v1.91.152.0 fix(cso): start and run on repos with nested Git repos, long history, and macOS sockets (#3255, #3248) (#3303)

* fix(cso): record a nested repository as an explicit snapshot exclusion

An untracked nested repository makes gstack-cso start fail with
UNSAFE_PATH. Git lists it as one entry with a trailing slash, so
relativePath() rejected the empty segment and aborted the run. A
registered submodule gitlink already failed one step later for the same
reason: it is a directory, and the capture loop only reads regular
files.

Accept the boundary under its own name and record it like a host
dependency tree: one manifest entry, originalHash not-read, an
excluded: transformation that discloses the omission in the report's
snapshot-inputs coverage, no payload copied, and an identity check
during capture so a swapped or symlinked boundary fails closed. Nested
repository contents are never audited with the outer repository because
Git never descends into them.

* fix(cso): keep the newest whole commits when history exceeds the 1 MiB bound (#3255)

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* test(cso): regressions and negative controls for nested repos, long history and macOS sockets (#3255, #3248)

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* docs(changelog): blank line before 1.91.149.0

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* test(cso): set GSTACK_HOME in beforeAll, not at module scope

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* chore: stamp v1.91.152.0

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

---------

Co-authored-by: Chao Chen <209239467+surlymochan@users.noreply.github.com>
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>
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// Regressions for /cso on ordinary user repositories: an untracked nested Git
// repository (#3255 bug 1), a patch history over the 1 MiB bound (#3255 bug 2),
// and a Docker socket that realpath refuses to open (#3248).
import { afterAll, afterEach, beforeAll, describe, expect, spyOn, test } from 'bun:test';
import * as fs from 'node:fs';
import * as net from 'node:net';
import * as os from 'node:os';
import * as path from 'node:path';
import { spawnSync } from 'node:child_process';
import { NESTED_REPOSITORY, capture, historyMarker } from '../lib/cso/snapshot';
import { newRun, readJson } from '../lib/cso/state';
import { MAX_OUTPUT } from '../lib/cso/contracts';
import { dockerEndpoint } from '../lib/cso/docker';
import { TRUSTED_DIRECTORIES } from '../lib/cso/process';
const ROOT = path.resolve(import.meta.dir, '..');
const launcher = path.join(ROOT, 'bin', process.platform === 'win32' ? 'gstack-cso-launcher.exe' : 'gstack-cso-launcher');
const MIB = 1024 * 1024;
const CREDENTIAL_CANARY = ['ghp_', 'abcdefghijklmnopqrstuvwxyz1234567890'].join('');
const OLD_CANARY = ['ghp_', 'zyxwvutsrqponmlkjihgfedcba0987654321'].join('');
const MARKER = '[gstack-cso history truncated:';
const roots: string[] = [];
const originalHome = process.env.GSTACK_HOME;
let state = '';
beforeAll(() => {
state = fs.realpathSync(fs.mkdtempSync(path.join(os.tmpdir(), 'cso-ordinary-state-')));
process.env.GSTACK_HOME = state;
});
afterEach(() => {
for (const root of roots.splice(0)) fs.rmSync(root, { recursive: true, force: true });
});
afterAll(() => {
if (originalHome === undefined) delete process.env.GSTACK_HOME;
else process.env.GSTACK_HOME = originalHome;
fs.rmSync(state, { recursive: true, force: true });
});
function tmp(): string {
const root = fs.realpathSync(fs.mkdtempSync(path.join(os.tmpdir(), 'cso-ordinary-')));
roots.push(root);
return root;
}
function git(repo: string, ...args: string[]): string {
const result = spawnSync('/usr/bin/git', ['-C', repo, ...args], { encoding: 'utf8', env: { HOME: path.dirname(repo), PATH: '/usr/bin:/bin' }, timeout: 60_000 });
