#!/bin/bash

NAME=NAME_PLACEHOLDER

NIX_DISK_IMAGE=$(readlink -f ${NIX_DISK_IMAGE:-./${NAME}.qcow2})

if ! test -e "$NIX_DISK_IMAGE"; then
    qemu-img create -f qcow2 "$NIX_DISK_IMAGE" 512M || exit 1
fi

# Create a directory for storing temporary data of the running VM.
if [ -z "$TMPDIR" -o -z "$USE_TMPDIR" ]; then
    TMPDIR=$(mktemp -d nix-vm.XXXXXXXXXX --tmpdir)
fi

# Create a directory for exchanging data with the VM.
mkdir -p $TMPDIR/xchg
cd $TMPDIR

NIX_SYSTEM="NIX_SYSTEM_PLACEHOLDER"

# Start QEMU.
qemu-system-x86_64 -enable-kvm \
    -name NAME_PLACEHOLDER \
    -m 1024 \
    -smp 1 \
    -device virtio-rng-pci \
    -net nic,netdev=user.0,model=virtio -netdev user,id=user.0${QEMU_NET_OPTS:+,$QEMU_NET_OPTS} \
    -spice port=5900,addr=127.0.0.1,disable-ticketing,image-compression=off,seamless-migration=on \
    -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
    -virtfs local,path=/nix/store,security_model=none,mount_tag=store,readonly \
    -virtfs local,path=$TMPDIR/xchg,security_model=none,mount_tag=xchg \
    -virtfs local,path=${SHARED_DIR:-$TMPDIR/xchg},security_model=none,mount_tag=shared \
    -drive index=0,id=drive$((0 + 1)),file=$NIX_DISK_IMAGE,cache=writeback,werror=report,if=virtio \
    -kernel ${NIX_SYSTEM}/kernel \
    -initrd ${NIX_SYSTEM}/initrd \
    -append "$(cat ${NIX_SYSTEM}/kernel-params) init=${NIX_SYSTEM}/init regInfo=/nix/store/622pn30mg7z4knkrqsh3acrjyaiyq6sr-closure-info/registration" \
    -device qxl-vga,vgamem_mb=256 #-display gtk