#!/usr/bin/env bash
# 2018 Luke Shumaker
{
	set -euE
	image="$1"
	qemu=(
		qemu-system-x86_64
		-machine accel=kvm
		-m 512
	)

	mountpoint=$(mktemp -dt -- "${0##*/}.XXXXXXXXXX")
	trap "rmdir -- ${mountpoint@Q}" EXIT

	sudo unshare --mount sh -c "mount --make-rslave / && mount ${image@Q} ${mountpoint@Q} && install -Dm755 /dev/stdin /etc/runscript"
	"${qemu[@]}" -drive media=disk,format=raw,if=virtio,file="$1"
	sudo unshare --mount sh -c "mount --make-rslave / && mount ${image@Q} ${mountpoint@Q} && cat /var/log/runscript.out; exit \$(cat /var/log/runscript.status)"
}