if (result.status) throw new Error(result.stderr);
return result.stdout;
}
function init(repo: string): string {
fs.mkdirSync(repo, { recursive: true });
git(repo, 'init', '-q');
git(repo, 'config', 'user.email', 'fixture@example.test');
git(repo, 'config', 'user.name', 'Fixture');
return repo;
}
function commit(repo: string, files: Record<string, string>, subject: string): void {
for (const [file, body] of Object.entries(files)) fs.writeFileSync(path.join(repo, file), body);
git(repo, 'add', '-A');
git(repo, 'commit', '-qm', subject);
}
function filler(tag: string, bytes: number): string {
const lines: string[] = [];
for (let i = 0, size = 0; size < bytes; i++) {
const line = `export const ${tag}${i} = ${i};`;
lines.push(line);
size += line.length + 1;
}
return lines.join('\n') + '\n';
}
function nestedRepository(outer: string, name: string, files: Record<string, string>): string {
const inner = init(path.join(outer, name));
commit(inner, files, 'inner');
return inner;
}
function cso(repo: string, args: string[]) {
return spawnSync(launcher, args, { cwd: repo, encoding: 'utf8', env: { HOME: path.dirname(repo), GSTACK_HOME: state, PATH: '/usr/bin:/bin' }, timeout: 120_000, maxBuffer: 64 * MIB });
}
function runFiles(dir: string): string[] {
return fs.readdirSync(dir, { recursive: true, withFileTypes: true }).filter((item) => item.isFile()).map((item) => path.join(item.parentPath, item.name));
}
describe('CSO start on a repository with an untracked nested repository (#3255 bug 1)', () => {
test('start succeeds, records the boundary as an explicit exclusion, and never reads the nested source', () => {
const repo = init(path.join(tmp(), 'repo'));
commit(repo, { 'README.md': 'outer\n' }, 'outer');
nestedRepository(repo, 'inner', { 'secret.txt': `TOKEN=${CREDENTIAL_CANARY}\n` });
const started = cso(repo, ['start', '--repo', repo, '--scope', 'auth', '--offline']);
expect(started.stderr).toBe('');
expect(started.status).toBe(0);
const run = JSON.parse(started.stdout),
dir = path.join(state, 'security', 'cso', run.repoId, run.runId),
report = readJson(path.join(dir, 'report.json')),
snapshot = report.coverage.find((item: any) => item.domain === 'snapshot-inputs');
expect(snapshot.exclusions).toEqual([`inner: ${NESTED_REPOSITORY}`]);
expect(snapshot.gaps).toEqual([]);
for (const file of runFiles(dir)) expect(fs.readFileSync(file, 'utf8')).not.toContain(CREDENTIAL_CANARY);
expect(fs.existsSync(path.join(dir, 'snapshot', 'inner'))).toBe(false);
expect(fs.existsSync(path.join(dir, 'readable', 'inner'))).toBe(false);
});
test('negative control: an untracked symlink to a directory is still refused, not treated as a boundary', () => {
const root = tmp(),
repo = init(path.join(root, 'repo')),
outside = path.join(root, 'outside');
commit(repo, { 'README.md': 'outer\n' }, 'outer');
nestedRepository(repo, 'inner', { 'f.txt': 'x\n' });
fs.mkdirSync(outside);
fs.writeFileSync(path.join(outside, 'host.txt'), 'host\n');
fs.symlinkSync(outside, path.join(repo, 'escape'));
const started = cso(repo, ['start', '--repo', repo, '--scope', 'auth', '--offline']);
expect(started.status).not.toBe(0);
expect(JSON.parse(started.stderr).error).toMatchObject({ code: 'UNSAFE_PATH', message: expect.stringContaining('escape') });
});
test('negative control: a nested repository swapped for another directory during capture fails as a snapshot race', async () => {
const root = tmp(),
repo = init(path.join(root, 'repo')),
target = path.join(repo, 'vendor', 'inner'),
replacement = path.join(root, 'replacement');
commit(repo, { 'README.md': 'outer\n' }, 'outer');
fs.mkdirSync(path.join(repo, 'vendor'));
nestedRepository(repo, 'vendor/inner', { 'f.txt': 'x\n' });
nestedRepository(root, 'replacement', { 'f.txt': 'y\n' });
const original = fs.lstatSync;
