pm pack: resolve relative --destination and --filename against the invoking directory - #38739
pm pack: resolve relative --destination and --filename against the invoking directory#38739robobun wants to merge 1 commit into
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WalkthroughThe pack and publish commands preserve the original working directory. Explicit relative filenames and destinations resolve from that directory. Default tarball destinations remain workspace-relative. Tests cover path resolution, dry runs, absolute paths, package contents, and PATH_MAX errors. ChangesPack path resolution
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Suggested reviewers: 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Status: fix is up in this PR, rebased onto current main (b58b4cf). Merge after #38704: this PR on its own would break the Reproduced on bun 1.4.0 (release) with the two layouts from the report: # workspace package: tarball lands in the workspace root
cd packages/foo && bun pm pack --filename ./foo.tgz # wrote <root>/foo.tgz
# subdirectory of a package: tarball lands in the package root
cd sub && bun pm pack --destination ./out # wrote <root>/out/packproj-1.0.0.tgz
cd sub && bun pm pack --filename ./out/x.tgz # wrote <root>/out/x.tgz
The error-message and CI: the diff is green on every lane that has run (177 jobs on each of the last three builds, |
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I reviewed this PR and didn't find any bugs. Since it changes user-visible behavior of bun pm pack — both where the tarball lands for relative --destination/--filename and the --quiet output for --filename (now an absolute path instead of the raw flag value) — a maintainer should confirm the behavior change is desired.
What was reviewed:
tarball_destination: verified the checked join leaves room for the trailing NUL and the appended filename, and that the default (no-flag) path still usesabs_workspace_pathsobun publish's pack-then-unlink and existing--quietoutput are unchanged.- The two-placeholder
err_genericcalls now pass a 2-tuple instead of a singleformat_args!, matchingFmtTuple. original_cwdis threaded intopack::Contextfrom bothpm packandpublish; the borrow lives for the duration ofpack()only, which is all it needs.- New tests cover workspace package, subdir with
../, plain-package subdir,--dry-run, absolute values, and the default location; each also asserts the file did NOT land in the wrong directory.
Extended reasoning...
Overview
This PR fixes bun pm pack --destination and --filename to resolve relative paths against the directory the command was invoked from, rather than wherever PackageManager::init chdir'd to (workspace root or package root). It threads the already-available original_cwd from PackageManager::init through PackCommand::exec_with_manager and publish::Context::from_workspace into pack::Context, then uses it as the base for join_abs_string_buf_checked in tarball_destination. Along the way it switches the unchecked join to the checked one (fixing a panic on over-long --destination), and fixes two err_generic calls that were passing a single format_args! to a two-placeholder template.
Security risks
None identified. The change affects only where a tarball is written; both flags are user-supplied on the command line, and join_abs_string_buf_checked is the existing normalized-join helper. Absolute inputs still resolve to themselves. No new file reads, no untrusted input parsing.
Level of scrutiny
Moderate. The logic change is small and well-contained in tarball_destination, but it changes user-visible CLI behavior in two ways: (1) the on-disk location of the tarball for relative flags changes when run from a subdirectory or workspace package, and (2) the --quiet/summary output for --filename becomes an absolute path instead of echoing the raw flag. Both are called out in the PR description, both align with npm's --pack-destination behavior and Bun's own docs, and there is precedent in #38704 for bun publish <tarball>. Still, a change to what a scriptable CLI prints and where it writes files is the kind of thing a maintainer should sign off on rather than an automated approval.
Other factors
The test coverage is good: eight new test.concurrent cases exercise workspace package, subdirectory of a workspace package with ../dist (three distinct candidate directories), subdirectory of a plain package, --dry-run, absolute values, and the default location, each asserting both the correct location and the absence of the tarball in the previously-incorrect locations. The existing --filename and --destination conflict test was strengthened from a bare toThrowError() to asserting the exact (now-fixed) error text. I checked that the NUL-terminator write after the checked join is in-bounds (join_buf_len = dest_buf.len() - 1), that the default branch still bases on abs_workspace_path so the no-flag output stays the bare filename, and that the --filename branch still returns 0 for the dir-prefix length so its parent directory is not auto-created (the existing --filename="out/foo.tgz" test relies on this).
