tar stream 3.1 bug repro

.gitignore

@@ -1,5 +1,10 @@
 rootfs.ext4
+rootfs.qcow2
+fireactions
+*.ext4
+*.squashfs
+*.config.json
 vmlinux.bin
 node_modules/
 
-build.cjs
+*.log

agent/index.js

@@ -0,0 +1,184 @@
+import { nanoid } from "nanoid";
+// import { WebSocketServer } from "ws";
+import { execFile as _execFile, spawn } from "node:child_process";
+import { open, readFile, rm } from "node:fs/promises";
+import { createServer } from "node:http";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { promisify } from "node:util";
+const execFile = promisify(_execFile);
+// const spawn = promisify(_spawn);
+
+const secret = await parseSecret();
+
+// const wsServer = new WebSocketServer({ noServer: true });
+const server = createServer(async (req, res) => {
+  try {
+    await handler(req, res);
+  } catch (error) {
+    console.error("Error manejando", req.url, error);
+    res.destroy();
+  }
+});
+
+/** @type {Map<string, {listeners: ((data: Buffer | null) => void)[], prev: Buffer, statusCode: null | number}>} */
+let runs = new Map();
+
+// server.on("upgrade", (req, socket, head) => {
+//   const url = getUrl(req)
+//   let matches;
+//   if ((matches = url.pathname.match(runWebSocketRegexp))) {
+//     const runId = matches[1];
+//       if (!listeners.has(runId)) {
+// return
+//     }
+//       wsServer.handleUpgrade(req, socket,head,(client,request)=>{
+
+//     })
+//   }
+// });
+
+/**
+ * @param {string} runId
+ * @param {Buffer} chunk
+ */
+function writeToRun(runId, chunk) {
+  const run = runs.get(runId);
+  if (!run) throw new Error(`runId ${runId} doesn't exist`);
+  run.prev = Buffer.concat([run.prev, chunk]);
+  for (const listener of run.listeners) {
+    listener(chunk);
+  }
+}
+
+/**
+ * @param {string} runId
+ */
+function closeRun(runId) {
+  const run = runs.get(runId);
+  if (!run) throw new Error(`runId ${runId} doesn't exist`);
+  for (const listener of run.listeners) {
+    listener(null);
+  }
+}
+
+const runWebSocketRegexp = /^\/run\/(.+)$/;
+
+/**
+ * @param {import("http").IncomingMessage} req
+ * @param {import("http").ServerResponse<import("http").IncomingMessage> & { req: import("http").IncomingMessage; }} res
+ */
+async function handler(req, res) {
+  // prettier-ignore
+  const url = getUrl(req);
+  auth(secret, req, res);
+  let matches;
+  if (url.pathname === "/hello") {
+    if (req.method === "GET") {
+      return res.writeHead(200).end("Ey!");
+    } else return res.writeHead(405).end("method not allowed");
+  } else if (url.pathname === "/run") {
+    if (req.method === "POST") {
+      const runId = nanoid();
+      runs.set(runId, {
+        listeners: [],
+        prev: Buffer.from([]),
+        statusCode: null,
+      });
+      const execPath = join(tmpdir(), "fireactions-agent-exec-" + nanoid());
+      {
+        const execFile = await open(execPath, "w", 0o700);
+        await new Promise((resolve, reject) =>
+          req.pipe(execFile.createWriteStream()).addListener("finish", () => {
+            resolve(void 0);
+          })
+        );
+      }
+      const proc = spawn(execPath, [], {});
+      proc.stdout.on("data", async (/** @type {Buffer} */ chunk) => {
+        writeToRun(runId, chunk);
+      });
+      proc.stderr.on("data", async (/** @type {Buffer} */ chunk) => {
+        writeToRun(runId, chunk);
+      });
+      proc.on("close", async (code) => {
+        const run = runs.get(runId);
+        if (!run) return panic();
+        runs.set(runId, { ...run, statusCode: code });
+        closeRun(runId);
+        await rm(execPath);
+      });
+      return res.writeHead(200).end(JSON.stringify({ runId }));
+    } else return res.writeHead(405).end("method not allowed");
+  } else if ((matches = url.pathname.match(runWebSocketRegexp))) {
+    const runId = matches[1];
+    const run = runs.get(runId);
+    if (!run) {
+      return res.writeHead(404).end("run not found");
+    }
+    res.writeHead(200, {
+      "content-type": "text/event-stream",
+      Connection: "keep-alive",
+      "Cache-Control": "no-cache",
+      "Access-Control-Allow-Origin": "*",
+    });
+    const listener = (/** @type {Buffer | null} */ data) => {
+      if (data === null) return res.end();
+      res.write(
+        "event: stdsmth\n" + `data: ${JSON.stringify(data.toString())}\n\n`
+      );
+    };
+    listener(run.prev);
+    // TODO: remove listener when request closed
+    runs.set(runId, { ...run, listeners: [...run.listeners, listener] });
+  } else {
+    return res.writeHead(404).end("not found");
+  }
+}
+
+/**
+ * @param {import("http").IncomingMessage} req
+ */
+function getUrl(req) {
+  // prettier-ignore
+  const urlString = /** @type {string} */(req.url);
+  const url = new URL(urlString, `http://${req.headers.host}`);
+  return url;
+}
+
+/**
+ * @returns {Promise<string>}
+ */
+async function parseSecret() {
+  const cmdline = await readFile("/proc/cmdline", "utf-8");
+  for (const opt of cmdline.split(" ")) {
+    const [key, value] = opt.split("=");
+    if (key === "fireactions.secret") {
+      if (value.length < 5) throw new Error("valor muy corto");
+      return value;
+    }
+  }
+  throw new Error("no hay secreto");
+}
+
+/**
+ * @param {string} secret
+ * @param {import("http").IncomingMessage} req
+ * @param {import("http").ServerResponse<import("http").IncomingMessage> & { req: import("http").IncomingMessage; }} res
+ */
+function auth(secret, req, res) {
+  const url = getUrl(req);
+  const auth = req.headers.authorization
+    ? req.headers.authorization.slice("Bearer ".length)
+    : url.searchParams.get("token");
+  if (auth !== secret) {
+    res.writeHead(401).end("wrong secret");
+    throw new Error("unauthorized");
+  }
+}
+
+server.listen("8080");
+
+function panic() {
+  throw new Error("Function not implemented.");
+}

agent/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "agent",
+  "type": "module",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "@tsconfig/node16": "^1.0.4",
+    "@types/node": "^20.2.5",
+    "@types/ws": "^8.5.4"
+  },
+  "dependencies": {
+    "nanoid": "^4.0.2",
+    "ws": "^8.13.0"
+  }
+}

agent/pnpm-lock.yaml

@@ -0,0 +1,59 @@
+lockfileVersion: '6.1'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+dependencies:
+  nanoid:
+    specifier: ^4.0.2
+    version: 4.0.2
+  ws:
+    specifier: ^8.13.0
+    version: 8.13.0
+
+devDependencies:
+  '@tsconfig/node16':
+    specifier: ^1.0.4
+    version: 1.0.4
+  '@types/node':
+    specifier: ^20.2.5
+    version: 20.2.5
+  '@types/ws':
+    specifier: ^8.5.4
+    version: 8.5.4
+
+packages:
+
+  /@tsconfig/node16@1.0.4:
+    resolution: {integrity: sha512-vxhUy4J8lyeyinH7Azl1pdd43GJhZH/tP2weN8TntQblOY+A0XbT8DJk1/oCPuOOyg/Ja757rG0CgHcWC8OfMA==}
+    dev: true
+
+  /@types/node@20.2.5:
+    resolution: {integrity: sha512-JJulVEQXmiY9Px5axXHeYGLSjhkZEnD+MDPDGbCbIAbMslkKwmygtZFy1X6s/075Yo94sf8GuSlFfPzysQrWZQ==}
+    dev: true
+
+  /@types/ws@8.5.4:
+    resolution: {integrity: sha512-zdQDHKUgcX/zBc4GrwsE/7dVdAD8JR4EuiAXiiUhhfyIJXXb2+PrGshFyeXWQPMmmZ2XxgaqclgpIC7eTXc1mg==}
+    dependencies:
+      '@types/node': 20.2.5
+    dev: true
+
+  /nanoid@4.0.2:
+    resolution: {integrity: sha512-7ZtY5KTCNheRGfEFxnedV5zFiORN1+Y1N6zvPTnHQd8ENUvfaDBeuJDZb2bN/oXwXxu3qkTXDzy57W5vAmDTBw==}
+    engines: {node: ^14 || ^16 || >=18}
+    hasBin: true
+    dev: false
+
+  /ws@8.13.0:
+    resolution: {integrity: sha512-x9vcZYTrFPC7aSIbj7sRCYo7L/Xb8Iy+pW0ng0wt2vCJv7M9HOMy0UoN3rr+IFC7hb7vXoqS+P9ktyLLLhO+LA==}
+    engines: {node: '>=10.0.0'}
+    peerDependencies:
+      bufferutil: ^4.0.1
+      utf-8-validate: '>=5.0.2'
+    peerDependenciesMeta:
+      bufferutil:
+        optional: true
+      utf-8-validate:
+        optional: true
+    dev: false

agent/tsconfig.json

@@ -0,0 +1,8 @@
+{
+  "extends": "@tsconfig/node16/tsconfig.json",
+  "exclude": ["build.js/", "build/"],
+  "compilerOptions": {
+    "allowJs": true,
+    "checkJs": true
+  }
+}

fcnet.conflist

@@ -0,0 +1,18 @@
+{
+  "name": "fcnet",
+  "cniVersion": "0.4.0",
+  "plugins": [
+    {
+      "type": "ptp",
+      "ipMasq": true,
+      "ipam": {
+        "type": "host-local",
+        "subnet": "192.168.127.0/24",
+        "resolvConf": "/etc/resolv.conf"
+      }
+    },
+    {
+      "type": "tc-redirect-tap"
+    }
+  ]
+}

