Function getOverlayPath

core/diff/apply/apply_linux.go:75–91

(options []string)

}

func getOverlayPath(options []string) (upper string, lower []string, err error) {
	const upperdirPrefix = "upperdir="
	const lowerdirPrefix = "lowerdir="

	for _, o := range options {
		if after, ok := strings.CutPrefix(o, upperdirPrefix); ok {
			upper = after
		} else if after, ok := strings.CutPrefix(o, lowerdirPrefix); ok {
			lower = strings.Split(after, ":")
		}
	}
	if upper == "" {
		return "", nil, fmt.Errorf("upperdir not found: %w", errdefs.ErrInvalidArgument)
	}

	return
}

func doSyncFs(file string) error {
	fd, err := os.Open(file)