#!/bin/bash
# Check which virtualization technology to use
# We prefer kvm, kqemu, userspace in that order.

# This script is based on https://github.com/dracutdevs/dracut/blob/master/test/run-qemu

export PATH=/sbin:/bin:/usr/sbin:/usr/bin

[[ -x /usr/bin/qemu ]] && BIN=/usr/bin/qemu && ARGS="-cpu max"
$(lsmod | grep -q '^kqemu ') && BIN=/usr/bin/qemu && ARGS="-kernel-kqemu -cpu host"
[[ -c /dev/kvm && -x /usr/bin/kvm ]] && BIN=/usr/bin/kvm && ARGS="-cpu host"
[[ -c /dev/kvm && -x /usr/bin/qemu-kvm ]] && BIN=/usr/bin/qemu-kvm && ARGS="-cpu host"
[[ -c /dev/kvm && -x /usr/libexec/qemu-kvm ]] && BIN=/usr/libexec/qemu-kvm && ARGS="-cpu host"
[[ -x /usr/bin/qemu-system-$(uname -i) ]] && BIN=/usr/bin/qemu-system-$(uname -i) && ARGS="-cpu max"
[[ -c /dev/kvm && -x /usr/bin/qemu-system-$(uname -i) ]] && BIN=/usr/bin/qemu-system-$(uname -i) && ARGS="-enable-kvm -cpu host"

[[ $BIN ]] || {
   echo "Could not find a working KVM or QEMU to test with!" >&2
   echo "Please install kvm or qemu." >&2
   exit 1
}

exec $BIN $ARGS "$@"