Some of the parameters used in my genisoimage command don’t produce a bootable ISO image

[Mario Marietto]

Hello.

I'm trying to extract all the files from a (bootable) Debian ISO and then
re-generate a bootable ISO image. Below you can see the commands that I've
issued. For some unknown reason,the generated ISO image does not boot. Can
someone help me to understand why ? thanks.


apt update && apt -y install xorriso genisoimage

wget https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-11.5.0-amd64-netinst.iso

xorriso -osirrox on -indev debian-11.5.0-amd64-netinst.iso -extract / isofiles/

genisoimage -r -J -b isolinux/isolinux.bin -c isolinux/boot.cat
-no-emul-boot -boot-load-size 4 -boot-info-table -o
debian-11-unattended.iso isofiles


As you can see I haven't done any modification to the files inside the ISO
image,so the error should be most likely on the latest command.

According with this post :

https://unix.stackexchange.com/questions/572751/how-to-make-a-reproducible-iso-file-with-mkisofs-genisoimage

I have also tried with this command :


mkisofs -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot
-boot-load-size 4 -boot-info-table -J -R -v -T -V 'd-live 11.5.0 xf
amd64' "isofiles/" > file.iso


but also in this case the ISO produced is not bootable :
https://ibb.co/GstvTvR

I've omitted the parameter "*-reproducible-date=20221009*" because it
hasn't been accepted. The error produced is : *"genisoimage: Uh oh, I can't
find the boot image 'producible-date=20221009'* and the ISO produced is
only 32k.

This is how is the internal structure of the debian ISO file produced by
the command above :


# isoinfo -d -i debian-11-unattended.iso

CD-ROM is in ISO 9660 format
System id: LINUX
Volume id: d-live 11.5.0 xf amd64
Volume set id:
Publisher id:
Data preparer id:
Application id: GENISOIMAGE ISO 9660/HFS FILESYSTEM CREATOR (C) 1993
E.YOUNGDALE (C) 1997-2006 J.PEARSON/J.SCHILLING (C) 2006-2007 CDRKIT
TEAM
Copyright File id:
Abstract File id:
Bibliographic File id:
Volume set size is: 1
Volume set sequence number is: 1
Logical block size is: 2048
Volume size is: 224756
El Torito VD version 1 found, boot catalog is in sector 1020
Joliet with UCS level 3 found
Rock Ridge signatures version 1 found
Eltorito validation header:
    Hid 1
    Arch 0 (x86)
    ID ''
    Key 55 AA
    Eltorito defaultboot header:
        Bootid 88 (bootable)
        Boot media 0 (No Emulation Boot)
        Load segment 0
        Sys type 0
        Nsect 4
        Bootoff 3FD 1021


You can also give a look at this full log,maybe you find the reason of the
failure :

pastebin.ubuntu.com/p/XyJKSf2mK8

I guess the error could be :


xorriso : NOTE : Detected El-Torito boot information which currently
is set to be discarded"

but I don't know,really. Im dealing with this error from 1 week,I have
asked help

in a lot of places,but no one really understood why. I hope you can.


-- 
Mario.
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