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… name create_exec_argv re-parses argv and treated every token starting with "-" as an exec arg, so a script started as `bun run - a b` reported execArgv ["-"] (plus every later dash-prefixed user arg), and child_process.fork() from such a script launched the child with "-" in front of the module path, running stdin instead of the module. The CLI parses a bare "-" as the script positional (stdin) and "--" as "the next token is the script", so both now end execArgv, unless they are the value of an option that consumes the next token (`--conditions -`), which still counts as an exec arg. The value-consuming set now only contains options that actually take the following token (One/Many); optional-value options such as -c and --inspect never do, so `bun -c app.js` no longer reports app.js in execArgv.
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Status (2026-09-20): the diff is ready for a maintainer. The branch head is CI on the head (#118849): 180 of 181 jobs passed. The failed job is Reproduction on canary 1.4.3 (
Node v26.3.0 agrees with the fixtures: Local result with a debug build of The loop in Earlier CI runs on this branch:
This PR is not a duplicate of #34658 or #34654. Neither stops at the bare |
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WalkthroughChangesThe runtime now parses Node execArgv parsing
Suggested reviewers: Priority: ➖ Normal Merge Risk: 🔵 Low · up to The test coverage works, but its structure does not meet the repository’s required parameterized-test convention. Address this before merging or accept the bounded test-maintenance deviation. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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LGTM — focused fix that makes create_exec_argv's re-parse mirror the CLI parser's actual token rules.
What was reviewed:
- Verified against
src/clap/streaming.rs: bare-/--are classifiedPositional(line 319), andOneOptionalparams never pull the next token whileOne/Manydo — the newCONSUMES_NEXT_ARGpredicate matches. - Checked the
awaiting_value-first ordering doesn't regress the existing fixtures (-e bruh, value-shaped tokens after a value-taking flag) and incidentally fixes-e run. - Test additions cover the variant matrix (
run -, auto-,--, node-mode--,-/--as option values,-c) plus the end-to-endfork()failure that motivated it.
Extended reasoning...
Overview
This PR fixes process.execArgv for three related cases in the argv re-parse loop in src/runtime/node/node_process.rs::create_exec_argv: a bare - (stdin script marker) and -- were being pushed as exec args instead of terminating the list like a script name, and OneOptional params (-c/--config, --inspect) were incorrectly treated as consuming the next token. Two test files gain coverage: a 10-row expansion of the process.execArgv fixture table, and a new fork() regression test that exercises the user-visible symptom (fork() from a bun run - parent launching the child with - in front of the module path).
Security risks
None. This is pure argv-token classification for a Node-compat property; no external input, no privilege boundary, no allocation on untrusted sizes.
Level of scrutiny
Medium. process.execArgv feeds child_process.fork() and new Worker({execArgv}) defaults, so a wrong value silently breaks child launches — but the change is contained to one ~40-line loop and makes it more faithful to the CLI parser it is emulating. I cross-checked each claim against src/clap/streaming.rs: parse_next_arg classifies both - and -- as ArgKind::Positional; the long/short arms consume iter.next() only for One/Many, never OneOptional. The new awaiting_value state machine mirrors that exactly, and moving the value-consume check before the --prefix check is required for --conditions - / --conditions -- to round-trip (which the CLI parser accepts unconditionally via iter.next()).
Other factors
- The three pre-existing fixtures still produce the same result under the new loop (traced by hand); the new ordering also fixes an unlisted edge case where
-e runused to lose its value to theseen_runbranch. - The
Valuesenum has exactly four variants (None/One/Many/OneOptional), so thematches!covers the intended set with no gaps. NODE_SHORT_ALIASEShandling is unchanged and still correct (the-pe → -palias inherits value-taking from-p).- Test structure follows repo conventions (
tempDir, drained pipes, singletoEqualon the whole fixture map for a useful diff on failure). The stdin-redirect trick (< ${script}) lets the same fixture file serve bothindex.tsand-positions without duplication. - The PR notes the overlap with #34658; whichever lands second is a small rebase of this loop.
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This PR may be a duplicate of:
🤖 Generated with Claude Code |
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Checked the three against this branch (fetched each PR head and read the
So the bare |
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I reviewed this PR and didn't find any bugs — the awaiting_value state machine correctly mirrors src/clap/streaming.rs (verified that One/Many params unconditionally consume the next token while OneOptional returns early), and the fixture table covers the -/--/-c/--conditions run cases. A human look would still help for two reasons: comment-cop has three unaddressed inline flags on the new multi-line comments, and there are three overlapping open PRs (#34658, #34654, #35779) touching the same loop where a maintainer should pick the merge order.