go.mod

@@ -0,0 +1,51 @@
+module gitea.nulo.in/Nulo/fireactions
+
+go 1.20
+
+require (
+	github.com/PuerkitoBio/purell v1.1.1 // indirect
+	github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect
+	github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d // indirect
+	github.com/containerd/fifo v1.0.0 // indirect
+	github.com/containernetworking/cni v1.0.1 // indirect
+	github.com/containernetworking/plugins v1.0.1 // indirect
+	github.com/firecracker-microvm/firecracker-go-sdk v1.0.0 // indirect
+	github.com/go-openapi/analysis v0.21.2 // indirect
+	github.com/go-openapi/errors v0.20.2 // indirect
+	github.com/go-openapi/jsonpointer v0.19.5 // indirect
+	github.com/go-openapi/jsonreference v0.19.6 // indirect
+	github.com/go-openapi/loads v0.21.1 // indirect
+	github.com/go-openapi/runtime v0.24.0 // indirect
+	github.com/go-openapi/spec v0.20.4 // indirect
+	github.com/go-openapi/strfmt v0.21.2 // indirect
+	github.com/go-openapi/swag v0.21.1 // indirect
+	github.com/go-openapi/validate v0.22.0 // indirect
+	github.com/go-stack/stack v1.8.1 // indirect
+	github.com/golang-jwt/jwt v3.2.2+incompatible // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/hashicorp/errwrap v1.0.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
+	github.com/jaevor/go-nanoid v1.3.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/labstack/echo/v4 v4.10.2 // indirect
+	github.com/labstack/gommon v0.4.0 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.17 // indirect
+	github.com/mitchellh/mapstructure v1.4.3 // indirect
+	github.com/oklog/ulid v1.3.1 // indirect
+	github.com/opentracing/opentracing-go v1.2.0 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/sirupsen/logrus v1.8.1 // indirect
+	github.com/valyala/bytebufferpool v1.0.0 // indirect
+	github.com/valyala/fasttemplate v1.2.2 // indirect
+	github.com/vishvananda/netlink v1.1.1-0.20210330154013-f5de75959ad5 // indirect
+	github.com/vishvananda/netns v0.0.0-20210104183010-2eb08e3e575f // indirect
+	go.mongodb.org/mongo-driver v1.8.3 // indirect
+	golang.org/x/crypto v0.6.0 // indirect
+	golang.org/x/net v0.7.0 // indirect
+	golang.org/x/sys v0.5.0 // indirect
+	golang.org/x/text v0.7.0 // indirect
+	golang.org/x/time v0.3.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)

js/.gitignore

@@ -0,0 +1,2 @@
+# compiled typescript
+container-baby.js

js/container-baby.ts

@@ -0,0 +1,198 @@
+import { execFile as _execFile } from "node:child_process";
+import { mkdtemp, open, rm } from "node:fs/promises";
+import { join } from "node:path";
+import { Writable } from "node:stream";
+import { promisify } from "node:util";
+import { tar2squashfs } from "./tar2squashfs.js";
+const execFile = promisify(_execFile);
+
+type RegistryName = string;
+type RegistrySecret = string;
+let tokenCache = new Map<RegistryName, Promise<RegistrySecret>>();
+
+const tmp = await mkdtemp("sexy-chambelan-");
+try {
+  console.debug(tmp);
+
+  const image = "gitea.nulo.in/nulo/zulip-checkin-cyborg";
+  const tag = "latest";
+  const arch = "amd64";
+
+  const manifest = await getContainerManifest(image, tag);
+  if (
+    !manifest.layers.every(
+      (layer) =>
+        layer.mediaType === "application/vnd.oci.image.layer.v1.tar" ||
+        layer.mediaType === "application/vnd.oci.image.layer.v1.tar+gzip"
+    )
+  ) {
+    throw new Error("Unsupported layer");
+  }
+  console.debug(manifest);
+  const layers = await Promise.all(
+    manifest.layers.map(async (layer) => {
+      const path = join(tmp, layer.digest);
+      await downloadBlob(image, layer.digest, path);
+      return { layer, path };
+    })
+  );
+  const squashfs = `${image.replaceAll("/", "%")}.squashfs`;
+  await rm(squashfs, { force: true });
+  await tar2squashfs(
+    layers.map(async ({ path }) => {
+      const f = await open(path);
+      return f.createReadStream();
+    }),
+    squashfs
+  );
+  await downloadBlob(
+    image,
+    manifest.config.digest,
+    `${image.replaceAll("/", "%")}.config.json`
+  );
+  process.exit(1);
+} finally {
+  await rm(tmp, { recursive: true });
+}
+
+async function _getToken(registryUrl: string): Promise<RegistrySecret> {
+  const res = await fetch(`${registryUrl}/token`);
+  const json = await res.json();
+  if (
+    !json ||
+    typeof json !== "object" ||
+    !("token" in json) ||
+    typeof json.token !== "string"
+  )
+    throw new Error("Unexpected");
+  return json.token;
+}
+
+async function call(registryName: string, path: string, init: RequestInit) {
+  const registryUrl = `https://${registryName}/v2`;
+  let tokenPromise = tokenCache.get(registryName);
+  if (!tokenPromise) {
+    tokenPromise = _getToken(registryUrl);
+    tokenCache.set(registryName, tokenPromise);
+  }
+  const token = await tokenPromise;
+  console.debug(path);
+  const res = await fetch(`${registryUrl}${path}`, {
+    ...init,
+    headers: {
+      ...init.headers,
+      Authorization: `Bearer ${token}`,
+    },
+  });
+  if (!res.ok) throw new Error(res.statusText);
+  return res;
+}
+
+type ManifestPointer = {
+  mediaType: "application/vnd.oci.image.manifest.v1+json";
+  digest: string;
+  size: number;
+  platform: {
+    architecture: "amd64" | string;
+    os: string;
+  };
+  annotations?: { [k: string]: string };
+};
+
+// https://github.com/opencontainers/image-spec/blob/v1.0.1/image-index.md
+type ManifestIndex = {
+  mediaType: "application/vnd.oci.image.index.v1+json";
+  schemaVersion: 2;
+  manifests: ManifestPointer[];
+};
+
+function getImageParts(image: string): [string, string] {
+  const parts = image.split("/");
+  const registryName = parts[0];
+  const imgPath = parts.slice(1).join("/");
+  return [registryName, imgPath];
+}
+
+async function getContainerManifest(image: string, tag: string) {
+  const index = await getManifestIndex(image, tag);
+  // badly behaved registries will return whatever they want
+  if (
+    (index.mediaType as string) === "application/vnd.oci.image.manifest.v1+json"
+  ) {
+    return index as unknown as Manifest;
+  }
+  const arch = "amd64";
+  const ptr = chooseManifest(index, arch);
+  if (!ptr)
+    throw new Error(`Image ${image}:${tag} doesn't exist for arch ${arch}`);
+  const manifest = await getManifest(image, ptr);
+  return manifest;
+}
+
+async function getManifestIndex(
+  image: string,
+  tag: string
+): Promise<ManifestIndex> {
+  const [registryName, imgPath] = getImageParts(image);
+
+  const res = await call(registryName, `/${imgPath}/manifests/${tag}`, {
+    headers: {
+      Accept: "application/vnd.oci.image.index.v1+json",
+    },
+  });
+  const json = await res.json();
+  return json as ManifestIndex;
+}
+
+function chooseManifest(list: ManifestIndex, arch: string) {
+  console.debug(list);
+  return list.manifests.find(
+    (m) => m.platform.architecture === arch && m.platform.os === "linux"
+  );
+}
+
+async function getBlob(image: string, digest: string): Promise<Response> {
+  const [registryName, imgPath] = getImageParts(image);
+  return await call(registryName, `/${imgPath}/blobs/${digest}`, {});
+}
+async function jsonBlob<T>(image: string, digest: string): Promise<T> {
+  const res = await getBlob(image, digest);
+  return (await res.json()) as T;
+}
+async function downloadBlob(
+  image: string,
+  digest: string,
+  outputPath: string
+): Promise<void> {
+  const res = await getBlob(image, digest);
+  const file = await open(outputPath, "w");
+  await res.body!.pipeTo(Writable.toWeb(file.createWriteStream()));
+  return;
+}
+
+// https://github.com/opencontainers/image-spec/blob/v1.0.1/descriptor.md#properties
+type Descriptor = {
+  digest: string;
+  size: number;
+  urls?: string[];
+  annotations?: { [k: string]: string };
+};
+
+// https://github.com/opencontainers/image-spec/blob/v1.0.1/manifest.md
+type Manifest = {
+  mediaType: "application/vnd.oci.image.manifest.v1+json";
+  config: {
+    mediaType: "application/vnd.oci.image.config.v1+json";
+  } & Descriptor;
+  layers: ({
+    mediaType:
+      | "application/vnd.oci.image.layer.v1.tar"
+      | "application/vnd.oci.image.layer.v1.tar+gzip"
+      | "application/vnd.oci.image.layer.nondistributable.v1.tar"
+      | "application/vnd.oci.image.layer.nondistributable.v1.tar+gzip";
+  } & Descriptor)[];
+};
+
+async function getManifest(image: string, ptr: ManifestPointer) {
+  return await jsonBlob<Manifest>(image, ptr.digest);
+}

