Install Debian via a serial console

debianttyinstall

#!/bin/sh

[ $# -eq 2 ] || exec echo "Usage: $0 <install.iso> <disk.img>"

for k in qemu kvm qemu-kvm; do
	which $k 2>/dev/null >/dev/null && kvm=$k && break
done
[ -n "$kvm" ] || exec echo "error: KVM not found!"

cores=$(nproc)
[ $cores -gt 4 ] && cpus="-smp cpus=$((cores / 2))"

root=/tmp/${0##*/}.$$
mkdir $root
sudo mount -r -oloop "$1" $root
$kvm -machine q35,accel=kvm -m 512 -no-reboot -nographic $cpus \
	-boot d -cdrom "$1" \
	-drive "file=$2,media=disk,format=raw,if=virtio" \
	-netdev user,id=hostnet0 \
	-device virtio-net-pci,netdev=hostnet0 \
	-kernel $root/install.*/vmlinuz -initrd $root/install.*/initrd.gz -append console=ttyS0
sudo umount $root
rmdir $root