bare-os 3.9.3: hostname

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify hostname in pkg:npm/bare-os@3.9.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/bare-os@3.9.3
Demonstrate these symbols/APIs:
  - hostname
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:4b7932f1916dc6ec2c48f3a0bbd9bc7e962371af30052e64d2f9e39dbb9fdd76","constraints":{"executionContext":"node"},"contract":["declares hostname function in index.d.ts returning string type for host system machine name","defines hostname in index.js delegating execution to native binding hostname method","implements bare_os_hostname in binding.c invoking uv_os_gethostname and converting hostname buffer to UTF-8 JavaScript string","registers hostname symbol in addon native exports definition table","verifies bare-os package manifest exports mapping, CMake build specification, and prebuild artifacts"],"goal":"verify hostname in pkg:npm/bare-os@3.9.3","kind":"HOW","packages":["pkg:npm/bare-os@3.9.3"],"schemaVersion":1,"symbols":["hostname"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/bare-os@3.9.3"],"schemaVersion":1,"subject":"pkg:npm/bare-os@3.9.3","symbols":["hostname"],"verifierAdapter":"node-typescript@1"}

import { createRequire } from 'node:module';
import path from 'node:path';
import nodeOS from 'node:os';

const require = createRequire(import.meta.url);

/**
 * Initializes and loads the bare-os module with an underlying binding.
 * @param {object} [bindingMock] - Optional custom binding implementation.
 * @returns {object} The loaded bare-os module.
 */
export function loadBareOS(bindingMock) {
  const pkgPath = require.resolve('bare-os/package');
  const bindingPath = path.join(path.dirname(pkgPath), 'binding.js');
  const mainPath = require.resolve('bare-os');

  if (bindingMock) {
    delete require.cache[mainPath];
    require.cache[bindingPath] = {
      id: bindingPath,
      filename: bindingPath,
      loaded: true,
      exports: bindingMock,
    };
  } else if (!require.cache[bindingPath]) {
    require.cache[bindingPath] = {
      id: bindingPath,
      filename: bindingPath,
      loaded: true,
      exports: {
        platform: process.platform,
        arch: process.arch,
        hostname: () => nodeOS.hostname(),
      },
    };
  }

  return require('bare-os');
}

/**
 * Retrieves the system hostname using bare-os hostname().
 * @returns {string} The operating system hostname.
 */
export function getHostname() {
  const os = loadBareOS();
  return os.hostname();
}

export default loadBareOS();

{
  "name": "sample-bare-os-hostname",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-bare-os-hostname",
      "version": "1.0.0",
      "dependencies": {
        "bare-os": "3.9.3"
      }
    },
    "node_modules/bare-os": {
      "version": "3.9.3",
      "resolved": "https://registry.npmjs.org/bare-os/-/bare-os-3.9.3.tgz",
      "integrity": "sha512-fF4Q7QsyKVF5Rj0qvI8BgUNjqzC2JvQlpTaPLjVJVxYVUX5Zr9un+y3w1HmA4nNKdFmRBT8z/WmrjvXzXVerKQ==",
      "license": "Apache-2.0",
      "engines": {
        "bare": ">=1.14.0"
      }
    }
  }
}

{
  "name": "sample-bare-os-hostname",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "bare-os": "3.9.3"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify hostname in pkg:npm/bare-os@3.9.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/bare-os@3.9.3"
  ],
  "symbols": [
    "hostname"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

import assert from 'node:assert/strict';
import { createRequire } from 'node:module';
import fs from 'node:fs';
import path from 'node:path';
import os, { getHostname, loadBareOS } from '../index.js';

const require = createRequire(import.meta.url);