js/index.js

@@ -0,0 +1,143 @@
+import { delay } from "nanodelay";
+import { nanoid } from "nanoid";
+import { ChildProcess, execFile, spawn } from "node:child_process";
+import { writeFile } from "node:fs/promises";
+import { createServer, request as _request, IncomingMessage } from "node:http";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { promisify } from "node:util";
+
+const server = createServer(listener);
+
+/**
+ * @param {import("node:http").IncomingMessage} req
+ * @param {import("node:http").ServerResponse<import("node:http").IncomingMessage>} res
+ */
+async function listener(req, res) {
+  const url = getUrl(req);
+  if (url.pathname == "/run") {
+    if (req.method == "POST") {
+      await runVm();
+    } else res.writeHead(405).end("wrong method");
+  } else res.writeHead(404).end("not found");
+}
+
+async function runVm() {
+  try {
+    await FirecrackerInstance.run();
+  } catch (err) {
+    console.error(err);
+  }
+}
+
+class FirecrackerInstance {
+  proc;
+  socketPath;
+  constructor() {
+    const vmid = nanoid();
+    this.socketPath = join(tmpdir(), `firecracker-${vmid}.sock`);
+    console.debug(this.socketPath);
+    // TODO: jailer
+    this.proc = spawn(
+      "firecracker",
+      [
+        ...["--api-sock", this.socketPath],
+        ...["--level", "Debug"],
+        ...["--log-path", "/dev/stderr"],
+        "--show-level",
+        "--show-log-origin",
+      ],
+      {
+        stdio: "inherit",
+      }
+    );
+  }
+  static async run() {
+    const self = new FirecrackerInstance();
+
+    await self.request("PUT", "/boot-source", {
+      kernel_image_path: "../vmlinux.bin",
+      boot_args: "console=ttyS0 reboot=k panic=1 pci=off",
+    });
+    await self.request("PUT", "/drives/rootfs", {
+      drive_id: "rootfs",
+      path_on_host: "../rootfs.ext4",
+      is_root_device: true,
+      is_read_only: false,
+    });
+
+    // API requests are handled asynchronously, it is important the configuration is
+    // set, before `InstanceStart`.
+    await delay(15);
+
+    await self.request("PUT", "/actions", {
+      action_type: "InstanceStart",
+    });
+  }
+
+  /**
+   * @param {string} method
+   * @param {string} path
+   * @param {object} body
+   */
+  async request(method, path, body) {
+    const jsonBody = JSON.stringify(body);
+    const { response, body: respBody } = await request(
+      {
+        method,
+        path,
+        socketPath: this.socketPath,
+        headers: {
+          "Content-Type": "application/json",
+          "Content-Length": jsonBody.length,
+        },
+      },
+      jsonBody
+    );
+    // @ts-ignore
+    if (response.statusCode > 299)
+      throw new Error(
+        `Status code: ${response.statusCode} / Body: ${respBody}`,
+        {
+          cause: `${method} ${path} ${JSON.stringify(body, null, 4)}`,
+        }
+      );
+  }
+}
+
+/**
+ * @param {import("http").IncomingMessage} req
+ */
+function getUrl(req) {
+  // prettier-ignore
+  const urlString = /** @type {string} */(req.url);
+  const url = new URL(urlString, `http://${req.headers.host}`);
+  return url;
+}
+
+/**
+ * @param {string | import("url").URL | import("http").RequestOptions} opts
+ * @param {string} [body]
+ * @returns {Promise<{ response: import("node:http").IncomingMessage, body: string }>}
+ */
+function request(opts, body) {
+  return new Promise((resolve, reject) => {
+    const req = _request(opts, (res) => {
+      let respBody = "";
+      res.on("data", (data) => {
+        respBody += data;
+      });
+      res.on("end", () => {
+        resolve({ response: res, body: respBody });
+      });
+    });
+    req.on("error", reject);
+    if (body)
+      req.write(body, (error) => {
+        if (error) reject(error);
+      });
+    req.end();
+  });
+}
+
+server.listen("8080");

js/package.json

@@ -5,7 +5,7 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "start": "esbuild --bundle index.js --platform=node --sourcemap > build.cjs && sudo env PATH=\"$PATH:$HOME/.local/bin\" node --enable-source-maps build.cjs"
+    "test": "echo \"Error: no test specified\" && exit 1"
   },
   "keywords": [],
   "author": "",
@@ -15,14 +15,12 @@
     "@types/gunzip-maybe": "^1.4.0",
     "@types/node": "^20.2.5",
     "@types/tar-stream": "^2.2.2",
-    "@types/which": "^3.0.0",
     "undici": "^5.22.1"
   },
   "dependencies": {
     "gunzip-maybe": "^1.4.2",
     "nanodelay": "^2.0.2",
     "nanoid": "^4.0.2",
-    "tar-stream": "^3.0.0",
+    "tar-stream": "^3.1.2"
-    "which": "^3.0.1"
   }
 }

js/pnpm-lock.yaml

@@ -14,12 +14,12 @@ dependencies:
   nanoid:
     specifier: ^4.0.2
     version: 4.0.2
+  tar:
+    specifier: ^6.1.15
+    version: 6.1.15
   tar-stream:
-    specifier: ^3.0.0
+    specifier: ^3.1.2
-    version: 3.0.0
+    version: 3.1.2
-  which:
-    specifier: ^3.0.1
-    version: 3.0.1
 
 devDependencies:
   '@tsconfig/node16':
@@ -31,12 +31,12 @@ devDependencies:
   '@types/node':
     specifier: ^20.2.5
     version: 20.2.5
+  '@types/tar':
+    specifier: ^6.1.5
+    version: 6.1.5
   '@types/tar-stream':
     specifier: ^2.2.2
     version: 2.2.2
-  '@types/which':
-    specifier: ^3.0.0
-    version: 3.0.0
   undici:
     specifier: ^5.22.1
     version: 5.22.1
@@ -63,33 +63,17 @@ packages:
       '@types/node': 20.2.5
     dev: true
 
-  /@types/which@3.0.0:
+  /@types/tar@6.1.5:
-    resolution: {integrity: sha512-ASCxdbsrwNfSMXALlC3Decif9rwDMu+80KGp5zI2RLRotfMsTv7fHL8W8VDp24wymzDyIFudhUeSCugrgRFfHQ==}
+    resolution: {integrity: sha512-qm2I/RlZij5RofuY7vohTpYNaYcrSQlN2MyjucQc7ZweDwaEWkdN/EeNh6e9zjK6uEm6PwjdMXkcj05BxZdX1Q==}
-    dev: true
-
-  /abort-controller@3.0.0:
-    resolution: {integrity: sha512-h8lQ8tacZYnR3vNQTgibj+tODHI5/+l06Au2Pcriv/Gmet0eaj4TwWH41sO9wnHDiQsEj19q0drzdWdeAHtweg==}
-    engines: {node: '>=6.5'}
     dependencies:
-      event-target-shim: 5.0.1
+      '@types/node': 20.2.5
-    dev: false
+      minipass: 4.2.8
+    dev: true
 
   /b4a@1.6.4:
     resolution: {integrity: sha512-fpWrvyVHEKyeEvbKZTVOeZF3VSKKWtJxFIxX/jaVPf+cLbGUSitjb49pHLqPV2BUNNZ0LcoeEGfE/YCpyDYHIw==}
     dev: false
 
-  /base64-js@1.5.1:
-    resolution: {integrity: sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==}
-    dev: false
-
-  /bl@6.0.2:
-    resolution: {integrity: sha512-/ivXMGCGDI0EB4JI4zCqppp79j03vUgZz/zakw7TworE2NVjIuPxpL1Ti0InSsarKqFG5NLFreCBcCCSjtrTQw==}
-    dependencies:
-      buffer: 6.0.3
-      inherits: 2.0.4
-      readable-stream: 4.4.0
-    dev: false
-
   /browserify-zlib@0.1.4:
     resolution: {integrity: sha512-19OEpq7vWgsH6WkvkBJQDFvJS1uPcbFOQ4v9CU839dO+ZZXUZO6XpE6hNCqvlIIj+4fZvRiJ6DsAQ382GwiyTQ==}
     dependencies:
@@ -100,13 +84,6 @@ packages:
     resolution: {integrity: sha512-E+XQCRwSbaaiChtv6k6Dwgc+bx+Bs6vuKJHHl5kox/BaKbhiXzqQOwK4cO22yElGp2OCmjwVhT3HmxgyPGnJfQ==}
     dev: false
 
-  /buffer@6.0.3:
-    resolution: {integrity: sha512-FTiCpNxtwiZZHEZbcbTIcZjERVICn9yq/pDFkTl95/AxzD1naBctN7YO68riM/gLSDY7sdrMby8hofADYuuqOA==}
-    dependencies:
-      base64-js: 1.5.1
-      ieee754: 1.2.1
-    dev: false
-
   /busboy@1.6.0:
     resolution: {integrity: sha512-8SFQbg/0hQ9xy3UNTB0YEnsNBbWfhf7RtnzpL7TkBiTBRfrQ9Fxcnz7VJsleJpyp6rVLvXiuORqjlHi5q+PYuA==}
     engines: {node: '>=10.16.0'}
@@ -114,6 +91,11 @@ packages:
       streamsearch: 1.1.0
     dev: true
 
+  /chownr@2.0.0:
+    resolution: {integrity: sha512-bIomtDF5KGpdogkLd9VspvFzk9KfpyyGlS8YFVZl7TGPBHL5snIOnxeshwVgPteQ9b4Eydl+pVbIyE1DcvCWgQ==}
+    engines: {node: '>=10'}
+    dev: false
+
   /core-util-is@1.0.3:
     resolution: {integrity: sha512-ZQBvi1DcpJ4GDqanjucZ2Hj3wEO5pZDS89BWbkcrvdxksJorwUDDZamX9ldFkp9aw2lmBDLgkObEA4DWNJ9FYQ==}
     dev: false
@@ -133,20 +115,17 @@ packages:
       once: 1.4.0
     dev: false
 
-  /event-target-shim@5.0.1:
-    resolution: {integrity: sha512-i/2XbnSz/uxRCU6+NdVJgKWDTM427+MqYbkQzD321DuCQJUqOuJKIA0IM2+W2xtYHdKOmZ4dR6fExsd4SXL+WQ==}
-    engines: {node: '>=6'}
-    dev: false
-
-  /events@3.3.0:
-    resolution: {integrity: sha512-mQw+2fkQbALzQ7V0MY0IqdnXNOeTtP4r0lN9z7AAawCXgqea7bDii20AYrIBrFd/Hx0M2Ocz6S111CaFkUcb0Q==}
-    engines: {node: '>=0.8.x'}
-    dev: false
-
   /fast-fifo@1.2.0:
     resolution: {integrity: sha512-NcvQXt7Cky1cNau15FWy64IjuO8X0JijhTBBrJj1YlxlDfRkJXNaK9RFUjwpfDPzMdv7wB38jr53l9tkNLxnWg==}
     dev: false
 
