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Fixes #4734: Add locking mechanism to prevent race condition in esbuild.mjs #4763

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Fixes #4734: Add locking mechanism to prevent race condition in esbuild.mjs #4763

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@roomote
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@roomote roomote commented Jun 16, 2025 •
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Summary

This PR fixes the race condition in CI that was causing ENOTEMPTY errors when multiple processes attempt to clean and write to the same src/dist directory concurrently.

Problem

The pnpm test command executed by the platform-unit-test job uses turbo to run tasks for multiple packages in parallel. The build script src/esbuild.mjs was being executed concurrently by different packages (e.g., roo-cline and @roo-code/types), causing race conditions when one process attempts to delete the src/dist directory while another process has already started writing new build artifacts back into it.

Solution

Implemented a file-based locking mechanism in src/esbuild.mjs that:

  • Prevents concurrent execution: Uses a lock file (.esbuild.lock) to ensure only one instance of the script runs at a time
  • Process PID tracking: Stores the process ID in the lock file to detect stale locks from crashed processes
  • Automatic cleanup: Removes stale locks when the original process is no longer running
  • Timeout handling: Fails gracefully if unable to acquire lock within 30 seconds
  • Signal handling: Properly releases locks on process exit (SIGINT, SIGTERM)

Testing

  • ✅ Verified the locking mechanism works correctly with sequential execution
  • ✅ Tested concurrent execution scenarios to ensure proper waiting behavior
  • ✅ Confirmed all existing tests pass
  • ✅ Validated the bundle command works through both direct execution and turbo

Changes

  • Added comprehensive locking system to src/esbuild.mjs
  • Imported proper Node.js timers module for ESLint compliance
  • Wrapped main execution in try/finally block for guaranteed lock cleanup

Fixes #4734

Important

Introduces a file-based locking mechanism in src/esbuild.mjs to prevent race conditions during concurrent execution.

  • Locking Mechanism:
    • Added file-based locking in src/esbuild.mjs to prevent concurrent execution using .esbuild.lock.
    • acquireLock() and releaseLock() functions manage lock acquisition and release.
    • Handles stale locks by checking process IDs and removing if necessary.
    • Ensures lock release on process exit (SIGINT, SIGTERM).
  • Timeout and Error Handling:
    • Fails if lock not acquired within 30 seconds.
    • Wraps main execution in try/finally for lock cleanup.
  • Miscellaneous:
    • Imported Node.js timers module for ESLint compliance.

This description was created by Ellipsis for 271cc13. You can customize this summary. It will automatically update as commits are pushed.

@roomote
Fixes #4734: Add locking mechanism to prevent race condition in esbui…
271cc13 
…ld.mjs

- Implemented file-based locking system to prevent concurrent execution
- Added process PID tracking and stale lock cleanup
- Ensures sequential execution when multiple packages run bundle task
- Prevents ENOTEMPTY errors during CI builds
- Added proper error handling and lock cleanup on process exit
@roomote roomote requested review from cte, jr and mrubens as code owners June 16, 2025 21:30
@dosubot dosubot bot added size:L This PR changes 100-499 lines, ignoring generated files. bug Something isn't working labels Jun 16, 2025
@hannesrudolph hannesrudolph added the Issue/PR - Triage New issue. Needs quick review to confirm validity and assign labels. label Jun 16, 2025
@daniel-lxs daniel-lxs moved this from Triage to PR [Needs Prelim Review] in Roo Code Roadmap Jun 17, 2025
@hannesrudolph hannesrudolph added PR - Needs Preliminary Review and removed Issue/PR - Triage New issue. Needs quick review to confirm validity and assign labels. labels Jun 17, 2025
@daniel-lxs
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daniel-lxs commented Jun 18, 2025

Hey @KJ7LNW, what do you think of this PR? It looks like it's trying to implement something similar to what you suggested in your issue, but it doesn't seem to be working as intended.

It seems that the locking mechanism has a flaw: it releases the lock too early. Looking at the error output of the CI workflow:

  1. Lock acquired ✓
  2. "Cleaning dist directory" logged ✓
  3. Lock released ✓
  4. ENOTEMPTY error occurs ✗

The issue is that the lock is released right after cleaning the directory, but before esbuild finishes writing its output. Since esbuild plugins write files asynchronously in their onEnd callbacks, those file operations happen after the lock has already been released.

This recreates the original race condition:

  • Process A: acquires lock → cleans directory → releases lock → starts writing files
  • Process B: acquires lock → tries to clean directory → fails with ENOTEMPTY because Process A is still writing

The lock should be held until esbuild.context().rebuild() completes and all file operations are done, not just until after the initial cleanup.

@daniel-lxs daniel-lxs moved this from PR [Needs Prelim Review] to PR [Changes Requested] in Roo Code Roadmap Jun 18, 2025
@KJ7LNW
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KJ7LNW commented Jun 18, 2025 •
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This PR is too messy for me to review properly:

My suggestion would be not to hand-roll locking mechanisms across multiple processes, they are too complicated, and there are cross-platform considerations to handle (ie, this PR appears to be rather UNIX specific).

This is what I am using in the safeWriteJson PR to avoid reinventing the wheel:

At 3M downloads per week, it is certainly stable!

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daniel-lxs commented Jun 18, 2025

Closing for now, see #4763 (comment)

@daniel-lxs daniel-lxs closed this Jun 18, 2025
@github-project-automation github-project-automation bot moved this from New to Done in Roo Code Roadmap Jun 18, 2025
@github-project-automation github-project-automation bot moved this from PR [Changes Requested] to Done in Roo Code Roadmap Jun 18, 2025
@roomote roomote deleted the fix-4734 branch June 19, 2025 15:42
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@mrubens mrubens Awaiting requested review from mrubens mrubens is a code owner

@cte cte Awaiting requested review from cte cte is a code owner

@jr jr Awaiting requested review from jr jr is a code owner

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CI: Race condition in esbuild.mjs causing ENOTEMPTY errors

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