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Updated 5:49 AM PT - Aug 15th, 2026
✅ @robobun, your commit b58b4cfcd64e1cb1ab1df1c633346db2745f9b16 passed in 🧪 To try this PR locally: bunx bun-pr 38739That installs a local version of the PR into your bun-38739 --bun |
### Problem - `bun pm pack --filename=a.tgz --destination=out` prints `error: cannot use both filename and destination at the same time with tarball: filename "a.tgz out" and destination ""`: both values land in the first quoted slot and the second is empty. - The "archive destination name too long" error prints the path with a stray trailing slash (`".../pkg-1.0.0.tgz/"`) for the same reason. - An ignore file that cannot be read prints `EISDIR: failed to read .npmignore /pkg/sub/.npmignore at: ""` instead of `EISDIR: failed to read .npmignore at: "/pkg/sub/.npmignore"`. - Cause: these three sites in `src/runtime/cli/pack_command.rs` (`tarball_destination`, twice, and `IgnorePatterns::ignore_file_fail`) hand `Output::err_generic` / `Output::err` one `format_args!` holding every value, while the template has two (or five) placeholders. A `fmt::Arguments` counts as a single positional (`src/bun_core/output.rs`, `impl FmtTuple for fmt::Arguments`), so placeholder 0 receives everything and `substitute_template` renders the remaining placeholders as nothing. - Unrelated to formatting but in the same function: the `bundledDependencies` entry loop in `pack()` puts `file.handle` into its "failed to stat file" error, so it would read `failed to stat file: "7"` (a file descriptor) instead of naming the file. The entry loop directly above it prints the path. ### Fix - The three sites pass a tuple, as the other multi-argument messages in this file (`edit_root_package_json`) already do. The bundled loop's stat error prints `item.path` like the loop above it. - `substitute_template` now fails a `debug_assert!` when it reaches a placeholder after the arguments have run out. Release builds are unchanged (`debug_assert!`); debug builds, which is what the test suite runs, crash at the offending call site instead of printing a plausible-looking message. - Safe to add: a scan of all 570 `Output::err` / `err_generic` call sites in `src/` (placeholders in the template literal against the arity of the argument) found these three as the only ones with more placeholders than arguments, so the assertion only fires on a new instance. - Checked that it catches this class: rebuilt with only the `output.rs` hunk, and `bun pm pack --filename=a.tgz --destination=out` panics with `template has more placeholders than the 1 arg(s) passed for it: "cannot use both filename and destination ..."`. With the whole change it prints the correct message. - The bundled loop's `fstat` failure cannot be provoked from a test (the file was opened a moment earlier), so that one line is untested. - Verified with `test/cli/install/bun-pack.test.ts`. `--filename and --destination` now asserts the message; new: `--destination with no room left for the tarball name` (POSIX only, it sizes the destination against PATH_MAX, which a Windows command line cannot reach) and `reports which .gitignore/.npmignore could not be read` (a directory where the ignore file is expected, inside a subdirectory so the directory part of the message is exercised; the current release prints the same EISDIR/read message on Windows, so the assertion is not platform-gated). These 4 fail on the current release and pass with this change; the whole file (79 tests) passes with it. - Overlap: #38739 (relative `--destination` / `--filename`) also switches the two `tarball_destination` messages to tuples. Those hunks are identical, so `pack_command.rs` merges cleanly in either order (checked with `git merge-tree`). Both PRs rewrite the `--filename and --destination` test the same way; the one textual conflict is that #38739 adds its tests directly below it. ### Background - `Output::err(name, template, args)` and `Output::err_generic(template, args)` in `src/bun_core/output.rs` take a template string with `{}` placeholders and an `impl FmtTuple`: `()`, a tuple of up to eight `Display` values, or one `fmt::Arguments`. `substitute_template` walks the template at runtime and fills each placeholder with the next entry. The `fmt::Arguments` form exists for the common one-placeholder message (`format_args!("{}", bstr::BStr::new(path))`); it is one entry no matter how many values went into it. - Unlike the `pretty!` family of macros, which expand to `format_args!` and so are checked by the compiler, this path has no compile-time check that the template and the arguments agree. The new assertion is its debug-time equivalent. - `pack()` writes entries in two loops: the package's own files, then the files of its `bundledDependencies`. The second loop opens files through the `Dir` API and so holds a `File` (whose `handle` is the descriptor) rather than a path-carrying error, which is how the descriptor ended up in the message.
