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`source.path.name().dir` is empty for `/package.json` (and the drive-relative `C:` for `C:\package.json`). `WorkspaceMap::process_names_array` joined each listed `workspaces` entry onto that directory, and the join dropped the first byte of the entry: `error: Workspace not found "packages/a"`. The workspace root lookup from a member directory and the member lookup for a `$name` override used the same directory. All three now use `bun_paths::dirname`, which keeps the root.
`bun_paths::dirname` adds a trailing separator to a UNC share root, and a workspace root at `//server/share` stopped finding its members. The new `Path::dir_keeping_root` only replaces `name().dir` when it is not an absolute path: `` for `/package.json` and `C:` for `C:\package.json`. `workspace_ref_literal` takes the package.json cache, not the whole package manager, so `bun:internal-for-testing` can run it on a root package.json that is only a path.
With glob entries the lookup found the member without the fix: the member keys were relative to the cwd of the test process, and the join that drops the first byte then dropped a `.`.
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Status Reproduced on canary 1.4.3 (b52d513) and on a debug build of main, in a container with a writable mkdir -p /wsroot-pkgs/a /wsroot-pkgs/b
printf '{"name":"a","version":"1.0.0","dependencies":{"b":"workspace:*"}}' > /wsroot-pkgs/a/package.json
printf '{"name":"b","version":"1.0.0"}' > /wsroot-pkgs/b/package.json
printf '{"name":"fsroot","workspaces":["wsroot-pkgs/a","wsroot-pkgs/b"]}' > /package.json
cd / && bun install --ignore-scripts
# error: Workspace not found "wsroot-pkgs/a"The automated test cannot write to CI (build 118213, head 47a883d): the diff is green.
The other failures passed on a retry. The PR is ready for a maintainer. PR: #43404 |
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In `@test/cli/install/bad-workspace.test.ts`:
- Line 214: Replace the parameterized test introduced by test.each with
describe.each for the workspace-entry cases, moving the test body inside each
generated suite while preserving the existing cases and assertions.
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src/install/PackageManager.rssrc/install/lockfile/OverrideMap.rssrc/install/lockfile/Package/WorkspaceMap.rssrc/install_jsc/install_binding.rssrc/js/internal-for-testing.tssrc/paths/lib.rstest/cli/install/bad-workspace.test.ts
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The loop in `PackageManager::init` that matches the cwd against the members of a package.json above it moves into `WorkspaceMap::member_in`, so that `bun:internal-for-testing` can run it with a root package.json in the filesystem root.
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Updated 1:50 AM PT - Sep 19th, 2026
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I re-reviewed the revision after 3656fc1 (the member_in extraction and its workspaceMemberIn test, which covers the member-directory lookup I asked about earlier) and found no bugs; a human look is still worthwhile because the fix changes path semantics in workspace resolution and includes #[cfg(windows)] code that is not type-checked on this Linux checkout.
What was reviewed:
member_inagainst the loop it replaces inPackageManager::init: same first-match iteration, same absolute-key/relative-path branch, same posix conversion on Windows;parent_path_bufis still used above for the root package.json path, so nothing is left dangling.dir_keeping_root/package_json_dir: traced/package.json(dir""->/),C:/package.json(dirC:->C:/), a relativepackage.json(falls back totop_level_dir), and a normal absolute dir (unchanged bytes), including the glob-walker cwd which previously useddirname(source.path.text)with the same fallback.- The
bun:internal-for-testingbindings: argument count matchescreate_empty_object(global, 4), strings go throughto_utf8/create_utf8_for_js, errors surface throughLog::to_js;workspace_ref_for_testing'sunwrap_or_default()only affects the test helper (a lookup error reads asnull, which thetoBe("1.0.0")assertion would catch).
Extended reasoning...
Overview
The PR fixes workspace resolution when the root package.json sits in a filesystem root (/package.json, C:\package.json), where PathName::dir is empty or drive-relative. It adds Path::dir_keeping_root() in src/paths/lib.rs, a package_json_dir() helper in src/install/lockfile/Package/WorkspaceMap.rs that also falls back to top_level_dir, switches the path branch, the glob-walker cwd, the root-skip compare, and workspace_dir_of to it, extracts the member-directory lookup from PackageManager::init into WorkspaceMap::member_in, narrows workspace_ref_literal to take the package.json cache, and exposes three test-only entry points through bun:internal-for-testing (src/install_jsc/install_binding.rs, src/js/internal-for-testing.ts). test/cli/install/bad-workspace.test.ts gains a describe.each over a filesystem-root and a directory root, covering path, glob, and .. entries, the member-in lookup, and $name override refs, plus a Windows-only C:/ spelling.
Security risks
None identified. The change is confined to the package manager's workspace-path resolution and test-only host functions. The new bindings take strings from JS via to_utf8 and pass them to the same parser and filesystem lookups bun install already performs; they are gated behind bun:internal-for-testing. No credentials, network, or archive-extraction paths are involved.
