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Every bunx pkg@latest run spawned bun add pkg@latest --no-cache --force. The --force flag re-installs every package in the cached tree on each invocation. That re-link is cheap on macOS and Linux but slow on Windows, where it does per-file work and antivirus software scans each file. Only --no-cache is needed for a dist-tag. It re-fetches the manifest, and bun add pkg@tag re-installs the package when the tag moved. Keep --force for the two paths that must refresh or replace an existing tree: a stale cache (older than 24 hours) and an untrusted cached binary. Fixes #41211
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Walkthrough
Changesbunx cache refresh
Suggested reviewers: Priority: ➖ Normal Severity of issue fixed: Medium Merge Risk: 🔵 Low · up to A failed shim removal can leave bunx using a stale executable instead of retrying installation on Windows. This is a narrow cache-recovery case; report removal failures so the fallback does not proceed as if cleanup succeeded. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Updated 5:27 AM PT - Sep 30th, 2026
❌ @robobun, your commit 375552d has 1 failures in
🧪 To try this PR locally: bunx bun-pr 41226That installs a local version of the PR into your bun-41226 --bun |
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LGTM — small, well-scoped split of one flag into two, with tests pinning both the new fast path and the preserved correctness.
What was reviewed:
force_reinstallis set alongsidedo_cache_bustat all three tree-replacement sites (untrusted×2, stale), so--forceis only dropped on the plain dist-tag path wherelook_for_existing_binis false and none of those sites run.BoundedArray<&[u8], 8>still holds the worst case (4 base +--no-cache+--force+--verbose+--silent); everyforce_reinstall = truealso setsdo_cache_bust = true, so the arg count is unchanged.- Tests: marker-survives proves
--forceis gone on warm@ latest;utimesSync-aged stale test proves--forceis kept; moved-tag test proves #4981 stays fixed with--no-cachealone.tar -czfviaBun.$matches the siblingbun-install-git-deps.test.tspattern.
Extended reasoning...
Overview
The PR touches two files: src/runtime/cli/bunx_command.rs (net +10/-1) and test/cli/install/bunx.test.ts (+140). The Rust change introduces a force_reinstall: bool alongside the existing do_cache_bust, sets it at the three sites that already set do_cache_bust = true inside the 'try_run_existing block (untrusted cached binary on both probes, and the >24h stale check), and splits the single if do_cache_bust { --no-cache; --force } into two independent if blocks. The net effect: a plain bunx pkg@<dist-tag> run — where look_for_existing_bin is false and the block that sets force_reinstall never executes — now spawns bun add pkg@ tag --no-cache without --force, while every path that previously replaced a cached tree still passes --force.
Security risks
None introduced. The two security-relevant paths (is_trusted_cached_binary failures) still set both do_cache_bust and force_reinstall, so an untrusted cached tree is still force-replaced exactly as before. No new inputs are parsed, no new filesystem paths are derived from untrusted data, and the BoundedArray capacity invariant is unchanged. The tests use the local dummyRegistry fixture and locally-built tarballs — no external network.
Level of scrutiny
Low-to-moderate. The Rust diff is a mechanical flag split with no new control flow; correctness reduces to "is --no-cache alone sufficient to pick up a moved dist-tag?" — which the third new test proves against a registry whose latest tag flips between runs. I traced that look_for_existing_bin = literal.is_empty() || tag != DistTag is false for pkg@ latest, so the dist-tag path never enters the block that could set force_reinstall, confirming the intended behavior change is scoped exactly to that case. The .expect("unreachable") on BoundedArray::append is still bounded at 8 (4 base args + up to 4 optional flags).
Other factors
The three new tests are well-designed: the planted-marker approach is a direct observable for --force (fails on unfixed bun per the PR description, satisfying the USE_SYSTEM_BUN=1 rule), the stale test uses utimesSync to backdate mtimes rather than sleeping (no time-based waits), and stderr/stdout are asserted before exit code per test/CLAUDE.md. tmpdirSync and tar -czf match existing patterns in this file and its sibling bun-install-git-deps.test.ts. No CODEOWNERS cover these paths. The three self-resolved bot inline threads correspond to the comment-trimming commits (60be45e, ef51d40) and appear addressed. No human CHANGES_REQUESTED reviews are outstanding.
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Status of the gap that this comment first reported from a read of the code. Reproduced. On Linux, with a local registry and a package
main runs the tool, because Closed in this PR. When the first install leaves no bin, bunx installs once more with
Windows. At ead653c the test Still open, for a maintainer. A missing or replaced file of a dependency is not repaired when the bin is intact. main repaired it on the next dist-tag run as a side effect of The alternative on branch |
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@robobun can you get this merged in? |
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I cannot merge. A maintainer has to review and merge this PR. Current state: the change is ready. The new tests pass on Linux and Windows, and both bot reviews found no issues. The only CI failures are on unrelated tests that pass on retry, so nothing blocks a review. |
…-dist-tag-no-force
… from its .bin entry A tree older than 24 hours asks the registry again and is not re-linked. The age of a tree is the age of its .bin entry (lstat), which every install renews. The stat through the link read the hardlinked install cache file, whose mtime no install renews, so each run after the first day was a forced install. The failure message names the directory to remove.
