return !errors.Is(err, fs.ErrNotExist)
}

const (
	// PrivateFileMode grants owner to read/write a file.
	PrivateFileMode = 0o600
)

// DirEquals check if two directories are referring to the same directory
func DirEquals(a, b string) (bool, error) {
	aa, err := filepath.Abs(a)
	if err != nil {
		return false, err
	}
	bb, err := filepath.Abs(b)
	if err != nil {
		return false, err

	// to the special /etc/certs directory. In this case, we need to ensure we do *not* read from
	// these files, otherwise we would never rotate.
	outputToCertificatePath, ferr := file.DirEquals(filepath.Dir(cf.CertificatePath), sc.configOptions.OutputKeyCertToDir)
	if ferr != nil {
		return false, nil, ferr
	}
	// When there are existing root certificates, or private key and certificate under