Level of scrutiny
Moderate. The fix is small in mechanism but sits in path handling that differs across POSIX, Windows drive roots, and UNC roots, and two #[cfg(windows)] blocks (member_in and the seek in PackageManager::init) cannot be type-checked here. The member_in extraction is a faithful refactor of the previous loop (first-match, absolute-key branch, posix conversion into a pooled buffer), and the root-skip compare change from eql_long(dirname(...), root_dir) to workspace_dir_of(...) == root_dir is byte-equivalent on POSIX. I traced dir_keeping_root through PathName::init and dirname_windows for the root, drive-root, relative, and ordinary absolute cases and each yields the intended directory. A debug build was not available in this checkout, so the new tests were not executed in this run.
Other factors
The commit after my prior review added member_in and a workspaceMemberIn test, which exercises the exact logic that the PackageManager::init walk now calls, addressing the earlier gap where that path had only manual coverage. The remaining previously noted items (the Windows C:\ vs C:/ root-skip compare and EACCES on broad globs at /) are pre-existing behavior the PR text explicitly scopes out, so they are not restated. The bug hunt exited on dry_streak with no findings. Given the cross-platform path semantics and unverifiable Windows-gated code, a maintainer look is the appropriate next step rather than an automated approval.
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Problem
/,bun installfails for a member thatworkspaceslists by path:error: Workspace not found "packages/a". A glob entry works. Found by inspection (install: reject workspace members outside the workspace root #41764), no user report.source.path.name().dirinWorkspaceMap::process_names_array(src/install/lockfile/Package/WorkspaceMap.rs:272). It is empty for/package.json. The join onto an empty directory drops the first byte of the entry, so bun reads/ackages/a/package.json.PackageManager.rs:1800) and the member lookup of a$nameoverride (OverrideMap.rs:1223).Fix
Path::dir_keeping_root()(new,src/paths/lib.rs) returnsname().dirwhen that is absolute, so such a directory keeps its bytes (UNC share roots too). If not, it returnsbun_paths::dirname(text):/, orC:\forC:\package.json. The three places and the glob branch use it.test/cli/install/bad-workspace.test.ts. A test cannot write to/, so threebun:internal-for-testinghelpers run the three lookups on a root package.json that is only a path.C:\now works from a member directory.bun installwith the cwdC:\still fails withENOENT(Bun completely fails when working with drive root #29273), a separate bug.Background
process_names_arrayresolves eachworkspacesentry (a path or a glob) to member directories, keyed by path from the workspace root.PathNameis the parsed view (dir, base, ext) of a path. Itsdirhas no trailing separator: empty for/package.json, the drive-relativeC:forC:\package.json.join_abs_string_bufexpects an absolute cwd. With an empty one it writes/over the first byte of the parts.Notes
Age and reach
processWorkspaceNamesArrayalready joined entries ontosource.path.name.dirin bun v1.0.0 (src/install/lockfile.zig). The bug is not a regression.PathName.dir, after user reports from images that keep files in/. [BUG] 10.5.2 regresses running scripts from workspaces in certain Dockerfiles with errorNo workspaces foundnpm/cli#7413 and [BUG] #7495 Partially fixes #7413, but running scripts for workspaces in the / directoy is still broken. npm/cli#7563 are npm users with a workspace project in/. This PR makes no claim about what npm does there.Repro (Linux, needs a writable
/, so use a throwaway container)Results by hand, canary 1.4.3 (b52d513) against the debug build of this branch:
cd / && bun installerror: Workspace not found "wsroot-pkgs/a"(andb)Checked 4 installs across 3 packages, both members inbun.lockcd /wsroot-pkgs/a && bun installerror: Workspace dependency "b" not found,Searched in "./*",error: b@workspace:* failed to resolve/bun.lockis saved"overrides":{"b":"$b"}warn: Could not resolve "$b": "b" is not in dependencies"overrides": { "b": "workspace:*" }inbun.lockThe install from a member directory fails before the fix because
process_names_arrayruns during the walk to the workspace root. At that timetop_level_diris still the member directory. An emptyroot_dirmakesrelative_platform_bufresolve againsttop_level_dir, so the member keys are""and../b, and no key matches the cwd.The tests
install_test_helpers.workspaceMembers(packageJsonPath, packageJson),workspaceMemberIn(packageJsonPath, packageJson, dir)andworkspaceRef(packageJsonPath, packageJson, name)take the text of the root package.json as an argument. They read only the members from disk. The test puts the root atparse(tmpdir).rootand names the members by their path from that root.InstallFailed(oneWorkspace not foundper entry), and glob members get the keys../../tmp/..., relative to the cwd of the test process. With only theOverrideMap.rsline reverted, the$namecase alone fails (Expected: "1.0.0",Received: null).workspace_ref_literalnow takes the package.json cache and not the wholePackageManager. It used nothing else, and the helper can call it without a manager.PackageManager::initthat matches the cwd against the members of a package.json above it is nowWorkspaceMap::member_in, so thatworkspaceMemberIncan run it. With only the directory insidemember_inreverted toname().dir, the new case fails for the filesystem root. A test with a real/package.jsonis not safe: CI runs test files in parallel on one machine, and almost every bun command looks for a package.json up to/.Why
