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WalkthroughThis change adds an internal flag for synchronous manifest-cache writes, centralizes cache-write warnings, enables the flag in the test harness, and expands offline-install tests for asynchronous cache writes and cached manifest reuse. ChangesManifest cache write flow
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Updated 7:03 AM PT - Aug 22nd, 2026
✅ @robobun, your commit 47ef5027e72d0d7b73e074ecc48cf9d991cf1269 passed in 🧪 To try this PR locally: bunx bun-pr 40073That installs a local version of the PR into your bun-40073 --bun |
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Status: ready for review. The fix is a test harness flag; production behavior is unchanged. How the flake was reproduced: the release binary on 16 vCPUs under 48 busy loops, with a fresh project per iteration and a local registry that serves What the PR changes: Earlier shape: a per-file retry loop in the test, replaced after review (details in the PR body). |
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LGTM — test-only de-flake that polls for the on-disk .npm manifest instead of assuming a single online install persisted it.
What was reviewed:
warmCacheis a bounded (≤5) retry loop that awaits the actual observable condition (.npmfile count in the per-test cache dir), with a comment naming why no in-process signal exists (save_asyncis fire-and-forget by design).- Confirmed every former
package_dirinstall site is replaced and the removedbeforeEachbunfig write is dead — all warms now go throughnewProject, which writes its own bunfig; thepackage_dirimport is correctly dropped. - Checked that
urls.length/beforebookkeeping still holds with multiple warm installs, and that the finaltoBe(manifests)equality is safe because each test uses a fresh cache dir with exactly one manifest.
Extended reasoning...
Overview
This PR touches a single test file, test/cli/install/bun-install-offline.test.ts, to fix a CI flake observed on the alpine 3.23 x64 lane. The flake is a known race: Serializer::save_async (src/install/npm.rs) writes the manifest cache entry from a thread-pool task that bun install does not join before exiting, so under load the warm install can exit 0 without the .npm file on disk, and the subsequent --offline install then fails with "no cached manifest". The fix introduces a warmCache(deps, cache) helper that installs from a fresh project (so the manifest is re-fetched and re-written) until the cache directory contains one .npm file per dependency, capped at five attempts, then asserts the count. Six call sites that previously did a single online install into package_dir or a temp project are replaced with warmCache. The now-unused package_dir import and the beforeEach bunfig write to it are removed.
Security risks
None. Test-only change; no production code, no new network endpoints, no external hosts — installs still go to the local dummyRegistry on root_url.
Level of scrutiny
Low. This is a de-flaking refactor of test setup with no changes to what the tests assert about --offline / --prefer-offline behavior. The pattern matches REVIEW.md guidance exactly: poll a bounded window for the real condition rather than sleep-then-check, with a comment naming the missing signal. The PR description cites #39190 as precedent for the same race in bun-lock.test.ts and #37203 for why the fix is intentionally test-side (an install-side wait was tried and reverted). The description also documents empirical probe rates and simulation results showing the old file fails and the new one passes when the lost write is injected.
Other factors
- No assertions are weakened: each replaced block still checks
errdoesn't contain "error:" andcode === 0, plus the new terminalexpect(cachedManifests).toBe(manifests)so the loop cannot silently exhaust without the file. urlsbookkeeping is preserved —beforeis captured afterwarmCachereturns, so extra warm requests don't affect the zero-request assertions that follow.expect(before).toBeGreaterThan(0)in the first test still holds.- Each retry uses a fresh project (no lockfile) so the manifest is genuinely re-fetched; this is why the loop converges. The strict
toBe(manifests)is safe because every warmed test creates its cache dir fresh viamkdtemp()and fetches exactly one package (baz). - The four tests that don't warm a manifest cache (git / tarball-URL / github deps and the git-clone cache test) are untouched.
- Dead code deleted in the same PR that made it dead (the
package_dirbunfig write and import), per repo review rules.
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LGTM — test-only de-flake that polls the actual on-disk condition instead of assuming the async manifest write completed.
