reboot-buildroot.js

#!/usr/bin/env node

import url from "node:url";

const __dirname = url.fileURLToPath(new URL(".", import.meta.url));

const TEST_RELEASE_BUILD = +process.env.TEST_RELEASE_BUILD;
const { V86 } = await import(TEST_RELEASE_BUILD ? "../../build/libv86.mjs" : "../../src/main.js");

process.on("unhandledRejection", exn => { throw exn; });

const config = {
    bios: { url: __dirname + "/../../bios/seabios.bin" },
    vga_bios: { url: __dirname + "/../../bios/vgabios.bin" },
    bzimage: { url: __dirname + "/../../images/buildroot-bzimage.bin" },
    net_device: {
        relay_url: "fetch",
        type: "ne2k",
    },
    cmdline: "tsc=reliable mitigations=off random.trust_cpu=on",
    autostart: true,
    memory_size: 32 * 1024 * 1024,
    filesystem: {},
    virtio_console: true,
    log_level: 0,
    disable_jit: +process.env.DISABLE_JIT,
};

const emulator = new V86(config);

let did_reboot = false;
let reboot_finished = false;
let did_send_echo = false;
let serial_text = "";

const timeout = setTimeout(() => {
    console.log(serial_text);
    throw new Error("Timeout");
}, 60 * 1000);

emulator.add_listener("serial0-output-byte", function(byte)
{
    var chr = String.fromCharCode(byte);
    process.stdout.write(chr);
    serial_text += chr;

    if(did_reboot)
    {
        if(serial_text.endsWith("Files send via emulator appear in /mnt/"))
        {
            reboot_finished = true;
        }

        if(did_send_echo)
        {
            if(serial_text.endsWith("finished"))
            {
                console.log("Ok");
                emulator.destroy();
                clearTimeout(timeout);
            }
        }
        else if(reboot_finished && serial_text.endsWith("~% "))
        {
            console.log("running echo");
            emulator.serial0_send("echo fini''shed\n");
            serial_text = "";
            did_send_echo = true;
        }
    }
    else
    {
        if(serial_text.endsWith("~% "))
        {
            console.log("rebooting");
            emulator.serial0_send("reboot\n");
            serial_text = "";
            did_reboot = true;
        }
    }
});