remove io/ioutil for advanced golang

Signed-off-by: yanggang <gang.yang@daocloud.io>

cmd/helm/create_test.go

@@ -18,7 +18,6 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -77,7 +76,7 @@ func TestCreateStarterCmd(t *testing.T) {
 		t.Logf("Created %s", dest)
 	}
 	tplpath := filepath.Join(starterchart, "starterchart", "templates", "foo.tpl")
-	if err := ioutil.WriteFile(tplpath, []byte("test"), 0644); err != nil {
+	if err := os.WriteFile(tplpath, []byte("test"), 0644); err != nil {
 		t.Fatalf("Could not write template: %s", err)
 	}
 
@@ -140,7 +139,7 @@ func TestCreateStarterAbsoluteCmd(t *testing.T) {
 		t.Logf("Created %s", dest)
 	}
 	tplpath := filepath.Join(starterchart, "starterchart", "templates", "foo.tpl")
-	if err := ioutil.WriteFile(tplpath, []byte("test"), 0644); err != nil {
+	if err := os.WriteFile(tplpath, []byte("test"), 0644); err != nil {
 		t.Fatalf("Could not write template: %s", err)
 	}
 

cmd/helm/helm.go

@@ -18,7 +18,7 @@ package main // import "helm.sh/helm/v3/cmd/helm"
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"os"
 	"strings"
@@ -106,10 +106,10 @@ func loadReleasesInMemory(actionConfig *action.Configuration) {
 		return
 	}
 
-	actionConfig.KubeClient = &kubefake.PrintingKubeClient{Out: ioutil.Discard}
+	actionConfig.KubeClient = &kubefake.PrintingKubeClient{Out: io.Discard}
 
 	for _, path := range filePaths {
-		b, err := ioutil.ReadFile(path)
+		b, err := os.ReadFile(path)
 		if err != nil {
 			log.Fatal("Unable to read memory driver data", err)
 		}

cmd/helm/helm_test.go

@@ -18,7 +18,7 @@ package main
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"os"
 	"os/exec"
 	"runtime"
@@ -92,7 +92,7 @@ func executeActionCommandStdinC(store *storage.Storage, in *os.File, cmd string)
 
 	actionConfig := &action.Configuration{
 		Releases:     store,
-		KubeClient:   &kubefake.PrintingKubeClient{Out: ioutil.Discard},
+		KubeClient:   &kubefake.PrintingKubeClient{Out: io.Discard},
 		Capabilities: chartutil.DefaultCapabilities,
 		Log:          func(format string, v ...interface{}) {},
 	}

cmd/helm/load_plugins.go

@@ -19,7 +19,6 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
@@ -311,7 +310,7 @@ func addPluginCommands(plugin *plugin.Plugin, baseCmd *cobra.Command, cmds *plug
 // loadFile takes a yaml file at the given path, parses it and returns a pluginCommand object
 func loadFile(path string) (*pluginCommand, error) {
 	cmds := new(pluginCommand)
-	b, err := ioutil.ReadFile(path)
+	b, err := os.ReadFile(path)
 	if err != nil {
 		return cmds, fmt.Errorf("file (%s) not provided by plugin. No plugin auto-completion possible", path)
 	}

cmd/helm/package.go

@@ -19,7 +19,6 @@ package main
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -87,7 +86,7 @@ func newPackageCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {
 
 				if client.DependencyUpdate {
 					downloadManager := &downloader.Manager{
-						Out:              ioutil.Discard,
+						Out:              io.Discard,
 						ChartPath:        path,
 						Keyring:          client.Keyring,
 						Getters:          p,

cmd/helm/registry_login.go

@@ -21,7 +21,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"strings"
 
@@ -74,7 +73,7 @@ func getUsernamePassword(usernameOpt string, passwordOpt string, passwordFromStd
 	password := passwordOpt
 
 	if passwordFromStdinOpt {
-		passwordFromStdin, err := ioutil.ReadAll(os.Stdin)
+		passwordFromStdin, err := io.ReadAll(os.Stdin)
 		if err != nil {
 			return "", "", err
 		}

cmd/helm/repo_add.go

@@ -20,7 +20,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -134,7 +133,7 @@ func (o *repoAddOptions) run(out io.Writer) error {
 		return err
 	}
 
-	b, err := ioutil.ReadFile(o.repoFile)
+	b, err := os.ReadFile(o.repoFile)
 	if err != nil && !os.IsNotExist(err) {
 		return err
 	}

cmd/helm/repo_add_test.go

@@ -18,7 +18,7 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"os"
 	"path/filepath"
 	"strings"
@@ -102,7 +102,7 @@ func TestRepoAdd(t *testing.T) {
 	}
 	os.Setenv(xdg.CacheHomeEnvVar, rootDir)
 
-	if err := o.run(ioutil.Discard); err != nil {
+	if err := o.run(io.Discard); err != nil {
 		t.Error(err)
 	}
 
@@ -126,11 +126,11 @@ func TestRepoAdd(t *testing.T) {
 
 	o.forceUpdate = true
 
-	if err := o.run(ioutil.Discard); err != nil {
+	if err := o.run(io.Discard); err != nil {
 		t.Errorf("Repository was not updated: %s", err)
 	}
 
-	if err := o.run(ioutil.Discard); err != nil {
+	if err := o.run(io.Discard); err != nil {
 		t.Errorf("Duplicate repository name was added")
 	}
 }
@@ -159,7 +159,7 @@ func TestRepoAddCheckLegalName(t *testing.T) {
 
 	wantErrorMsg := fmt.Sprintf("repository name (%s) contains '/', please specify a different name without '/'", testRepoName)
 
-	if err := o.run(ioutil.Discard); err != nil {
+	if err := o.run(io.Discard); err != nil {
 		if wantErrorMsg != err.Error() {
 			t.Fatalf("Actual error %s, not equal to expected error %s", err, wantErrorMsg)
 		}
@@ -211,14 +211,14 @@ func repoAddConcurrent(t *testing.T, testName, repoFile string) {
 				forceUpdate:        false,
 				repoFile:           repoFile,
 			}
-			if err := o.run(ioutil.Discard); err != nil {
+			if err := o.run(io.Discard); err != nil {
 				t.Error(err)
 			}
 		}(fmt.Sprintf("%s-%d", testName, i))
 	}
 	wg.Wait()
 