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Actionable comments posted: 2
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Inline comments:
Review comments at @src/runtime/cli/bunx_command.rs:
- Line 1349: Update the executable-resolution flow in `bunx_command` to retry
installation once with `--force` when the post-install lookup cannot find the
executable, including when `force_reinstall` is false. Keep the retry bounded to
one attempt, then report the existing resolution error if the executable is
still missing.
Review comments at @test/cli/install/bunx.test.ts:
- Around line 878-883: Replace the tmpdirSync call and manual mkdir/writeFile
loop in the package fixture setup with tempDirWithFiles. Import tempDirWithFiles
from harness and pass it the package files, including the generated
package.json.
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Beyond the inline findings, I also checked the >24h stale-tree path now that it no longer passes --force: the spawned bun add still re-creates every .bin symlink for skipped packages (bin.rs create_symlink deletes on EEXIST and links again), so the lstat mtime is renewed and the tree reads as fresh on the next run, as the new stale test asserts. Note the PR description still says --force is kept for trees older than 24 hours; at HEAD force_reinstall is set only on the two untrusted-tree breaks, so the description is out of date relative to the code and tests.
Extended reasoning...
The change touches src/runtime/cli/bunx_command.rs (splitting do_cache_bust into --no-cache vs a new force_reinstall gate for --force, switching the POSIX staleness check to lstat on the .bin entry, and adding a note on the executable-not-found exit) plus a new "bunx cache" describe block in test/cli/install/bunx.test.ts backed by an in-process Bun.serve registry. No security-sensitive surface is touched. The confirmed inline finding about damaged trees no longer self-repairing on dist-tag runs, the hunt being cut off at max_bugs, and the description/code mismatch on the stale path are why a human should decide rather than an approval.
Findings marked 🟡 are optional suggestions and need no follow-up push.
… bin An install without --force keeps every package whose version already matches. A tree that an interrupted install left without some files therefore stays broken, where the forced install repaired it before. When the bin lookup after the install fails, run the install once more with --force and look again. A healthy warm run still runs one install without --force. The test fixtures live in one disposable temp directory.
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Inline comments:
Review comments at @src/runtime/cli/bunx_command.rs:
- Around line 1597-1601: Update the post-install probe and retry logic in the
`bunx` loop so `NoBinFound` from `get_bin_name_from_temp_directory` skips the
forced reinstall and proceeds to the existing error path. Preserve the `--force`
retry for repairable missing files or untrusted trees, where reinstalling can
restore the executable.
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Code review found no new issues
No new issues were found in this update; 2 findings from earlier reviews are still open above.
Still open from earlier reviews (2):
- 🔴
src/runtime/cli/bunx_command.rs:1510—On Windows a cached tree whose bin target file is missing now fails on every bunx <pkg>@ latest run, and the new retry… - Also unresolved: 1 minor or pre-existing.
If you have decided not to act on one of these findings, resolve its thread (a reply alone leaves it open) and the next review stops counting it. To review this commit again now, use Re-run on its "Claude Code Review" check.
The bin linker skips a bin whose target does not exist. An entry from an earlier install that points at that file stayed behind. On Windows that entry is a shim that exists on its own, so bunx found a bin, ran it, and the shim failed on the missing file. Remove the entry, so a lookup finds no bin and bunx installs once more with --force.
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
Review comments at @src/install/bin.rs:
- Line 907: Update unlink_bin_or_shim to report and propagate shim-removal
errors other than NotFound, and ensure its caller does not mark the bin as
skipped or continue as if removal succeeded when such an error occurs. Preserve
the existing handling of NotFound.
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In a project, a build script can still create the target, and a link that exists already works once it does. The bunx tree has no build step, so there the stale entry only hides the missing file from bunx.
The install bunx spawns reads BUN_INTERNAL_BUNX_INSTALL. The tool ran with the same environment, so an install the tool spawned in the user's project read it too.
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I reviewed the latest push (375552d) and found no bugs; the marker-inheritance issue raised on the previous version is addressed. Because this changes when bunx re-installs and follows a dist-tag, a human look at the tradeoffs is still worthwhile.