What was reviewed
- Traced every new fixture row through the rewritten loop; all match, including
--conditions run(previously mis-setseen_run) and--flag=value(not in the set, soawaiting_valuestays false). - Confirmed against
src/clap/streaming.rs:120-148thatOneOptionalnever pulls the next token andOne/Manypull it unconditionally regardless of spelling. - Checked the fork()-from-stdin test follows harness conventions (
tempDir, drains all pipes, asserts combined object before exitCode).
Extended reasoning...
Overview
The PR rewrites the argv re-parsing loop in create_exec_argv (src/runtime/node/node_process.rs) so process.execArgv stops at a bare - (stdin script) or -- the same way it stops at a script name, and narrows the "consumes next token" set from takes_value != None to One | Many so OneOptional params (-c, --inspect) no longer swallow the following token. State tracking moves from prev: Option<&[u8]> to awaiting_value: bool, which also fixes --conditions run (previously the run branch fired before the value-consuming check). Tests add 11 new fixture rows to the execArgv table and an end-to-end fork() from a stdin-piped parent.
Security risks
None. This is read-only reconstruction of a string array from process argv; no unsafe blocks touched, no allocation ownership changes, no user-controlled parsing beyond what the CLI already accepted.
Level of scrutiny
Medium — Node-compat behavior change on a rarely-read property, but with a concrete downstream consumer (child_process.fork()). The loop is ~25 lines of straightforward token classification; I verified it against the actual clap streaming parser semantics rather than trusting the description. The fixture table is exhaustive for the cases the description lists.
Other factors
- comment-cop: three inline bot flags on the new multi-line comments (lines ~322, ~343, ~371). The comments explain non-obvious cross-module semantics (why
OneOptionalis excluded, why-/--terminate) rather than justifying a workaround, so they may be false positives against the "one line" rule — but they're unaddressed and the repo's REVIEW.md does say "One line." - Overlapping PRs: #34658, #34654, and #35779 all touch this loop with partially-duplicate fixes. The author has already analyzed the overlap in a follow-up comment (none of them handles bare
-), but a maintainer should decide merge order. - Tests: hermetic, assert exact values, drain all pipes concurrently, use
tempDir. The fixture-table refactor toPromise.all+Object.fromEntrieskeeps per-row failure messages keyed by the original command string.
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LGTM — focused fix to the create_exec_argv re-parse loop with thorough fixture coverage.
What was reviewed:
- Verified against
src/clap/streaming.rs:OneOptionalparams never pull the next token (line 120-130),One/Manypull it unconditionally (line 138), and bare-/--are classified asArgKind::Positional(line 319) — the new loop mirrors the real parser exactly. - Traced every fixture row (including the three pre-existing ones) through the new
awaiting_valuestate machine; the ordering (awaiting-value →-/--break → flag push →runskip) is correct for--conditions -,--conditions run, and-c script. - The fork()-from-stdin test drains stdout/stderr/exited concurrently and asserts output before exit code; ordering is deterministic since child inherits the parent's stdout fd.
Extended reasoning...
Overview
This PR fixes process.execArgv in src/runtime/node/node_process.rs (create_exec_argv) to stop treating bare - (stdin script marker) and -- (positional terminator) as exec args, and to stop treating OneOptional params (-c, --inspect) as consuming the next token. The loop is refactored from a trailing prev-lookup to a leading awaiting_value flag, which also fixes the case where an option's value is spelled -, --, or run. Two test files gain coverage: 11 new rows in the process.execArgv fixture table and one fork()-from-stdin integration test.
Security risks
None. The change only affects what process.execArgv reports (a read-only informational array). No parsing of untrusted input, no auth/crypto/permissions, no memory-unsafe code.
Level of scrutiny
Moderate. This is Node-compat behavior with a downstream consumer contract (fork() and new Worker() prepend execArgv to the child's argv), so getting it wrong breaks child-process spawning. I verified the three semantic claims the PR relies on directly against src/clap/streaming.rs: (1) parse_next_arg returns ArgKind::Positional for both - and --; (2) the OneOptional branch returns without calling iter.next(); (3) the One/Many branch calls iter.next() unconditionally regardless of what the next token looks like. All three match the new re-parse loop's rules exactly, so bun <execArgv> <script> <argv> round-trips.
Other factors
- The
CONSUMES_NEXT_ARGstatic was hoisted out of the loop body, but as aLazyLockstatic this is purely cosmetic. TheValues::One | Values::Manypredicate correctly excludesNoneandOneOptional(the enum has exactly four variants). - Not CODEOWNER-covered. All comment-cop bot feedback is resolved (comments were shortened in 99b81db). No outstanding human reviewer comments.
