Method check

tools/mage/headers.go:133–160

(path string)

}

func (h Headers) check(path string) error {
	rule := headerConfig.get(path)
	if rule == nil {
		return nil
	}
	f, err := os.Open(path)
	if err != nil {
		return err
	}
	defer f.Close()
	s := bufio.NewScanner(f)
	for i, expected := range rule.headerLines {
		if !s.Scan() {
			return &checkErr{Path: path, Reason: "has less lines than expected header"}
		}
		line := s.Bytes()
		if i == 0 && bytes.Contains(line, []byte("generated")) {
			return nil // Skip generated files.
		}
		if !bytes.Equal(line, bytes.TrimSpace([]byte(rule.Prefix))) && !expected.Match(bytes.TrimPrefix(line, []byte(rule.Prefix))) {
			return &checkErr{Path: path, Reason: fmt.Sprintf("did not match expected header line: %v", expected)}
		}
	}
	if s.Scan() && len(s.Bytes()) != 0 {
		return &checkErr{Path: path, Reason: "does not have empty line after header"}
	}
	return nil
}

type errorSlice []error