Created
October 8, 2025 09:01
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#!/bin/sh | |
orig_iso="$HOME/Downloads/debian-12.1.0-amd64-netinst.iso" | |
new_files="$HOME/Desktop/ISOFILES" | |
new_iso="$HOME/Desktop/debian-12.1.0-amd64-modified.iso" | |
iso_name="Debian 12.1.0 amd64 n" | |
mbr_template=isohdpfx.bin | |
mkdir -p $new_files | |
xorriso -osirrox on -indev $orig_iso -extract / $new_files | |
chmod +w -R ISOFILES/install.amd/ | |
gunzip ISOFILES/install.amd/initrd.gz | |
echo preseed.cfg | cpio -H newc -o -A -F ISOFILES/install.amd/initrd | |
gzip ISOFILES/install.amd/initrd | |
chmod -w -R ISOFILES/install.amd/ | |
cd ISOFILES | |
chmod +w md5sum.txt | |
find -follow -type f ! -name md5sum.txt -print0 | xargs -0 md5sum > md5sum.txt | |
chmod -w md5sum.txt | |
cd .. | |
# Extract MBR template file to disk | |
dd if="$orig_iso" bs=1 count=432 of="$mbr_template" | |
# Create the new ISO image | |
xorriso -as mkisofs \ | |
-r -V "$iso_name" \ | |
-o "$new_iso" \ | |
-J -J -joliet-long -cache-inodes \ | |
-isohybrid-mbr "$mbr_template" \ | |
-b isolinux/isolinux.bin \ | |
-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 \ | |
"$new_files" |
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