What was reviewed:
- Marker scoping:
BUN_INTERNAL_BUNX_INSTALLis snapshotted intoenvp(an owned copy) beforeenv_loader.map.remove, andRun::run_binarybuilds the tool's environment from that map, so the tool and any install it spawns no longer see it; theenv-probetest pins this. - Retry loop: args are rebuilt per pass (4 base + 4 optional fits
BoundedArray<_, 8>),envpis reused as an owned value,MiniEventLoop::init_globalis idempotent on the second pass, and the loop exits after at most two installs or onNoBinFound. lstatstaleness check:Linker::create_symlinkdeletes and re-creates an existing.binlink on EEXIST, so its mtime is renewed by every install as the PR claims.bin.rsstale-entry removal: gated on the feature flag read in the spawnedbun addonly; project installs,bun link, and global installs keep the base behavior.
Extended reasoning...
The change touches src/runtime/cli/bunx_command.rs (install spawn wrapped in a two-pass loop, --force limited to untrusted trees or a first install that left no bin, lstat for the POSIX age check, marker removed from the tool's env), src/install/bin.rs (unlink a dangling .bin entry only under the bunx-install flag), and adds a hermetic bunx cache suite with a local registry. The security-relevant surface is the world-writable bunx cache: the uid trust checks still force a reinstall on an untrusted entry, and the unlink is scoped by the flag to the bunx child. No CODEOWNER covers the changed files and no third-party objection is outstanding (coderabbit threads were resolved by a non-author). Deferring rather than approving because the PR intentionally changes user-visible semantics (bare-name runs on POSIX now follow latest at most once per 24 hours; packages with no runnable bin pay two installs before failing), which a maintainer should ratify.
Fixes #41211, fixes #23597
Problem
bunx <pkg>@latestspawnsbun add <pkg>@latest --no-cache --forceon every run (bunx_command.rs:1341on main).--forcelinks every cached package again. On Windows that costs 30 s or more.bunx <pkg>pays the same on every run after the first day: the age check (bunx_command.rs:1123) reads the hardlinked install cache file, whose mtime no install renews.Fix
--forcein two cases only: the cached binary is not owned by the current user, or a first install without--forceleft no bin to run. Then bunx installs once more with--forceand looks again. A healthy warm run runs one install, without--force..binentry (lstat). Every install creates it again.BUN_INTERNAL_BUNX_INSTALL), the bin linker (src/install/bin.rs) removes an existing.binentry whose target file is gone. On Windows that entry is a shim that runs on its own, so without this the lookup found a bin and the forced install never ran. A project install keeps the entry: a build script can still create its target.--no-cachefetches the manifest again, sobun add <pkg>@<tag>installs the version the tag names (bun createuses the latest locally cached version even when the@latesttag is provided #4981). A tree that an interrupted install left without some files still heals: the second, forced install links every package again.test/cli/install/bunx.test.ts, blockbunx cache(5 tests). Run on Linux against this change and against main.Background
<temp>/bunx-<uid>-<pkg>@<version>. For a dist-tag it spawnsbun addthere on every run.--no-cachedisables the manifest cache.--forcealso installs packages whose version already matches. Without it the installer keeps a package whosepackage.jsonname and version match, even when other files are missing.Downsides
bunx <pkg>on Linux and macOS followslatestonce per 24 hours, not on every run after day one.llvm-size, release, main 2722608). Not measured again for the later commits.Notes
Measured on Linux x64, release builds, hardlink backend, loopback registry. The tree is one tool with 20 dependencies (21 packages, 83 files). The counts are syscalls of the spawned
bun add(ptrace counter). The builds are main 2722608 and 0058284.linkatrenameatunlinkatbunx tool@latestbunx tool@latestbunx tool, tree 25 h old, runs 1 / 2 / 3bunx tool, tree 25 h old, runs 1 / 2 / 3bun x shadcn@latest --help2.2 s vs 1.0 s on Linux. The spawned install in the warm cache dir:--no-cache --force1.61 s,--no-cachealone 0.07 s. The cost is the forced re-link of 252 packages, which Defender amplifies on user machines..binshim, which every install writes again. There a stale bare-name run was one forced install per 24 hours. It is now one plain install per 24 hours.latestfrom 1.0.0 to 1.1.0 and back.bingets one install and the error: a forced install cannot add a bin.bunx_command.rsis whitespace.git diff -wshows the change itself (about 26 lines).is_trusted_cache_root).get_bin_name_from_temp_directory, rootpackage.jsonmtime). For a package whose bin is not named after the package, a bare-name or pinned run still deletes the tree once per 24 hours.BUN_INTERNAL_BUNX_INSTALLfrom the spawned install. On main that variable only changed argv dispatch, so the leak was harmless. Now the bin linker reads it, and an install the tool spawns in the user's project (shadcn runsbun add) must not. A test runs a bin that prints the variable.no test proof · iteration 1 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/cli/install/bunx.test.ts