-	b, err := ioutil.ReadFile(repoFile)
+	b, err := os.ReadFile(repoFile)
 	if err != nil {
 		t.Error(err)
 	}

cmd/helm/repo_update_test.go

@@ -19,7 +19,6 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -119,7 +118,7 @@ func TestUpdateCustomCacheCmd(t *testing.T) {
 		repoFile:  filepath.Join(ts.Root(), "repositories.yaml"),
 		repoCache: cachePath,
 	}
-	b := ioutil.Discard
+	b := io.Discard
 	if err := o.run(b); err != nil {
 		t.Fatal(err)
 	}

cmd/helm/require/args_test.go

@@ -17,7 +17,7 @@ package require
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"strings"
 	"testing"
 
@@ -71,7 +71,7 @@ func runTestCases(t *testing.T, testCases []testCase) {
 				Args: tc.validateFunc,
 			}
 			cmd.SetArgs(tc.args)
-			cmd.SetOutput(ioutil.Discard)
+			cmd.SetOutput(io.Discard)
 
 			err := cmd.Execute()
 			if tc.wantError == "" {

cmd/helm/search_repo.go

@@ -21,7 +21,6 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -259,7 +258,7 @@ func compListChartsOfRepo(repoName string, prefix string) []string {
 	var charts []string
 
 	path := filepath.Join(settings.RepositoryCache, helmpath.CacheChartsFile(repoName))
-	content, err := ioutil.ReadFile(path)
+	content, err := os.ReadFile(path)
 	if err == nil {
 		scanner := bufio.NewScanner(bytes.NewReader(content))
 		for scanner.Scan() {

cmd/helm/upgrade_test.go

@@ -18,7 +18,6 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -359,7 +358,7 @@ func TestUpgradeInstallWithValuesFromStdin(t *testing.T) {
 
 func prepareMockRelease(releaseName string, t *testing.T) (func(n string, v int, ch *chart.Chart) *release.Release, *chart.Chart, string) {
 	tmpChart := ensure.TempDir(t)
-	configmapData, err := ioutil.ReadFile("testdata/testcharts/upgradetest/templates/configmap.yaml")
+	configmapData, err := os.ReadFile("testdata/testcharts/upgradetest/templates/configmap.yaml")
 	if err != nil {
 		t.Fatalf("Error loading template yaml %v", err)
 	}

internal/fileutil/fileutil.go

@@ -18,7 +18,6 @@ package fileutil
 
 import (
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -28,7 +27,7 @@ import (
 // AtomicWriteFile atomically (as atomic as os.Rename allows) writes a file to a
 // disk.
 func AtomicWriteFile(filename string, reader io.Reader, mode os.FileMode) error {
-	tempFile, err := ioutil.TempFile(filepath.Split(filename))
+	tempFile, err := os.CreateTemp(filepath.Split(filename))
 	if err != nil {
 		return err
 	}

internal/fileutil/fileutil_test.go

@@ -18,7 +18,6 @@ package fileutil
 
 import (
 	"bytes"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -37,7 +36,7 @@ func TestAtomicWriteFile(t *testing.T) {
 		t.Errorf("AtomicWriteFile error: %s", err)
 	}
 
-	got, err := ioutil.ReadFile(testpath)
+	got, err := os.ReadFile(testpath)
 	if err != nil {
 		t.Fatal(err)
 	}

internal/test/ensure/ensure.go

@@ -17,7 +17,6 @@ limitations under the License.
 package ensure
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -44,7 +43,7 @@ func HelmHome(t *testing.T) func() {
 // TempDir ensures a scratch test directory for unit testing purposes.
 func TempDir(t *testing.T) string {
 	t.Helper()
-	d, err := ioutil.TempDir("", "helm")
+	d, err := os.MkdirTemp("", "helm")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -63,7 +62,7 @@ func TempDir(t *testing.T) string {
 func TempFile(t *testing.T, name string, data []byte) string {
 	path := TempDir(t)
 	filename := filepath.Join(path, name)
-	if err := ioutil.WriteFile(filename, data, 0755); err != nil {
+	if err := os.WriteFile(filename, data, 0755); err != nil {
 		t.Fatal(err)
 	}
 	return path

internal/test/test.go

@@ -19,7 +19,7 @@ package test
 import (
 	"bytes"
 	"flag"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 
 	"github.com/pkg/errors"
@@ -53,7 +53,7 @@ func AssertGoldenString(t TestingT, actual, filename string) {
 func AssertGoldenFile(t TestingT, actualFileName string, expectedFilename string) {
 	t.Helper()
 
-	actual, err := ioutil.ReadFile(actualFileName)
+	actual, err := os.ReadFile(actualFileName)
 	if err != nil {
 		t.Fatalf("%v", err)
 	}
@@ -73,7 +73,7 @@ func compare(actual []byte, filename string) error {
 		return err
 	}
 
-	expected, err := ioutil.ReadFile(filename)
+	expected, err := os.ReadFile(filename)
 	if err != nil {
 		return errors.Wrapf(err, "unable to read testdata %s", filename)
 	}
@@ -88,7 +88,7 @@ func update(filename string, in []byte) error {
 	if !*updateGolden {
 		return nil
 	}
-	return ioutil.WriteFile(filename, normalize(in), 0666)
+	return os.WriteFile(filename, normalize(in), 0666)
 }
 
 func normalize(in []byte) []byte {

internal/third_party/dep/fs/fs_test.go

@@ -32,7 +32,6 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 package fs
 
 import (
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -137,7 +136,7 @@ func TestCopyDir(t *testing.T) {
 			t.Fatalf("expected %s to be a directory", dn)
 		}
 
-		got, err := ioutil.ReadFile(fn)
+		got, err := os.ReadFile(fn)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -337,7 +336,7 @@ func TestCopyFile(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	got, err := ioutil.ReadFile(destf)
+	got, err := os.ReadFile(destf)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -396,11 +395,11 @@ func TestCopyFileSymlink(t *testing.T) {
 				// Creating symlinks on Windows require an additional permission
 				// regular users aren't granted usually. So we copy the file
 				// content as a fall back instead of creating a real symlink.
-				srcb, err := ioutil.ReadFile(symlink)
+				srcb, err := os.ReadFile(symlink)
 				if err != nil {
 					t.Fatalf("%+v", err)
 				}
-				dstb, err := ioutil.ReadFile(dst)
+				dstb, err := os.ReadFile(dst)
 				if err != nil {
 					t.Fatalf("%+v", err)
 				}

internal/tlsutil/tls.go

@@ -19,7 +19,7 @@ package tlsutil
 import (
 	"crypto/tls"
 	"crypto/x509"
-	"io/ioutil"
+	"os"
 
