#!/bin/bash
set -eux

ISO_URL="https://dl-cdn.alpinelinux.org/alpine/v3.22/releases/x86_64/alpine-virt-3.22.2-x86_64.iso"

# from vm to make a shared folder
if [ $# -lt 1 ] ; then
	echo """
		ISO=${1:-$(basename $ISO_URL)}
		IMG=${2:-disc_alpine.qcow2}
		SIZE=${3:-16G}
		RAM=${4:-2G}
		CPUS=${5:-2}
		SHARE=${6:-$PWD/share}
	"""
	echo "cheat sheet: mount -t 9p -o trans=virtio hostshare /mnt"
	exit 1
fi

# --- Configurable defaults ---
ISO=${1:-$(basename $ISO_URL)}
IMG=${2:-disc_alpine.qcow2}
SIZE=${3:-16G}
RAM=${4:-2G}
CPUS=${5:-2}
SHARE=${6:-$PWD/share}

# --- Setup ---
mkdir -p "$SHARE"
echo "iso = $ISO"
[ -f "$ISO" ] || wget "$ISO_URL"
[ -f "$IMG" ] || qemu-img create -o nocow=on -f qcow2 "$IMG" "$SIZE"

# --- Optional install script ---
# Drop any file named install.sh in ./share to execute it inside the VM later:
# e.g. `bash /mnt/share/install.sh` after mounting



qemu-system-x86_64 \
	-m $RAM \
	-nic user \
	-boot once=d \
	-cdrom $ISO \
	-drive file=$IMG \
	-display none \
	-device virtio-vga \
	-display default,show-cursor=on \
	-net user,hostfwd=tcp::7777-:22
	#-virtfs local,id=share,path="$SHARE",security_model=none,mount_tag=hostshare
	-device virtio-vga \
	-enable-kvm \
	-display default,show-cursor=on \
	-display none \
	-virtfs local,id=share,path="$SHARE",security_model=none,mount_tag=hostshare

## --- Run QEMU with graphics + shared folder ---
#qemu-system-x86_64 \
#  -enable-kvm \
#  -m "$RAM" \
#  -cpu host \
#  -smp "$CPUS" \
#  -boot d \
#  -cdrom "$ISO" \
#  -drive file="$IMG",format=qcow2 \
#  -device virtio-vga \
#  -display default,show-cursor=on \
#  -nic user,hostfwd=tcp::2222-:22 \
#  -virtfs local,id=share,path="$SHARE",security_model=none,mount_tag=hostshare