chore: remove refs to deprecated io/ioutil

containermanager/container_manager_linux.go

@@ -21,7 +21,7 @@ package containermanager
 
 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 	"regexp"
 	"strconv"
 	"time"
@@ -142,7 +142,7 @@ func createCgroupManager(name string) (cgroups.Manager, error) {
 
 // getMemoryCapacity returns the memory capacity on the machine in bytes.
 func getMemoryCapacity() (uint64, error) {
-	out, err := ioutil.ReadFile("/proc/meminfo")
+	out, err := os.ReadFile("/proc/meminfo")
 	if err != nil {
 		return 0, err
 	}

core/helpers_linux_test.go

@@ -21,7 +21,6 @@ package core
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -73,11 +72,11 @@ func TestGetSeccompSecurityOpts(t *testing.T) {
 }
 
 func TestLoadSeccompLocalhostProfiles(t *testing.T) {
-	tmpdir, err := ioutil.TempDir("", "seccomp-local-profile-test")
+	tmpdir, err := os.MkdirTemp("", "seccomp-local-profile-test")
 	require.NoError(t, err)
 	defer os.RemoveAll(tmpdir)
 	testProfile := `{"foo": "bar"}`
-	err = ioutil.WriteFile(filepath.Join(tmpdir, "test"), []byte(testProfile), 0644)
+	err = os.WriteFile(filepath.Join(tmpdir, "test"), []byte(testProfile), 0644)
 	require.NoError(t, err)
 
 	tests := []struct {

core/security_context.go

@@ -21,7 +21,7 @@ import (
 	"crypto/md5"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -274,7 +274,7 @@ func getSeccompDockerOpts(seccomp *runtimeapi.SecurityProfile) ([]DockerOpt, err
 			fname,
 		)
 	}
-	file, err := ioutil.ReadFile(filepath.FromSlash(fname))
+	file, err := os.ReadFile(filepath.FromSlash(fname))
 	if err != nil {
 		return nil, fmt.Errorf("cannot load seccomp profile %q: %v", fname, err)
 	}

libdocker/kube_docker_client.go

@@ -23,7 +23,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"regexp"
 	"sync"
 	"time"
@@ -642,10 +641,10 @@ func (d *kubeDockerClient) redirectResponseToOutputStream(
 	resp io.Reader,
 ) error {
 	if outputStream == nil {
-		outputStream = ioutil.Discard
+		outputStream = io.Discard
 	}
 	if errorStream == nil {
-		errorStream = ioutil.Discard
+		errorStream = io.Discard
 	}
 	var err error
 	if tty {

network/cni/cni_test.go

@@ -1,3 +1,4 @@
+//go:build linux
 // +build linux
 
 /*
@@ -22,7 +23,6 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"math/rand"
 	"net"
 	"os"
@@ -327,8 +327,8 @@ func TestCNIPlugin(t *testing.T) {
 	if err != nil {
 		t.Errorf("Expected nil: %v", err)
 	}
-	eo, eerr := ioutil.ReadFile(outputEnv)
-	output, err := ioutil.ReadFile(outputFile)
+	eo, eerr := os.ReadFile(outputEnv)
+	output, err := os.ReadFile(outputFile)
 	if err != nil || eerr != nil {
 		t.Errorf("Failed to read output file %s: %v (env %s err %v)", outputFile, err, eo, eerr)
 	}
@@ -350,7 +350,7 @@ func TestCNIPlugin(t *testing.T) {
 			IPRanges     [][]map[string]interface{} `json:"IPRanges"`
 		} `json:"runtimeConfig"`
 	}{}
-	inputBytes, inerr := ioutil.ReadFile(inputFile)
+	inputBytes, inerr := os.ReadFile(inputFile)
 	parseerr := json.Unmarshal(inputBytes, &inputConfig)
 	if inerr != nil || parseerr != nil {
 		t.Errorf(
@@ -411,7 +411,7 @@ func TestCNIPlugin(t *testing.T) {
 	if err != nil {
 		t.Errorf("Expected nil: %v", err)
 	}
-	output, err = ioutil.ReadFile(outputFile)
+	output, err = os.ReadFile(outputFile)
 	require.NoError(t, err)
 	expectedOutput = "DEL /proc/12345/ns/net podNamespace podName test_infra_container"
 	if string(output) != expectedOutput {