 	"github.com/pkg/errors"
 )
@@ -52,7 +52,7 @@ func NewClientTLS(certFile, keyFile, caFile string) (*tls.Config, error) {
 // Returns an error if the file could not be read, a certificate could not
 // be parsed, or if the file does not contain any certificates
 func CertPoolFromFile(filename string) (*x509.CertPool, error) {
-	b, err := ioutil.ReadFile(filename)
+	b, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, errors.Errorf("can't read CA file: %v", filename)
 	}

pkg/action/action_test.go

@@ -17,7 +17,7 @@ package action
 
 import (
 	"flag"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	fakeclientset "k8s.io/client-go/kubernetes/fake"
@@ -44,7 +44,7 @@ func actionConfigFixture(t *testing.T) *Configuration {
 
 	return &Configuration{
 		Releases:       storage.Init(driver.NewMemory()),
-		KubeClient:     &kubefake.FailingKubeClient{PrintingKubeClient: kubefake.PrintingKubeClient{Out: ioutil.Discard}},
+		KubeClient:     &kubefake.FailingKubeClient{PrintingKubeClient: kubefake.PrintingKubeClient{Out: io.Discard}},
 		Capabilities:   chartutil.DefaultCapabilities,
 		RegistryClient: registryClient,
 		Log: func(format string, v ...interface{}) {

pkg/action/install.go

@@ -20,7 +20,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/url"
 	"os"
 	"path"
@@ -221,7 +221,7 @@ func (i *Install) RunWithContext(ctx context.Context, chrt *chart.Chart, vals ma
 			i.cfg.Capabilities.KubeVersion = *i.KubeVersion
 		}
 		i.cfg.Capabilities.APIVersions = append(i.cfg.Capabilities.APIVersions, i.APIVersions...)
-		i.cfg.KubeClient = &kubefake.PrintingKubeClient{Out: ioutil.Discard}
+		i.cfg.KubeClient = &kubefake.PrintingKubeClient{Out: io.Discard}
 
 		mem := driver.NewMemory()
 		mem.SetNamespace(i.Namespace)

pkg/action/install_test.go

@@ -19,7 +19,7 @@ package action
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -132,7 +132,7 @@ func TestInstallReleaseClientOnly(t *testing.T) {
 	instAction.Run(buildChart(), nil) // disregard output
 
 	is.Equal(instAction.cfg.Capabilities, chartutil.DefaultCapabilities)
-	is.Equal(instAction.cfg.KubeClient, &kubefake.PrintingKubeClient{Out: ioutil.Discard})
+	is.Equal(instAction.cfg.KubeClient, &kubefake.PrintingKubeClient{Out: io.Discard})
 }
 
 func TestInstallRelease_NoName(t *testing.T) {

pkg/action/lint.go

@@ -17,7 +17,6 @@ limitations under the License.
 package action
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -91,7 +90,7 @@ func lintChart(path string, vals map[string]interface{}, namespace string, stric
 	linter := support.Linter{}
 
 	if strings.HasSuffix(path, ".tgz") || strings.HasSuffix(path, ".tar.gz") {
-		tempDir, err := ioutil.TempDir("", "helm-lint")
+		tempDir, err := os.MkdirTemp("", "helm-lint")
 		if err != nil {
 			return linter, errors.Wrap(err, "unable to create temp dir to extract tarball")
 		}

pkg/action/package.go

@@ -19,7 +19,6 @@ package action
 import (
 	"bufio"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"syscall"
 
@@ -137,7 +136,7 @@ func (p *Package) Clearsign(filename string) error {
 		return err
 	}
 
-	return ioutil.WriteFile(filename+".prov", []byte(sig), 0644)
+	return os.WriteFile(filename+".prov", []byte(sig), 0644)
 }
 
 // promptUser implements provenance.PassphraseFetcher

pkg/action/package_test.go

@@ -17,7 +17,6 @@ limitations under the License.
 package action
 
 import (
-	"io/ioutil"
 	"os"
 	"path"
 	"testing"
@@ -71,7 +70,7 @@ func TestPassphraseFileFetcher_WithInvalidStdin(t *testing.T) {
 	directory := ensure.TempDir(t)
 	defer os.RemoveAll(directory)
 
-	stdin, err := ioutil.TempFile(directory, "non-existing")
+	stdin, err := os.CreateTemp(directory, "non-existing")
 	if err != nil {
 		t.Fatal("Unable to create test file", err)
 	}

pkg/action/pull.go

@@ -18,7 +18,6 @@ package action
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -108,7 +107,7 @@ func (p *Pull) Run(chartRef string) (string, error) {
 	dest := p.DestDir
 	if p.Untar {
 		var err error
-		dest, err = ioutil.TempDir("", "helm-")
+		dest, err = os.MkdirTemp("", "helm-")
 		if err != nil {
 			return out.String(), errors.Wrap(err, "failed to untar")
 		}

pkg/chart/loader/directory.go

@@ -19,7 +19,6 @@ package loader
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -102,7 +101,7 @@ func LoadDir(dir string) (*chart.Chart, error) {
 			return fmt.Errorf("cannot load irregular file %s as it has file mode type bits set", name)
 		}
 
-		data, err := ioutil.ReadFile(name)
+		data, err := os.ReadFile(name)
 		if err != nil {
 			return errors.Wrapf(err, "error reading %s", n)
 		}

pkg/chart/loader/load_test.go

@@ -21,7 +21,6 @@ import (
 	"bytes"
 	"compress/gzip"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -90,13 +89,13 @@ func TestLoadDirWithSymlink(t *testing.T) {
 func TestBomTestData(t *testing.T) {
 	testFiles := []string{"frobnitz_with_bom/.helmignore", "frobnitz_with_bom/templates/template.tpl", "frobnitz_with_bom/Chart.yaml"}
 	for _, file := range testFiles {
-		data, err := ioutil.ReadFile("testdata/" + file)
+		data, err := os.ReadFile("testdata/" + file)
 		if err != nil || !bytes.HasPrefix(data, utf8bom) {
 			t.Errorf("Test file has no BOM or is invalid: testdata/%s", file)
 		}
 	}
 
