[security-fix] Fix unhandled error in test cleanup (Alert #392)

[github-actions]

Security Fix: Unhandled Error in Test Cleanup

Alert Number: #392
Severity: Low (Warning)
Rule: G104 - Errors unhandled
Tool: gosec (Golang security checks)
Location: pkg/testutil/tempdir.go:63

Vulnerability Description

Gosec detected an unhandled error from os.RemoveAll(tempDir) at line 63 in the t.Cleanup() function. The G104 rule flags situations where errors from function calls are silently ignored, which can lead to:

1. Silent failures: Cleanup failures go unnoticed, potentially leaving temporary directories behind
2. Resource leaks: Uncleaned temporary directories can accumulate over time
3. Debugging difficulties: Errors during cleanup are not logged, making it harder to diagnose issues
4. Violation of Go best practices: Error values should never be silently ignored

Fix Applied

Added proper error handling for the os.RemoveAll(tempDir) call in the test cleanup function:

Before:

t.Cleanup(func() {
    os.RemoveAll(tempDir)
})

After:

t.Cleanup(func() {
    if err := os.RemoveAll(tempDir); err != nil {
        t.Logf("Warning: failed to clean up temporary directory %s: %v", tempDir, err)
    }
})

This approach:

• Checks the error returned by os.RemoveAll()
• Logs a warning message when cleanup fails using t.Logf()
• Maintains backward compatibility - cleanup failures don't block test execution
• Follows Go best practices for defensive programming

Security Best Practices

1. Always handle errors: Even in cleanup/test paths, errors should be checked
2. Informative logging: Includes directory path and error details for debugging
3. Non-critical operations: Since this is cleanup in test teardown, we log warnings rather than failing tests
4. Consistent error handling: Applied the same pattern used elsewhere in the codebase

Testing Considerations

• ✅ Build succeeds: go build ./pkg/testutil/... passes without errors
• ✅ No breaking changes: Test behavior remains unchanged
• ✅ Error visibility: Cleanup failures are now logged in test output
• ✅ Minimal, surgical change: Only added error checking

Impact Assessment

Risk: Minimal
Breaking Changes: None
Backwards Compatibility: Full
Performance: No impact

The fix only adds error checking for a cleanup operation in test teardown. Test execution continues normally - cleanup failures are logged but don't fail tests, which is appropriate for non-critical cleanup operations.

Why This Fix Is Important

1. Improves test debugging: Helps diagnose cleanup failures in test environments
2. Follows Go conventions: Error values should never be silently ignored
3. Maintains code quality: Demonstrates proper defensive programming
4. Satisfies security scanners: Eliminates gosec G104 alert
5. Sets good precedent: Shows correct error handling pattern for test utilities

Files Modified

• pkg/testutil/tempdir.go:
  • Lines 62-66: Added error handling for os.RemoveAll() in t.Cleanup() function
  • Added warning log message with directory path and error details

References

• CodeQL Alert: https://github.com/githubnext/gh-aw/security/code-scanning/392
• Gosec G104: Audit errors not checked
• Go Error Handling: [Effective Go - Errors]((redacted)

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