define-alpine-the-sequel/index.ts

import {
  execFile as execFileCallback,
  spawn as spawnCallback,
} from "node:child_process";
import { copyFile, mkdir, mkdtemp, opendir, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import path from "node:path";
import { promisify } from "node:util";
const execFile = promisify(execFileCallback);
const spawn = promisify(spawnCallback);

{
  const rootfsDir = await mkdtemp(path.join(tmpdir(), "define-alpine-"));
  console.debug(rootfsDir);
  await makeWorld(rootfsDir);
  try {
    await spawn("sudo", ["chroot", rootfsDir], { stdio: "inherit" });
  } catch {}
}

async function makeWorld(dir: string): Promise<void> {
  const apkDir = path.join(dir, "/etc/apk");
  await mkdir(apkDir, { recursive: true });

  {
    const apkKeysDir = path.join(apkDir, "keys");
    const keysSrcDir = "alpine/keys";
    await mkdir(apkKeysDir);
    for await (const { name } of await opendir(keysSrcDir))
      await copyFile(path.join(keysSrcDir, name), path.join(apkKeysDir, name));
  }

  await writeFile(
    path.join(apkDir, "repositories"),
    [
      "https://dl-cdn.alpinelinux.org/alpine/v3.17/main",
      "https://dl-cdn.alpinelinux.org/alpine/v3.17/community",
    ].join("\n")
  );
  await execFile("sudo", [
    "apk",
    "add",
    "--initdb",
    "--clean-protected",
    "--root",
    dir,
    ...["alpine-baselayout", "busybox", "libc-utils", "alpine-keys"],
  ]);
}