fix(gbrain-sync): defensive guards against destructive gbrain ops (#1734)

The orchestrator shelled out to gbrain's destructive subcommands as if they were
safe. gbrain can rm-rf a user's working tree during an autopilot race (its own
bug, upstream gbrain #1526); gstack now defends itself. New lib/gbrain-guards.ts
gates the two destructive reach points, all checked immediately before the op:

- Autopilot refuse (multi-signal, affirmative-only): refuse a destructive op when
  a live 'gbrain autopilot' process (primary) or a known autopilot lock file
  (secondary; checked under both GBRAIN_HOME and ~/.gbrain since gbrain #1226
  ignores GBRAIN_HOME) is present. No signal → proceed; inability to introspect
  never bricks a normal sync.
- sources remove: routed through safeSourcesRemove → decideSourceRemove. Fail
  CLOSED — refuse to remove a user-managed source (remote_url set, local_path
  outside gbrain's clones) when gbrain has no --keep-storage to protect the files
  (it doesn't in 0.41.x). Also fail closed when the source list can't be read.
  Path containment uses realpath so a symlink can't smuggle a delete out of clones.
- sync --strategy code: decideCodeSync refuses URL-managed sources (remote_url
  set) unless --allow-reclone is passed, since the walk can auto-reclone (rm-rf).

Capability detection memoizes per process keyed to gbrain's identity (no stale
persistent cache); --keep-storage can't be probed (generic help) so it defaults
unsupported → fail closed. Every guard surfaces a visible reason; autopilot/reclone
refusals fail the code stage (verdict ERR) rather than silently skipping protection.

test/gbrain-guards.test.ts covers all branches hermetically (injected rows + probe
overrides): autopilot signals, fail-closed remove, keep-storage path, reclone gate,
realpath/symlink containment. Supersedes #1736 (which guarded a nonexistent path).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Garry Tan 2026-05-30 10:49:31 -07:00
parent 9e48669c61
commit 8933cf7c0e
No known key found for this signature in database
GPG Key ID: C1F69E85C74EFE1D
3 changed files with 484 additions and 19 deletions

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@ -38,6 +38,7 @@ import { createHash } from "crypto";
import "../lib/conductor-env-shim";
import { detectEngineTier, withErrorContext, canonicalizeRemote } from "../lib/gstack-memory-helpers";
import { ensureSourceRegistered, sourcePageCount, parseSourcesList } from "../lib/gbrain-sources";
import { detectAutopilot, decideSourceRemove, decideCodeSync } from "../lib/gbrain-guards";
import { localEngineStatus, type LocalEngineStatus } from "../lib/gbrain-local-status";
import { buildGbrainEnv, spawnGbrain, execGbrainJson, NEEDS_SHELL_ON_WINDOWS } from "../lib/gbrain-exec";
@ -52,6 +53,8 @@ interface CliArgs {
noMemory: boolean;
noBrainSync: boolean;
codeOnly: boolean;
/** #1734: opt-in to sync a URL-managed source whose code walk may auto-reclone. */
allowReclone: boolean;
}
interface CodeStageDetail {
@ -59,7 +62,7 @@ interface CodeStageDetail {
source_path?: string;
page_count?: number | null;
last_imported?: string;
status?: "ok" | "skipped" | "failed";
status?: "ok" | "skipped" | "failed" | "refused-autopilot" | "refused-reclone";
}
interface StageResult {
@ -205,6 +208,8 @@ Options:
--no-memory Skip the gstack-memory-ingest stage (transcripts + artifacts).
--no-brain-sync Skip the gstack-brain-sync git pipeline stage.
--code-only Only run the code-import stage (alias for --no-memory --no-brain-sync).
--allow-reclone Permit the code walk for URL-managed sources (remote_url set)
even though gbrain may auto-reclone the working tree (#1734).
--help This text.
Stages run in order: code memory ingest curated git push.