What was reviewed:
warmCacheretries from a fresh project (so the manifest is re-fetched each attempt) and asserts the final.npmcount, so 5 misses fails loudly rather than cascading into a confusing downstream failure.- The removed
beforeEachbunfig write topackage_diris dead now that every warm install goes throughnewProject, which writes its own bunfig;package_diris no longer imported or referenced. urls.lengthsnapshots (before) are all taken afterwarmCachereturns, so the extra retry requests don't break the zero-request assertions.- The warm install always uses the hoisted linker regardless of the test's linker matrix — fine, since it only exists to populate the shared cache dir.
Extended reasoning...
Overview
This PR de-flakes test/cli/install/bun-install-offline.test.ts by replacing each single online "warm the cache" install with a warmCache helper that re-installs from a fresh project (up to 5 times) until the expected number of .npm manifest entries are on disk, then asserts the count. The root cause is documented: Serializer::save_async writes the manifest cache entry from a thread-pool task that bun install does not join before exit, so under CI load the process can exit before the rename lands. The PR also removes the now-dead beforeEach override of package_dir's bunfig and the package_dir import, since all warm installs now go through newProject (which creates its own temp dir + bunfig).
Security risks
None. Test-only change; no production code, no new inputs, no network beyond the existing local dummy registry.
Level of scrutiny
Low. This is a targeted flake fix in a single test file, following the exact pattern the repo already accepted in #39190 for the same race in bun-lock.test.ts. It obeys the repo's testing rules: it polls the observable condition (files on disk) with a bounded loop rather than sleeping, and the loop's failure mode is an explicit expect(...).toBe(manifests) rather than a silent pass. The PR description includes probe data (5/3000 cold, 746/3000 warm-tarball) that justifies both the retry and the fresh-project-per-attempt design, and simulation results showing the old file fails and the new one passes when the write is dropped.
Other factors
- Each retry calls
newProject, so there is no lockfile ornode_modulesto short-circuit the manifest fetch — the retry actually re-triggerssave_async. - The four tests that never warmed a cache (git/tarball-URL/github/git-clone) are untouched.
- The
before = urls.lengthcaptures move to afterwarmCache, so retry requests are correctly excluded from the "no new requests" assertions. - Bounded at 5 attempts; with the measured miss rates the residual flake probability is on the order of 1e-6, and if it does miss all 5 the test fails with a clear
Expected: 1, Received: 0at the assert rather than the misleading--offlineerror downstream.
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Actionable comments posted: 1
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Inline comments:
In `@test/cli/install/bun-install-offline.test.ts`:
- Around line 102-108: Extend the test after the existing manifest assertions to
invoke a fresh bun install with the offline option, assert that the command
succeeds, and verify that no additional registry requests are recorded. Reuse
the test’s existing install, cache, and request-tracking helpers rather than
changing the manifest assertions.
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Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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src/bun_core/env_var.rssrc/install/npm.rstest/cli/install/bun-install-offline.test.tstest/harness.ts
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…efore exit Serializer::save_async writes each manifest cache entry from a thread pool task that bun install never waits for, so under load an install can exit before the entry is on disk. Tests that install again right after a warm install then miss the entry: bun-install-offline.test.ts failed with "--offline: no cached manifest" on one CI lane, and bun-install-registry.test.ts and bun-lock.test.ts carry the same race. Add BUN_INTERNAL_SYNC_MANIFEST_CACHE_WRITES. When it is set, save_async calls Serializer::save inline and returns. The 200 path runs inside the tracked manifest task and the 304 path on the main thread, so the entry is on disk before the install continues. bunEnv in test/harness.ts sets the flag, so every install a test spawns gets it. Production behavior is unchanged when the flag is unset. In bun-install-offline.test.ts, warm the cache through one helper that asserts the entry count, and add a test that spawns an install with the flag unset and holds the tarball response until the thread pool entry exists, so the production write path stays covered.
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I reviewed this PR and didn't find any bugs. The change is well-scoped and follows existing precedent (BUN_INTERNAL_INTERACTIVE_ASSUME_TTY, BUN_DISABLE_SLOW_FILESYSTEM_WARNING), but since it adds a flag to bunEnv that changes manifest-write behavior for every install test in the suite, and the PR body flags a product-level follow-up question about whether bun install should join pending manifest writes at exit, a maintainer look would still be worthwhile.
