defer func(store *QueueStore[I]) {
		store.RUnlock()
		if err != nil && !os.IsNotExist(err) {
			// Upon error we remove the entry.
			store.Del(key)
		}
	}(store)

	raw, err = os.ReadFile(filepath.Join(store.directory, key.String()))
	if err != nil {
		return
	}

	if len(raw) == 0 {
		return raw, os.ErrNotExist
	}

	return
}

// Get - gets an item from the store.

			generated, err := os.ReadFile(outputFilePath)
			if err != nil {
				log.Fatalf("Cannot read generated IPTables rule file: %v", err)
			}
			generatedRules := getRules(generated)

			refreshGoldens(t, tt.golden, generatedRules)

			// Compare generated iptables rule with golden files.
			golden, err := os.ReadFile(tt.golden)
			if err != nil {

		t.Fatalf("unexpected CreateHeader error: %v", err)
	}
	if err := w.Close(); err != nil {
		t.Fatalf("unexpected Close error: %v", err)
	}

	want, err := os.ReadFile("testdata/time-go.zip")
	if err != nil {
		t.Fatalf("unexpected ReadFile error: %v", err)
	}
	if got := buf.Bytes(); !bytes.Equal(got, want) {
		fmt.Printf("%x\n%x\n", got, want)
		t.Error("contents of time-go.zip differ")
	}
}

const (
	cgroupV1MemLimitFile = "/sys/fs/cgroup/memory/memory.limit_in_bytes"
	cgroupV2MemLimitFile = "/sys/fs/cgroup/memory.max"
)

func cgroupMemLimit() (limit uint64) {
	buf, err := os.ReadFile(cgroupV2MemLimitFile)
	if err != nil {
		buf, err = os.ReadFile(cgroupV1MemLimitFile)
	}
	if err != nil {
		return 0
	}
	limit, err = strconv.ParseUint(strings.TrimSpace(string(buf)), 10, 64)
	if err != nil {

	return forEachLoopbackRoute(cfg, "remove", netlink.RouteDel)
}

const ipv6DisabledLo = "/proc/sys/net/ipv6/conf/lo/disable_ipv6"

func ReadSysctl(key string) (string, error) {
	data, err := os.ReadFile(key)
	if err != nil {
		return "", err
	}
	return strings.TrimSpace(string(data)), nil
}

func forEachLoopbackRoute(cfg *Config, operation string, f func(*netlink.Route) error) error {

	debug, err := extractConfigDump(kubeClient, podName, podNamespace, includeEds)
	if err != nil {
		return nil, err
	}
	return setupConfigdumpEnvoyConfigWriter(debug, out)
}

func readFile(filename string) ([]byte, error) {
	file := os.Stdin
	if filename != "-" {
		var err error
		file, err = os.Open(filename)
		if err != nil {
			return nil, err
		}
	}
	defer func() {

// tries to verify whether the disk has bitrot.
//
// Additionally ReadFile also starts reading from an offset. ReadFile
// semantics are same as io.ReadFull.
func (s *xlStorage) ReadFile(ctx context.Context, volume string, path string, offset int64, buffer []byte, verifier *BitrotVerifier) (int64, error) {
	if offset < 0 {
		return 0, errInvalidArgument
	}

	volumeDir, err := s.getVolDir(volume)
	if err != nil {

	respBody, err := client.callGet(ctx, storageRESTMethodReadFileStream, values, nil, -1)
	if err != nil {
		return nil, toStorageErr(err)
	}
	return respBody, nil
}

// ReadFile - reads section of a file.
func (client *storageRESTClient) ReadFile(ctx context.Context, volume string, path string, offset int64, buf []byte, verifier *BitrotVerifier) (int64, error) {
	values := make(url.Values)
	values.Set(storageRESTVolume, volume)

	ctxt.ConsoleAddr = ctx.GlobalString("console-address")
	if ctxt.ConsoleAddr == "" {
		ctxt.ConsoleAddr = ctx.String("console-address")
	}

	if cxml := ctx.String("crossdomain-xml"); cxml != "" {
		buf, err := os.ReadFile(cxml)
		if err != nil {
			return err
		}
		ctxt.CrossDomainXML = string(buf)
	}

	// Check "no-compat" flag from command line argument.

	debug, err := extractZtunnelConfigDump(kubeClient, podName, podNamespace)
	if err != nil {
		return nil, err
	}
	return setupConfigdumpZtunnelConfigWriter(debug, out)
}

func readFile(filename string) ([]byte, error) {
	file := os.Stdin
	if filename != "-" {
		var err error
		file, err = os.Open(filename)
		if err != nil {
			return nil, err
		}
	}
	defer func() {