@ -220,6 +225,7 @@ function parseArgs(): CliArgs {
let noMemory = false;
let noBrainSync = false;
let codeOnly = false;
let allowReclone = false;
for (let i = 0; i < args.length; i++) {
const a = args[i];
@ -231,6 +237,7 @@ function parseArgs(): CliArgs {
case "--no-code": noCode = true; break;
case "--no-memory": noMemory = true; break;
case "--no-brain-sync": noBrainSync = true; break;
case "--allow-reclone": allowReclone = true; break;
case "--code-only":
codeOnly = true;
noMemory = true;
@ -247,7 +254,7 @@ function parseArgs(): CliArgs {
}
}
return { mode, quiet, noCode, noMemory, noBrainSync, codeOnly };
return { mode, quiet, noCode, noMemory, noBrainSync, codeOnly, allowReclone };
}
// ── Helpers ────────────────────────────────────────────────────────────────
@ -466,20 +473,50 @@ export function planHostnameFoldMigration(
return { kind: "pending-cleanup", oldId: legacyPathHashId };
}
export interface GuardedRemoveResult {
removed: boolean;
/** True when a guard refused the remove (autopilot active or unsafe source). */
skipped: boolean;
reason: string;
}
/**
* #1734: run `gbrain sources remove <id> --confirm-destructive` only behind the
* data-loss guards. Checked immediately before the destructive op (E8: as late
* as possible) so the autopilot window is as small as we can make it without a
* gbrain-side lease. Refuses when autopilot is active or when the source is
* user-managed and gbrain can't keep its storage. Pure side-effect helper; the
* caller decides whether a skip is fatal (it never is today removes are
* best-effort cleanup).
*/
export function safeSourcesRemove(sourceId: string, env?: NodeJS.ProcessEnv): GuardedRemoveResult {
const ap = detectAutopilot(env);
if (ap.active) {
return {
removed: false,
skipped: true,
reason: `autopilot active (${ap.signal}); refusing destructive remove of ${sourceId}. ` +
`Stop autopilot, then re-run /sync-gbrain.`,
};
}
const decision = decideSourceRemove(sourceId, env);
if (!decision.allow) {
return { removed: false, skipped: true, reason: decision.reason };
}
const r = spawnGbrain(
["sources", "remove", sourceId, "--confirm-destructive", ...decision.extraArgs],
{ baseEnv: env },
);
return { removed: r.status === 0, skipped: false, reason: decision.reason };
}
/**
* Remove an orphaned source. Called only after new-source sync verifies pages
* exist, so the old source is provably redundant before deletion.
*
* Flag note: existing call sites used `--confirm-destructive` here and
* `--yes` in `lib/gbrain-sources.ts` gbrain 0.35.0.0 accepts neither
* deterministically (the subcommand surface help is generic). We pass
* `--confirm-destructive` to match the existing call site convention; the
* flag-helper centralization in commit 4 (lib/gbrain-exec.ts) will resolve
* the inconsistency across the codebase.
* exist, so the old source is provably redundant before deletion. Routed through
* safeSourcesRemove for the #1734 guards.
*/
export function removeOrphanedSource(oldId: string, env?: NodeJS.ProcessEnv): boolean {
const r = spawnGbrain(["sources", "remove", oldId, "--confirm-destructive"], { baseEnv: env });
return r.status === 0;
return safeSourcesRemove(oldId, env).removed;
}
/**
@ -658,13 +695,12 @@ async function runCodeImport(args: CliArgs): Promise<StageResult> {
const legacyId = deriveLegacyCodeSourceId(root);
let legacyRemoved = false;
if (legacyId !== sourceId) {
const rm = spawnGbrain(["sources", "remove", legacyId, "--confirm-destructive"], {
timeout: 30_000,
baseEnv: gbrainEnv,
});
// Treat absent-source as success (clean state). gbrain emits "not found" on
// missing id; treat any non-zero exit without "not found" as a soft fail.
if (rm.status === 0) legacyRemoved = true;
// #1734: route through the data-loss guards (autopilot + source-safety).
const rm = safeSourcesRemove(legacyId, gbrainEnv);
if (rm.skipped && !args.quiet) {
console.error(`[sync:code] legacy-source cleanup skipped: ${rm.reason}`);
}
if (rm.removed) legacyRemoved = true;
}
// Step 0b: Hostname-fold migration (#1414).
@ -717,6 +753,29 @@ async function runCodeImport(args: CliArgs): Promise<StageResult> {
process.env.GSTACK_SYNC_CODE_TIMEOUT_MS,
"GSTACK_SYNC_CODE_TIMEOUT_MS",
);
// #1734 guards, checked immediately before the destructive walk (E8):
// - autopilot active → refuse (the race that wiped a working tree).
