Keep the NODE_OPTIONS restore module outside the swept temp directory - #12208
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📝 WalkthroughWalkthroughThe wrapper now stores its Node options restore module in a configurable persistent directory instead of ChangesNode options guard persistence
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Severity of issue fixed: Low Merge Risk: 🟡 Moderate · up to Persistent restore-module storage addresses temporary-file cleanup, but custom guard-directory values can still cause Node preload failures or prevent cleanup of injected NODE_OPTIONS. Resolve override path handling before merge. Suggested reviewers: 🚥 Pre-merge checks | ✅ 24 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (24 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 1 files. (2 skipped: 1 unsupported, 1 too large.)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 2
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Inline comments:
In `@Resources/bin/cmux-claude-wrapper`:
- Line 856: Update ensure_node_options_restore_module and merge_node_options to
reject CMUX_NODE_OPTIONS_DIR values containing whitespace before creating or
requiring the restore module, while preserving the existing default guard_dir
behavior.
In `@tests/test_claude_wrapper_hooks.py`:
- Around line 214-215: Update the run_wrapper environment setup to assign
CMUX_NODE_OPTIONS_DIR to a path under the test tmp directory by default, then
apply the optional extra_env override afterward. Keep env.update(extra_env)
after the default assignment so callers can intentionally override it.
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Both correct, thanks. Confirmed each in the code and pushed 25968a2.
The shell suite still passes and the Swift file parses. I cannot build the macOS target locally, so the Swift side is relying on CI. |
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only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
In `@CLI/cmux.swift`:
- Around line 23709-23714: Update the CMUX_NODE_OPTIONS_DIR override handling to
expand a leading tilde before constructing the URL, matching the existing tilde
expansion used by ClaudeHookSessionStore.init and agentHookStatePath. Preserve
trimming and empty-value behavior while ensuring URL(fileURLWithPath:) receives
the expanded directory path.
- Around line 23706-23713: Update the override branch in the guard-directory
resolution logic to append the same fixed “cmux-” prefixed subdirectory used by
the default branch, rather than using CMUX_NODE_OPTIONS_DIR verbatim. Ensure
both branches produce a path recognized by isCmuxNodeOptionsRestoreModulePath
while preserving the existing fail-closed behavior for setup failures.
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Another data point in favour of getting this merged. Reproduced on cmux 0.64.25 (latest), macOS 27.0 (26A428). Timeline on one machine
So it isn't a rare edge case. Any machine that keeps a Claude session open overnight hits it on a regular cycle, about every 4 days. Why it matters beyond noise: Claude Code treats a hook that crashes before running as a non-blocking error. Every node-based PreToolUse guard (secret-read guards, write/path guards) therefore fails open until something launches On the fix: the approach in this PR looks right to me: a durable, space-free path, plus the #7028 is the same bug class for the per-pane |
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Thanks for working on this. #12022 is now fixed on main by #14814, which moves the Claude |
3 participants
Fixes #3463.
The restore shim is written to
$TMPDIRbut referenced byNODE_OPTIONSfor the life of the session. macOS sweeps that directory, and once the file is gone every node process in the session dies at preload, reporting little more than a version string. It is not limited to the wrapped agent: anything that inherits the variable is affected, and a failed CLI write can look like a successful one, which is how I found it.There are earlier attempts at this and I do not want to add noise, so for the record: #3699 has green checks but has gone stale and now conflicts with main; #12067 conflicts and its
testscheck is failing; #11270 and #3278 also have failing checks. This branch is cut from today's main andpython3 tests/test_claude_wrapper_hooks.pypasses. Happy for it to be closed in favour of any of those if one gets rebased.The change: move the shim to
$HOME/.cmux/node-options, matching the$HOME/.claudeand$HOME/.subrouterpaths already used in this file, with aCMUX_NODE_OPTIONS_DIRoverride following the existingCMUX_CUA_STATE_DIRstyle.Not
~/Library/Application Support/cmux: node splits NODE_OPTIONS on whitespace, so a--require=under a path containing a space breaks every node process instead. I tried that first and the suite caught it, so there is a comment to stop it being moved back. Might be worth checking against the failing runs on the other branches.Two existing tests pin the old path, which is the part that looks like it catches people:
test_live_socket_tmpdir_failure_skips_node_options_injectionbecomes..._guard_dir_failure_...and forces the failure throughCMUX_NODE_OPTIONS_DIR, since an unwritableTMPDIRno longer reaches the guard dir. Same invariant: when the module cannot be written, no--requireis injected.test_live_socket_stale_mktemp_literal_does_not_warnpoints the override at its own temp dir so it still exercises the real path.run_wrappergains anextra_envparameter.Need help on this PR? Tag
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Medium Risk
Changes where
NODE_OPTIONSpreload files live for every Node descendant in a cmux Claude session; a bad path or permissions could skip injection or break startup, but behavior on write failure stays “no inject.”Overview
Fixes session-wide Node failures when macOS sweeps temp files while
NODE_OPTIONSstill points at cmux’s--requirerestore shim.The restore module is written to
~/.cmux/cmux-node-options(overrideCMUX_NODE_OPTIONS_DIR) in bothcmux-claude-wrapperandcreateClaudeNodeOptionsRestoreModulein Swift, with comments that the path must stay space-free (Node splitsNODE_OPTIONSon whitespace) and still include/cmux-so existing path recognition keeps working.Tests gain
extra_envonrun_wrapper, rename the unwritable-temp case to guard-dir failure viaCMUX_NODE_OPTIONS_DIR, and point the stale-mktemptest at the new directory name.Reviewed by Cursor Bugbot for commit 25968a2. Bugbot is set up for automated code reviews on this repo. Configure here.
Summary by cubic
Moves the NODE_OPTIONS restore shim from
$TMPDIRto$HOME/.cmux/cmux-node-options(overridable viaCMUX_NODE_OPTIONS_DIR) so macOS temp sweeps no longer delete the preload file and break every node process that inheritsNODE_OPTIONSfor the session. The path stays space-free because node splitsNODE_OPTIONSon whitespace./cmux-path component soisCmuxNodeOptionsRestoreModulePathstill recognizes the shim.extra_envparameter onrun_wrapper; the unwritable-dir injection test now forces failure viaCMUX_NODE_OPTIONS_DIR, and the stale mktemp literal test points at the new location.Written for commit 25968a2. Summary will update on new commits.
Summary by CodeRabbit
Bug Fixes
CMUX_NODE_OPTIONS_DIRenvironment variable.Tests