let hits = 0;
const counting = spyOn(fs, 'lstatSync').mockImplementation(((candidate: any, options?: any) => {
if (path.resolve(String(candidate)) === target) hits++;
return options === undefined ? original(candidate) : original(candidate, options);
}) as typeof fs.lstatSync);
try {
await capture(repo, newRun(repo).dir, 'HEAD');
} finally {
counting.mockRestore();
}
const last = hits;
expect(last).toBeGreaterThan(1);
hits = 0;
let swapped = false;
const swapping = spyOn(fs, 'lstatSync').mockImplementation(((candidate: any, options?: any) => {
if (path.resolve(String(candidate)) === target && ++hits === last) {
fs.renameSync(target, `${target}.parked`);
fs.renameSync(replacement, target);
swapped = true;
}
return options === undefined ? original(candidate) : original(candidate, options);
}) as typeof fs.lstatSync);
try {
await expect(capture(repo, newRun(repo).dir, 'HEAD')).rejects.toMatchObject({ code: 'SNAPSHOT_RACE', message: 'Source changed before snapshot persistence: vendor/inner' });
} finally {
swapping.mockRestore();
}
expect(swapped).toBe(true);
});
});
describe('CSO history capture over the 1 MiB bound (#3255 bug 2)', () => {
test('keeps the newest whole commits that fit, marks the truncation, and still redacts', async () => {
const repo = init(path.join(tmp(), 'repo'));
commit(repo, { 'old.ts': filler('old', 450 * 1024) + `// ${OLD_CANARY}\n` }, 'oldest');
commit(repo, { 'mid.ts': filler('mid', 450 * 1024) }, 'middle');
commit(repo, { 'new.ts': filler('new', 300 * 1024) + `// ${CREDENTIAL_CANARY}\n` }, 'newest');
const run = newRun(repo);
await capture(repo, run.dir);
const status = readJson(path.join(run.dir, 'history-status.json')),
history = fs.readFileSync(path.join(run.dir, 'history.txt'), 'utf8');
expect(status).toMatchObject({ status: 'captured', commits: 2 });
expect(status.truncated).toBe(`the newest 2 of 3 commits were retained with patches; 1 older commits were omitted to stay within the ${MAX_OUTPUT}-byte history limit`);
expect(history.startsWith(historyMarker(status.truncated))).toBe(true);
expect(Buffer.byteLength(history)).toBeLessThanOrEqual(MAX_OUTPUT);
expect(status.bytes).toBe(Buffer.byteLength(history));
expect(history).toContain('Subject: newest');
expect(history).toContain('Subject: middle');
expect(history).not.toContain('Subject: oldest');
expect(history).toContain('diff --git a/new.ts b/new.ts');
expect(history).not.toContain(CREDENTIAL_CANARY);
expect(history).not.toContain(OLD_CANARY);
});
test('falls back to commit metadata when the newest patch alone exceeds the bound, and still redacts', async () => {
const repo = init(path.join(tmp(), 'repo'));
commit(repo, { 'a.ts': 'export const a = 1;\n' }, 'first');
commit(repo, { 'big.ts': filler('big', 1.2 * MIB) }, `rotate ${CREDENTIAL_CANARY}`);
const run = newRun(repo);
await capture(repo, run.dir);
const status = readJson(path.join(run.dir, 'history-status.json')),
history = fs.readFileSync(path.join(run.dir, 'history.txt'), 'utf8');
expect(status).toMatchObject({ status: 'captured', commits: 'metadata for at most 100' });
expect(status.truncated).toMatch(/^patches were withheld because/);
expect(history.startsWith(historyMarker(status.truncated))).toBe(true);
expect(history).toContain('Subject: first');
expect(history).toContain('Subject: rotate');
expect(history).not.toContain('diff --git');
expect(history).not.toContain(CREDENTIAL_CANARY);
});
test('a history within the bound is retained whole with no marker', async () => {
const repo = init(path.join(tmp(), 'repo'));
commit(repo, { 'a.ts': 'export const a = 1;\n' }, 'first');
commit(repo, { 'b.ts': `// ${CREDENTIAL_CANARY}\n` }, 'second');
const run = newRun(repo);
await capture(repo, run.dir);
const status = readJson(path.join(run.dir, 'history-status.json')),
history = fs.readFileSync(path.join(run.dir, 'history.txt'), 'utf8');
