platform/src/servers/read-as-user.live.test.ts

import { describe, expect, test } from 'bun:test';
import { join } from 'node:path';
import { runAsArgv } from './os-user';
import { findPathAs, realpathAs } from './read-as-user';

// Can the platform LOCATE a member's file? Same shape as `spawn-as-member.live.test.ts`, and for the same
// reason: the failure only exists where a second Linux account does, which is the production host and no
// developer machine.
//
// ── The bug this pins ──
//
// `findTaskOutput` globbed `/tmp/claude-*/…` as the platform's own uid. `/tmp/claude-<uid>` is `drwx------`,
// so for a member the glob matched nothing — and a glob that cannot traverse does not throw, it returns an
// empty iterator. Downstream that read as "no such task", which a member saw as a background job that
// streamed no logs and answered `{"stopped":false,"reason":"no such task"}` on Stop.
//
// The assertion is the two identities DISAGREEING. A test that only checked `findPathAs(member, …)` finds
// the file would pass just as happily on a world-readable tree, which is not the situation that broke.
//
// ── Running it ──
//
//   OFFICER_TEST_MEMBER=green bun test src/servers/read-as-user.live.test.ts
//
// Skips without it. A skipped run is not a pass; the log says which it was.

const osUser = process.env.OFFICER_TEST_MEMBER;
const live = Boolean(osUser);

const runAs = (user: string, command: string[]) => {
  const result = Bun.spawnSync(runAsArgv(user, command), { stdout: 'pipe', stderr: 'pipe' });
  if (result.exitCode !== 0) {
    throw new Error(`as ${user}: ${new TextDecoder().decode(result.stderr).trim() || `exit ${result.exitCode}`}`);
  }
  return new TextDecoder().decode(result.stdout).trim();
};

describe.skipIf(!live)(`findPathAs (live, as ${osUser ?? 'nobody'})`, () => {
  const user = osUser!;
  // The real layout, at the real depth: <tmp>/claude-<uid>/<slug>/<session>/tasks/<id>.output
  const uid = live ? runAs(user, ['id', '-u']) : '';
  const taskId = 'blivetest01';
  const dir = join('/tmp', `claude-${uid}`, '-live-test-slug', 'live-test-session', 'tasks');
  const file = join(dir, `${taskId}.output`);

  test('the member can be found where the platform is blind', () => {
    // Created BY the member, so its modes are the ones `claude` would produce rather than ones we chose.
    runAs(user, ['mkdir', '-p', dir]);
    runAs(user, ['sh', '-c', 'printf "live\\n" > "$1"', '_', file]);
    runAs(user, ['chmod', '700', join('/tmp', `claude-${uid}`)]);

    try {
      const predicate = ['-mindepth', '5', '-maxdepth', '5', '-name', `${taskId}.output`];

      // As the member: found.
      expect(findPathAs(user, '/tmp', predicate)).toBe(file);

      // As the platform: NOT found — this is the half that used to be the only half.
      expect(findPathAs(null, '/tmp', predicate)).toBeNull();
    } finally {
      runAs(user, ['rm', '-rf', join('/tmp', `claude-${uid}`, '-live-test-slug')]);
    }
  });

  test('a symlink under the member tree resolves as them and not as us', () => {
    // An AGENT task's `.output` is a symlink into the member's own `~/.claude/.../subagents/*.jsonl`.
    // Resolving it as the platform threw EACCES on an intact link, which the caller reported as dangling —
    // the layer below the lookup, and identical on screen: "Nothing written yet", forever.
    runAs(user, ['mkdir', '-p', dir]);
    runAs(user, ['sh', '-c', 'printf "live\\n" > "$1"; ln -sf "$1" "$2"', '_', file, `${file}.link`]);
    try {
      expect(realpathAs(user, `${file}.link`)).toBe(file);
      expect(realpathAs(null, `${file}.link`)).toBeNull();
    } finally {
      runAs(user, ['rm', '-rf', join('/tmp', `claude-${uid}`, '-live-test-slug')]);
    }
  });

  test('a task id that does not exist is null, not a throw', () => {
    expect(findPathAs(user, '/tmp', ['-mindepth', '5', '-maxdepth', '5', '-name', 'no-such-task.output'])).toBeNull();
  });

  test('an unreadable directory in the walk does not discard a real match', () => {
    // `find /tmp` from any identity hits another account's `drwx------` and exits 1 having already printed
    // what it found. This is the regression that cost the first version of the fix: the match was located
    // and then thrown away with the exit code.
    runAs(user, ['mkdir', '-p', dir]);
    runAs(user, ['sh', '-c', 'printf "live\\n" > "$1"', '_', file]);
    try {
      expect(findPathAs(user, '/tmp', ['-mindepth', '5', '-maxdepth', '5', '-name', `${taskId}.output`])).toBe(file);
    } finally {
      runAs(user, ['rm', '-rf', join('/tmp', `claude-${uid}`, '-live-test-slug')]);
    }
  });
});