feat: Improve entrypoint (#423)

trap - ERR

version=$(qemu-system-x86_64 --version | head -n 1 | cut -d '(' -f 1 | awk '{ print $NF }')

cmd=(qemu-system-x86_64)

version=$("${cmd[@]}" --version | awk 'NR==1 { print $4 }')

info "Booting ${APP}${BOOT_DESC} using QEMU v$version..."

[[ "$SHUTDOWN" != [Yy1]* ]] && exec qemu-system-x86_64 ${ARGS:+ $ARGS}

if [[ "$SHUTDOWN" != [Yy1]* ]]; then

  exec "${cmd[@]}" ${ARGS:+ $ARGS}

fi

qemu-system-x86_64 ${ARGS:+ $ARGS} &

"${cmd[@]}" ${ARGS:+ $ARGS} &

rc=0

wait $! || rc=$?