+  /fs-minipass@2.1.0:
+    resolution: {integrity: sha512-V/JgOLFCS+R6Vcq0slCuaeWEdNC3ouDlJMNIsacH2VtALiu9mV4LPrHc5cDl8k5aw6J8jwgWWpiTo5RYhmIzvg==}
+    engines: {node: '>= 8'}
+    dependencies:
+      minipass: 3.3.6
+    dev: false
+
   /gunzip-maybe@1.4.2:
     resolution: {integrity: sha512-4haO1M4mLO91PW57BMsDFf75UmwoRX0GkdD+Faw+Lr+r/OZrOCS0pIBwOL1xCKQqnQzbNFGgK2V2CpBUPeFNTw==}
     hasBin: true
@@ -159,10 +138,6 @@ packages:
       through2: 2.0.5
     dev: false
 
-  /ieee754@1.2.1:
-    resolution: {integrity: sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA==}
-    dev: false
-
   /inherits@2.0.4:
     resolution: {integrity: sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==}
     dev: false
@@ -180,8 +155,35 @@ packages:
     resolution: {integrity: sha512-VLghIWNM6ELQzo7zwmcg0NmTVyWKYjvIeM83yjp0wRDTmUnrM678fQbcKBo6n2CJEF0szoG//ytg+TKla89ALQ==}
     dev: false
 
-  /isexe@2.0.0:
+  /minipass@3.3.6:
-    resolution: {integrity: sha512-RHxMLp9lnKHGHRng9QFhRCMbYAcVpn69smSGcq3f36xjgVVWThj4qqLbTLlq7Ssj8B+fIQ1EuCEGI2lKsyQeIw==}
+    resolution: {integrity: sha512-DxiNidxSEK+tHG6zOIklvNOwm3hvCrbUrdtzY74U6HKTJxvIDfOUL5W5P2Ghd3DTkhhKPYGqeNUIh5qcM4YBfw==}
+    engines: {node: '>=8'}
+    dependencies:
+      yallist: 4.0.0
+    dev: false
+
+  /minipass@4.2.8:
+    resolution: {integrity: sha512-fNzuVyifolSLFL4NzpF+wEF4qrgqaaKX0haXPQEdQ7NKAN+WecoKMHV09YcuL/DHxrUsYQOK3MiuDf7Ip2OXfQ==}
+    engines: {node: '>=8'}
+    dev: true
+
+  /minipass@5.0.0:
+    resolution: {integrity: sha512-3FnjYuehv9k6ovOEbyOswadCDPX1piCfhV8ncmYtHOjuPwylVWsghTLo7rabjC3Rx5xD4HDx8Wm1xnMF7S5qFQ==}
+    engines: {node: '>=8'}
+    dev: false
+
+  /minizlib@2.1.2:
+    resolution: {integrity: sha512-bAxsR8BVfj60DWXHE3u30oHzfl4G7khkSuPW+qvpd7jFRHm7dLxOjUk1EHACJ/hxLY8phGJ0YhYHZo7jil7Qdg==}
+    engines: {node: '>= 8'}
+    dependencies:
+      minipass: 3.3.6
+      yallist: 4.0.0
+    dev: false
+
+  /mkdirp@1.0.4:
+    resolution: {integrity: sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw==}
+    engines: {node: '>=10'}
+    hasBin: true
     dev: false
 
   /nanodelay@2.0.2:
@@ -217,11 +219,6 @@ packages:
     resolution: {integrity: sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag==}
     dev: false
 
-  /process@0.11.10:
-    resolution: {integrity: sha512-cdGef/drWFoydD1JsMzuFf8100nZl+GT+yacc2bEced5f9Rjk4z+WtFUTBu9PhOi9j/jfmBPu0mMEY4wIdAF8A==}
-    engines: {node: '>= 0.6.0'}
-    dev: false
-
   /pump@2.0.1:
     resolution: {integrity: sha512-ruPMNRkN3MHP1cWJc9OWr+T/xDP0jhXYCLfJcBuX54hhfIBnaQmAUMfDcG4DM5UMWByBbJY69QSphm3jtDKIkA==}
     dependencies:
@@ -253,16 +250,6 @@ packages:
       util-deprecate: 1.0.2
     dev: false
 
-  /readable-stream@4.4.0:
-    resolution: {integrity: sha512-kDMOq0qLtxV9f/SQv522h8cxZBqNZXuXNyjyezmfAAuribMyVXziljpQ/uQhfE1XLg2/TLTW2DsnoE4VAi/krg==}
-    engines: {node: ^12.22.0 || ^14.17.0 || >=16.0.0}
-    dependencies:
-      abort-controller: 3.0.0
-      buffer: 6.0.3
-      events: 3.3.0
-      process: 0.11.10
-    dev: false
-
   /safe-buffer@5.1.2:
     resolution: {integrity: sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==}
     dev: false
@@ -289,14 +276,25 @@ packages:
       safe-buffer: 5.1.2
     dev: false
 
-  /tar-stream@3.0.0:
+  /tar-stream@3.1.2:
-    resolution: {integrity: sha512-O6OfUKBbQOqAhh6owTWmA730J/yZCYcpmZ1DBj2YX51ZQrt7d7NgzrR+CnO9wP6nt/viWZW2XeXLavX3/ZEbEg==}
+    resolution: {integrity: sha512-rEZHMKQop/sTykFtONCcOxyyLA+9hriHJlECxfh4z+Nfew87XGprDLp9RYFCd7yU+z3ePXfHlPbZrzgSLvc16A==}
     dependencies:
       b4a: 1.6.4
-      bl: 6.0.2
       streamx: 2.15.0
     dev: false
 
+  /tar@6.1.15:
+    resolution: {integrity: sha512-/zKt9UyngnxIT/EAGYuxaMYgOIJiP81ab9ZfkILq4oNLPFX50qyYmu7jRj9qeXoxmJHjGlbH0+cm2uy1WCs10A==}
+    engines: {node: '>=10'}
+    dependencies:
+      chownr: 2.0.0
+      fs-minipass: 2.1.0
+      minipass: 5.0.0
+      minizlib: 2.1.2
+      mkdirp: 1.0.4
+      yallist: 4.0.0
+    dev: false
+
   /through2@2.0.5:
     resolution: {integrity: sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==}
     dependencies:
@@ -315,14 +313,6 @@ packages:
     resolution: {integrity: sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==}
     dev: false
 
-  /which@3.0.1:
-    resolution: {integrity: sha512-XA1b62dzQzLfaEOSQFTCOd5KFf/1VSzZo7/7TUjnya6u0vGGKzU96UQBZTAThCb2j4/xjBAyii1OhRLJEivHvg==}
-    engines: {node: ^14.17.0 || ^16.13.0 || >=18.0.0}
-    hasBin: true
-    dependencies:
-      isexe: 2.0.0
-    dev: false
-
   /wrappy@1.0.2:
     resolution: {integrity: sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==}
     dev: false
@@ -331,3 +321,7 @@ packages:
     resolution: {integrity: sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==}
     engines: {node: '>=0.4'}
     dev: false
+
+  /yallist@4.0.0:
+    resolution: {integrity: sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==}
+    dev: false

js/tar2squashfs.js

@@ -2,13 +2,10 @@
 // TODO: sandboxear mkquashfs
 // TODO: fijarse como hace firecracker-containerd
 // TODO: fijarse como hace [ignite](https://github.com/weaveworks/ignite)
-// TODO: fijarse como hace [thi](https://github.com/thi-startup/init)
-// TODO: fijarse como hace [firebuild](https://combust-labs.github.io/firebuild-docs/)
 
 import gunzip from "gunzip-maybe";
 import { spawn } from "node:child_process";
-import { Duplex, Writable } from "node:stream";
+import { Readable } from "node:stream";
-import { ReadableStream } from "node:stream/web";
 import { extract, pack } from "tar-stream";
 
 /**
@@ -26,11 +23,10 @@ import { extract, pack } from "tar-stream";
  * squashfs image that can be mounted inside the VM. This way, we reuse downloaded images
  * efficiently.
  *
- * @param {Promise<ReadableStream>[]} streams
+ * @param streams {Promise<Readable>[]}
- * @param {string} output
+ * @param output {string}
- * @param {{ content: string, headers: import("tar-stream").Headers }[]} extraFiles
  */
-export async function tar2squashfs(streams, output, extraFiles) {
+export async function tar2squashfs(streams, output) {
   const child = spawn(
     "mksquashfs",
     [
@@ -41,18 +37,14 @@ export async function tar2squashfs(streams, output, extraFiles) {
       ...["-Xcompression-level", "3"],
     ],
     {
-      // stdio: "pipe",
       stdio: ["pipe", "inherit", "inherit"],
     }
   );
 
   const p = pack();
   p.pipe(child.stdin);
-  p.on("error", console.error);
 
-  // We reverse the arrays because mksquashfs ignores files if they already exist,
+  for (const streamP of streams) {
-  // so we leave the last layers first so they are the ones used instead of the last ones
-  for (const streamP of [...streams].reverse()) {
     const stream = await streamP;
     const ex = extract();
 
@@ -60,7 +52,7 @@ export async function tar2squashfs(streams, output, extraFiles) {
       stream.pipe(p.entry(header, next));
     });
 