expect(status).toEqual({ status: 'captured', range: status.range, commits: 'at most 100', bytes: Buffer.byteLength(history) });
expect(history.startsWith('commit ')).toBe(true);
expect(history).toContain('Subject: first');
expect(history).not.toContain(MARKER);
expect(history).not.toContain(CREDENTIAL_CANARY);
});
test('start reports the truncated history as partial coverage and history stays readable', () => {
const repo = init(path.join(tmp(), 'repo'));
commit(repo, { 'old.ts': filler('old', 700 * 1024) }, 'oldest');
commit(repo, { 'new.ts': filler('new', 700 * 1024) }, 'newest');
const started = cso(repo, ['start', '--repo', repo, '--scope', 'auth', '--offline']);
expect(started.stderr).toBe('');
expect(started.status).toBe(0);
const run = JSON.parse(started.stdout),
report = readJson(path.join(state, 'security', 'cso', run.repoId, run.runId, 'report.json')),
coverage = report.coverage.find((item: any) => item.domain === 'history-inputs');
expect(coverage.status).toBe('partial');
expect(coverage.gaps).toEqual([`History truncated: the newest 1 of 2 commits were retained with patches; 1 older commits were omitted to stay within the ${MAX_OUTPUT}-byte history limit`]);
expect(coverage.evidence[0]).toStartWith('Captured 1 from ');
const whole = cso(repo, ['history', run.runId]);
expect(whole.status).toBe(0);
expect(whole.stdout.startsWith(MARKER)).toBe(true);
const scoped = cso(repo, ['history', run.runId, 'new.ts']);
expect(scoped.status).toBe(0);
expect(scoped.stdout.startsWith('commit ')).toBe(true);
expect(scoped.stdout).toContain('diff --git a/new.ts b/new.ts');
});
});
const dockerInstalled = TRUSTED_DIRECTORIES.some((directory) => fs.existsSync(path.join(directory, 'docker')));
describe.skipIf(process.platform === 'win32' || !dockerInstalled)('CSO Docker endpoint admission when realpath refuses sockets (#3248)', () => {
let root = '';
let socketPath = '';
let server: net.Server;
const realpath = fs.realpathSync;
const refusing = ((candidate: fs.PathLike, ...rest: any[]) => {
let socket = false;
try {
socket = fs.statSync(candidate).isSocket();
} catch {}
if (socket) {
const error = new Error('EOPNOTSUPP: operation not supported on socket') as NodeJS.ErrnoException;
error.code = 'EOPNOTSUPP';
throw error;
}
return realpath(candidate, ...rest);
}) as typeof fs.realpathSync;
beforeAll(async () => {
root = realpath(fs.mkdtempSync(path.join(os.tmpdir(), 'cso-endpoint-')));
socketPath = path.join(root, 'docker.sock');
server = net.createServer();
await new Promise<void>((resolve, reject) => {
server.once('error', reject);
server.listen(socketPath, () => resolve());
});
});
afterAll(async () => {
await new Promise<void>((resolve) => server.close(() => resolve()));
fs.rmSync(root, { recursive: true, force: true });
});
afterEach(() => {
(fs.realpathSync as any).mockRestore?.();
});
const admit = (host: string) => dockerEndpoint(root, { HOME: root, DOCKER_HOST: host });
test('admits a socket reached through a symlinked directory and a symlinked leaf, pinned to its identity', async () => {
const linkedDirectory = path.join(root, 'run'),
leaf = path.join(root, 'colima.sock');
fs.symlinkSync(root, linkedDirectory);
fs.symlinkSync('docker.sock', leaf);
const stub = spyOn(fs, 'realpathSync').mockImplementation(refusing);
const identity = fs.statSync(socketPath);
for (const host of [`unix://${socketPath}`, `unix://${path.join(linkedDirectory, 'colima.sock')}`]) {
const endpoint = await admit(host);
expect(endpoint).toMatchObject({ socket: socketPath, uri: `unix://${socketPath}`, device: identity.dev, inode: identity.ino });
}
expect(stub.mock.calls.some(([candidate]) => String(candidate) === socketPath)).toBe(true);
});
test('negative controls: non-sockets, dangling or looping links, and non-local URIs are still refused', async () => {