What was reviewed:
save_asyncsync path callsSerializer::savewith identical args to the async path;warn_not_cachedextraction is byte-identical to the inlined warning it replaces.new_feature_flag!with{}defaults tofalse, so production behavior is unchanged;.get().unwrap_or(false)is consistent with the flag'sOption<bool>return.- The removed
beforeEachbunfig write topackage_diris dead after thewarmCacherefactor — no remaining reference topackage_dirin the file. - The new thread-pool test unsets the flag and polls for the entry with a 10s deadline before releasing the tarball, so the async path stays covered.
Extended reasoning...
Overview
Four files touched: a one-line new_feature_flag! addition in src/bun_core/env_var.rs; a ~20-line change in src/install/npm.rs that adds an env-gated synchronous early-return to Serializer::save_async and extracts the verbose-install warning into a shared warn_not_cached helper; a one-key addition to bunEnv in test/harness.ts; and a refactor of test/cli/install/bun-install-offline.test.ts that consolidates five copies of the same online-install-then-assert setup into a warmCache helper and adds a test that keeps the thread-pool write path exercised with the flag unset.
Security risks
None identified. The new env var is read via the existing atomic feature-flag cache and only selects between two paths that both call the same Serializer::save. No new input parsing, no path handling changes, no network- or auth-facing surface.
Level of scrutiny
Medium. The npm.rs change is production code, but it is gated behind a BUN_INTERNAL_* env var that defaults to false, so end-user behavior is unchanged. The higher-scrutiny piece is the bunEnv addition: every test that spawns bun with bunEnv now writes manifest cache entries synchronously. That should only make tests more deterministic (the PR body reports bun-add, bun-pm, lockfile-only, bun-install-registry -t manifest, and bun-lock all green), and the async path is kept covered by the new dedicated test — but it is a suite-wide behavior change a maintainer should be aware of.
Other factors
All prior reviewer feedback is resolved: the comment-cop long-comment warnings were addressed by shortening to one line each, and the CodeRabbit suggestion to exercise --offline against the async-written entry was implemented in 47ef502. The PR body also explicitly flags a product decision for maintainers (whether bun install should join pending manifest writes at exit now that --offline errors on a miss) — that is out of this PR's scope but is another reason a human should see this change rather than have it land on bot approval alone.
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I checked this branch against the two per-test workarounds it supersedes (#38580 and #39190), with both tests unmodified. Covered: the exit race.
Not covered: a second cause for the bun-lock test on macOS and Windows.
A unique temp name fixes it: a PID or random suffix, as Probe scriptRun with the branch binary: import { mkdirSync, readdirSync, readFileSync, rmSync, writeFileSync } from "fs";
import { join } from "path";
import { tmpdir } from "os";
import { npm_manifest_test_helpers } from "bun:internal-for-testing";
const { parseManifest } = npm_manifest_test_helpers;
const [bin, roundsArg, procsArg, tmpMode] = process.argv.slice(2);
const rounds = Number(roundsArg ?? 20);
const procs = Number(procsArg ?? 4);
const separateTmp = tmpMode === "separate";
const pkgName = "peer-target";
const root = join(tmpdir(), `collide-${process.pid}`);
rmSync(root, { recursive: true, force: true });
mkdirSync(root, { recursive: true });
const sharedTmp = join(root, "shared-tmp");
mkdirSync(sharedTmp, { recursive: true });
const tarball = await new Bun.Archive(
{ "package/package.json": JSON.stringify({ name: pkgName, version: "2.0.1" }) },
{ compress: "gzip" },
).bytes();
let missing = 0, invalid = 0, installFailed = 0;
for (let round = 0; round < rounds; round++) {
let arrived = 0;
const barrier = Promise.withResolvers<void>();
const servers = Array.from({ length: procs }, () =>
Bun.serve({
port: 0,
async fetch(req) {
const { origin, pathname } = new URL(req.url);
if (pathname.endsWith(".tgz")) return new Response(tarball);
if (++arrived === procs) barrier.resolve();