// - URL-managed source → the walk can auto-reclone (rm-rf); require
// --allow-reclone. Both surface a visible reason and fail the stage so the
// verdict shows ERR rather than silently skipping protection.
const apBeforeWalk = detectAutopilot(gbrainEnv);
if (apBeforeWalk.active) {
return {
name: "code", ran: true, ok: false, duration_ms: Date.now() - t0,
summary: `refused: gbrain autopilot active (${apBeforeWalk.signal}). Stop autopilot, then re-run /sync-gbrain.`,
detail: { source_id: sourceId, source_path: root, status: "refused-autopilot" },
};
}
const reclone = decideCodeSync(sourceId, gbrainEnv, args.allowReclone);
if (!reclone.allow) {
return {
name: "code", ran: true, ok: false, duration_ms: Date.now() - t0,
summary: `refused: ${reclone.reason}`,
detail: { source_id: sourceId, source_path: root, status: "refused-reclone" },
};
}
const walkResult = spawnGbrain(["sync", "--strategy", "code", "--source", sourceId], {
stdio: args.quiet ? ["ignore", "ignore", "ignore"] : ["ignore", "inherit", "inherit"],
timeout: codeTimeoutMs,

266
lib/gbrain-guards.ts Normal file
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@ -0,0 +1,266 @@
/**
* gbrain-guards defense-in-depth against gbrain's destructive code paths (#1734).
*
* gbrain (the separate CLI gstack shells out to) can rm-rf a user's working tree
* during an autopilot race (its own bug, upstream gbrain #1526). gstack can't fix
* that, but it MUST stop treating gbrain's destructive subcommands as safe. These
* guards gate the two ways the orchestrator can reach destruction:
*
* 1. `sources remove --confirm-destructive` decideSourceRemove()
* 2. `sync --strategy code` (can auto-reclone) decideCodeSync()
*
* plus an autopilot-active check (detectAutopilot) that refuses to run destructive
* ops concurrently with the daemon.
*
* Design notes grounded in the real gbrain 0.41.x surface:
* - There is NO `--keep-storage` flag and NO structured capability command, and
* subcommand `--help` is generic so capability detection is best-effort and
* defaults to "unsupported". When we can't protect a user-managed source's
* files, we FAIL CLOSED (refuse the remove) rather than delete unprotected.
* - The autopilot lock filename isn't documented and (gbrain #1226) ignores
* GBRAIN_HOME, so the live `gbrain autopilot` process is the PRIMARY signal;
* known lock paths under both the configured home and ~/.gbrain are secondary.
* - We refuse only on an AFFIRMATIVE autopilot signal inability to introspect
* never blocks a normal sync (that would brick the tool).
* - Path containment uses realpath so a symlink inside ~/.gbrain/clones can't
* smuggle a delete out to a user repo.
*
* Pure decision functions; the orchestrator logs the reasons (observability).
*/
import { spawnSync } from "child_process";
import { existsSync, realpathSync } from "fs";
import { homedir } from "os";
import { join, resolve, sep } from "path";
import { execGbrainJson, execGbrainText, NEEDS_SHELL_ON_WINDOWS } from "./gbrain-exec";
import { parseSourcesList, type GbrainSourceRow } from "./gbrain-sources";
export function gbrainHome(env: NodeJS.ProcessEnv = process.env): string {
return env.GBRAIN_HOME || join(homedir(), ".gbrain");
}
/**
* Directories gbrain owns and may delete safely. A source whose local_path
* resolves inside one of these is gbrain-managed; outside = user-managed and
* must be protected. Both the configured home and the default ~/.gbrain are
* checked because gbrain #1226 shows home-resolution is inconsistent.
*/
function clonesDirs(env: NodeJS.ProcessEnv = process.env): string[] {
return [...new Set([join(gbrainHome(env), "clones"), join(homedir(), ".gbrain", "clones")])];
}
/** True if `p` resolves (symlinks + `..` collapsed) to a location inside `dir`. */
export function isInside(p: string, dir: string): boolean {
let rp: string;
let rd: string;
try { rp = realpathSync(p); } catch { rp = resolve(p); }
try { rd = realpathSync(dir); } catch { rd = resolve(dir); }
const base = rd.endsWith(sep) ? rd : rd + sep;
return rp === rd || rp.startsWith(base);
}
// ── Autopilot detection (E1: multi-signal, affirmative-only) ────────────────
export interface AutopilotStatus {
active: boolean;
/** Which signal fired (lock path or "process"), or null when inactive. */
signal: string | null;
}
export interface AutopilotProbe {
/** Override the lock-path list (tests). */
lockPaths?: string[];
/** Override the live-process check (tests). */
processRunning?: () => boolean;
}
/**
* Detect a running gbrain autopilot. Refuse the caller's destructive op only on
* an affirmative signal; absence of a confirmable mechanism returns inactive so
* normal syncs are never bricked.