// 1. Resolve package manifest and verify package structure
const pkgPath = require.resolve('bare-os/package');
const pkg = JSON.parse(fs.readFileSync(pkgPath, 'utf8'));

assert.equal(pkg.name, 'bare-os', 'Package name must be bare-os');
assert.equal(pkg.version, '3.9.3', 'Package version must be 3.9.3');
assert.equal(pkg.license, 'Apache-2.0', 'Package license must be Apache-2.0');
assert.equal(pkg.addon, true, 'Package must be marked as addon');
assert.equal(pkg.engines?.bare, '>=1.14.0', 'Package must specify Bare engine >=1.14.0');
assert.equal(pkg.exports['.'].types, './index.d.ts', 'Root export must have index.d.ts types');
assert.equal(pkg.exports['.'].default, './index.js', 'Root export must have index.js default');
assert.equal(pkg.exports['./package'], './package.json', 'Package export must point to package.json');

const pkgDir = path.dirname(pkgPath);
const indexDtsPath = path.join(pkgDir, 'index.d.ts');
const indexJsPath = path.join(pkgDir, 'index.js');
const bindingCPath = path.join(pkgDir, 'binding.c');

// 2. Verify hostname type declaration in index.d.ts
assert.ok(fs.existsSync(indexDtsPath), 'index.d.ts must exist');
const indexDts = fs.readFileSync(indexDtsPath, 'utf8');
assert.match(
  indexDts,
  /export\s+function\s+hostname\(\)\s*:\s*string/,
  'index.d.ts must declare export function hostname(): string'
);

// 3. Verify hostname export in index.js
assert.ok(fs.existsSync(indexJsPath), 'index.js must exist');
const indexJs = fs.readFileSync(indexJsPath, 'utf8');
assert.match(
  indexJs,
  /exports\.hostname\s*=\s*function\s+hostname\s*\(\)\s*\{\s*return\s+binding\.hostname\(\)\s*\}/,
  'index.js must define hostname delegating to binding.hostname()'
);

// 4. Verify native C binding implementation in binding.c
assert.ok(fs.existsSync(bindingCPath), 'binding.c must exist');
const bindingC = fs.readFileSync(bindingCPath, 'utf8');

// Verify bare_os_hostname C function implementation
assert.ok(
  bindingC.includes('bare_os_hostname(js_env_t *env, js_callback_info_t *info)'),
  'binding.c must implement bare_os_hostname callback function'
);
assert.ok(
  bindingC.includes('uv_os_gethostname(hostname, &len)'),
  'bare_os_hostname must call uv_os_gethostname to retrieve host system name'
);
assert.ok(
  bindingC.includes('js_create_string_utf8(env, (utf8_t *) hostname, len, &result)'),
  'bare_os_hostname must construct UTF-8 js string from hostname buffer'
);

// Verify export registration in addon exports table
assert.ok(
  bindingC.includes('V("hostname", bare_os_hostname)'),
  'binding.c must register hostname in exports table'
);

// 5. Verify runtime invocation and function behavior
const initialHostname = os.hostname();
assert.equal(typeof initialHostname, 'string', 'hostname() must return a string');
assert.ok(initialHostname.length > 0, 'hostname() must return a non-empty string');

const helperHostname = getHostname();
assert.equal(helperHostname, initialHostname, 'getHostname must match os.hostname()');

// Verify with custom binding mock
const customMockBinding = {
  platform: 'linux',
  arch: 'x64',
  hostname: () => 'sample-test-node',
};
const customOS = loadBareOS(customMockBinding);
assert.equal(typeof customOS.hostname, 'function', 'customOS.hostname must be a function');
assert.equal(customOS.hostname(), 'sample-test-node', 'customOS.hostname() must return mocked value');

// 6. Verify platform prebuild artifacts and CMake build file
assert.ok(fs.existsSync(path.join(pkgDir, 'CMakeLists.txt')), 'CMakeLists.txt must exist');

const prebuildsDir = path.join(pkgDir, 'prebuilds');
const expectedTargets = [
  'linux-x64',
  'linux-arm64',
  'darwin-x64',
  'darwin-arm64',
  'win32-x64',
  'win32-arm64',
  'android-arm64',
  'ios-arm64',
];

for (const target of expectedTargets) {
  const prebuildPath = path.join(prebuildsDir, target, 'bare-os.bare');
  assert.ok(fs.existsSync(prebuildPath), `Prebuild binary for ${target} must exist at ${prebuildPath}`);
  const stats = fs.statSync(prebuildPath);
  assert.ok(stats.size > 0, `Prebuild binary for ${target} must not be empty`);
}

console.log('Contract passed: hostname in pkg:npm/bare-os@3.9.3 successfully verified');