-    stream.pipeThrough(Duplex.toWeb(gunzip())).pipeTo(Writable.toWeb(ex));
+    stream.pipe(gunzip()).pipe(ex);
 
     await new Promise((resolve) =>
       ex.on("finish", () => {
@@ -68,11 +60,7 @@ export async function tar2squashfs(streams, output, extraFiles) {
       })
     );
   }
-
+  console.debug("finalizing");
-  for (const { headers, content } of extraFiles) {
-    p.entry(headers, content);
-  }
-
   p.finalize();
 
   await new Promise((resolve, reject) =>

js/tsconfig.json

@@ -3,6 +3,9 @@
   "compilerOptions": {
     "allowJs": true,
     "checkJs": true,
+    "lib": ["es2023"],
+    "module": "Node16",
+    "target": "es2022",
     "noEmit": true
   }
 }

main.go

@@ -0,0 +1,203 @@
+package main
+
+// https://stanislas.blog/2021/08/firecracker/
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/firecracker-microvm/firecracker-go-sdk"
+	"github.com/firecracker-microvm/firecracker-go-sdk/client/models"
+	"github.com/jaevor/go-nanoid"
+	"github.com/labstack/echo/v4"
+	"github.com/labstack/echo/v4/middleware"
+)
+
+func main() {
+	e := echo.New()
+	e.Use(middleware.Logger())
+	e.Use(middleware.Recover())
+	e.POST("/run", run)
+
+	e.Logger.Fatal(e.Start(":8080"))
+}
+
+type runResp struct {
+	VmId string
+}
+
+func run(c echo.Context) error {
+	script, err := ioutil.ReadAll(c.Request().Body)
+	if err != nil {
+		panic(err)
+	}
+
+	vmid, agent, m := startVM()
+	err = agent.run(script)
+	if err != nil {
+		return err
+	}
+
+	go func() {
+		ctx := context.Background()
+		if err := m.Wait(ctx); err != nil {
+			panic(err)
+		}
+	}()
+	defer agent.off()
+
+	return c.JSON(http.StatusOK, runResp{
+		VmId: vmid,
+	})
+}
+
+func startVM() (string, agentConfig, *firecracker.Machine) {
+	nanid, err := nanoid.Standard(21)
+	if err != nil {
+		panic(err)
+	}
+	vmid := nanid()
+	secret := nanid()
+	socketPath := "/tmp/firecracker-" + vmid + ".sock"
+
+	cfg := firecracker.Config{
+		SocketPath:      socketPath,
+		KernelImagePath: "vmlinux.bin",
+		Drives:          firecracker.NewDrivesBuilder("./rootfs.ext4").Build(),
+		NetworkInterfaces: []firecracker.NetworkInterface{{
+			CNIConfiguration: &firecracker.CNIConfiguration{
+				NetworkName: "fcnet",
+				IfName:      "veth0-fire",
+				BinPath:     []string{"/opt/cni/bin", "/usr/libexec/cni"},
+			},
+		}},
+		MachineCfg: models.MachineConfiguration{
+			VcpuCount:  firecracker.Int64(1),
+			MemSizeMib: firecracker.Int64(1024),
+		},
+		// TODO: setup jailer
+		KernelArgs: "console=ttyS0 reboot=k panic=1 pci=off fireactions.secret=" + secret,
+	}
+
+	// TODO: change stdout/stderr files
+	stdoutPath := "/tmp/stdout.log"
+	stdout, err := os.OpenFile(stdoutPath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
+	if err != nil {
+		panic(fmt.Errorf("failed to create stdout file: %v", err))
+	}
+	stderrPath := "/tmp/stderr.log"
+	stderr, err := os.OpenFile(stderrPath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
+	if err != nil {
+		panic(fmt.Errorf("failed to create stderr file: %v", err))
+	}
+
+	ctx := context.Background()
+	// build our custom command that contains our two files to
+	// write to during process execution
+	cmd := firecracker.VMCommandBuilder{}.
+		WithBin("firecracker").
+		WithSocketPath(socketPath).
+		WithStdout(stdout).
+		WithStderr(stderr).
+		Build(ctx)
+
+	m, err := firecracker.NewMachine(ctx, cfg, firecracker.WithProcessRunner(cmd))
+	if err != nil {
+		panic(fmt.Errorf("failed to create new machine: %v", err))
+	}
+
+	if err := m.Start(ctx); err != nil {
+		panic(fmt.Errorf("failed to initialize machine: %v", err))
+	}
+
+	ip := m.Cfg.NetworkInterfaces[0].StaticConfiguration.IPConfiguration.IPAddr.IP
+	log.Printf("IP: %s", ip.String())
+
+	// defer m.StopVMM()
+
+	agent := agentConfig{ip: ip.String(), secret: secret}
+
+	if err := agent.waitForAgent(); err != nil {
+		log.Panic(err)
+	}
+
+	go func() {
+		ctx := context.Background()
+		if err := m.Wait(ctx); err != nil {
+			panic(err)
+		}
+		os.Remove(cfg.SocketPath)
+	}()
+	// if err := m.Wait(ctx); err != nil {
+	// 	panic(err)
+	// }
+
+	return vmid, agent, m
+}
+
+type agentConfig struct {
+	ip     string
+	secret string
+}
+
+func (a agentConfig) request() *http.Request {
+	req, err := http.NewRequest("GET", "http://"+a.ip+":8080/hello", nil)
+	req.Header.Set("Authorization", "Bearer "+a.secret)
+	if err != nil {
+		panic(err)
+	}
+	return req
+}
+
+func (a agentConfig) run(script []byte) error {
+	req, err := http.NewRequest("POST", "http://"+a.ip+":8080/run", bytes.NewBuffer(script))
+	req.Header.Set("Authorization", "Bearer "+a.secret)
+	if err != nil {
+		panic(err)
+	}
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	byt, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		return err
+	}
+	log.Println("[QIOdLqxLoKIMQ0uGoxNuu]", string(byt))
+
+	return nil
+}
+
+func (a agentConfig) off() error {
+	return a.run([]byte("#!/bin/sh\nreboot"))
+}
+
+func (a agentConfig) waitForAgent() error {
+	client := http.Client{
+		Timeout: time.Millisecond * 50,
+	}
+	for {
+		log.Println("waiting for agent to come up...")
+		req := a.request()
+		req.Method = "GET"
+		req.URL.Path = "/hello"
+		resp, err := client.Do(req)
+		if err != nil {
+			time.Sleep(time.Millisecond * 200)
+			continue
+		}
+		if resp.StatusCode != http.StatusOK {
+			log.Println("Agent is failing", resp)
+			return errors.New("Agent is failing")
+		}
+		break
+	}
+	return nil
+}

readme.md

@@ -1,29 +1,18 @@
-# fireactions
-
-¡WIP!
-
-una API para correr cosas aisladas en una VM [firecracker] que inicia rápido a partir de una imágen de contenedor OCI. inspirado en [Fly Machines] y otras cosas.
-
-[notas y referencias sobre firecracker](https://nulo.ar/Firecracker.html) en mi sitio
-
-[firecracker]: <https://github.com/firecracker-microvm/firecracker>
-[Fly Machines]: <https://fly.io/docs/reference/machines/>
-
 ## setup
 
+```sh
+sudo env GOBIN=/opt/cni/bin go install github.com/awslabs/tc-redirect-tap/cmd/tc-redirect-tap@latest
+sudo dnf install containernetworking-plugins
+```
+
 ```sh
 # build rootfs image (incl. agent)
 (cd rootfs; pnpm install)
 node rootfs/index.js
-# run daemon
+# build & run daemon
-(cd server; pnpm install && pnpm start) &
+go build && sudo ./fireactions
 # run VM
-curl "localhost:8080/run?image=gitea.nulo.in/nulo/super-image:3.18"
+curl --data-raw "#!/bin/sh"\n"echo hi" localhost:8080/run
+# inspect VM tty
+tail -f /tmp/std*
 ```
-
-## componentes
-
-1. `server` es el servidor de api (JavaScript/TypeScript) que recibe pedidos, descarga imagenes OCI y inicia firecracker con los parametros apropiados.
-1. `rootfs` es el código (JavaScript/TypeScript) que genera el rootfs con todo lo necesario para configurar la vm (red (WIP), mounts básicos, etc) y montar la imágen.
-   1. `rootfs/init` es un programa (Rust) que hace las cosas básicas antes de y para montar la imágen OCI y hace chroot.
-

rootfs/build.js

@@ -1,15 +1,13 @@
-// @ts-check
 import { init } from "@nulo/apkit";
 import { execFile as _execFile } from "node:child_process";
 import {
   chmod,
-  copyFile,
-  lstat,
   mkdir,
   mkdtemp,
   readFile,
   readdir,
   rm,
+  symlink,
   writeFile,
 } from "node:fs/promises";
 import { tmpdir } from "node:os";
@@ -19,70 +17,73 @@ const execFile = promisify(_execFile);
 
 const root = await mkdtemp(join(tmpdir(), "fireactions-rootfs."));
 const alpine = await init(root);
-await alpine.install(["util-linux", "dhcpcd", "eudev"]);
+await alpine.install(["dropbear", "util-linux", "dropbear-dbclient", "dhcpcd"]);
 
-const initPath = await buildInit();
+// gotta go fast
-await copyFile(initPath, r("/sbin/fireactions-init"));
+await append(r("/etc/rc.conf"), 'rc_parallel="YES"');
 
-await writeSbin(
+await mkdirp(r("/usr/local/sbin"));
-  r("/sbin/init"),
+console.debug(
-  `#!/bin/sh
+  await execFile("go", [
-/etc/init-files/00-pseudofs.sh
+    "build",
-/etc/init-files/05-misc.sh
+    "-tags=netgo",
-
+    "-o",
-#exec /sbin/fireactions-init
+    r("/usr/local/sbin/fireactions-agent"),
-/sbin/fireactions-init || sh
+    "./agent",
+  ])
+);
+// https://github.com/OpenRC/openrc/blob/master/service-script-guide.md
+await writeFile(
+  r("/etc/init.d/fireactions-agent"),
+  `#!/sbin/openrc-run
+pidfile="/run/\${RC_SVCNAME}.pid"
+command_background=true
+command=/usr/local/sbin/fireactions-agent
+output_log=/dev/stdout
+error_log=/dev/stdout
 `
 );
+await chmod(r("/etc/init.d/fireactions-agent"), 0o700);
+await alpine.rcUpdate("default", "fireactions-agent");
 