- Three overlapping open PRs (#34658, #34654, #35779) touch the same loop; the author has documented the overlap and none of them handles the bare
-case. That's a merge-order coordination question for the maintainer, not a correctness concern for this change. - Test quality: fixtures now run in parallel via
Promise.all, allcmdkeys are unique (noObject.fromEntriescollisions), stdin is piped to every fixture so-cases execute the same script, and the fork test usestempDir/await usingper harness conventions.
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Updated 11:50 PM PT - Sep 19th, 2026
❌ @robobun, your commit 6aee198 has 1 failures in
🧪 To try this PR locally: bunx bun-pr 38577That installs a local version of the PR into your bun-38577 --bun |
…st short does, and bun run has no -pe alias
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I re-reviewed the latest push and found no new bugs; since create_exec_argv hand-mirrors the CLI parser's token rules and the ---in-execArgv question from my earlier thread is one only a real node --no-warnings -- app.js run can settle, a human look is still worthwhile.
What was reviewed:
- The new
ENDS_CHAINrule againstchainging()insrc/clap/streaming.rs: anOneOptionalshort returns without a value and resets the chain, so-ce index.tsreporting["-ce"]withindex.tsas the script now matches the parser. consumes_next_argfor-e=code,-eb,-be code,--conditions=x, and-pewith/withoutrun— each agrees with clap's attached-value, last-short, andshort_aliaseshandling (aliases are only installed for AutoCommand/RunAsNodeCommand inArguments.rs).CONSUMES_NEXT_ARGis built fromAUTO_PARAMS;RUN_PARAMSadds no value-taking params beyond it, so therunpath is covered by the same set.
Extended reasoning...
Overview
The PR rewrites the process.execArgv reconstruction loop in src/runtime/node/node_process.rs (create_exec_argv) so it classifies argv tokens the way src/clap/streaming.rs does: an option that takes a One/Many value pulls the next token unconditionally, a bare - or -- otherwise terminates execArgv like a script name, OneOptional params (-c, --inspect*) never consume the next token, short chains hand the next token only to a trailing value-taking short, and the -pe alias applies only outside bun run. Tests were added in test/js/node/process/process.test.js (an expanded fixture table run concurrently with the fixture also fed on stdin) and test/js/node/child_process/child_process.test.ts (fork() from a parent piped into bun run -). Since my previous review, commit c7aca13 added ENDS_CHAIN to address the -ce chain finding I raised.
Security risks
None specific to this change. The code reads the process's own argv, allocates via bun_core::handle_oom, and only produces a string array for process.execArgv; no untrusted external input or privilege boundary is involved. The practical consequence of a misclassification is a wrong fork()/Worker command line for the current user, not a security issue.
Level of scrutiny
Moderate-to-high. The loop is a hand-maintained mirror of the clap parser's token rules rather than a shared implementation, so any future change to AUTO_PARAMS value kinds or chaining semantics must be reflected here by hand. I traced the chain logic against chainging() (OneOptional returns with no value and sets state Normal; a value-taking short takes the rest of the token or, when last, the next iterator item), the long-form exact lookup (--flag=value correctly does not match), and the alias gating against Arguments.rs:802-805. Those all agree. The one point I cannot settle in this environment is whether Node keeps -- in process.execArgv; my earlier inline thread argued it does (based on ArgsInfo::pop_first pushing to exec_args before the -- break), the author resolved that thread without changing the break, and the fixture at process.test.js certifies the drop in node mode. A human with a node binary can confirm in one command.
Other factors
The exit reason was dry_streak and no new findings surfaced this run. Existing coverage (run-eval, as-node, worker execArgv tests, test-child-process-fork-exec-argv.js) is claimed by the author to still pass but is not verified here. The new tests drain pipes via Promise.all, use tempDir, and assert a combined object before the exit code, matching harness conventions. Given the unresolved prior objection and the mirrored-parser design, I am not approving, but nothing in the latest commits warrants a new inline finding.
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On the The fixture |
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CI status: the only red lane on the latest run is test/js/bun/spawn/spawn.test.ts (an unref'd child lifetime test on debian x64-asan). It fails on main too and does not touch execArgv. All execArgv and fork fixtures pass on every lane. |
Take the short chain rules (c0eb204, 6c89116, c7aca13) out of create_exec_argv again. #34654 splits a chain into separate tokens (`-br x` becomes `-b -r x`) and tests that form. The rows here pinned the raw form (`-be code`), so the two changes disagreed on the result. The fixture table gets the command from #25387 (`-e CODE -- --silent a`). The optional-value row uses `--config`, because #32622 gives `-c` to `--check`.
