bare-posix 1.0.1: geteuid

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 bare-posix.geteuid in pkg:npm/bare-posix@1.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/bare-posix@1.0.1
Demonstrate these symbols/APIs:
  - bare-posix.geteuid

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:a2aa3d417fb61c1bc578ea4ddc71ceb2d85ad61677cfce7140400caeb88ea4d8","contract":["declares geteuid returning number and seteuid accepting number or string in TypeScript definition index.d.ts","unsupported platform fallback implements geteuid returning -1 and seteuid throwing platform not supported error","native C binding implements bare_posix_geteuid invoking POSIX geteuid and bare_posix_seteuid invoking seteuid","module wrapper exports geteuid delegating to native binding returning effective user ID","module wrapper seteuid accepts numeric user ID and forwards directly to native binding","module wrapper seteuid resolves string username to UID via getpwnam before calling native binding"],"goal":"verify bare-posix.geteuid in pkg:npm/bare-posix@1.0.1","kind":"HOW","packages":["pkg:npm/bare-posix@1.0.1"],"schemaVersion":1,"symbols":["bare-posix.geteuid"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/bare-posix@1.0.1"],"schemaVersion":1,"subject":"pkg:npm/bare-posix@1.0.1","symbols":["bare-posix.geteuid"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-bare-posix-geteuid",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-bare-posix-geteuid",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "bare-posix": "1.0.1"
      }
    },
    "node_modules/bare-posix": {
      "version": "1.0.1",
      "resolved": "https://registry.npmjs.org/bare-posix/-/bare-posix-1.0.1.tgz",
      "integrity": "sha512-b4quA8dyRVvX0aFIAIiev5zFATHwIUGr42Gmt+CqiBNg/bdsNkrj4bbkeotMOMiljJS4DCME5kywJO/TFwKo1A==",
      "license": "Apache-2.0"
    }
  }
}

{
  "name": "sample-bare-posix-geteuid",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "bare-posix": "1.0.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify bare-posix.geteuid in pkg:npm/bare-posix@1.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/bare-posix@1.0.1"
  ],
  "symbols": [
    "bare-posix.geteuid"
  ]
}

import assert from 'node:assert/strict';
import { createRequire } from 'node:module';
import fs from 'node:fs';
import path from 'node:path';

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

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

assert.equal(pkg.name, 'bare-posix', 'Package name must be bare-posix');
assert.equal(pkg.version, '1.0.1', 'Package version must be 1.0.1');
assert.equal(pkg.addon, true, 'Package must be marked as Bare addon');

const pkgDir = path.dirname(pkgPath);

// 2. Verify TypeScript declarations for bare-posix.geteuid and bare-posix.seteuid
const indexDtsPath = path.join(pkgDir, 'index.d.ts');
assert.ok(fs.existsSync(indexDtsPath), 'index.d.ts must exist');
const indexDts = fs.readFileSync(indexDtsPath, 'utf8');

assert.ok(indexDts.includes('export function geteuid(): number'), 'index.d.ts must declare geteuid');
assert.ok(indexDts.includes('export function seteuid(id: number | string): void'), 'index.d.ts must declare seteuid');

// 3. Verify unsupported platform fallback implementation in unsupported.js
const unsupportedPath = path.join(pkgDir, 'unsupported.js');
assert.ok(fs.existsSync(unsupportedPath), 'unsupported.js must exist');
const unsupported = require(unsupportedPath);

assert.equal(typeof unsupported.geteuid, 'function', 'unsupported.geteuid must be a function');
assert.equal(unsupported.geteuid(), -1, 'unsupported.geteuid() must return -1');
assert.throws(() => unsupported.seteuid(0), /Platform not supported/, 'unsupported.seteuid must throw Platform not supported');

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

assert.ok(bindingC.includes('bare_posix_geteuid'), 'binding.c must implement bare_posix_geteuid');
assert.ok(bindingC.includes('geteuid()'), 'binding.c must call POSIX geteuid()');
assert.ok(bindingC.includes('bare_posix_seteuid'), 'binding.c must implement bare_posix_seteuid');
assert.ok(bindingC.includes('seteuid('), 'binding.c must call POSIX seteuid()');
assert.ok(bindingC.includes('BARE_MODULE(bare_posix, bare_posix_exports)'), 'binding.c must export BARE_MODULE');

// 5. Verify index.js wrapper logic with mock native binding
const bindingJsPath = path.join(pkgDir, 'binding.js');
const indexJsPath = path.join(pkgDir, 'index.js');
assert.ok(fs.existsSync(bindingJsPath), 'binding.js must exist');
assert.ok(fs.existsSync(indexJsPath), 'index.js must exist');

const mockCalls = [];
const mockBinding = {
  geteuid: () => 1000,
  seteuid: (id) => { mockCalls.push(['seteuid', id]); },
  getpwnam: (name) => {
    if (name === 'root') return { username: 'root', passwd: 'x', uid: 0, gid: 0, gecos: 'root', homedir: '/root', shell: '/bin/bash' };
    if (name === 'nobody') return { username: 'nobody', passwd: 'x', uid: 65534, gid: 65534, gecos: 'nobody', homedir: '/nonexistent', shell: '/usr/sbin/nologin' };
    return null;
  }
};

require.cache[bindingJsPath] = {
  id: bindingJsPath,
  filename: bindingJsPath,
  loaded: true,
  exports: mockBinding
};

delete require.cache[indexJsPath];
const posix = require(indexJsPath);

assert.equal(typeof posix.geteuid, 'function', 'posix.geteuid must be exported as a function');
assert.equal(posix.geteuid(), 1000, 'posix.geteuid() must delegate to binding.geteuid');

// Test seteuid with numeric ID
posix.seteuid(500);
assert.deepEqual(mockCalls[mockCalls.length - 1], ['seteuid', 500], 'posix.seteuid with numeric ID must pass integer directly to binding');

// Test seteuid with string username (delegating to getpwnam)
posix.seteuid('root');
assert.deepEqual(mockCalls[mockCalls.length - 1], ['seteuid', 0], 'posix.seteuid with root must resolve to uid 0');

posix.seteuid('nobody');
assert.deepEqual(mockCalls[mockCalls.length - 1], ['seteuid', 65534], 'posix.seteuid with nobody must resolve to uid 65534');

console.log('Contract tests passed successfully.');