await barrier.promise; // every process saves the manifest at about the same time
return Response.json(
{
name: pkgName,
versions: { "2.0.1": { name: pkgName, version: "2.0.1", dist: { tarball: `${origin}/${pkgName}-2.0.1.tgz` } } },
"dist-tags": { latest: "2.0.1" },
},
{ headers: { "cache-control": "public, max-age=300" } },
);
},
}),
);
const dirs: string[] = [];
const children = servers.map((server, i) => {
const dir = join(root, `r${round}-p${i}`);
mkdirSync(join(dir, ".bun-cache"), { recursive: true });
const ownTmp = join(dir, ".bun-tmp");
if (separateTmp) mkdirSync(ownTmp, { recursive: true });
writeFileSync(join(dir, "package.json"), JSON.stringify({ name: "app", dependencies: { [pkgName]: "2.0.1" } }));
writeFileSync(join(dir, "bunfig.toml"), `[install]\nregistry = "${server.url.href}"\n`);
dirs.push(dir);
const tmp = separateTmp ? ownTmp : sharedTmp;
return Bun.spawn({
cmd: [bin, "install"],
cwd: dir,
env: {
...process.env,
BUN_DEBUG_QUIET_LOGS: "1",
BUN_INTERNAL_SYNC_MANIFEST_CACHE_WRITES: "1",
BUN_INSTALL_CACHE_DIR: join(dir, ".bun-cache"),
BUN_TMPDIR: tmp, TMPDIR: tmp, TEMP: tmp, TMP: tmp,
},
stdout: "pipe",
stderr: "pipe",
});
});
const results = await Promise.all(children.map(async p => ({ code: await p.exited, err: await p.stderr.text() })));
for (const server of servers) server.stop(true);
results.forEach((r, i) => {
if (r.code !== 0) { installFailed++; console.log(`round ${round} proc ${i}: install exited ${r.code}\n${r.err}`); return; }
const cache = join(dirs[i], ".bun-cache");
const entries = readdirSync(cache).filter(n => n.endsWith(".npm"));
if (entries.length === 0) { missing++; console.log(`round ${round} proc ${i}: entry MISSING`); return; }
const path = join(cache, entries[0]);
const text = new TextDecoder("latin1").decode(new Uint8Array(readFileSync(path)));
let parsed: unknown = null, parseError = "";
try { parsed = parseManifest(path, servers[i].url.href); } catch (e: any) { parseError = String(e?.message ?? e); }
if (!text.includes(servers[i].url.href.replace(/\/$/, "")) || !parsed) {
invalid++;
const other = servers.findIndex(s => text.includes(s.url.href.replace(/\/$/, "")));
console.log(`round ${round} proc ${i}: entry INVALID for its registry (holds proc ${other}'s tarball URL, parse: ${parsed ? "ok" : parseError})`);
}
});
}
console.log(`RESULT rounds=${rounds} procs=${procs} tmp=${separateTmp ? "separate" : "shared"}: missing=${missing} invalid=${invalid} installFailed=${installFailed} of ${rounds * procs} installs`);
rmSync(root, { recursive: true, force: true });Output on Windows (debug build of this branch): Output on Linux (release build of this branch): |
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The temporary file name collision in |
### Problem - `test/cli/install/bun-lock.test.ts` > "peer no published version satisfies" > "declared by a registry package" (from #38851) fails on main about every fourth build (build 104990). `expect(registry.requests).toEqual([])` at bun-lock.test.ts:1778 receives `["/peer-target"]`: the manifest cache has no usable entry for `peer-target`. It has two causes. #40073 covers the first, the `save_async` exit race. This PR fixes the second. - `Serializer::save` (src/install/npm.rs:1352) named the temporary file `<name hash>.npm-<milliseconds>` in the temporary directory every bun process shares. The four concurrent peer tests all save `peer-target`, and two saves in one millisecond opened one file. Windows, release build, four installs saving one package at once: 77 of 80 lost their entry. Linux uses `O_TMPFILE` today; #38916 starts using the name on Linux too, so this fix has to land first. ### Fix - `Serializer::save` names the file with `FileSystem::tmpname`, as `TarballStream` already does. Correct because the name no longer depends on anything two processes share. - Two tests in `bun-install-registry.test.ts`: four synchronized installs keep their own valid entries, and an install still caches its manifest when directories occupy the old temporary names. The second fails 3 of 3 on Windows without the fix and passes 5 of 5 with it. The test registry serves the tarball only after the cache entry exists, so neither test depends on the exit race. - Verified: `bun bd test