-await mkdir(r("/etc/init-files/"));
+await alpine.rcUpdate("boot", "devfs");
-await writeSbin(
+await alpine.rcUpdate("boot", "procfs");
-  r("/etc/init-files/00-pseudofs.sh"),
+await alpine.rcUpdate("boot", "sysfs");
-  `#!/bin/sh
+// alpine.rcUpdate('default', 'dhcpcd')
-mountpoint -q /proc || mount -o nosuid,noexec,nodev -t proc proc /proc
+await alpine.rcUpdate("default", "dropbear");
-mountpoint -q /sys || mount -o nosuid,noexec,nodev -t sysfs sys /sys
+
-mountpoint -q /run || mount -o mode=0755,nosuid,nodev -t tmpfs run /run
+await writeFile(r("/etc/securetty"), "ttyS0");
-mountpoint -q /dev || mount -o mode=0755,nosuid -t devtmpfs dev /dev
+await symlink("agetty", r("/etc/init.d/agetty.ttyS0"));
-mkdir -p -m0755 /run/runit /run/lvm /run/user /run/lock /run/log /dev/pts /dev/shm
+await alpine.rcUpdate("default", "agetty.ttyS0");
-mountpoint -q /dev/pts || mount -o mode=0620,gid=5,nosuid,noexec -n -t devpts devpts /dev/pts
+
-mountpoint -q /dev/shm || mount -o mode=1777,nosuid,nodev -n -t tmpfs shm /dev/shm
+await mkdirp(r("/etc/dropbear"));
-mountpoint -q /sys/kernel/security || mount -n -t securityfs securityfs /sys/kernel/security
+for (const t of ["rsa", "dss", "ed25519", "ecdsa"]) {
-`
+  await execFile("dropbearkey", [
+    "-t",
+    t,
+    "-f",
+    r(`/etc/dropbear/dropbear_${t}_host_key`),
+  ]);
+}
+
+await execFile("sudo", ["mkdir", "-p", r("/root/.ssh")]);
+await writeFile(
+  "authorized_keys",
+  "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEhrcTPMrhrOdwpgFkRFjTt8rdxt3gg16LJvBCZENRWa user@personal"
+);
+await execFile("sudo", [
+  "mv",
+  "authorized_keys",
+  r("/root/.ssh/authorized_keys"),
+]);
+
+await alpine.rcUpdate("default", "networking");
+await writeFile(
+  r("/etc/network/interfaces"),
+  `auto lo
+iface lo inet loopback`
 );
 
-await writeSbin(
-  r("/etc/init-files/05-misc.sh"),
-  `#!/bin/sh
-  install -m0664 -o root -g utmp /dev/null /run/utmp
-#halt -B  # for wtmp
-
-ip link set up dev lo
-hostname -F /etc/hostname
-`
-);
-
-// await mkdirp(r("/etc/dropbear"));
-// for (const t of ["rsa", "dss", "ed25519", "ecdsa"]) {
-//   await execFile("dropbearkey", [
-//     "-t",
-//     t,
-//     "-f",
-//     r(`/etc/dropbear/dropbear_${t}_host_key`),
-//   ]);
-// }
-
-// await execFile("sudo", ["mkdir", "-p", r("/root/.ssh")]);
-// await writeFile(
-//   "authorized_keys",
-//   "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEhrcTPMrhrOdwpgFkRFjTt8rdxt3gg16LJvBCZENRWa user@personal"
-// );
-// await execFile("sudo", [
-//   "mv",
-//   "authorized_keys",
-//   r("/root/.ssh/authorized_keys"),
-// ]);
-
-// TODO: hacer squashfs
 const ext4 = "rootfs.ext4";
 await rm(ext4);
 await execFile("fallocate", ["--length", "1G", ext4]);
@@ -128,27 +129,3 @@ async function mkdirp(path) {
 function r(path) {
   return join(root, path);
 }
-
-/**
- * @param {import("fs").PathLike} path
- * @param {string} content
- */
-async function writeSbin(path, content) {
-  try {
-    await lstat(path);
-    await rm(path, { recursive: true });
-  } catch {}
-  await writeFile(path, content);
-  await chmod(path, 0o500);
-}
-
-async function buildInit() {
-  const srcPath = "./rootfs/init";
-  await execFile("podman", [
-    ...["run", "--rm", "-it"],
-    ...["-v", `${srcPath}:/home/rust/src:Z`],
-    "docker.io/messense/rust-musl-cross:x86_64-musl",
-    ...["cargo", "build", "--release"],
-  ]);
-  return join(srcPath, "target/x86_64-unknown-linux-musl/release/init");
-}

rootfs/init/.gitignore

@@ -1 +0,0 @@
-target/

rootfs/init/Cargo.lock

@@ -1,565 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
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-
-[[package]]
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-
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- "futures-util",
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- "log",
- "netlink-packet-core",
- "netlink-packet-route",
- "netlink-packet-utils",
- "netlink-proto",
- "netlink-sys",
- "nix 0.26.2",
- "thiserror",
- "tokio",
-]
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- "libc",
- "mio",
- "num_cpus",
- "pin-project-lite",
- "socket2",
- "tokio-macros",
- "windows-sys",
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- "winapi-x86_64-pc-windows-gnu",
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- "windows_x86_64_gnu",
- "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
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rootfs/init/Cargo.toml

@@ -1,15 +0,0 @@
-[package]
-name = "init"
-version = "0.1.0"
-edition = "2021"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[dependencies]
-serde = { version = "1.0.164", features = ["derive"] }
-serde_json = "1.0.97"
-nix = "0.19"
-rtnetlink = { version = "0.12.0" }
-tokio = { version = "1.0", features = ["macros", "rt", "rt-multi-thread"] }
-futures = "0.3.28"
-

rootfs/init/src/main.rs

@@ -1,210 +0,0 @@
-use futures::TryStreamExt;
-use nix::mount::MsFlags;
-use serde::{Deserialize, Serialize};
-use std::fs;
-use std::net::Ipv4Addr;
-use std::{env, io, io::Write, iter::Iterator, os::unix, path::Path, process};
-// inspirado en https://github.com/superfly/init-snapshot/blob/public/src/bin/init/main.rs#L230
-
-#[derive(Serialize, Deserialize, Debug)]
-#[serde(rename_all = "PascalCase")]
-struct Config {
-    env: Vec<String>,
-    cmd: Option<Vec<String>>,
-    entrypoint: Option<Vec<String>>,
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-struct ImageConfig {
-    architecture: String,
-    config: Config,
-}
-
-#[tokio::main]
-async fn main() -> Result<(), io::Error> {
-    let new_root = mount_new_root()?;
-    // TODO: move to after chroot after we start mounting /proc (uses /proc/cmdline)
-    setup_net_interface()
-        .await
-        .expect("couldn't set up network interace");
-    let config_file = Path::new(&new_root).join(".fireactions-image-config.json");
-    let config_text = fs::read(config_file)?;
-    let config: ImageConfig = serde_json::from_slice(&config_text).unwrap();
-    println!("{:#?}", config);
-
-    unix::fs::chroot(new_root)?;
-    env::set_current_dir("/")?;
-
-    // https://github.com/opencontainers/image-spec/blob/b5ec432b1c946c09e1568b18ef70b654a93739f6/conversion.md#verbatim-fields
-    let args = match (config.config.cmd, config.config.entrypoint) {
-        (None, Some(args)) => args,
-        (Some(args), None) => args,
-        (None, None) => panic!("Invalid config"),
-        (Some(cmd), Some(entrypoint)) => {
-            let mut args = entrypoint.clone();
-            args.append(&mut cmd.clone());
-            args
-        }
-    };
-
-    // TODO: setup hostname
-    // TODO: setup /etc/hosts
-    populate_resolvconf()?;
-
-    let mut child = process::Command::new(&args[0])
-        .args(&args[1..])
-        .env_clear()
-        .envs(config.config.env.iter().map(|s| s.split_once('=').unwrap()))
-        .spawn()?;
-    let status = child.wait()?;
-    if !status.success() {
-        println!("{}", status);
-    }
-    nix::sys::reboot::reboot(nix::sys::reboot::RebootMode::RB_AUTOBOOT)
-        .map(|_| {})
-        .unwrap();
-    Ok(())
-}
-
-// async fn get_link(handle: &rtnetlink::Handle, name: &'static str) -> _ {
-//     handle
-//         .link()
-//         .get()
-//         .match_name(name.to_string())
-//         .execute()
-//         .try_next()
-//         .await
-//         .expect("no lo link found")
-// }
-
-async fn setup_net_interface() -> Result<(), rtnetlink::Error> {
-    let (connection, handle, _) = rtnetlink::new_connection().unwrap();
-    tokio::spawn(connection);
-
-    println!("netlink: getting lo link");
-    let lo = handle
-        .link()
-        .get()
-        .match_name("lo".to_string())
-        .execute()
-        .try_next()
-        .await?
-        .expect("no lo link found");
-
-    println!("netlink: setting lo link \"up\"");
-    handle.link().set(lo.header.index).up().execute().await?;
-
-    let cmdline = fs::read("/proc/cmdline").expect("couldn't read /proc/cmdline");
-    let (guest_addr, host_addr) = cmdline
-        .split(|c| *c == b' ')
-        .map(|keyval| std::str::from_utf8(keyval).unwrap().split_once("="))
-        .filter_map(|o| o)
-        .find(|(key, _)| *key == "fireactions_ip")
-        .expect("didn't find fireactions_ip cmdline")
-        .1
-        .split_once(":")
-        .unwrap();
-
-    println!("netlink: getting eth0 link");
-    let eth0 = handle
-        .link()
-        .get()
-        .match_name("eth0".to_string())
-        .execute()
-        .try_next()
-        .await?
-        .expect("no eth0 link found");
-
-    println!("netlink: setting eth0 link \"up\"");
-    handle
-        .link()
-        .set(eth0.header.index)
-        .up()
-        .mtu(1420)
-        .execute()
-        .await?;
-
-    // XXX: la impl en init-snapshot es sketchy. pareciera que lo único que hace
-    // es desactivar el chequeo de checksum de paquetes, osea una mejora de perf.
-    // let _ = ethtool_set("eth0", ETHTOOL_SRXCSUM, 0);
-    // ethtool_set("eth0", ETHTOOL_STXCSUM, 0)?;
-
-    println!("netlink: adding ip");
-    let address = handle.address();
-    address
-        .add(eth0.header.index, guest_addr.parse().unwrap(), 24)
-        .execute()
-        .await?;
-
-    println!("netlink: adding route");
-    let route = handle.route();
-    route
-        .add()
-        .v4()
-        .gateway(host_addr.parse().unwrap())
-        .execute()
-        .await?;
-    // TODO: ipv6
-
-    Ok(())
-}
-
-fn populate_resolvconf() -> Result<(), io::Error> {
-    let mut file = fs::OpenOptions::new()
-        .create(true)
-        .write(true)
-        .truncate(true)
-        .open("/etc/resolv.conf")?;
-    // XXX: usar otro DNS?
-    write!(&mut file, "nameserver\t{}\n", "1.1.1.1")
-}
-
-fn mount_new_root() -> Result<&'static str, io::Error> {
-    // process::Command::new("modprobe")
-    //     .args(&["overlay"])
-    //     .spawn()?
-    //     .wait()?;
-
-    let image_root = "/image_src";
-    fs::create_dir_all(image_root)?;
-    nix::mount::mount::<_, _, _, [u8]>(
-        Some("/dev/vdb"),
-        image_root,
-        Some("squashfs"),
-        MsFlags::MS_RDONLY,
-        None,
-    )
-    .unwrap();
-
-    let tmp_rw = "/tmp_rw";
-    fs::create_dir_all(tmp_rw)?;
-    nix::mount::mount::<_, _, _, [u8]>(
-        Some("overlaytemp"),
-        tmp_rw,
-        Some("tmpfs"),
-        MsFlags::empty(),
-        None,
-    )
-    .unwrap();
-    let tmp_upper = "/tmp_rw/upper";
-    fs::create_dir_all(tmp_upper)?;
-    let tmp_work = "/tmp_rw/work";
-    fs::create_dir_all(tmp_work)?;
-
-    let new_root = "/new_root";
-    fs::create_dir_all(new_root)?;
-    let overlay_opts = format!(
-        "lowerdir={},upperdir={},workdir={}",
-        image_root, tmp_upper, tmp_work
-    );
-    nix::mount::mount::<_, _, _, [u8]>(
-        Some("overlay-root"),
-        new_root,
-        Some("overlay"),
-        MsFlags::empty(),
-        Some(overlay_opts.as_bytes()),
-    )
-    .unwrap();
-
-    Ok(new_root)
-}