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Inline comments:
In `@src/runtime/cli/pack_command.rs`:
- Around line 3034-3038: Update the filename-length error in the pack command
around Output::err_generic to include the concrete recovery action: instruct the
user to pass a shorter --filename, while preserving the rejected filename and
length-constraint details.
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src/runtime/cli/pack_command.rssrc/runtime/cli/package_manager_command.rssrc/runtime/cli/publish_command.rstest/cli/install/bun-pack.test.ts
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Additional findings (outside current diff — PR may have been updated during review):
-
🟡
src/runtime/cli/pack_command.rs:3058-3062— The description still claims three fixes that commit 5a8f1a1 reverted: (1) "Both branches now use the checked join" —--destinationat line 3058 still uses uncheckedjoin_abs_string_buf, so an over-long value still panics; (2) the two two-argument error messages (lines 3020-3027, 3077-3088) still pass a singleformat_args!to a two-{}template; (3) the--filename and --destinationtest still uses bare.toThrowError(). Please drop those three sentences (and the Problem-section--destination-panic bullet) from the description so reviewers don't approve on the assumption those bugs are fixed here.Extended reasoning...
What the finding is
The PR's second commit, 5a8f1a1 ("leave the error-message and --destination length changes to their own PRs"), deliberately reverted three ancillary fixes but the PR description was not updated to match. The description therefore overstates what this PR does, in violation of CLAUDE.md #11 ("NEVER overstate what you got done or what actually works ... in PRs").
The three stale claims, verified against HEAD (5a8f1a1)
Claim 1 — "Both branches now use the checked join, so an over-long
--filename/--destinationreports the existing 'too long' error instead of panicking."False for
--destination. Atsrc/runtime/cli/pack_command.rs:3058-3062, the--destinationbranch still calls the uncheckedresolve_path::join_abs_string_buf:let tarball_destination_dir = resolve_path::join_abs_string_buf::< resolve_path::platform::Auto, >( destination_base, dest_buf, &[pack_destination] );
Only the
--filenamebranch (line 3034) usesjoin_abs_string_buf_checked. The description's own Background section says "the unchecked variant indexes past the buffer", so the description simultaneously documents the panic and claims to have fixed it. The Problem section's bullet "--destinationwith a value longer than a path buffer also panicked" is likewise stale — it's still true after this PR.Claim 2 — "its two two-argument error messages were passing a single
format_args!to a two-placeholder template ... they now pass both arguments."False. At lines 3020-3027,
Output::err_genericis still called with the two-placeholder templatecannot use both ... filename "{}" and destination "{}"and a singleformat_args!("{} {}", filename, destination), so the message still renders asfilename "a.tgz out" and destination "". The same shape remains at lines 3077-3088 forarchive destination name too long: "{}/{}".Claim 3 — "the
--filename and --destinationtest now asserts the message."False.
test/cli/install/bun-pack.test.tsline 393 still reads:expect(async () => await pack(packageDir, bunEnv, "--filename=test.tgz", "--destination=packed")).toThrowError();
No message argument. The diff does not touch this test at all.
Why this matters
Commit 5a8f1a1's own message confirms the intent: "leave the error-message and --destination length changes to their own PRs". The revert is deliberate; the description just wasn't kept in sync. A reviewer reading only the description would reasonably conclude the
--destinationoverflow panic and both error-message formatting bugs are fixed here and might approve on that basis — or skip re-reviewing a follow-up PR that actually fixes them because "that already landed".The code that is in the diff is correct for what it does (resolve relative flags against the invoking cwd), so this is a description-accuracy issue, not a code defect.
How to fix
Edit the PR description to drop the three reverted claims. Concretely:
- In Problem, delete the final bullet about
--destinationpanicking on an over-long value (still true, still unfixed here). - In Fix, delete the sentence beginning "Both branches now use the checked join ..." and the following sentence about the two two-argument error messages.
- In the Verified with paragraph, drop "plus the
--filename and --destinationtest now asserts the message" and adjust "6 of the new/changed" to reflect only the tests actually added (the--filename and --destinationtest is unchanged).