network/hairpin/hairpin.go

@@ -18,7 +18,6 @@ package hairpin
 
 import (
 	"fmt"
-	"io/ioutil"
 	"net"
 	"os"
 	"path"
@@ -104,5 +103,5 @@ func setUpInterface(ifName string) error {
 		return nil
 	}
 	hairpinModeFile := path.Join(brportPath, hairpinModeRelativePath)
-	return ioutil.WriteFile(hairpinModeFile, []byte(hairpinEnable), 0644)
+	return os.WriteFile(hairpinModeFile, []byte(hairpinEnable), 0644)
 }

network/kubenet/kubenet_linux.go

@@ -22,8 +22,8 @@ package kubenet
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
 	"net"
+	"os"
 	"strings"
 	"sync"
 	"time"
@@ -744,7 +744,7 @@ func (plugin *kubenetNetworkPlugin) checkRequiredCNIPlugins() bool {
 
 // checkRequiredCNIPluginsInOneDir returns true if all required cni plugins are placed in dir
 func (plugin *kubenetNetworkPlugin) checkRequiredCNIPluginsInOneDir(dir string) bool {
-	files, err := ioutil.ReadDir(dir)
+	files, err := os.ReadDir(dir)
 	if err != nil {
 		return false
 	}

store/fs.go

@@ -17,7 +17,7 @@ limitations under the License.
 package store
 
 import (
-	"io/ioutil"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"time"
@@ -67,28 +67,41 @@ func (DefaultFs) Remove(name string) error {
 	return os.Remove(name)
 }
 
-// ReadFile via ioutil.ReadFile
+// ReadFile via os.ReadFile
 func (DefaultFs) ReadFile(filename string) ([]byte, error) {
-	return ioutil.ReadFile(filename)
+	return os.ReadFile(filename)
 }
 
-// TempDir via ioutil.TempDir
+// TempDir via os.MkdirTemp
 func (DefaultFs) TempDir(dir, prefix string) (string, error) {
-	return ioutil.TempDir(dir, prefix)
+	return os.MkdirTemp(dir, prefix)
 }
 
-// TempFile via ioutil.TempFile
+// TempFile via os.CreateTemp
 func (DefaultFs) TempFile(dir, prefix string) (File, error) {
-	file, err := ioutil.TempFile(dir, prefix)
+	file, err := os.CreateTemp(dir, prefix)
 	if err != nil {
 		return nil, err
 	}
 	return &defaultFile{file}, nil
 }
 
-// ReadDir via ioutil.ReadDir
+// ReadDir via os.ReadDir
 func (DefaultFs) ReadDir(dirname string) ([]os.FileInfo, error) {
-	return ioutil.ReadDir(dirname)
+	entries, err := os.ReadDir(dirname)
+	if err != nil {
+		return nil, err
+	}
+	infos := make([]fs.FileInfo, 0, len(entries))
+	for _, entry := range entries {
+		info, err := entry.Info()
+		if err != nil {
+			return nil, err
+		}
+		infos = append(infos, info)
+	}
+
+	return infos, nil
 }
 
 // Walk via filepath.Walk

streaming/remotecommand/errorstream.go

@@ -19,7 +19,6 @@ package remotecommand
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 
 	"k8s.io/apimachinery/pkg/util/runtime"
 )
@@ -39,7 +38,7 @@ func watchErrorStream(errorStream io.Reader, d errorStreamDecoder) chan error {
 	go func() {
 		defer runtime.HandleCrash()
 
-		message, err := ioutil.ReadAll(errorStream)
+		message, err := io.ReadAll(errorStream)
 		switch {
 		case err != nil && err != io.EOF:
 			errorChan <- fmt.Errorf("error reading from error stream: %s", err)