server/.gitignore

@@ -1,8 +0,0 @@
-# compiled typescript
-container-baby.js
-
-# cache, will move later
-cache/
-
-# jailer
-jailer/

server/container-baby.ts

@@ -1,270 +0,0 @@
-import { execFile as _execFile } from "node:child_process";
-import { access, mkdir, open, rename, writeFile } from "node:fs/promises";
-import { join } from "node:path";
-import { tar2squashfs } from "./tar2squashfs.js";
-import { subtle } from "node:crypto";
-import { Writable } from "node:stream";
-
-type RegistryName = string;
-type RegistrySecret = string;
-const getToken = memoizeDownloader(_getToken);
-let squashfsDownloads = new Map<string, Promise<string>>();
-
-const cacheDir = "cache/";
-// {
-//   const image = "gitea.nulo.in/nulo/zulip-checkin-cyborg";
-//   const tag = "latest";
-
-//   await downloadImage(image, tag);
-// }
-
-export const CONFIG_PATH_IN_IMAGE = "/.fireactions-image-config.json";
-
-export function parseImageRef(ref: string): { image: string; tag: string } {
-  const [image, tag] = ref.split(":");
-  if (!image || !tag) throw new Error("Invalid image ref " + ref);
-  return { image, tag };
-}
-
-export async function downloadImage(image: string, tag: string) {
-  await mkdir(cacheDir, { recursive: true });
-  const manifest = await getManifest(image, tag);
-
-  // sanity check
-  if (
-    !manifest.layers.every(
-      (layer) =>
-        layer.mediaType === "application/vnd.oci.image.layer.v1.tar" ||
-        layer.mediaType === "application/vnd.oci.image.layer.v1.tar+gzip"
-    )
-  ) {
-    throw new Error("Unsupported layer");
-  }
-
-  console.debug(manifest);
-
-  const config = await jsonBlob(image, manifest.config.digest);
-  const squashfsFile = await saveSquashfs(
-    image,
-    manifest,
-    JSON.stringify(config, null, 2)
-  );
-
-  return { squashfsFile };
-}
-
-// https://stackoverflow.com/a/67600346
-async function hashData(data: string, algorithm = "SHA-512"): Promise<string> {
-  const ec = new TextEncoder();
-  const digest: ArrayBuffer = await subtle.digest(algorithm, ec.encode(data));
-  const hashArray = Array.from(new Uint8Array(digest));
-  const hash = hashArray
-    .map((item) => item.toString(16).padStart(2, "0"))
-    .join("");
-  return hash;
-}
-
-async function saveSquashfs(
-  image: string,
-  manifest: Manifest,
-  configJson: string
-): Promise<string> {
-  const manifestDigest = await hashData(JSON.stringify(manifest));
-  const key = `${image.replaceAll("/", "%")}#${manifestDigest}.squashfs`;
-
-  let p = squashfsDownloads.get(key);
-  if (!p) {
-    p = (async () => {
-      const output = join(cacheDir, key);
-      const progressFile = output + ".downloading";
-      try {
-        await access(output);
-        // ya está cacheado
-      } catch {
-        if (process.env.DEBUG_WRITE_BLOBS)
-          await Promise.all(
-            manifest.layers.map(async (layer) => {
-              const res = await getBlob(image, layer.digest);
-              const file = await open(layer.digest, "w");
-              await res.body!.pipeTo(Writable.toWeb(file.createWriteStream()));
-            })
-          );
-        const layerStreams = manifest.layers.map(async (layer) => {
-          const res = await getBlob(image, layer.digest);
-          return res.body!;
-        });
-        await tar2squashfs(layerStreams, progressFile, [
-          {
-            content: configJson,
-            headers: {
-              name: CONFIG_PATH_IN_IMAGE,
-              uid: 0,
-              gid: 0,
-              mode: 0o400,
-            },
-          },
-        ]);
-        await rename(progressFile, output);
-      }
-      return output;
-    })();
-    squashfsDownloads.set(key, p);
-  }
-
-  return p;
-}
-
-async function _getToken(registryUrl: string): Promise<RegistrySecret> {
-  const res = await fetch(`${registryUrl}/token`);
-  const json = await res.json();
-  if (
-    !json ||
-    typeof json !== "object" ||
-    !("token" in json) ||
-    typeof json.token !== "string"
-  )
-    throw new Error("Unexpected");
-  return json.token;
-}
-
-async function call(registryName: string, path: string, init: RequestInit) {
-  const registryUrl = `https://${registryName}/v2`;
-  const token = await getToken(registryUrl);
-  console.debug(path);
-  const res = await fetch(`${registryUrl}${path}`, {
-    ...init,
-    headers: {
-      ...init.headers,
-      Authorization: `Bearer ${token}`,
-    },
-  });
-  if (!res.ok) throw new Error(res.statusText);
-  return res;
-}
-
-// https://github.com/opencontainers/image-spec/blob/v1.0.1/image-index.md
-type ManifestIndex = {
-  schemaVersion: 2;
-  mediaType: "application/vnd.oci.image.index.v1+json";
-  manifests: ManifestPointer[];
-};
-type DockerManifestV2 = {
-  schemaVersion: 2;
-  mediaType: "application/vnd.docker.distribution.manifest.v2+json";
-  config: Descriptor;
-  layers: DockerManifestV2Layer[];
-};
-
-type ManifestPointer = {
-  mediaType: "application/vnd.oci.image.manifest.v1+json";
-  digest: string;
-  size: number;
-  platform: {
-    architecture: "amd64" | string;
-    os: string;
-  };
-  annotations?: { [k: string]: string };
-};
-type DockerManifestV2Layer = {
-  mediaType: "application/vnd.docker.image.rootfs.diff.tar.gzip";
-} & Descriptor;
-
-function getImageParts(image: string): [string, string] {
-  const parts = image.split("/");
-  const registryName = parts[0];
-  const imgPath = parts.slice(1).join("/");
-  return [registryName, imgPath];
-}
-
-async function getManifest(image: string, tag: string): Promise<Manifest> {
-  const [registryName, imgPath] = getImageParts(image);
-  const res = await call(registryName, `/${imgPath}/manifests/${tag}`, {
-    headers: {
-      Accept: "application/vnd.oci.image.index.v1+json",
-    },
-  });
-  const json = (await res.json()) as object;
-  if (!("mediaType" in json)) throw new Error(`Received invalid manifest`);
-
-  if (
-    json.mediaType === "application/vnd.docker.distribution.manifest.v2+json"
-  ) {
-    const manifest = json as DockerManifestV2;
-    return {
-      mediaType: "application/vnd.oci.image.manifest.v1+json",
-      config: {
-        ...manifest.config,
-        mediaType: "application/vnd.oci.image.config.v1+json",
-      },
-      layers: manifest.layers.map((l) => ({
-        ...l,
-        mediaType: "application/vnd.oci.image.layer.v1.tar+gzip",
-      })),
-    };
-  } else if (json.mediaType === "application/vnd.oci.image.manifest.v1+json") {
-    return json as Manifest;
-  } else if (json.mediaType === "application/vnd.oci.image.index.v1+json") {
-    const index = json as ManifestIndex;
-    // XXX: hardcoded amd64
-    const arch = "amd64";
-    const manifestPtr = chooseManifest(index, arch);
-    if (!manifestPtr) throw new Error(`No manifest for arch ${arch}`);
-
-    const manifest = await jsonBlob<Manifest>(image, manifestPtr.digest);
-    return manifest;
-  } else throw new Error(`Received invalid manifest`);
-}
-
-function chooseManifest(list: ManifestIndex, arch: string) {
-  console.debug(list);
-  return list.manifests.find(
-    (m) => m.platform.architecture === arch && m.platform.os === "linux"
-  );
-}
-
-async function getBlob(image: string, digest: string): Promise<Response> {
-  const [registryName, imgPath] = getImageParts(image);
-  return await call(registryName, `/${imgPath}/blobs/${digest}`, {});
-}
-async function jsonBlob<T>(image: string, digest: string): Promise<T> {
-  const res = await getBlob(image, digest);
-  return (await res.json()) as T;
-}
-
-function memoizeDownloader<T>(
-  downloader: (id: string) => Promise<T>
-): (id: string) => Promise<T> {
-  let map = new Map<string, Promise<T>>();
-
-  return (id) => {
-    let p = map.get(id);
-    if (!p) {
-      p = downloader(id);
-      map.set(id, p);
-    }
-    return p;
-  };
-}
-
-// https://github.com/opencontainers/image-spec/blob/v1.0.1/descriptor.md#properties
-type Descriptor = {
-  digest: string;
-  size: number;
-  urls?: string[];
-  annotations?: { [k: string]: string };
-};
-
-// https://github.com/opencontainers/image-spec/blob/v1.0.1/manifest.md
-type Manifest = {
-  mediaType: "application/vnd.oci.image.manifest.v1+json";
-  config: {
-    mediaType: "application/vnd.oci.image.config.v1+json";
-  } & Descriptor;
-  layers: ({
-    mediaType:
-      | "application/vnd.oci.image.layer.v1.tar"
-      | "application/vnd.oci.image.layer.v1.tar+gzip"
-      | "application/vnd.oci.image.layer.nondistributable.v1.tar"
-      | "application/vnd.oci.image.layer.nondistributable.v1.tar+gzip";
-  } & Descriptor)[];
-};