-	archive, err := ioutil.ReadFile("testdata/frobnitz_with_bom.tgz")
+	archive, err := os.ReadFile("testdata/frobnitz_with_bom.tgz")
 	if err != nil {
 		t.Fatalf("Error reading archive frobnitz_with_bom.tgz: %s", err)
 	}

pkg/chartutil/chartfile.go

@@ -17,7 +17,6 @@ limitations under the License.
 package chartutil
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -29,7 +28,7 @@ import (
 
 // LoadChartfile loads a Chart.yaml file into a *chart.Metadata.
 func LoadChartfile(filename string) (*chart.Metadata, error) {
-	b, err := ioutil.ReadFile(filename)
+	b, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, err
 	}
@@ -55,7 +54,7 @@ func SaveChartfile(filename string, cf *chart.Metadata) error {
 	if err != nil {
 		return err
 	}
-	return ioutil.WriteFile(filename, out, 0644)
+	return os.WriteFile(filename, out, 0644)
 }
 
 // IsChartDir validate a chart directory.
@@ -73,7 +72,7 @@ func IsChartDir(dirName string) (bool, error) {
 		return false, errors.Errorf("no %s exists in directory %q", ChartfileName, dirName)
 	}
 
-	chartYamlContent, err := ioutil.ReadFile(chartYaml)
+	chartYamlContent, err := os.ReadFile(chartYaml)
 	if err != nil {
 		return false, errors.Errorf("cannot read %s in directory %q", ChartfileName, dirName)
 	}

pkg/chartutil/create.go

@@ -19,7 +19,6 @@ package chartutil
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -673,7 +672,7 @@ func writeFile(name string, content []byte) error {
 	if err := os.MkdirAll(filepath.Dir(name), 0755); err != nil {
 		return err
 	}
-	return ioutil.WriteFile(name, content, 0644)
+	return os.WriteFile(name, content, 0644)
 }
 
 func validateChartName(name string) error {

pkg/chartutil/create_test.go

@@ -18,7 +18,6 @@ package chartutil
 
 import (
 	"bytes"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -100,7 +99,7 @@ func TestCreateFrom(t *testing.T) {
 		}
 
 		// Check each file to make sure <CHARTNAME> has been replaced
-		b, err := ioutil.ReadFile(filepath.Join(dir, f))
+		b, err := os.ReadFile(filepath.Join(dir, f))
 		if err != nil {
 			t.Errorf("Unable to read file %s: %s", f, err)
 		}
@@ -131,7 +130,7 @@ func TestCreate_Overwrite(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	data, err := ioutil.ReadFile(tplname)
+	data, err := os.ReadFile(tplname)
 	if err != nil {
 		t.Fatal(err)
 	}

pkg/chartutil/expand.go

@@ -18,7 +18,6 @@ package chartutil
 
 import (
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -72,7 +71,7 @@ func Expand(dir string, r io.Reader) error {
 			return err
 		}
 
-		if err := ioutil.WriteFile(outpath, file.Data, 0644); err != nil {
+		if err := os.WriteFile(outpath, file.Data, 0644); err != nil {
 			return err
 		}
 	}

pkg/chartutil/jsonschema_test.go

@@ -17,7 +17,7 @@ limitations under the License.
 package chartutil
 
 import (
-	"io/ioutil"
+	"os"
 	"testing"
 
 	"helm.sh/helm/v3/pkg/chart"
@@ -28,7 +28,7 @@ func TestValidateAgainstSingleSchema(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Error reading YAML file: %s", err)
 	}
-	schema, err := ioutil.ReadFile("./testdata/test-values.schema.json")
+	schema, err := os.ReadFile("./testdata/test-values.schema.json")
 	if err != nil {
 		t.Fatalf("Error reading YAML file: %s", err)
 	}
@@ -43,7 +43,7 @@ func TestValidateAgainstSingleSchemaNegative(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Error reading YAML file: %s", err)
 	}
-	schema, err := ioutil.ReadFile("./testdata/test-values.schema.json")
+	schema, err := os.ReadFile("./testdata/test-values.schema.json")
 	if err != nil {
 		t.Fatalf("Error reading YAML file: %s", err)
 	}

pkg/chartutil/values.go

@@ -19,7 +19,7 @@ package chartutil
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
+	"os"
 	"strings"
 
 	"github.com/pkg/errors"
@@ -114,7 +114,7 @@ func ReadValues(data []byte) (vals Values, err error) {
 
 // ReadValuesFile will parse a YAML file into a map of values.
 func ReadValuesFile(filename string) (Values, error) {
-	data, err := ioutil.ReadFile(filename)
+	data, err := os.ReadFile(filename)
 	if err != nil {
 		return map[string]interface{}{}, err
 	}

pkg/cli/values/options.go

@@ -17,7 +17,7 @@ limitations under the License.
 package values
 
 import (
-	"io/ioutil"
+	"io"
 	"net/url"
 	"os"
 	"strings"
@@ -118,7 +118,7 @@ func mergeMaps(a, b map[string]interface{}) map[string]interface{} {
 // readFile load a file from stdin, the local directory, or a remote file with a url.
 func readFile(filePath string, p getter.Providers) ([]byte, error) {
 	if strings.TrimSpace(filePath) == "-" {
-		return ioutil.ReadAll(os.Stdin)
+		return io.ReadAll(os.Stdin)
 	}
 	u, err := url.Parse(filePath)
 	if err != nil {
@@ -128,7 +128,7 @@ func readFile(filePath string, p getter.Providers) ([]byte, error) {
 	// FIXME: maybe someone handle other protocols like ftp.
 	g, err := p.ByScheme(u.Scheme)
 	if err != nil {
-		return ioutil.ReadFile(filePath)
+		return os.ReadFile(filePath)
 	}
 	data, err := g.Get(filePath, getter.WithURL(filePath))
 	if err != nil {

pkg/downloader/manager.go

@@ -20,7 +20,6 @@ import (
 	"encoding/hex"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"net/url"
 	"os"
@@ -845,7 +844,7 @@ func writeLock(chartpath string, lock *chart.Lock, legacyLockfile bool) error {
 		lockfileName = "requirements.lock"
 	}
 	dest := filepath.Join(chartpath, lockfileName)
-	return ioutil.WriteFile(dest, data, 0644)
+	return os.WriteFile(dest, data, 0644)
 }
 
