centos embed kickstart in iso

patch.sh

#!/usr/bin/env bash

# dependencies: bsdtar xorriso isomd5sum

iso="CentOS-8.2.2004-x86_64-boot.iso"
#iso="CentOS-8.2.2004-x86_64-dvd1.iso"
ks="./kickstart-centos8.cfg"

wd="isobuild"

ks="$(realpath "$ks")"

mkdir -p "$wd"
newiso="${iso%.*}-kickstart-template.iso"
echo "Working in $wd"

cd "$wd"

test -f "$iso" || curl -Lo "$iso" "https://mirror.netcologne.de/centos/8/isos/x86_64/$iso"
test -f "$newiso" && rm -v "$newiso"
test -d cd && rm -rf cd

mkdir cd
bsdtar -C cd/ -xf "$iso"

sed -ri 's|^timeout [0-9]+|timeout 50|' cd/isolinux/isolinux.cfg
sed -i 's|rd.live.check|rd.live.check text inst.ks=cdrom:/ks.cfg inst.loglevel=debug|' cd/isolinux/isolinux.cfg

cp -a "$ks" cd/ks.cfg

mkisofs -J -joliet-long -V "CentOS-8-BaseOS-x86_64" -volset "CentOS-8-BaseOS-x86_64" -A "CentOS-8-BaseOS-x86_64" -U -o "$newiso" -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -v cd/

implantisomd5 "$newiso"