test/cli/install/bun-install-registry.test.ts` (250 pass) on Linux, both new tests on Windows. ### Background - Manifest cache: each fetched manifest is serialized to `<cache dir>/<name hash>-<registry hash>.npm`. Within the response's `max-age`, a later install resolves from that file and makes no request. - `write_file` opens the temporary file with `O_CREAT | O_TRUNC`, writes, then renames it into the cache. Two processes on one name write one file. On macOS the second rename fails and the first cache holds the second's bytes, which `load_by_file` rejects. On Windows `rename_at_w` moves by handle, so the second rename moves the file out of the first cache again. - The exit race: `save_async` writes the entry from a thread pool task that `bun install` does not wait for, by design (#37203). The test change in #39190 works around it for the bun-lock test. The harness flag in #40073 removes it from every install test. <details><summary>Notes</summary> Probe (Windows, 16 vCPUs): one registry and one project per install, `dependencies: { "peer-target": "2.0.1" }`, each registry holds its manifest response until all four have been asked, then all respond at once. After exit, the `.npm` entry is read and checked for the install's own registry origin. | binary | temp dir | rounds | ok | missing | wrong registry | | --- | --- | --- | --- | --- | --- | | 1.4.1-canary.1 (release, unfixed) | shared `%TEMP%` | 20 | 3 | 60 | 17 | | 1.4.1-canary.1 (release, unfixed) | shared, responses not synchronized | 40 | 135 | 17 | 8 | | 1.4.1-canary.1 (release, unfixed) | one per install | 40 | 160 | 0 | 0 | | debug, unfixed | shared | 20 | 74 | 3 | 3 | | debug, this branch | shared | 20 | 80 | 0 | 0 | The unfixed debug build loses far fewer entries than the release build because its slower parse spreads the four saves over several milliseconds. That is also why the concurrent test detects the bug almost always on release lanes and only sometimes on a debug build. The directory test fails deterministically on a debug build (3 of 3 and, in an earlier shape of the test, 5 of 5 on Windows). Windows mechanism in detail: `open_file_at_windows` maps `O_CREAT | O_TRUNC` to `FILE_OVERWRITE_IF` with `FILE_SHARE_READ | WRITE | DELETE`, so every process opens and truncates the same file. `rename_at_w` (src/sys/windows/mod.rs:1933) opens the source by path and then moves it by handle. When two processes have opened the path before either moves it, both moves succeed: the second one relocates the file out of the first process's cache. That process sees a successful save and has no entry, which is the "no entry, no error" case in the probe. `FileSystem::tmpname` (src/resolver/lib.rs:198) formats `.<random ^ nanoseconds>-<counter>.<ext>`. The temporary directory probe in `PackageManagerDirectories.rs` and `TarballStream::open_destination` use it the same way. Test registry and the exit race: both new tests read the cache after the install exits. To keep them independent of the `save_async` exit race, the registry answers the tarball request only once a `.npm` entry exists in the project's cache (polling with a 5 second deadline, after which it answers anyway so a lost write ends as a failed assertion instead of a hang). The tarball is requested after the manifest is parsed, so the install cannot finish before its entry is on disk. Sequencing: #38916 changes the Linux `O_TMPFILE` path to link the file into the temporary directory under `tmp_path` before renaming it over an existing entry, which makes the name load-bearing on Linux. This PR should land before it. #39190 (the bun-lock warm-up loop) and #40073 (harness flag) handle the exit race; an earlier shape of this PR carried #39190's commit, which the self-review flagged as a duplicate of an open PR, so it was dropped. Gate: the fixed code path is not reachable on Linux today (`O_TMPFILE`), so the new tests pass on Linux with and without the fix. The fail-before proof is the Windows run above. Also run: `cargo clippy -p bun_install`, clean. </details> <!-- robobun:evidence:begin --> --- **no test proof** · iteration 0 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/cli/install/bun-install-registry.test.ts, test/cli/install/bun-lock.test.ts <!-- robobun:evidence:end -->
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Problem