dir_keeping_rootkeepsname().dirwhen it is absolutebun_paths::dirnamefor every path. On Windowsdirnamereturns a UNC share root with its trailing separator (//server/share/). With the/separators thatbun installuses for the root package.json, a workspace root at//localhost/c$/package.jsonthen found no members (Workspace not foundfor path entries, no match for globs). Main handles that root correctly, and so does this revision (probe on a Windows x64 debug build, share root and directory in a share, both separators, path and glob entries: 8 of 8).Windows
panic: assertion failed: crate::is_absolute_windows(cwd)injoin_abs_string_buf_windows, becauseroot_dirisC:. A release build passes thatC:on, and the join happens to produceC:\.... With the fixbad-workspace.test.tspasses on a Windows x64 debug build: 21 pass, 4 skip (POSIX-only on main), 0 fail. One new Windows-only case spells the drive rootC:/, the waybun installreads the root package.json.C:\package.jsonas the workspace root,bun installfromC:\wsroot-pkgs\afails on canary 367d939 witherror: Workspace dependency "b" not found. With the fix it installs, for listed and for glob entries, and the$boverride resolves.bun installwith the cwdC:\itself fails withENOENT: Bun could not find a file, and the code that produces this error is missing a better error.before and after this PR, also for a package.json with noworkspaces. That is Bun completely fails when working with drive root #29273 (closed by the duplicate bot against Error running on ramdisk in Windows system #26192). It is a different bug and has its own follow-up.Package::parsereceives uses/separators, and a joined member path uses\. The byte compare that skips an entry which names the root never matches there. install: fail to resolve an empty workspace: spec, and never make the root its own workspace member #41653 replaces that compare withis_root_package_json, so this PR leaves it a byte compare.What this PR does not change
PathName::inititself. The bundler, the resolver and the transpiler share it, and about 40 places read.dir. For a module in/,import.meta.dirand__dirnameare""andimport "./sibling"resolves against the cwd. That has its own follow-up.dir_keeping_root()is there for those places to use.resolve_path::dirname::<Auto>returnsC:inadd_remove_with_filter.rs:364andfilter_arg.rs:182. Resolve relative and empty directory variables against the working directory instead of the filesystem root #39781 changes whatjoin_abs_string_bufdoes with a base that is not absolute.Package.rs:1859andPackage.rs:1981passsource.path.name().diras a part of a join whose cwd istop_level_dir. The join skips an empty part, and the result is correct for a root at/.Self-review
A review of the first revision raised 9 concerns. All are addressed, none rejected:
dirnamefor every path broke a workspace root at a UNC share root on Windows.dir_keeping_rootkeepsname().dirwhen it is absolute (see above).OverrideMap.rsline had no automated test.workspaceRefand the$namecase cover it.WorkspaceMap.rs. It is nowPath::dir_keeping_root()next tosource_dir().bun installwith the cwdC:\) is in the visible part.PathName::inititself and the Windows drive rootENOENTeach have a follow-up outside this PR.Found in review, not part of this PR
workspacesglob fails withFailed to run workspace pattern ... EACCESwhen the walk meets a directory that the user cannot read. A root at/with a glob such as*meets/rootand/lost+foundthis way. It is not specific to/:"workspaces": ["pkgs/*"]with one unreadablepkgs/secretfails the same way in an ordinary directory on canary b52d513. It has its own follow-up.Open PRs in the same function
is_root_package_jsonfrom install: fail to resolve an empty workspace: spec, and never make the root its own workspace member #41653.workspace_dir_ofkeeps the root in this PR, so that helper also works for a root at/.bun_paths::dirnameand notes thatroot_diris empty at the filesystem root. After this PR it can useroot_dir.Suites on the Linux debug (ASAN) build
The 5 s default timeout is too short for some install tests on this build, so the last three ran with
--timeout 120000.test/cli/install/bad-workspace.test.ts: 24 pass, 1 skip (Windows-only).test/cli/install/bun-workspaces.test.ts: 82 pass.test/cli/install/nested-overrides.test.ts: 144 pass.test/cli/install/bun-add-filter.test.tsandbun-workspaces-self-contained.test.ts: 147 pass, 1 skip.test/cli/install/bun-install.test.ts -t workspace: 40 pass.migration/migrate.test.ts,migration/yarn-lock-migration.test.ts,migration/pnpm-migration.test.ts: 151 pass, 12 todo.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/bad-workspace.test.ts