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How to edit openSUSE live CD

OpenSUSE use lzma compressions for live CD, you could find more info on http://lizards.opensuse.org/2009/04/28/whats-behind-lzma-compressed-live... and http://lizards.opensuse.org/2009/05/15/livecd-performance-clicfs-vs-squa...
At first you need package clicfs, it's in suse distro since 11.2 but you could find some builds in https://build.opensuse.org/ also for older products. Of course you need also live CD, you could find
latest automatically build ISO's here : http://download.opensuse.org/factory/iso/

zypper in clicfs
mkdir /mnt/iso
mkdir /mnt/iso_unpacked_clicfs/
mkdir /mnt/iso_filesystem/
mkdir /tmp/new_cd

mount -o loop  ~/openSUSE-KDE4-LiveCD-i686-Build0233-Media.iso /mnt/iso/
ls /mnt/iso/
boot  config.isoclient  dummy  GPLv2.txt  GPLv3.txt  openSUSE-kde-11.2-livecd-kde-read-only.i686-2.8.0  syslinux.cfg

clicfs /mnt/iso/openSUSE-kde-11.2-livecd-kde-read-only.i686-2.8.0 /mnt/iso_unpacked_clicfs/
ls /mnt/iso_unpacked_clicfs/
fsdata.ext3
cp /mnt/iso_unpacked_clicfs/fsdata.ext3 /tmp/new_cd/fsdata.ext3

mount -o loop /tmp/fsdata.ext3 /mnt/iso_filesystem/
ls /mnt/iso_filesystem/
bin  boot  dev  etc  home  image  lib  license.tar.gz  lost+found  media  mnt  opt  proc  root  sbin  selinux  srv  sys  tmp  usr  var

drop unneeded doc directory we could free ~100MB
rm /mnt/iso_filesystem/usr/share/doc

now you could do changes in /mnt/iso_filesystem/
after finishing work, unmount data
umount /mnt/iso_filesystem/

copy all needed files from mounted CD
cp -r  /mnt/iso/* /tmp/new_cd/

and overwrite data file where is filesystem stored
mkclicfs /tmp/new_cd/fsdata.ext3 /tmp/new_cd/openSUSE-kde-11.2-livecd-kde-read-only.i686-2.8.0

finally remove fsdata.ext3
rm /tmp/new_cd/fsdata.ext3

now we have directory prepared to create ISO so we could launch mkisofs :
cd /tmp/new_cd/
mkisofs -r -l -o /tmp/new.iso -b boot/i386/loader/isolinux.bin -c boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table .

if everything goes ok we should have create our modified iso /tmp/new.iso

also don't forget to clean up mounted filesystems

fusermount -u /mnt/iso_unpacked_clicfs/
umount /mnt/iso/

  • By mseben at 08/19/2009 - 15:10