spyOn(fs, 'realpathSync').mockImplementation(refusing);
const file = path.join(root, 'plain.sock'),
dangling = path.join(root, 'dangling.sock'),
loopA = path.join(root, 'loop-a.sock'),
loopB = path.join(root, 'loop-b.sock');
fs.writeFileSync(file, '');
fs.symlinkSync(path.join(root, 'missing.sock'), dangling);
fs.symlinkSync(loopB, loopA);
fs.symlinkSync(loopA, loopB);
await expect(admit(`unix://${file}`)).rejects.toMatchObject({ code: 'ISOLATION_FAILED', message: 'Docker endpoint is not a local Unix socket' });
for (const candidate of [dangling, loopA])
await expect(admit(`unix://${candidate}`)).rejects.toMatchObject({ code: 'ISOLATION_FAILED', message: 'Pinned local Docker socket is unavailable' });
await expect(admit(`unix://${root}/../${path.basename(root)}/docker.sock`)).rejects.toMatchObject({ code: 'ISOLATION_FAILED' });
await expect(admit('tcp://127.0.0.1:2375')).rejects.toMatchObject({ code: 'ISOLATION_FAILED' });
});
});
+3 -1
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@@ -1,6 +1,6 @@
import { afterAll, afterEach, describe, expect, spyOn, test } from 'bun:test';
import * as fs from 'node:fs';import * as os from 'node:os';import * as path from 'node:path';import { spawn, spawnSync } from 'node:child_process';
import { assertSnapshot, capture } from '../lib/cso/snapshot';import { CsoError, snapshotPathHandle } from '../lib/cso/contracts';import { runProcess, sanitizeForJson, sanitizeHelperForJson } from '../lib/cso/process';import { discardAtomicNoReplaceTemp, finalizeReplayTemporary,reclaimDeadAttemptScratch, loadReport, newRun, privateRoot, readJson, recoverAtomicNoReplaceJson, retention, saveReport, secureDirectory, stateRoot, withLock, writeHelperJson, writeJson } from '../lib/cso/state';
import { assertSnapshot, capture, NESTED_REPOSITORY } from '../lib/cso/snapshot';import { CsoError, snapshotPathHandle } from '../lib/cso/contracts';import { runProcess, sanitizeForJson, sanitizeHelperForJson } from '../lib/cso/process';import { discardAtomicNoReplaceTemp, finalizeReplayTemporary,reclaimDeadAttemptScratch, loadReport, newRun, privateRoot, readJson, recoverAtomicNoReplaceJson, retention, saveReport, secureDirectory, stateRoot, withLock, writeHelperJson, writeJson } from '../lib/cso/state';
const roots:string[]=[];const tmp=()=>{const p=fs.mkdtempSync(path.join(os.tmpdir(),'cso-snapshot-'));roots.push(p);return p;};afterEach(()=>{for(const p of roots.splice(0))fs.rmSync(p,{recursive:true,force:true});});
const originalState=process.env.GSTACK_HOME,state=fs.mkdtempSync(path.join(os.tmpdir(),'cso-state-'));process.env.GSTACK_HOME=state;afterAll(()=>{if(originalState===undefined)delete process.env.GSTACK_HOME;else process.env.GSTACK_HOME=originalState;fs.rmSync(state,{recursive:true,force:true});});
function git(repo:string,...args:string[]){const r=spawnSync('/usr/bin/git',['-C',repo,...args],{encoding:'utf8',env:{PATH:'/usr/bin:/bin',HOME:repo},timeout:30_000});if(r.status)throw new Error(r.stderr);return r.stdout;}
@@ -19,6 +19,8 @@ const unlink=fs.unlinkSync.bind(fs);spyOn(fsModule,'unlinkSync').mockImplementat
const {withLock}=await import(${JSON.stringify(path.resolve(import.meta.dir,'../lib/cso/state.ts'))});let outcome='success';try{withLock(dir,()=>{const active=path.join(barrier,'work-active');try{write(active,id,{flag:'wx'});}catch{fs.appendFileSync(path.join(barrier,'overlap'),'overlap\\n');}mark('entered-'+id);if(process.env.RACE_HOLD==='1')waitFor('release-'+id);try{if(fs.readFileSync(active,'utf8')===id)fs.unlinkSync(active);}catch{}});}catch(error){outcome=String(error?.code??error);}write(path.join(barrier,'result-'+id),outcome);`;}
describe('CSO dirty snapshot boundary',()=>{