Step-by-step proof
git log --oneline -2on this branch shows5a8f1a1e pm pack: leave the error-message and --destination length changes to their own PRson top of9c637def.- Open
src/runtime/cli/pack_command.rsat HEAD and go to line 3058: the call isresolve_path::join_abs_string_buf::<...>(destination_base, dest_buf, &[pack_destination])— no_checkedsuffix. Compare with line 3034 in the--filenamebranch, which does calljoin_abs_string_buf_checked. - At line 3020, the
err_genericcall for "cannot use both" takesformat_args!("{} {}", filename, destination)as its single argument tuple, feeding a template with two{}placeholders — the second placeholder receives nothing. grep -n 'toThrowError' test/cli/install/bun-pack.test.tsshows the--filename and --destinationtest still calls.toThrowError()with no argument;git diff main -- test/cli/install/bun-pack.test.tsshows no hunk touching that test.- Read the PR description's Fix section: it still contains all three claims contradicted by steps 2-4.
- In Problem, delete the final bullet about
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The description was rewritten when 5a8f1a1 was pushed and no longer makes those three claims (the review above was generated against the earlier text). The current description only describes the cwd change; the |
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I reviewed this PR and didn't find any bugs. Because it changes user-visible behavior (where relative --filename/--destination land, and the --quiet --filename output becoming absolute) and the description explicitly asks that it land together with #38704 to avoid breaking the workspace pack --filename && publish flow, a human look to coordinate the merge order would be worthwhile.
What was reviewed:
tarball_destination's new join logic —join_abs_string_buf_checkedwrites intodest_buf[..len-1]and the NUL attarball_name_lenstays in bounds; absolute flag values still win via the join.destination_baseselection keepsabs_workspace_pathwhen neither flag is set, so the default location andbun publish's pack-then-unlink path are unchanged.original_cwdthreading throughexec_with_manager/from_workspace— the packContextis local tofrom_workspaceso the borrow lifetime is fine.- Existing
--filename="..."tests don't assert on stdout, so the output-format change does not break them.
Extended reasoning...
Overview
This PR threads the invoking directory (the second element returned by PackageManager::init) into bun pm pack and bun publish's shared pack() path, stores it on pack::Context, and has tarball_destination resolve non-empty --filename/--destination values against it instead of against wherever PackageManager::init chdir'd to. The --filename branch switches from a raw copy_from_slice to join_abs_string_buf_checked (bounds-checked, into dest_buf[..len-1] with a NUL appended after); the --destination branch keeps its existing unchecked join but swaps the base to original_cwd when the flag is present. Ten new test.concurrent cases in bun-pack.test.ts cover workspace packages, subdirectories, --dry-run, absolute values, the default location, and the PATH_MAX error path.
Security risks
None identified. The path resolution uses the existing resolve_path helpers; original_cwd comes from PackageManager::init (the process's own invocation directory), not from untrusted input. The change does not introduce new file writes outside what --destination/--filename already permitted.
Level of scrutiny
Medium-high. The code change is small and the logic is straightforward, but this is a user-visible behavior change to a CLI command's output location. The PR description is explicit that landing this alone breaks the cd packages/foo && bun pm pack --filename ./x.tgz && bun publish ./x.tgz flow (which currently works only because both commands resolve against the wrong directory), and that it should land together with #38704. That merge-ordering constraint is something a human maintainer should confirm before merging.
Other factors
- All prior bot review threads (comment-cop on long doc comments, CodeRabbit on error-message wording) are resolved; the doc comments were shortened and the error-message change was correctly deferred to #38743.
- The
--quiet --filenameoutput changes from the raw flag value to a resolved absolute path. I checked the existingfilenameTestsinbun-pack.test.ts— they only assert onreadTarball(dest), not on stdout, so they are unaffected. - The new tests are hermetic (
tempDir,test.concurrent, no network), assert both the positive location (viareadTarball) and the negative (exists(...).toBeFalse()at the wrong locations), and the PATH_MAX suite is correctly skipped on Windows. - I verified
join_abs_string_buf_checked's contract insrc/paths/resolve_path.rs: it returnsNoneon overflow and otherwise a slice within the provided buffer, sodest_buf[tarball_name_len] = 0(withtarball_name_len <= dest_buf.len() - 1) is always in bounds.
