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larry78723
Asked: 2020-01-01 18:30:19 +0800 CST

Error trying to build custom Ubuntu 18.04 iso using xorriso

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#!/bin/bash

# The example names get mapped to their roles here
orig_iso="$HOME"/iso/foxclone.iso
new_iso="$HOME"/iso/foxclone025-02.iso
mbr_template="$HOME"/isohdpfx.bin
workdir="$HOME"/work
echo $HOME
echo $workdir is workdir
# Extract MBR template file to disk
dd if="$orig_iso" bs=1 count=432 of="$mbr_template"

# Create the new ISO image
xorriso -as mkisofs \
   -U  \
   -allow-lowercase  \
   -r -V 'foxclone025-02' \
   -o "$new_iso" \
   -J -J -joliet-long \
   -isohybrid-mbr "$mbr_template" \
   -b "$workdir"/isolinux/isolinux.bin \   <--------  fails here. The file does exist at that location.
   -c isolinux/boot.cat \
   -boot-load-size 4 -boot-info-table -no-emul-boot \
   -eltorito-alt-boot \
   -e boot/grub/efi.img \
   -no-emul-boot -isohybrid-gpt-basdat -isohybrid-apm-hfsplus

Error in terminal I've been trying to fix this for 2 days, doing a crazy amount of research. Does anybody see anything that my old eyes have missed?

EDIT: Got it fixed by changing the line:

 xorriso -as mkisofs \

to

 xorriso -as mkisofs "$workdir" \

and removing the reference to $workdir in the -b line

bash iso

1 Answers

  1. the complaint of xorriso says that the -b file is not found in the ISO. In the command i see two reasons for this:

    1: You use the absolute disk path instead of the path in the ISO.

    2: There is no xorriso argument to see by which the file would get into the ISO. Actually no files at all seem to get mapped into the ISO.

    Proposal:

    If you want all files of "$workdir" in the ISO, add argument "$workdir".

    If you expect isolinux.bin to show up in /isolinux/ of the ISO, remove from the path of option -b the prefix "$workdir"/ so that the path complies to the prescription of both, mkisofs and xorrisofs (*).

    
xorriso -as mkisofs ... -b isolinux/isolinux.bin ... "$workdir"

    (*) mkisofs demands disk paths "relative to the source path", xorrisofs demands paths in the emerging ISO. Default working directory in the ISO is /. So the path "isolinux/isolinux.bin" is usable and advised for both.

    See how Debian packs up its x86 bootable ISOs in principle: https://wiki.debian.org/RepackBootableISO#Remove_the_unneeded_Jigdo_production_options

    (Support mailing list for xorriso is [email protected].)

    Have a nice day :)

    Thomas

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