMP_MOUNT
>   pivot_root . mnt
>   umount -n /mnt/proc >/dev/null 2>&1
>   mount /usr.sqsh /usr -o loop
>   exec chroot . sh -c 'umount -n /mnt >/dev/null 2>&1;
>                 exec -a init.new /sbin/init 3' dev/console 2>&1
> 
> I have inserted the mount usr.sqsh command at this point because the following chroot command is executed from the just newly mounted / system. The pain is the chroot binary happens to be in /usr/bin which at this time is compressed. However, the archive does not uncompress at this time becuase the loop device does not exist on the initrd. I could try adding it but then woulit not become invalid as soon as I chroot? SO should I put the mount command in twice as a result or perhaps use a mount bind type of command? In addition could I add a second mount into one of the rc.d scripts?
> 
> I have also had a reference to instead use initramfs but am reluctant to go this route until I understand it better, do you suggest any material to read?
> 
> Appreciate any comments.
> 
> Thanks
> 
> Kevin 
> 
> 
> 
> 
> _________________________________________________________________
> Live Search: Better results, fast
> http://get.live.com/search/overview

_________________________________________________________________
Get connected - Use your Hotmail address to sign into Windows Live Messenger now. 
http://get.live.com/messenger/overview


More information about the livecd mailing list