…voking directory PackageManager::init chdirs to the package root (or the workspace root above it) before pack runs. --filename was then used verbatim, so it was relative to the directory bun chdir'd to, and --destination was joined onto the directory of the package being packed. Neither is the directory the user typed the path in. Thread the invoking directory that init already returns into pack and resolve both flags against it; with neither flag the tarball still goes next to the package.json. The --filename join is bounds-checked because it replaces the raw length check the verbatim copy had.
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I reviewed this PR and didn't find any bugs. Deferring to a human because this changes user-visible behavior (where relative --destination/--filename write and what --quiet prints) and the description says it must land together with #38704 to avoid breaking the pack --filename ./x.tgz && publish ./x.tgz flow from a workspace package — merge ordering needs a human decision.
What was reviewed
tarball_destination: verifiedjoin_abs_string_buf_checkedsemantics, the- 1reservation for the NUL terminator, and thatZStr::from_bufreceives the correct length; absolute inputs still win via the join.destination_baseselection keeps the default (no flag) atabs_workspace_path, sobun publish's pack-then-unlink path is unchanged.original_cwdlifetime throughpublish_command.rs— the borrow is confined to the localpack::Contextand does not escape into the returned publishContext.
Extended reasoning...
Overview
The PR threads the invoking directory (the second element of PackageManager::init's return) through PackCommand::exec_with_manager, the pack Context, and bun publish's from_workspace, and uses it as the base for resolving relative --destination and --filename in tarball_destination. The --filename branch switches from a verbatim copy to join_abs_string_buf_checked (bounds-checked, one byte reserved for the NUL). The --destination branch swaps its join base from abs_workspace_path to original_cwd when the flag is non-empty, leaving the default location unchanged. Ten new tests cover workspace packages, subdirectories of workspace and plain packages, ../ traversal, --dry-run, absolute paths, the default location, and PATH_MAX overflow/normalization.
Security risks
None identified. The change is CLI path resolution for an output tarball; inputs are the user's own flags and cwd. The bounds-checked join replaces a raw length check, which is a strict improvement. No new filesystem reads of untrusted data, no privilege boundaries crossed.
Level of scrutiny
Medium. The code change is small and mechanically sound, but it is a user-facing behavior change: relative --destination/--filename now land in a different directory than before, and --quiet with --filename now prints an absolute path instead of the raw flag value. Anyone scripting around the old (buggy) behavior will see a difference. The PR description also explicitly requires coordinated landing with #38704 — landing this alone breaks cd packages/foo && bun pm pack --filename ./x.tgz && bun publish ./x.tgz, which works today by accident. That merge-ordering decision needs a human.
Other factors
- The bug hunting system found no issues; I independently traced
join_abs_string_buf_checkedinsrc/paths/resolve_path.rsand confirmed it handles absolute parts,..normalization that shrinks below the buffer, and returnsNoneon overflow — matching the two new PATH_MAX tests. - All prior inline comments (comment-cop, CodeRabbit) are resolved; the long comments were shortened and the error-message wording was correctly deferred to #38743.
- The last robobun CI status comment (Build #97349) reported failures for an intermediate commit; a later commit (b58b4cf) has since landed but no updated status is visible in the timeline, so CI green should be confirmed before merge.
- Test coverage is thorough: each of the three-directory scenarios (invoking cwd, packed package dir, process cwd after chdir) is exercised, the negative locations are asserted absent, and tarball contents are checked — not just existence.
1 participant
Merge after #38704 (see the last Fix bullet). Found while working on #38704; there is no user report for this one.
