fix(server): pin background service to a stable Node path - #11061
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ApprovabilityVerdict: Would Approve Macroscope's review found this PR approvable — This is a focused fix that replaces fragile Homebrew Node keg paths in background-service installation and child-process launching, with targeted coverage and limited scope. Unresolved high-severity path-selection risks remain around versioned Homebrew formulas and unverified argv0 values, and independently block approval until addressed. Not approved because:
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Included review availability: Your plan provides up to 10 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe change adds Homebrew-aware Node executable resolution. It validates ChangesNode executable resolution
Priority: ⬆️ High Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix · Severity of issue fixed: High Sequence Diagram(s)sequenceDiagram
participant BootService
participant stableNodeExecutablePath
participant ServicePlan
participant SystemdRenderer
BootService->>stableNodeExecutablePath: Resolve host.execPath and host.argv0
stableNodeExecutablePath-->>BootService: Return stable executable path
BootService->>ServicePlan: Store executable path and update PATH
BootService->>SystemdRenderer: Pass environment PATH
SystemdRenderer-->>BootService: Render Environment=PATH
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✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@apps/server/src/stableNodeExecutablePath.ts`:
- Line 31: Update stableNodeExecutablePath to preserve versioned Homebrew
formulas by capturing the formula name from the Cellar path and returning the
corresponding /opt/homebrew/opt/<formula>/bin/node path, while retaining
/opt/homebrew/bin/node for the unversioned node formula. Add regression coverage
for stableNodeExecutablePath and the boot-service flow using argv0 set to
"node", including the node@22 example.
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apps/server/src/cloud/bootService.test.tsapps/server/src/cloud/bootService.tsapps/server/src/serviceLauncher.tsapps/server/src/stableNodeExecutablePath.test.tsapps/server/src/stableNodeExecutablePath.ts
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Addressed both review notes on this branch (
Helper owns both rules so bootService and the launcher stay consistent. Focused tests 51/51. |
Homebrew Node realpaths process.execPath into a Cellar keg that brew upgrade deletes. Persist the prefix shim in launchd/systemd units and spawn managed runtimes through the same durable path.
Versioned node@ formulas are keg-only, so rewriting Cellar execPath to $prefix/bin/node can pick a different major. Persist $prefix/opt/node@N/bin/node instead, and ignore argv0 unless it resolves to the same executable as execPath.
Keg-only node@ Cellar paths already rewrite to $prefix/opt/node@N/bin. Do not put an exec -a alias such as /tmp/not-node on the service PATH; prefer host.execPath unless argv0 resolves to the same Node binary.
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Actionable comments posted: 2
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@apps/server/src/cloud/bootService.ts`:
- Line 589: Update the systemd boot-service flow so environmentPath is passed
from systemdManager to renderBootServiceUnit and rendered as an
Environment=PATH= entry, preserving the resolved PATH for Linux units and
satisfying the existing assertion.
In `@apps/server/src/stableNodeExecutablePath.ts`:
- Around line 31-36: Update the stat calls in the stable executable validation
flow to use bigint results for both argv0 and execPath, including
bigint-compatible permission-mask comparisons; then compare their dev and ino
fields as BigInts in the existing identity check.
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apps/server/src/cloud/bootService.test.tsapps/server/src/cloud/bootService.tsapps/server/src/stableNodeExecutablePath.test.tsapps/server/src/stableNodeExecutablePath.ts
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systemd units do not embed PATH. Check the launchd plist so a Cellar linuxbrew execPath still contributes $prefix/bin, not the keg.
launchd already received the durable host-Node directory. systemd ignored environmentPath, so Linuxbrew Cellar rewrites never reached the unit. Emit Environment=PATH=... and compare argv0 identity with bigint stats so large inodes cannot collide.
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Macroscope threads resolved — fixes are on HEAD (
Ready for another look when you have a moment. |
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Closing: this was overtaken on main. Since #11510 and #11702 the service unit runs the pinned runtime binary ( |
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What Changed
t3 service install/updatenow persist a durable absolute Node path in launchd and systemd units instead of Homebrew's versioned Cellar realpath. The service launcher uses the same path when handing off managed runtimes, so a laterbrew upgrade nodedoes not leaveProgramArguments[0]/ExecStartpointing at a deleted keg.Why
Homebrew's
/opt/homebrew/bin/nodeis a symlink. Node realpathsprocess.execPathto/opt/homebrew/Cellar/node/<version>/bin/node. That keg disappears on upgrade even though the prefix shim still works. The renderer already requires an absolute Node (noPATHlookup); the bug was pinning the keg realpath.When
process.argv0is already a non-keg absolute (for example/opt/homebrew/bin/nodeor/opt/homebrew/opt/node@22/bin/node), that path is kept. Otherwise a Cellar/Caskroom execPath is rewritten to$prefix/bin/<name>. Distro and nvm paths are unchanged.Fixes #11054
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