test/cli/install/bun-install-offline.test.ts(from install: add --offline and --prefer-offline to bun install #40010) flaked on the alpine 3.23 x64 lane of build 103389:error: --offline: no cached manifest for "baz" (run once online, or use --prefer-offline)at line 114.Serializer::save_async(src/install/npm.rs:1250) writes each manifest cache entry from a thread pool task thatbun installnever waits for, so under load an install exits first. test(security-scanner-matrix): don't depend on the setup install's manifest cache writes having landed #37203, test(install): don't require the refetched manifest to be cached before install exits #38580 and test(install): establish the warm manifest cache before the unmet peer test re-resolves #39190 each patched one test around it.Fix
BUN_INTERNAL_SYNC_MANIFEST_CACHE_WRITES, makessave_asyncwrite the entry inline: inside the tracked manifest task (200) or on the main thread (304), so it is on disk before the install goes on.bunEnvsets it for every install a test spawns.BUN_DISABLE_SLOW_FILESYSTEM_WARNING, and it keeps the test(security-scanner-matrix): don't depend on the setup install's manifest cache writes having landed #37203 decision: no exit-time wait inbun install.warmCachehelper. A new test installs with the flag unset and holds the tarball response until the thread pool entry exists, so the production path stays covered.bun bd test test/cli/install/bun-install-offline.test.ts(11 pass),bun-install-registry -t manifestand thebun-lockpeer tests. Probe, one debug binary under load: flag unset loses 24 of 300 entries, flag set 0 of 150.Background
bun installserializes each fetched manifest to<cache dir>/<hash>.npm.--offlineresolves from that file only and reports a miss as an error.save_asyncwrites a temporary file and renames it into the cache directory from a thread pool task. The cache is optional, so nothing joins the task before exit.src/bun_core/env_var.rs) are env vars cached atomically, safe to read from a pool worker.Notes
Probes. Each iteration: a fresh project against a local registry that serves
baz, thenbun install, then count.npmfiles in the cache directory after exit 0. 16 vCPUs, 48 busy loops alongside.Release binary (1.4.0-canary.1, no flag support, unfixed):
Debug binary from this branch, tarball already cached, 20,000-version manifest so the write takes longer:
BUN_INTERNAL_SYNC_MANIFEST_CACHE_WRITES=1No install failed in any run. Also run:
bun-add,bun-pmandlockfile-only, all green.Why both callers are covered:
get_package_metadata(npm.rs:581) runs insidePackageManagerTaskon a pool worker, and the main thread waits for that task, so an inline save there finishes before the task is marked done. The 304 path (runTasks.rs:674) is on the main thread.Test proof: there is no build on which the unmodified tests fail deterministically. Without the flag the entry is usually on disk (the race needs load), and a test cannot observe the moment the install moves on precisely enough from outside the process (tried: a registry handler that checks for the entry when the tarball is requested; under the debug test runner the handler runs late and sees the entry 7 of 8 times). The probe above is the evidence.
Earlier shape of this PR: a per-file
warmCacheloop that reinstalled until the entry appeared, the same shape as #39190. A review pointed out that it was the fifth per-test patch around one root cause and that a harness flag with existing precedent covers all of them, so the loop was replaced with the flag. With the flag inbunEnv, #39190 and #38580 are no longer needed.Follow-up for maintainers, not part of this PR: #37203 kept the write fire-and-forget because a missing entry only meant a refetch. Since #40010,
bun install --offlinereports a missing entry as an error after a successful online install, so a user can hit this race on a loaded machine. Whetherbun installshould join pending manifest writes at exit is a product decision.[review] gate passed · iteration 0 · 4 files touched
fails on main (without fix)
passes on PR (with fix)
diff hotspot
gate history · 1 passed · 0 rejected · iteration 0
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