server/index.js

@@ -1,292 +0,0 @@
-import { delay } from "nanodelay";
-import { customAlphabet as nanoidCustomAlphabet, nanoid } from "nanoid";
-import which from "which";
-import { spawn, execFile as _execFile } from "node:child_process";
-import { createServer, request as _request } from "node:http";
-import { tmpdir } from "node:os";
-import { basename, join } from "node:path";
-import { downloadImage, parseImageRef } from "./container-baby.js";
-import { promisify } from "node:util";
-import { access, chmod, chown, link, mkdir } from "node:fs/promises";
-const execFile = promisify(_execFile);
-
-const server = createServer(listener);
-
-/**
- * @param {import("node:http").IncomingMessage} req
- * @param {import("node:http").ServerResponse<import("node:http").IncomingMessage>} res
- */
-async function listener(req, res) {
-  const url = getUrl(req);
-  if (url.pathname == "/run") {
-    if (req.method == "POST") {
-      const image = url.searchParams.get("image");
-      if (!image) return res.writeHead(400).end("missing image param");
-      await runVm(image);
-    } else res.writeHead(405).end("wrong method");
-  } else res.writeHead(404).end("not found");
-}
-
-/**
- * @param {string} image - ref to an OCI image
- */
-async function runVm(image) {
-  try {
-    const ref = parseImageRef(image);
-    const { squashfsFile } = await downloadImage(ref.image, ref.tag);
-    await FirecrackerInstance.run({
-      drives: [
-        {
-          drive_id: "image",
-          is_read_only: true,
-          is_root_device: false,
-          path_on_host: squashfsFile,
-        },
-      ],
-    });
-  } catch (err) {
-    console.error(err);
-  }
-}
-
-/**
- * @typedef {object} Drive
- * @prop {string} drive_id
- * @prop {string} path_on_host
- * @prop {boolean} is_root_device
- * @prop {boolean} is_read_only
- */
-
-/**
- * gets absolute path to firecracker executable
- * @returns {Promise<string>}
- */
-async function getFirecrackerExe() {
-  const firecrackerExe = await which("firecracker", { nothrow: true });
-  console.debug(
-    `[fireactions] Using firecracker executable '${firecrackerExe}'`
-  );
-  return firecrackerExe;
-}
-
-const jailerDir = "./jailer";
-const [jailerUid, jailerGid] = [65534, 65534];
-
-// we need to use a custom alphabet because jailer is picky
-const jailerNanoid = nanoidCustomAlphabet(
-  "0123456789abcdefghijklmnopqrstuvwxyz-",
-  64
-);
-
-class FirecrackerInstance {
-  vmid;
-  socketPath;
-  proc;
-  /**
-   * @param {{ firecrackerExe: string }} param0
-   * @private
-   */
-  constructor({ firecrackerExe }) {
-    this.vmid = jailerNanoid();
-    this.socketPath = join(this.chrootPath, `firecracker.sock`);
-    console.debug(this.socketPath);
-    this.proc = spawn(
-      "jailer",
-      [
-        ...["--id", this.vmid],
-        ...["--exec-file", firecrackerExe],
-        ...["--uid", "" + jailerUid],
-        ...["--gid", "" + jailerGid],
-        ...["--chroot-base-dir", jailerDir],
-        "--",
-        ...["--api-sock", "/firecracker.sock"],
-        // ...["--level", "Debug"],
-        // ...["--log-path", "/stderr.log"],
-        // "--show-level",
-        // "--show-log-origin",
-      ],
-      {
-        stdio: "inherit",
-      }
-    );
-
-    console.debug(
-      `[fireactions] Started firecracker with jailer at ${this.chrootPath}`
-    );
-  }
-
-  get chrootPath() {
-    return join(jailerDir, "firecracker", this.vmid, "root");
-  }
-
-  /**
-   * @param {string} path path to file to hardlink to root of chroot
-   * @param {number} mod mod inside the chroot
-   */
-  async hardlinkToChroot(path, mod = 0o600) {
-    const chrootPath = join(this.chrootPath, basename(path));
-    let accesed = false;
-    try {
-      await access(chrootPath);
-      accesed = true;
-    } catch {}
-    if (accesed)
-      throw new Error("file with same name already exists inside chroot");
-    await link(path, chrootPath);
-    await chown(chrootPath, jailerUid, jailerGid);
-    await chmod(chrootPath, mod);
-  }
-
-  /**
-   * @param [opts] {{ drives?: Drive[] }}
-   */
-  static async run(opts) {
-    await mkdir(jailerDir, { recursive: true });
-    const self = new FirecrackerInstance({
-      firecrackerExe: await getFirecrackerExe(),
-    });
-    await mkdir(self.chrootPath, { recursive: true });
-    // TODO: retry until success
-    await delay(15);
-
-    const { ifname, hostAddr, guestAddr } = await createNetworkInterface();
-
-    await self.hardlinkToChroot("../vmlinux.bin", 0o400);
-    await self.request("PUT", "/boot-source", {
-      kernel_image_path: "/vmlinux.bin",
-      boot_args: `console=ttyS0 reboot=k panic=1 pci=off fireactions_ip=${guestAddr}:${hostAddr}`,
-    });
-    // TODO: readonly
-    self.attachDrive({
-      drive_id: "rootfs",
-      path_on_host: "/rootfs.ext4",
-      is_root_device: true,
-      is_read_only: false,
-    });
-    if (opts?.drives) {
-      for (const drive of opts.drives) {
-        await self.attachDrive(drive);
-      }
-    }
-    await self.request("PUT", "/network-interfaces/eth0", {
-      iface_id: "eth0",
-      guest_mac: "AA:FC:00:00:00:01",
-      host_dev_name: ifname,
-    });
-
-    // API requests are handled asynchronously, it is important the configuration is
-    // set, before `InstanceStart`.
-    // TODO: avoid race condition somehow? this is the way of the firecracker quickstart guide. check firectl/go-sdk
-    await delay(15);
-
-    await self.request("PUT", "/actions", {
-      action_type: "InstanceStart",
-    });
-  }
-
-  /**
-   * @param {Drive} drive
-   */
-  async attachDrive(drive) {
-    const perms = drive.is_read_only ? 0o400 : 0o600;
-    await this.hardlinkToChroot(drive.path_on_host, perms);
-    await this.request("PUT", "/drives/" + drive.drive_id, {
-      ...drive,
-      path_on_host: "/" + basename(drive.path_on_host),
-    });
-  }
-
-  /**
-   * @param {string} method
-   * @param {string} path
-   * @param {object} body
-   */
-  async request(method, path, body) {
-    const jsonBody = JSON.stringify(body);
-    const { response, body: respBody } = await request(
-      {
-        method,
-        path,
-        socketPath: this.socketPath,
-        headers: {
-          "Content-Type": "application/json",
-          "Content-Length": jsonBody.length,
-        },
-      },
-      jsonBody
-    );
-    // @ts-ignore
-    if (response.statusCode > 299)
-      throw new Error(
-        `Status code: ${response.statusCode} / Body: ${respBody}`,
-        {
-          cause: `${method} ${path} ${JSON.stringify(body, null, 4)}`,
-        }
-      );
-  }
-}
-
-/**
- * @param {import("http").IncomingMessage} req
- */
-function getUrl(req) {
-  // prettier-ignore
-  const urlString = /** @type {string} */(req.url);
-  const url = new URL(urlString, `http://${req.headers.host}`);
-  return url;
-}
-
-/**
- * @param {string | import("url").URL | import("http").RequestOptions} opts
- * @param {string} [body]
- * @returns {Promise<{ response: import("node:http").IncomingMessage, body: string }>}
- */
-function request(opts, body) {
-  return new Promise((resolve, reject) => {
-    const req = _request(opts, (res) => {
-      let respBody = "";
-      res.on("data", (data) => {
-        respBody += data;
-      });
-      res.on("end", () => {
-        resolve({ response: res, body: respBody });
-      });
-    });
-    req.on("error", reject);
-    if (body)
-      req.write(body, (error) => {
-        if (error) reject(error);
-      });
-    req.end();
-  });
-}
-
-/**
- * @type {string[]}
- */
-let interfaces = [];
-let ifIndex = 2;
-async function createNetworkInterface() {
-  const ifname = "f" + nanoid(13);
-  await execFile("ip", ["tuntap", "add", ifname, "mode", "tap"]);
-  interfaces.push(ifname);
-
-  const hostAddr = `172.16.0.${ifIndex}`;
-  const guestAddr = `172.16.0.${ifIndex + 1}`;
-  ifIndex += 2;
-
-  await execFile("ip", ["addr", "add", `${hostAddr}/31`, "dev", ifname]);
-  await execFile("ip", ["link", "set", ifname, "up"]);
-  // TODO: setup masquerade
-
-  return { hostAddr, guestAddr, ifname };
-}
-
-process.on("beforeExit", async () => {
-  for (const ifname of interfaces) {
-    await execFile("ip", ["tuntap", "del", ifname, "mode", "tap"]);
-  }
-  process.exit(0);
-});
-
-server.listen("8080");