*/
export function detectAutopilot(
env: NodeJS.ProcessEnv = process.env,
probe: AutopilotProbe = {},
): AutopilotStatus {
// Secondary signal: known lock files. gbrain #1226 — the lock ignores
// GBRAIN_HOME, so check both the configured home and the default ~/.gbrain.
const lockPaths = probe.lockPaths ?? [
join(gbrainHome(env), "autopilot.lock"),
join(homedir(), ".gbrain", "autopilot.lock"),
join(gbrainHome(env), "autopilot.pid"),
join(homedir(), ".gbrain", "autopilot.pid"),
];
for (const lp of lockPaths) {
if (existsSync(lp)) return { active: true, signal: `lock:${lp}` };
}
// Primary signal: a live `gbrain autopilot` process.
const running = (probe.processRunning ?? defaultProcessRunning)();
if (running) return { active: true, signal: "process:gbrain autopilot" };
return { active: false, signal: null };
}
function defaultProcessRunning(): boolean {
// No reliable pgrep on Windows; rely on the lock-file signal there.
if (process.platform === "win32") return false;
const r = spawnSync("pgrep", ["-f", "gbrain autopilot"], { encoding: "utf-8", timeout: 3_000 });
return r.status === 0 && (r.stdout || "").trim().length > 0;
}
// ── Capability detection (E4 + Codex: per-process memo, no persistent cache) ─
//
// No structured capability command exists and subcommand --help is generic, so
// --keep-storage support can't be probed reliably; default unsupported. Memoize
// per process (keyed to the resolved gbrain identity) rather than persisting a
// cross-run cache — Codex flagged stale persistent caches, and the probe is cheap.
let _keepStorageMemo: { key: string; value: boolean } | undefined;
function gbrainIdentity(env: NodeJS.ProcessEnv): string {
const r = spawnSync("gbrain", ["--version"], {
encoding: "utf-8",
timeout: 3_000,
shell: NEEDS_SHELL_ON_WINDOWS,
env,
});
return (r.stdout || "").trim() || "unknown";
}
export function gbrainSupportsKeepStorage(env: NodeJS.ProcessEnv = process.env): boolean {
const key = gbrainIdentity(env);
if (_keepStorageMemo && _keepStorageMemo.key === key) return _keepStorageMemo.value;
let value = false;
for (const args of [["sources", "remove", "--help"], ["--help"]]) {
try {
if (/--keep-storage/.test(execGbrainText(args, { baseEnv: env, timeout: 5_000 }))) {
value = true;
break;
}
} catch {
// generic/empty help or non-zero exit → treat as unsupported
}
}
_keepStorageMemo = { key, value };
return value;
}
/** Test-only: reset the per-process capability memo. */
export function _resetCapabilityMemo(): void {
_keepStorageMemo = undefined;
}
// ── Destructive-op decisions ────────────────────────────────────────────────
/**
* Fetch + normalize the source list. Throws on read/parse failure so callers can
* distinguish "couldn't read" (fail closed) from "empty list" (source absent).
* Injectable for hermetic tests.
*/
export function fetchSources(env: NodeJS.ProcessEnv = process.env): GbrainSourceRow[] {
const raw = execGbrainJson(["sources", "list", "--json"], { baseEnv: env });
if (raw === null) throw new Error("gbrain sources list returned no JSON");
return parseSourcesList(raw);
}
export interface RemoveDecision {
allow: boolean;
/** Extra args to append to `sources remove` (e.g. --keep-storage). */
extraArgs: string[];
reason: string;
}
/**
* Decide whether `sources remove <id>` is safe, and with what flags.
*
* Fail-closed cases (allow=false):
* - sources list unreadable/unparseable (can't prove the row is safe).
* - the row is user-managed (remote_url set AND local_path outside gbrain's
* clones) and gbrain has no --keep-storage to protect the files.
*
* Allowed: absent row (no-op), gbrain-managed (inside clones), or path-managed
* without a remote_url (gbrain's remove won't touch an outside-clones path that
* it didn't clone). --keep-storage is appended whenever supported, as extra armor.
