Function MustClean

internal/tracetest/clean.go:34–50

MustClean makes traces more deterministic for tests by: - replacing the environment-specific path to errtrace with the fixed path /path/to/errtrace - replacing line numbers with the lowest values that maintain relative ordering within the file Note that lines numbers are replaced with increasing v

(trace string)

// with earlier positions in the file getting lower numbers.
// The relative ordering of lines within a file is maintained.
func MustClean(trace string) string {
	// Get deterministic file paths first.
	trace = strings.ReplaceAll(trace, getErrtraceDir(), _fixedDir)

	replacer := make(fileLineReplacer)
	for _, m := range _fileLineMatcher.FindAllStringSubmatch(trace, -1) {
		file := m[1]
		lineStr := m[2]
		line, err := strconv.Atoi(lineStr)
		if err != nil {
			panic(fmt.Sprintf("matched bad line number in %q: %v", m[0], err))
		}
		replacer.Add(file, line)
	}

	return strings.NewReplacer(replacer.Replacements()...).Replace(trace)
}

func getErrtraceDir() string {
	_, file, _, _ := runtime.Caller(0)