 // archive a dep chart from local directory and save it into destPath

pkg/kube/client_test.go

@@ -19,7 +19,6 @@ package kube
 import (
 	"bytes"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"strings"
 	"testing"
@@ -37,7 +36,7 @@ var unstructuredSerializer = resource.UnstructuredPlusDefaultContentConfig().Neg
 var codec = scheme.Codecs.LegacyCodec(scheme.Scheme.PrioritizedVersionsAllGroups()...)
 
 func objBody(obj runtime.Object) io.ReadCloser {
-	return ioutil.NopCloser(bytes.NewReader([]byte(runtime.EncodeOrDie(codec, obj))))
+	return io.NopCloser(bytes.NewReader([]byte(runtime.EncodeOrDie(codec, obj))))
 }
 
 func newPod(name string) v1.Pod {
@@ -87,7 +86,7 @@ func notFoundBody() *metav1.Status {
 func newResponse(code int, obj runtime.Object) (*http.Response, error) {
 	header := http.Header{}
 	header.Set("Content-Type", runtime.ContentTypeJSON)
-	body := ioutil.NopCloser(bytes.NewReader([]byte(runtime.EncodeOrDie(codec, obj))))
+	body := io.NopCloser(bytes.NewReader([]byte(runtime.EncodeOrDie(codec, obj))))
 	return &http.Response{StatusCode: code, Header: header, Body: body}, nil
 }
 
@@ -123,7 +122,7 @@ func TestUpdate(t *testing.T) {
 			case p == "/namespaces/default/pods/otter" && m == "GET":
 				return newResponse(200, &listA.Items[1])
 			case p == "/namespaces/default/pods/otter" && m == "PATCH":
-				data, err := ioutil.ReadAll(req.Body)
+				data, err := io.ReadAll(req.Body)
 				if err != nil {
 					t.Fatalf("could not dump request: %s", err)
 				}
@@ -136,7 +135,7 @@ func TestUpdate(t *testing.T) {
 			case p == "/namespaces/default/pods/dolphin" && m == "GET":
 				return newResponse(404, notFoundBody())
 			case p == "/namespaces/default/pods/starfish" && m == "PATCH":
-				data, err := ioutil.ReadAll(req.Body)
+				data, err := io.ReadAll(req.Body)
 				if err != nil {
 					t.Fatalf("could not dump request: %s", err)
 				}

pkg/lint/rules/chartfile.go

@@ -18,7 +18,6 @@ package rules // import "helm.sh/helm/v3/pkg/lint/rules"
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -200,7 +199,7 @@ func validateChartType(cf *chart.Metadata) error {
 // in a generic form of a map[string]interface{}, so that the type
 // of the values can be checked
 func loadChartFileForTypeCheck(filename string) (map[string]interface{}, error) {
-	b, err := ioutil.ReadFile(filename)
+	b, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, err
 	}

pkg/lint/rules/values.go

@@ -17,7 +17,6 @@ limitations under the License.
 package rules
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -76,7 +75,7 @@ func validateValuesFile(valuesPath string, overrides map[string]interface{}) err
 
 	ext := filepath.Ext(valuesPath)
 	schemaPath := valuesPath[:len(valuesPath)-len(ext)] + ".schema.json"
-	schema, err := ioutil.ReadFile(schemaPath)
+	schema, err := os.ReadFile(schemaPath)
 	if len(schema) == 0 {
 		return nil
 	}

pkg/lint/rules/values_test.go

@@ -17,7 +17,6 @@ limitations under the License.
 package rules
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -168,7 +167,7 @@ func TestValidateValuesFile(t *testing.T) {
 func createTestingSchema(t *testing.T, dir string) string {
 	t.Helper()
 	schemafile := filepath.Join(dir, "values.schema.json")
-	if err := ioutil.WriteFile(schemafile, []byte(testSchema), 0700); err != nil {
+	if err := os.WriteFile(schemafile, []byte(testSchema), 0700); err != nil {
 		t.Fatalf("Failed to write schema to tmpdir: %s", err)
 	}
 	return schemafile

pkg/plugin/installer/local_installer_test.go

@@ -16,7 +16,6 @@ limitations under the License.
 package installer // import "helm.sh/helm/v3/pkg/plugin/installer"
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -29,7 +28,7 @@ var _ Installer = new(LocalInstaller)
 func TestLocalInstaller(t *testing.T) {
 	// Make a temp dir
 	tdir := t.TempDir()
-	if err := ioutil.WriteFile(filepath.Join(tdir, "plugin.yaml"), []byte{}, 0644); err != nil {
+	if err := os.WriteFile(filepath.Join(tdir, "plugin.yaml"), []byte{}, 0644); err != nil {
 		t.Fatal(err)
 	}
 

pkg/plugin/plugin.go

@@ -17,7 +17,6 @@ package plugin // import "helm.sh/helm/v3/pkg/plugin"
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -216,7 +215,7 @@ func detectDuplicates(plugs []*Plugin) error {
 // LoadDir loads a plugin from the given directory.
 func LoadDir(dirname string) (*Plugin, error) {
 	pluginfile := filepath.Join(dirname, PluginFileName)
-	data, err := ioutil.ReadFile(pluginfile)
+	data, err := os.ReadFile(pluginfile)
 	if err != nil {
 		return nil, errors.Wrapf(err, "failed to read plugin at %q", pluginfile)
 	}

pkg/postrender/exec_test.go

@@ -18,7 +18,6 @@ package postrender
 
 import (
 	"bytes"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -167,7 +166,7 @@ func setupTestingScript(t *testing.T) (filepath string, cleanup func()) {
 
 	tempdir := ensure.TempDir(t)
 
-	f, err := ioutil.TempFile(tempdir, "post-render-test.sh")
+	f, err := os.CreateTemp(tempdir, "post-render-test.sh")
 	if err != nil {
 		t.Fatalf("unable to create tempfile for testing: %s", err)
 	}

pkg/provenance/sign.go

@@ -20,7 +20,6 @@ import (
 	"crypto"
 	"encoding/hex"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -293,7 +292,7 @@ func (s *Signatory) Verify(chartpath, sigpath string) (*Verification, error) {
 }
 
 func (s *Signatory) decodeSignature(filename string) (*clearsign.Block, error) {
-	data, err := ioutil.ReadFile(filename)
+	data, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, err
 	}

pkg/provenance/sign_test.go

@@ -19,7 +19,6 @@ import (
 	"crypto"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -277,7 +276,7 @@ func TestDecodeSignature(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	f, err := ioutil.TempFile("", "helm-test-sig-")
+	f, err := os.CreateTemp("", "helm-test-sig-")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -334,7 +333,7 @@ func TestVerify(t *testing.T) {
 
