Help on building custom iso images

[Attilio Fiandrotti <fiandro@tiscalinet.it>]

Hi

i'm trying to build custom sarge iso images to test the graphical 
installer, this is how i proceed (as root user)

- cd ~
- download sarge-i366-netinst.iso
- mkdir /mnt/iso
- mkdir /root/d-i_hacked_iso
- mount -o loop /root/sarge-i386-netinst.iso /mnt/iso
- cp -ra /mnt/iso/* /root/d-i_hacked_iso/
- mkisofs -o sarge-i386-netinst.iso -r -b isolinux/isolinux.bin -c 
isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table 
./d-i_hacked_iso/

The iso image is then created successfully, it can be booted both from 
qemu or real system, but the valid_cdrom() function in cdrom checker 
fails since the cdrom is not automatically mounted in /cdrom.
If i mount the netins cdrom by hand in /cdrom then everyhing goes fine: 
could someone please tell me why i cannot get correctly working iso images?

thanks

attilio