CentOS - Jul 2012 - Modifying a netinstall ISO image

I want to make a very minor change to the netinstall ISO image, namely adding a
few parameters to the boot line to automatically kick off a kickstart
installation.  Here is my approach:

  mount -o loop CentOS-6.2-i386-netinstall.iso /mnt
  cp -pr /mnt /tmp
  cd /tmp/mnt
  vi isolinux/isolinux.cfg  # Add some stuff to the default append line and
reduce timeout
  mkisofs -o /tmp/CentOS-6.2-i386-netinstall-ks.iso -b isolinux/isolinux.bin -c
isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -R -J -v -T .

I got the mkisofs command line from
http://www.centos.org/docs/5/html/5.2/Installation_Guide/s2-steps-make-cd.html
(I couldn't find anything similar in the CentOS/RHEL 6.X documentation).

This appears to work just fine, but the resulting ISO image is about 20% bigger
(194M vs. 162M) and has an extra TRANS.TBL file at the top level.  Any ideas
what is causing this?  It's no big deal as I've got things working, but
I'm curious nonetheless...

Alfred

Hello Alfred,

On Fri, 2012-07-27 at 14:59 -0400, Alfred von Campe
wrote:
> This appears to work just fine, but the resulting ISO image is about
> 20% bigger (194M vs. 162M) and has an extra TRANS.TBL file at the top
> level.  Any ideas what is causing this?  It's no big deal as I've
got
> things working, but I'm curious nonetheless...
man mkisofs should give you an explanation of the used options. The
directory record options used (-J, -R and -T) probably increase the ISO
size compared to when those aren't used.

Regards,
Leonard.

-- 
mount -t life -o ro /dev/dna /genetic/research

> This appears to work just fine, but the resulting ISO image is about 20%
bigger (194M vs. 162M)
> and has an extra TRANS.TBL file at the top level.  Any ideas what is
causing this?  It's no big
> deal as I've got things working, but I'm curious nonetheless...
And that is just about the size of the duplicate initrd.img file.

If you are going to ignore the manual page you posted and include the images
directory, hard link
the duplicate file and re-author :)

jlc