 // readSumFile reads a file containing a sum generated by the UNIX shasum tool.
 func readSumFile(sumfile string) (string, error) {
-	data, err := ioutil.ReadFile(sumfile)
+	data, err := os.ReadFile(sumfile)
 	if err != nil {
 		return "", err
 	}

pkg/pusher/ocipusher.go

@@ -17,7 +17,6 @@ package pusher
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path"
 	"strings"
@@ -60,7 +59,7 @@ func (pusher *OCIPusher) push(chartRef, href string) error {
 
 	client := pusher.opts.registryClient
 
-	chartBytes, err := ioutil.ReadFile(chartRef)
+	chartBytes, err := os.ReadFile(chartRef)
 	if err != nil {
 		return err
 	}
@@ -68,7 +67,7 @@ func (pusher *OCIPusher) push(chartRef, href string) error {
 	var pushOpts []registry.PushOption
 	provRef := fmt.Sprintf("%s.prov", chartRef)
 	if _, err := os.Stat(provRef); err == nil {
-		provBytes, err := ioutil.ReadFile(provRef)
+		provBytes, err := os.ReadFile(provRef)
 		if err != nil {
 			return err
 		}

pkg/registry/client.go

@@ -21,7 +21,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"sort"
 	"strings"
@@ -71,7 +70,7 @@ type (
 // NewClient returns a new registry client with config
 func NewClient(options ...ClientOption) (*Client, error) {
 	client := &Client{
-		out: ioutil.Discard,
+		out: io.Discard,
 	}
 	for _, option := range options {
 		option(client)

pkg/registry/client_test.go

@@ -21,7 +21,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -80,7 +79,7 @@ func (suite *RegistryClientTestSuite) SetupSuite() {
 	pwBytes, err := bcrypt.GenerateFromPassword([]byte(testPassword), bcrypt.DefaultCost)
 	suite.Nil(err, "no error generating bcrypt password for test htpasswd file")
 	htpasswdPath := filepath.Join(suite.WorkspaceDir, testHtpasswdFileBasename)
-	err = ioutil.WriteFile(htpasswdPath, []byte(fmt.Sprintf("%s:%s\n", testUsername, string(pwBytes))), 0644)
+	err = os.WriteFile(htpasswdPath, []byte(fmt.Sprintf("%s:%s\n", testUsername, string(pwBytes))), 0644)
 	suite.Nil(err, "no error creating test htpasswd file")
 
 	// Registry config
@@ -139,7 +138,7 @@ func (suite *RegistryClientTestSuite) Test_1_Push() {
 	suite.NotNil(err, "error pushing non-chart bytes")
 
 	// Load a test chart
-	chartData, err := ioutil.ReadFile("../repo/repotest/testdata/examplechart-0.1.0.tgz")
+	chartData, err := os.ReadFile("../repo/repotest/testdata/examplechart-0.1.0.tgz")
 	suite.Nil(err, "no error loading test chart")
 	meta, err := extractChartMeta(chartData)
 	suite.Nil(err, "no error extracting chart meta")
@@ -163,7 +162,7 @@ func (suite *RegistryClientTestSuite) Test_1_Push() {
 	suite.Nil(err, "no error pushing non-strict ref (bad tag), with strict mode disabled")
 
 	// basic push, good ref
-	chartData, err = ioutil.ReadFile("../downloader/testdata/local-subchart-0.1.0.tgz")
+	chartData, err = os.ReadFile("../downloader/testdata/local-subchart-0.1.0.tgz")
 	suite.Nil(err, "no error loading test chart")
 	meta, err = extractChartMeta(chartData)
 	suite.Nil(err, "no error extracting chart meta")
@@ -175,13 +174,13 @@ func (suite *RegistryClientTestSuite) Test_1_Push() {
 	suite.Nil(err, "no error pulling a simple chart")
 
 	// Load another test chart
-	chartData, err = ioutil.ReadFile("../downloader/testdata/signtest-0.1.0.tgz")
+	chartData, err = os.ReadFile("../downloader/testdata/signtest-0.1.0.tgz")
 	suite.Nil(err, "no error loading test chart")
 	meta, err = extractChartMeta(chartData)
 	suite.Nil(err, "no error extracting chart meta")
 
 	// Load prov file
-	provData, err := ioutil.ReadFile("../downloader/testdata/signtest-0.1.0.tgz.prov")
+	provData, err := os.ReadFile("../downloader/testdata/signtest-0.1.0.tgz.prov")
 	suite.Nil(err, "no error loading test prov")
 
 	// push with prov
@@ -223,7 +222,7 @@ func (suite *RegistryClientTestSuite) Test_2_Pull() {
 	suite.NotNil(err, "error on bad/missing ref")
 
 	// Load test chart (to build ref pushed in previous test)
-	chartData, err := ioutil.ReadFile("../downloader/testdata/local-subchart-0.1.0.tgz")
+	chartData, err := os.ReadFile("../downloader/testdata/local-subchart-0.1.0.tgz")
 	suite.Nil(err, "no error loading test chart")
 	meta, err := extractChartMeta(chartData)
 	suite.Nil(err, "no error extracting chart meta")
@@ -245,14 +244,14 @@ func (suite *RegistryClientTestSuite) Test_2_Pull() {
 		"no error pulling a chart with prov when no prov exists, ignoring missing")
 
 	// Load test chart (to build ref pushed in previous test)
-	chartData, err = ioutil.ReadFile("../downloader/testdata/signtest-0.1.0.tgz")
+	chartData, err = os.ReadFile("../downloader/testdata/signtest-0.1.0.tgz")
 	suite.Nil(err, "no error loading test chart")
 	meta, err = extractChartMeta(chartData)
 	suite.Nil(err, "no error extracting chart meta")
 	ref = fmt.Sprintf("%s/testrepo/%s:%s", suite.DockerRegistryHost, meta.Name, meta.Version)
 