*/
export interface DecideRemoveOpts {
/** Override capability detection (tests / cached caps). */
keepStorage?: boolean;
/** Override the source-list fetch (tests). Throwing simulates a read failure. */
fetchRows?: (env: NodeJS.ProcessEnv) => GbrainSourceRow[];
}
export function decideSourceRemove(
sourceId: string,
env: NodeJS.ProcessEnv = process.env,
opts: DecideRemoveOpts = {},
): RemoveDecision {
const keepStorage = opts.keepStorage ?? gbrainSupportsKeepStorage(env);
const extra = keepStorage ? ["--keep-storage"] : [];
let rows: GbrainSourceRow[];
try {
rows = (opts.fetchRows ?? fetchSources)(env);
} catch {
return { allow: false, extraArgs: [], reason: "could not read sources list; refusing remove (fail closed)" };
}
const row = rows.find((r) => r.id === sourceId);
if (!row) return { allow: true, extraArgs: extra, reason: "source absent (no-op)" };
const remoteUrl = row.config?.remote_url;
const userManaged =
!!remoteUrl && !!row.local_path && !clonesDirs(env).some((d) => isInside(row.local_path!, d));
if (userManaged) {
if (keepStorage) {
return { allow: true, extraArgs: ["--keep-storage"], reason: "user-managed; --keep-storage protects files" };
}
return {
allow: false,
extraArgs: [],
reason:
`refusing remove of user-managed source "${sourceId}" (remote_url set, local_path ` +
`${row.local_path} outside gbrain clones) — this gbrain has no --keep-storage to ` +
`protect the working tree. Upgrade gbrain or remove the source manually.`,
};
}
return { allow: true, extraArgs: extra, reason: "gbrain-managed or path-managed without remote_url" };
}
export interface SyncDecision {
allow: boolean;
reason: string;
}
/**
* Decide whether `sync --strategy code --source <id>` is safe to run.
*
* A source with a remote_url can trigger gbrain's auto-reclone, the ungated
* rm-rf path behind the data loss (gbrain #1526). Require an explicit
* --allow-reclone opt-in for URL-managed sources. Read failure here is NOT
* itself destructive, so it fails open (proceed) the autopilot guard, checked
* first, is the primary protection against the race that caused the loss.
*/
export function decideCodeSync(
sourceId: string,
env: NodeJS.ProcessEnv = process.env,
allowReclone = false,
fetchRows: (env: NodeJS.ProcessEnv) => GbrainSourceRow[] = fetchSources,
): SyncDecision {
let rows: GbrainSourceRow[];
try {
rows = fetchRows(env);
} catch {
return { allow: true, reason: "sources unreadable; proceeding (sync read is non-destructive)" };
}
const row = rows.find((r) => r.id === sourceId);
if (row?.config?.remote_url && !allowReclone) {
return {
allow: false,
reason:
`source "${sourceId}" is URL-managed (remote_url set); sync may auto-reclone and ` +
`delete the working tree. Re-run /sync-gbrain with --allow-reclone to proceed.`,
};
}
return { allow: true, reason: "no remote_url, or reclone explicitly allowed" };
}

140
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@ -0,0 +1,140 @@
import { describe, test, expect, afterEach } from "bun:test";
import * as fs from "fs";
import * as os from "os";
import { join } from "path";
import {
detectAutopilot,
decideSourceRemove,
decideCodeSync,
isInside,
_resetCapabilityMemo,
type GbrainSourceRow,
} from "../lib/gbrain-guards";
const HOME = os.homedir();
const clonesPath = (name: string) => join(HOME, ".gbrain", "clones", name);
afterEach(() => _resetCapabilityMemo());
// ── #1734 autopilot detection (E1: affirmative multi-signal) ────────────────
describe("detectAutopilot", () => {
test("refuses on a present lock file (secondary signal)", () => {
const tmp = fs.mkdtempSync(join(os.tmpdir(), "ap-"));
const lock = join(tmp, "autopilot.lock");
fs.writeFileSync(lock, "");
const r = detectAutopilot(process.env, { lockPaths: [lock], processRunning: () => false });
expect(r.active).toBe(true);
expect(r.signal).toContain("lock:");
});
test("refuses on a live autopilot process (primary signal)", () => {
const r = detectAutopilot(process.env, { lockPaths: [], processRunning: () => true });
expect(r.active).toBe(true);