Problem
bun pm pack --filename ./foo.tgzrun inside a workspace package writesfoo.tgzinto the workspace root, not the directory the command was run from.bun pm pack --destination ./out(or--filename ./out/x.tgz) run from a subdirectory of a package writes into<package root>/out, not<cwd>/out.--destinationlands in the package directory while a relative--filenamelands in the workspace root.PackageManager::initchdirs to the package root, or to the workspace root above it, before pack runs (src/install/PackageManager.rs,should_chdir_to_root).tarball_destinationinsrc/runtime/cli/pack_command.rsthen copied--filenameverbatim (so it was relative to whatever bun chdir'd to) and joined--destinationonto the directory of the package being packed. The directory the user typed the path in was not used by either branch.Fix
PackageManager::initalready returns the invoking directory;bun pm scan,pm version,pm licensesandpm pkgalready receive it. Pass it toPackCommand::exec_with_managertoo, store it on the packContext(bun publishfills it in as well, since it sharespack()), and hand it totarball_destination.tarball_destinationresolves a non-empty--filenameor--destinationagainst that directory. An absolute value still wins (the join keeps it), and with neither flag the base is still the packed package's directory, so the default tarball location,bun publish's pack-then-unlink of that path, and the existing tests are unchanged.--filenamejoin is the bounds-checked variant because it replaces the rawlen + 1 > buf.len()check that the verbatim copy had. The--destinationjoin is left as it was; its missing bounds check is pack: report an error instead of panicking when --destination does not fit the path buffer #38749, and this function's error-message arguments were fixed in pack: fill every placeholder in multi-argument error messages #38743 (already on main, this branch is rebased on top of it).--pack-destinationwithpath.resolveagainstprocess.cwd()(and never chdirs), anddocs/pm/cli/pm.mdxalready documents--destination ./distas saving into./dist/.--filename, the path printed after packing (and by--quiet) is now the resolved absolute path, as it already was for--destination, instead of the flag's raw value.test/cli/install/bun-pack.test.ts, newrelative --destination and --filename resolve against the cwdblock: workspace package, subdirectory of a workspace package with../dist(cwd, packed package and process cwd are three different directories there), subdirectory of a plain package,--dry-run, absolute values, the default location, and the over-long--filenameerror plus a long value that normalizes to one that fits. 6 of the new tests fail on the current release; all 89 in the file pass with this change.test/cli/install/bun-publish.test.ts: 39 pass with this change (run with a raised timeout; the debug build here is too slow for the file's 5s lifecycle-script tests).cd packages/foo && bun pm pack --filename ./x.tgz && bun publish ./x.tgzworks by accident: pack writes to the workspace root andbun publish <tarball>also resolves its argument against the root. publish: resolve a relative tarball path against the invoking directory #38704 on its own fixes the documentedbun pm pack && bun publish ./pkg.tgzflow and only breaks this accidental one; this PR on its own breaks the accidental flow without fixing anything on the publish side (verified: pack writespackages/foo/x.tgz, publish still opens<root>/x.tgz), so it is the one that has to go second. The branches merge cleanly in either order; with both applied the flow works and both test files pass (details below). Each PR's tests already pin its own command to the invoking directory; once publish: resolve a relative tarball path against the invoking directory #38704 is on main I will add the literal pack-then-publish round trip to this PR.Background
bun pm packandbun publishsharepack()inpack_command.rs. Before either runs,PackageManager::initwalks up from the cwd to the nearestpackage.json, checks whether apackage.jsonfurther up lists that directory as a workspace, andchdirs the process to the root it settles on. It returns the original cwd as the second element of its result so commands that care about where the user was (--filter,pm version, and now pack) can use it.abs_workspace_path(the directory of thepackage.jsonbeing packed, which is the workspace package even when invoked from one of its subdirectories), and the directory the command was run from. Only the last one is what a relative command-line path refers to.tarball_destinationreturns the tarball path plus the length of its directory prefix; the callermkdir -ps that prefix for--destination.--filenamereturns 0 there, so its parent directory is not created; that is unchanged (the existing--filename="out/foo.tgz"test relies on it).join_abs_string_buf_checked(src/paths/resolve_path.rs) ispath.resolve(base, value)into a caller-provided buffer, returningNoneinstead of overflowing it.Combined check with #38704, and what the first revision of this PR contained
With #38704 merged on top of this branch locally:
bun-pack.test.tsandbun-publish.test.tsboth pass in full (42 in the publish file, including #38704's three), and from a workspace packagebun pm pack --quiet --filename ./x.tgzfollowed bybun publish --dry-run ./x.tgzreads the tarball from the package directory and prints+ foo@1.2.3 (dry-run).The first revision of this PR also switched the
--destinationjoin to the bounds-checked variant and fixed the twoerr_genericcalls intarball_destinationthat passed oneformat_args!to a two-placeholder template. Those are #38749 and #38743 (the latter has since merged), so they were dropped here to keep this PR to the cwd change.