Function findOverlayLowerdirs

core/mount/mount_linux.go:446–463

findOverlayLowerdirs returns the index of lowerdir in mount's options and all the lowerdir target.

(opts []string)

// findOverlayLowerdirs returns the index of lowerdir in mount's options and
// all the lowerdir target.
func findOverlayLowerdirs(opts []string) (int, []string) {
	var (
		idx    = -1
		prefix = "lowerdir="
	)

	for i, opt := range opts {
		if strings.HasPrefix(opt, prefix) {
			idx = i
			break
		}
	}

	if idx == -1 {
		return -1, nil
	}
	return idx, strings.Split(opts[idx][len(prefix):], ":")
}

// longestCommonPrefix finds the longest common prefix in the string slice.
func longestCommonPrefix(strs []string) string {