expect(r.signal).toBe("process:gbrain autopilot");
});
test("proceeds when no signal fires (never blanket-refuses)", () => {
const r = detectAutopilot(process.env, { lockPaths: [], processRunning: () => false });
expect(r.active).toBe(false);
expect(r.signal).toBeNull();
});
});
// ── #1734 remove safety (E7: fail closed on user-managed without keep-storage) ─
describe("decideSourceRemove", () => {
const rows = (extra: GbrainSourceRow[] = []): GbrainSourceRow[] => [
{ id: "gbrain-managed", local_path: clonesPath("repo"), config: { remote_url: "https://x/r.git" } },
{ id: "user-managed", local_path: "/tmp/user-repo", config: { remote_url: "https://x/r.git" } },
{ id: "path-managed", local_path: "/tmp/path-repo" }, // no remote_url
...extra,
];
const fetchRows = (extra?: GbrainSourceRow[]) => () => rows(extra);
test("absent source → allow (no-op)", () => {
const d = decideSourceRemove("nope", process.env, { keepStorage: false, fetchRows: fetchRows() });
expect(d.allow).toBe(true);
expect(d.reason).toContain("absent");
});
test("user-managed + no --keep-storage → FAIL CLOSED", () => {
const d = decideSourceRemove("user-managed", process.env, { keepStorage: false, fetchRows: fetchRows() });
expect(d.allow).toBe(false);
expect(d.reason).toContain("user-managed");
});
test("user-managed + --keep-storage supported → allow with flag", () => {
const d = decideSourceRemove("user-managed", process.env, { keepStorage: true, fetchRows: fetchRows() });
expect(d.allow).toBe(true);
expect(d.extraArgs).toContain("--keep-storage");
});
test("gbrain-managed (inside clones) → allow even without keep-storage", () => {
const d = decideSourceRemove("gbrain-managed", process.env, { keepStorage: false, fetchRows: fetchRows() });
expect(d.allow).toBe(true);
});
test("path-managed without remote_url → allow (normal --path case)", () => {
const d = decideSourceRemove("path-managed", process.env, { keepStorage: false, fetchRows: fetchRows() });
expect(d.allow).toBe(true);
});
test("sources unreadable → FAIL CLOSED", () => {
const d = decideSourceRemove("user-managed", process.env, {
keepStorage: false,
fetchRows: () => { throw new Error("boom"); },
});
expect(d.allow).toBe(false);
expect(d.reason).toContain("fail closed");
});
});
// ── #1734 reclone guard (E-level: require --allow-reclone for URL-managed) ───
describe("decideCodeSync", () => {
const rows: GbrainSourceRow[] = [
{ id: "url-managed", local_path: "/tmp/u", config: { remote_url: "https://x/r.git" } },
{ id: "plain", local_path: "/tmp/p" },
];
const fetch = () => rows;
test("URL-managed + no --allow-reclone → refuse", () => {
const d = decideCodeSync("url-managed", process.env, false, fetch);
expect(d.allow).toBe(false);
expect(d.reason).toContain("auto-reclone");
});
test("URL-managed + --allow-reclone → allow", () => {
const d = decideCodeSync("url-managed", process.env, true, fetch);
expect(d.allow).toBe(true);
});
test("no remote_url → allow", () => {
const d = decideCodeSync("plain", process.env, false, fetch);
expect(d.allow).toBe(true);
});
test("sources unreadable → fail OPEN (sync read is non-destructive)", () => {
const d = decideCodeSync("url-managed", process.env, false, () => { throw new Error("boom"); });
expect(d.allow).toBe(true);
});
});
// ── path containment uses realpath (symlink can't smuggle a delete out) ──────
describe("isInside", () => {
test("plain path inside dir", () => {
expect(isInside("/a/b/c", "/a/b")).toBe(true);
expect(isInside("/a/x", "/a/b")).toBe(false);
});
test("sibling-prefix is not 'inside' (clonesX vs clones)", () => {
expect(isInside("/a/clones-evil/x", "/a/clones")).toBe(false);
});
test("symlink pointing outside resolves outside", () => {
const base = fs.mkdtempSync(join(os.tmpdir(), "clones-"));
const outside = fs.mkdtempSync(join(os.tmpdir(), "outside-"));
const link = join(base, "sneaky");
fs.symlinkSync(outside, link);
// link lives under base, but realpath resolves to `outside` → not inside base.
expect(isInside(link, base)).toBe(false);
});
});