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In `@test/js/node/process/process.test.js`:
- Around line 1879-1880: Refactor the parameterized fixture list in the
surrounding process argument test to use describe.each(), creating an isolated
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Fixes #25387
Problem
process.execArgvkeeps tokens that are not runtime options. They are the script after--inspect, the stdin marker-, and--with the user options after it.fork()putsprocess.execArgvbefore the module path. Underbun --inspect app.jsthe child runsapp.jsagain. Underbun run -it exits 1 witherror: Module not found '<cwd>/[stdin]'.create_exec_argv(src/runtime/node/node_process.rs) pushes each-token before its script-name branch. It also lets optional-value options take the next token.Fix
--conditions -). Otherwise a bare-or--ends execArgv like a script name. Optional-value options take no token.fork()andnew Worker()runbun <execArgv> <script>to start the same options. The result equals node v26.3.0 where node accepts the command line.process.execArgvtable intest/js/node/process/process.test.js(canary 1.4.3 fails 10 of 15 rows) and thefork()test inchild_process.test.ts.Background
process.execArgvlists the runtime options between the executable and the script.create_exec_argvbuilds it from the raw argv by the parser's token rules.-as the script reads the script from stdin.--makes the next token the script. The parser treats both as positionals.OneandManyoptions (src/clap) take the next token as the value.OneOptionaloptions (--inspect,--config) take a value only as--flag=value.Notes
Sites left out on purpose:
execArgvoption of aWorkerkeeps a--:new Worker(f, { execArgv: ["--pending-deprecation", "--"] })reports both tokens, and node drops the--. process: execArgv fix, getActiveResourcesInfo with sockets/servers/fs, _getActiveHandles/_getActiveRequests (+9 tests, process 85%→94%) #34658 cuts that list at--and adds node'stest-process-exec-argv.js.bun -be codereports["-be"]) andbun run -pe x. Both were wrong before this PR. process/worker: env descriptor validation, worker execArgv policy table with per-worker --expose-gc (+2 tests, worker 74%→76%) #34654 splits a chain into separate tokens (-br xbecomes-b -r x), tests that form, and checksrunfor the-pealias. This branch had chain rules for one day (c0eb204c20,6c89116135,c7aca13346).6aee1980e0took them out because their fixture rows pinned the raw form, which disagrees with process/worker: env descriptor validation, worker execArgv policy table with per-worker --expose-gc (+2 tests, worker 74%→76%) #34654.-when picking the subcommand (bun - add xranbun add x) #38568 and cli: take flag arity from the auto table when the subcommand is classified #41511, and the-c/--configvalue in cli: make -c/--config require a path; stop treating the config path as a package to install #34983.Overlap with open PRs:
-. process/worker: env descriptor validation, worker execArgv policy table with per-worker --expose-gc (+2 tests, worker 74%→76%) #34654 moves the loop and has no-or--case. cli: read the script from stdin fornode -in node emulation #38566 addsnode -itself. The PR that lands second needs a small rebase of this loop.-cto--check, so the optional-value fixture row uses--config.Checks against node v26.3.0:
node --no-warnings -- app.js xandnode --no-warnings - a bboth report["--no-warnings"].node -e CODE -- --silent areports["-e", CODE], which is the output thatprocess.execArgvincludes user options with the same names as bun's options #25387 expects.node --inspect=0 parent.jswithfork("./child.js")runschild.js. Canary 1.4.3 (367d939d9) runsparent.jsa second time. This branch runschild.js.-and--as option values. Bun's CLI accepts them, so execArgv reports them (--conditions -gives["--conditions", "-"]).Reach of the change:
process.execArgvin a worker that has no explicitexecArgv, and bun when it runs asnode. A compiled executable returns early and does not change.Tests run with a debug build of this branch:
test/js/node/process/process.test.js: 173 pass, 5 skip, 0 fail. Thefork()test inchild_process.test.tspasses.test/cli/run/run-eval.test.ts,test/cli/run/as-node.test.ts,test/js/node/util/parse_args/default-args.test.mjs,test/bundler/compile-process-execargv.test.ts, the execArgv tests intest/js/web/workers/worker.test.tsandtest/js/node/worker_threads/worker_threads.test.ts, andtest/js/node/test/parallel/test-child-process-fork-exec-argv.js.Self-review concerns:
6aee1980e0.-cfixture row breaks when Node v26 CLI compatibility: make node:cli tests pass (+9 upstream tests) #32622 lands. Addressed: the row uses--config.WorkerexecArgvsite still keeps--. Addressed: named above as left to process: execArgv fix, getActiveResourcesInfo with sockets/servers/fs, _getActiveHandles/_getActiveRequests (+9 tests, process 85%→94%) #34658.process.execArgvincludes user options with the same names as bun's options #25387 but did not say so. Addressed:Fixes #25387and a fixture row with that command.--inspectcase, and the test counts were stale. Addressed in this body and the title.no test proof · iteration 4 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/js/node/process/process.test.js, test/js/node/child_process/child_process.test.ts