 	// Load prov file
-	provData, err := ioutil.ReadFile("../downloader/testdata/signtest-0.1.0.tgz.prov")
+	provData, err := os.ReadFile("../downloader/testdata/signtest-0.1.0.tgz.prov")
 	suite.Nil(err, "no error loading test prov")
 
 	// no chart and no prov causes error
@@ -298,7 +297,7 @@ func (suite *RegistryClientTestSuite) Test_2_Pull() {
 func (suite *RegistryClientTestSuite) Test_3_Tags() {
 
 	// Load test chart (to build ref pushed in previous test)
-	chartData, err := ioutil.ReadFile("../downloader/testdata/local-subchart-0.1.0.tgz")
+	chartData, err := os.ReadFile("../downloader/testdata/local-subchart-0.1.0.tgz")
 	suite.Nil(err, "no error loading test chart")
 	meta, err := extractChartMeta(chartData)
 	suite.Nil(err, "no error extracting chart meta")

pkg/repo/chartrepo.go

@@ -21,7 +21,7 @@ import (
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/url"
 	"os"
@@ -136,7 +136,7 @@ func (r *ChartRepository) DownloadIndexFile() (string, error) {
 		return "", err
 	}
 
-	index, err := ioutil.ReadAll(resp)
+	index, err := io.ReadAll(resp)
 	if err != nil {
 		return "", err
 	}
@@ -153,12 +153,12 @@ func (r *ChartRepository) DownloadIndexFile() (string, error) {
 	}
 	chartsFile := filepath.Join(r.CachePath, helmpath.CacheChartsFile(r.Config.Name))
 	os.MkdirAll(filepath.Dir(chartsFile), 0755)
-	ioutil.WriteFile(chartsFile, []byte(charts.String()), 0644)
+	os.WriteFile(chartsFile, []byte(charts.String()), 0644)
 
 	// Create the index file in the cache directory
 	fname := filepath.Join(r.CachePath, helmpath.CacheIndexFile(r.Config.Name))
 	os.MkdirAll(filepath.Dir(fname), 0755)
-	return fname, ioutil.WriteFile(fname, index, 0644)
+	return fname, os.WriteFile(fname, index, 0644)
 }
 
 // Index generates an index for the chart repository and writes an index.yaml file.
@@ -175,7 +175,7 @@ func (r *ChartRepository) saveIndexFile() error {
 	if err != nil {
 		return err
 	}
-	return ioutil.WriteFile(filepath.Join(r.Config.Name, indexPath), index, 0644)
+	return os.WriteFile(filepath.Join(r.Config.Name, indexPath), index, 0644)
 }
 
 func (r *ChartRepository) generateIndex() error {

pkg/repo/chartrepo_test.go

@@ -18,7 +18,6 @@ package repo
 
 import (
 	"bytes"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -151,7 +150,7 @@ func TestIndexCustomSchemeDownload(t *testing.T) {
 	repo.CachePath = ensure.TempDir(t)
 	defer os.RemoveAll(repo.CachePath)
 
-	tempIndexFile, err := ioutil.TempFile("", "test-repo")
+	tempIndexFile, err := os.CreateTemp("", "test-repo")
 	if err != nil {
 		t.Fatalf("Failed to create temp index file: %v", err)
 	}
@@ -266,7 +265,7 @@ func verifyIndex(t *testing.T, actual *IndexFile) {
 // startLocalServerForTests Start the local helm server
 func startLocalServerForTests(handler http.Handler) (*httptest.Server, error) {
 	if handler == nil {
-		fileBytes, err := ioutil.ReadFile("testdata/local-index.yaml")
+		fileBytes, err := os.ReadFile("testdata/local-index.yaml")
 		if err != nil {
 			return nil, err
 		}
@@ -281,7 +280,7 @@ func startLocalServerForTests(handler http.Handler) (*httptest.Server, error) {
 // startLocalTLSServerForTests Start the local helm server with TLS
 func startLocalTLSServerForTests(handler http.Handler) (*httptest.Server, error) {
 	if handler == nil {
-		fileBytes, err := ioutil.ReadFile("testdata/local-index.yaml")
+		fileBytes, err := os.ReadFile("testdata/local-index.yaml")
 		if err != nil {
 			return nil, err
 		}

pkg/repo/index.go

@@ -18,7 +18,6 @@ package repo
 
 import (
 	"bytes"
-	"io/ioutil"
 	"log"
 	"os"
 	"path"
@@ -104,7 +103,7 @@ func NewIndexFile() *IndexFile {
 
 // LoadIndexFile takes a file at the given path and returns an IndexFile object
 func LoadIndexFile(path string) (*IndexFile, error) {
-	b, err := ioutil.ReadFile(path)
+	b, err := os.ReadFile(path)
 	if err != nil {
 		return nil, err
 	}

pkg/repo/index_test.go

@@ -19,7 +19,6 @@ package repo
 import (
 	"bufio"
 	"bytes"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -258,7 +257,7 @@ func TestDownloadIndexFile(t *testing.T) {
 			t.Fatalf("error finding created charts file: %#v", err)
 		}
 
-		b, err := ioutil.ReadFile(idx)
+		b, err := os.ReadFile(idx)
 		if err != nil {
 			t.Fatalf("error reading charts file: %#v", err)
 		}
@@ -267,7 +266,7 @@ func TestDownloadIndexFile(t *testing.T) {
 
 	t.Run("should not decode the path in the repo url while downloading index", func(t *testing.T) {
 		chartRepoURLPath := "/some%2Fpath/test"
-		fileBytes, err := ioutil.ReadFile("testdata/local-index.yaml")
+		fileBytes, err := os.ReadFile("testdata/local-index.yaml")
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -311,7 +310,7 @@ func TestDownloadIndexFile(t *testing.T) {
 			t.Fatalf("error finding created charts file: %#v", err)
 		}
 
-		b, err := ioutil.ReadFile(idx)
+		b, err := os.ReadFile(idx)
 		if err != nil {
 			t.Fatalf("error reading charts file: %#v", err)
 		}
@@ -518,7 +517,7 @@ func TestIndexWrite(t *testing.T) {
 	testpath := filepath.Join(dir, "test")
 	i.WriteFile(testpath, 0600)
 