test('captures tracked modifications and nonignored untracked source without changing Git state',async()=>{const p=repo();fs.writeFileSync(path.join(p,'tracked.txt'),'dirty\n');fs.writeFileSync(path.join(p,'new.txt'),'untracked\n');fs.writeFileSync(path.join(p,'.gitignore'),'ignored.txt\n');fs.writeFileSync(path.join(p,'ignored.txt'),'ignored\n');const before=git(p,'status','--porcelain=v1','-z'),run=newRun(p),m=await capture(p,run.dir,'HEAD');expect(fs.readFileSync(path.join(run.dir,'snapshot','tracked.txt'),'utf8')).toBe('dirty\n');expect(fs.readFileSync(path.join(run.dir,'snapshot','new.txt'),'utf8')).toBe('untracked\n');expect(fs.existsSync(path.join(run.dir,'snapshot','ignored.txt'))).toBe(false);expect(git(p,'status','--porcelain=v1','-z')).toBe(before);expect(m.changedPaths).toContain('new.txt');});
test('records an untracked nested repository as one boundary entry instead of failing the run',async()=>{const p=repo(),inner=path.join(p,'inner');fs.mkdirSync(inner);git(inner,'init','-q');git(inner,'config','user.email','fixture@example.test');git(inner,'config','user.name','Fixture');fs.writeFileSync(path.join(inner,'f.txt'),'x\n');git(inner,'add','.');git(inner,'commit','-qm','inner');const run=newRun(p),manifest=await capture(p,run.dir,'HEAD');assertSnapshot(run.dir,manifest);const entry=manifest.entries.find(e=>e.path==='inner');expect(entry?.transformation).toBe(NESTED_REPOSITORY);expect(entry?.originalHash).toBe('not-read');expect(manifest.entries.map(e=>e.path).filter(p=>p==='tracked.txt'||p.startsWith('inner'))).toEqual(['inner','tracked.txt']);expect(manifest.changedPaths).toContain('inner');expect(fs.existsSync(path.join(run.dir,'snapshot','inner'))).toBe(false);expect(fs.existsSync(path.join(run.dir,'readable','inner'))).toBe(false);});
test('records a registered submodule gitlink the same way as an untracked nested repository',async()=>{const p=repo(),src=tmp();git(src,'init','-q');git(src,'config','user.email','fixture@example.test');git(src,'config','user.name','Fixture');fs.writeFileSync(path.join(src,'g.txt'),'g\n');git(src,'add','.');git(src,'commit','-qm','sub');git(p,'-c','protocol.file.allow=always','submodule','add','-q',src,'sub');const run=newRun(p),manifest=await capture(p,run.dir,'HEAD');assertSnapshot(run.dir,manifest);expect(manifest.entries.find(e=>e.path==='sub')?.transformation).toBe(NESTED_REPOSITORY);expect(fs.existsSync(path.join(run.dir,'snapshot','sub','g.txt'))).toBe(false);});
test('admits source membership and time before an unbounded startup walk',async()=>{const p=repo();fs.writeFileSync(path.join(p,'second.txt'),'second\n');const tooMany=newRun(p);await expect(capture(p,tooMany.dir,undefined,undefined,{maxEntries:1})).rejects.toMatchObject({code:'MISSING_INPUT'});expect(fs.existsSync(path.join(tooMany.dir,'snapshot'))).toBe(false);const expired=newRun(p);await expect(capture(p,expired.dir,undefined,undefined,{deadlineMs:Date.now()-1})).rejects.toMatchObject({code:'DEADLINE'});expect(fs.existsSync(path.join(expired.dir,'snapshot'))).toBe(false);});
test('includes chmod-only changes in diff scope',async()=>{const p=repo();fs.chmodSync(path.join(p,'tracked.txt'),0o755);const manifest=await capture(p,newRun(p).dir,'HEAD');expect(manifest.changedPaths).toContain('tracked.txt');});
test('does not invoke configured clean filters, hooks, fsmonitor, or PATH shims',async()=>{const p=repo(),marker=path.join(p,'marker');fs.writeFileSync(path.join(p,'.gitattributes'),'*.txt filter=hostile\n');git(p,'config','filter.hostile.clean',`/bin/sh -c 'touch ${marker}; cat'`);git(p,'config','core.fsmonitor',`/bin/sh -c 'touch ${marker}'`);const fake=path.join(p,'bin');fs.mkdirSync(fake);fs.writeFileSync(path.join(fake,'git'),`#!/bin/sh\ntouch '${marker}'\nexit 99\n`,{mode:0o755});const old=process.env.PATH;process.env.PATH=`${fake}:${old}`;try{await capture(p,newRun(p).dir,'HEAD');}finally{process.env.PATH=old;}expect(fs.existsSync(marker)).toBe(false);});