mount -o loop boot.iso /mnt/cdrom
mkdir /tmp/bootiso
cd /mnt/cdrom
find . -print | cpio -pvdum /tmp/bootiso
cd /tmp/bootiso/isolinux
umount /mnt/cdrom
cp /mnt/src/slf5rolling/i386/sites/Fermi/build/isolinux/isolinux.cfg .
cd ..
/bin/rm -r TRANS.TBL
mkisofs -o /tmp/boot.iso -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -R -J -V "SLF 51 i386" .

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mount -o loop diskboot.img /mnt/cdrom
cp /mnt/src/slf5rolling/i386/sites/Fermi/build/isolinux/syslinux.cfg /mnt/cdrom/ 
umount /mnt/cdrom