-	got, err := ioutil.ReadFile(testpath)
+	got, err := os.ReadFile(testpath)
 	if err != nil {
 		t.Fatal(err)
 	}

pkg/repo/repo.go

@@ -17,7 +17,6 @@ limitations under the License.
 package repo // import "helm.sh/helm/v3/pkg/repo"
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"time"
@@ -47,7 +46,7 @@ func NewFile() *File {
 // LoadFile takes a file at the given path and returns a File object
 func LoadFile(path string) (*File, error) {
 	r := new(File)
-	b, err := ioutil.ReadFile(path)
+	b, err := os.ReadFile(path)
 	if err != nil {
 		return r, errors.Wrapf(err, "couldn't load repositories file (%s)", path)
 	}
@@ -119,5 +118,5 @@ func (r *File) WriteFile(path string, perm os.FileMode) error {
 	if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
 		return err
 	}
-	return ioutil.WriteFile(path, data, perm)
+	return os.WriteFile(path, data, perm)
 }

pkg/repo/repo_test.go

@@ -17,7 +17,6 @@ limitations under the License.
 package repo
 
 import (
-	"io/ioutil"
 	"os"
 	"strings"
 	"testing"
@@ -198,7 +197,7 @@ func TestWriteFile(t *testing.T) {
 		},
 	)
 
-	file, err := ioutil.TempFile("", "helm-repo")
+	file, err := os.CreateTemp("", "helm-repo")
 	if err != nil {
 		t.Errorf("failed to create test-file (%v)", err)
 	}

pkg/repo/repotest/server.go

@@ -18,7 +18,6 @@ package repotest
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -102,7 +101,7 @@ func NewOCIServer(t *testing.T, dir string) (*OCIServer, error) {
 		t.Fatal("error generating bcrypt password for test htpasswd file")
 	}
 	htpasswdPath := filepath.Join(dir, testHtpasswdFileBasename)
-	err = ioutil.WriteFile(htpasswdPath, []byte(fmt.Sprintf("%s:%s\n", testUsername, string(pwBytes))), 0644)
+	err = os.WriteFile(htpasswdPath, []byte(fmt.Sprintf("%s:%s\n", testUsername, string(pwBytes))), 0644)
 	if err != nil {
 		t.Fatalf("error creating test htpasswd file")
 	}
@@ -194,7 +193,7 @@ func (srv *OCIServer) Run(t *testing.T, opts ...OCIServerOpt) {
 	}
 
 	// load it into memory...
-	contentBytes, err := ioutil.ReadFile(absPath)
+	contentBytes, err := os.ReadFile(absPath)
 	if err != nil {
 		t.Fatal("could not load chart into memory")
 	}
@@ -222,7 +221,7 @@ func (srv *OCIServer) Run(t *testing.T, opts ...OCIServerOpt) {
 	// load it into memory...
 	absPath = filepath.Join(srv.Dir,
 		fmt.Sprintf("%s-%s.tgz", c.Metadata.Name, c.Metadata.Version))
-	contentBytes, err = ioutil.ReadFile(absPath)
+	contentBytes, err = os.ReadFile(absPath)
 	if err != nil {
 		t.Fatal("could not load chart into memory")
 	}
@@ -249,7 +248,7 @@ func (srv *OCIServer) Run(t *testing.T, opts ...OCIServerOpt) {
 //
 // Deprecated: use NewTempServerWithCleanup
 func NewTempServer(glob string) (*Server, error) {
-	tdir, err := ioutil.TempDir("", "helm-repotest-")
+	tdir, err := os.MkdirTemp("", "helm-repotest-")
 	if err != nil {
 		return nil, err
 	}
@@ -317,11 +316,11 @@ func (s *Server) CopyCharts(origin string) ([]string, error) {
 	for i, f := range files {
 		base := filepath.Base(f)
 		newname := filepath.Join(s.docroot, base)
-		data, err := ioutil.ReadFile(f)
+		data, err := os.ReadFile(f)
 		if err != nil {
 			return []string{}, err
 		}
-		if err := ioutil.WriteFile(newname, data, 0644); err != nil {
+		if err := os.WriteFile(newname, data, 0644); err != nil {
 			return []string{}, err
 		}
 		copied[i] = newname
@@ -345,7 +344,7 @@ func (s *Server) CreateIndex() error {
 	}
 
 	ifile := filepath.Join(s.docroot, "index.yaml")
-	return ioutil.WriteFile(ifile, d, 0644)
+	return os.WriteFile(ifile, d, 0644)
 }
 
 func (s *Server) Start() {

pkg/repo/repotest/server_test.go

@@ -16,7 +16,7 @@ limitations under the License.
 package repotest
 
 import (
-	"io/ioutil"
+	"io"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -68,7 +68,7 @@ func TestServer(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	data, err := ioutil.ReadAll(res.Body)
+	data, err := io.ReadAll(res.Body)
 	res.Body.Close()
 	if err != nil {
 		t.Fatal(err)

pkg/storage/driver/util.go

@@ -21,7 +21,7 @@ import (
 	"compress/gzip"
 	"encoding/base64"
 	"encoding/json"
-	"io/ioutil"
+	"io"
 
 	rspb "helm.sh/helm/v3/pkg/release"
 )
@@ -69,7 +69,7 @@ func decodeRelease(data string) (*rspb.Release, error) {
 			return nil, err
 		}
 		defer r.Close()
-		b2, err := ioutil.ReadAll(r)
+		b2, err := io.ReadAll(r)
 		if err != nil {
 			return nil, err
 		}

pkg/strvals/parser.go

@@ -20,7 +20,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"strconv"
 	"strings"
 	"unicode"
@@ -228,7 +227,7 @@ func (t *parser) key(data map[string]interface{}) (reterr error) {
 					return err
 				}
 				set(data, string(k), jsonval)
-				if _, err = io.CopyN(ioutil.Discard, t.sc, dec.InputOffset()); err != nil {
+				if _, err = io.CopyN(io.Discard, t.sc, dec.InputOffset()); err != nil {
 					return err
 				}
 				// skip possible blanks and comma
@@ -354,7 +353,7 @@ func (t *parser) listItem(list []interface{}, i int) ([]interface{}, error) {
 			if list, err = setIndex(list, i, jsonval); err != nil {
 				return list, err
 			}
-			if _, err = io.CopyN(ioutil.Discard, t.sc, dec.InputOffset()); err != nil {
+			if _, err = io.CopyN(io.Discard, t.sc, dec.InputOffset()); err != nil {
 				return list, err
 			}
 			// skip possible blanks and comma