working scripts

.gitignore

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+*.iso
+preseed.cfg

docker.sh

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+#!/usr/bin/env bash
+
+apt-get update
+apt-get install -y xorriso genisoimage
+
+cd /root/unattended
+genisoimage -r -J -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -o $(ls | grep "netinst.iso" | sed 's/netinst/unattended/') isofiles
+chown 1000:1000 $(ls | grep "netinst.iso" | sed 's/netinst/unattended/')

unattended.sh

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+#!/usr/bin/env bash
+
+xorriso -osirrox on -indev debian-11.3.0-amd64-netinst.iso -extract / isofiles
+sudo sed -i '/vesamenu.c32/d' isofiles/isolinux/isolinux.cfg
+if [[ $(grep timeout_style isofiles/boot/grub/grub.cfg) == "" ]]; then sudo sed -i 's/insmod play/set timeout_style=hidden\nset timeout=0\nset default=1\n\ninsmod play/' isofiles/boot/grub/grub.cfg; fi
+
+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 a+w md5sum.txt
+md5sum $(find -follow -type f) > md5sum.txt
+chmod a-w md5sum.txt
+cd ..
+
+chmod a+w isofiles/isolinux/isolinux.bin
+docker run --interactive --tty --rm --volume $(pwd):/root/unattended debian:buster /root/unattended/docker.sh
+sudo rm -rf isofiles