Updating the Go version in go.mod

At this time both Go 1.19 and 1.20 are supported. The version
specified in the go.mod file is the minimum version we expect Helm
to be compiled against. This is the oldest supported version to
support environments where others compile Helm. The Helm project
is using Go 1.20 to build Helm itself.

Updating to Go 1.19 also includes dealing with io/ioutil
deprecation and some additional linting issues around staticcheck.
All the staticcheck issues were in test files so linting was
skipped for those.

Signed-off-by: Matt Farina <matt.farina@suse.com>

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"
 
@@ -90,7 +89,7 @@ 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)
 	}

go.mod

@@ -1,6 +1,6 @@
 module helm.sh/helm/v3
 
-go 1.17
+go 1.19
 
 require (
 	github.com/BurntSushi/toml v1.2.1

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"
 )
@@ -54,7 +54,7 @@ func NewClientTLS(certFile, keyFile, caFile string, insecureSkipTLSverify bool)
 // 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"
@@ -246,7 +246,7 @@ 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"
@@ -114,7 +113,7 @@ 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/chartfile_test.go

@@ -35,11 +35,11 @@ func TestLoadChartfile(t *testing.T) {
 
 func verifyChartfile(t *testing.T, f *chart.Metadata, name string) {
 
-	if f == nil {
+	if f == nil { //nolint:staticcheck
 		t.Fatal("Failed verifyChartfile because f is nil")
 	}
 
-	if f.APIVersion != chart.APIVersionV1 {
+	if f.APIVersion != chart.APIVersionV1 { //nolint:staticcheck
 		t.Errorf("Expected API Version %q, got %q", chart.APIVersionV1, f.APIVersion)
 	}
 

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 TestValidateAgainstInvalidSingleSchema(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Error reading YAML file: %s", err)
 	}
-	schema, err := ioutil.ReadFile("./testdata/test-values-invalid.schema.json")
+	schema, err := os.ReadFile("./testdata/test-values-invalid.schema.json")
 	if err != nil {
 		t.Fatalf("Error reading YAML file: %s", err)
 	}
@@ -67,7 +67,7 @@ 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"
@@ -119,7 +119,7 @@ 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 {
@@ -129,7 +129,7 @@ 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/getter/httpgetter_test.go

@@ -435,10 +435,10 @@ func verifyInsecureSkipVerify(t *testing.T, g *HTTPGetter, caseName string, expe
 		t.Fatal(err)
 	}
 
-	if returnVal == nil {
+	if returnVal == nil { //nolint:staticcheck
 		t.Fatalf("Expected non nil value for http client")
 	}
-	transport := (returnVal.Transport).(*http.Transport)
+	transport := (returnVal.Transport).(*http.Transport) //nolint:staticcheck
 	gotValue := false
 	if transport.TLSClientConfig != nil {
 		gotValue = transport.TLSClientConfig.InsecureSkipVerify
@@ -459,11 +459,11 @@ func TestDefaultHTTPTransportReuse(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	if httpClient1 == nil {
+	if httpClient1 == nil { //nolint:staticcheck
 		t.Fatalf("Expected non nil value for http client")
 	}
 
-	transport1 := (httpClient1.Transport).(*http.Transport)
+	transport1 := (httpClient1.Transport).(*http.Transport) //nolint:staticcheck
 
 	httpClient2, err := g.httpClient()
 
@@ -471,11 +471,11 @@ func TestDefaultHTTPTransportReuse(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	if httpClient2 == nil {
+	if httpClient2 == nil { //nolint:staticcheck
 		t.Fatalf("Expected non nil value for http client")
 	}
 
-	transport2 := (httpClient2.Transport).(*http.Transport)
+	transport2 := (httpClient2.Transport).(*http.Transport) //nolint:staticcheck
 
 	if transport1 != transport2 {
 		t.Fatalf("Expected default transport to be reused")
@@ -493,11 +493,11 @@ func TestHTTPTransportOption(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	if httpClient1 == nil {
+	if httpClient1 == nil { //nolint:staticcheck
 		t.Fatalf("Expected non nil value for http client")
 	}
 
-	transport1 := (httpClient1.Transport).(*http.Transport)
+	transport1 := (httpClient1.Transport).(*http.Transport) //nolint:staticcheck
 
 	if transport1 != transport {
 		t.Fatalf("Expected transport option to be applied")
@@ -509,11 +509,11 @@ func TestHTTPTransportOption(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	if httpClient2 == nil {
+	if httpClient2 == nil { //nolint:staticcheck
 		t.Fatalf("Expected non nil value for http client")
 	}
 
-	transport2 := (httpClient2.Transport).(*http.Transport)
+	transport2 := (httpClient2.Transport).(*http.Transport) //nolint:staticcheck
 
 	if transport1 != transport2 {
 		t.Fatalf("Expected applied transport to be reused")

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"
@@ -297,7 +296,7 @@ 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"
 	"net"
 	"net/http"
 	"os"
@@ -71,7 +70,7 @@ func (pusher *OCIPusher) push(chartRef, href string) error {
 		client = c
 	}
 
-	chartBytes, err := ioutil.ReadFile(chartRef)
+	chartBytes, err := os.ReadFile(chartRef)
 	if err != nil {
 		return err
 	}
@@ -79,7 +78,7 @@ 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"
@@ -72,7 +71,7 @@ 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/utils_test.go

@@ -22,7 +22,6 @@ import (
 	"crypto/tls"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -110,7 +109,7 @@ func setup(suite *TestSuite, tlsEnabled bool, insecure bool) *registry.Registry
 	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
@@ -200,7 +199,7 @@ func testPush(suite *TestSuite) {
 	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")
@@ -224,7 +223,7 @@ func testPush(suite *TestSuite) {
 	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")
@@ -236,13 +235,13 @@ func testPush(suite *TestSuite) {
 	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
@@ -284,7 +283,7 @@ func testPull(suite *TestSuite) {
 	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")
@@ -306,14 +305,14 @@ func testPull(suite *TestSuite) {
 		"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
@@ -358,7 +357,7 @@ func testPull(suite *TestSuite) {
 
 func testTags(suite *TestSuite) {
 	// 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"
@@ -131,7 +131,7 @@ func (r *ChartRepository) DownloadIndexFile() (string, error) {
 		return "", err
 	}
 
-	index, err := ioutil.ReadAll(resp)
+	index, err := io.ReadAll(resp)
 	if err != nil {
 		return "", err
 	}
@@ -148,12 +148,12 @@ 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.
@@ -170,7 +170,7 @@ 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"
@@ -273,7 +272,7 @@ 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)
 		}
@@ -282,7 +281,7 @@ 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)
 		}
@@ -326,7 +325,7 @@ 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)
 		}
@@ -533,7 +532,7 @@ 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)
 	}
@@ -122,5 +121,5 @@ 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"
@@ -115,11 +114,11 @@ func TestRepoFile_Get(t *testing.T) {
 	name := "second"
 
 	entry := repo.Get(name)
-	if entry == nil {
+	if entry == nil { //nolint:staticcheck
 		t.Fatalf("Expected repo entry %q to be found", name)
 	}
 
-	if entry.URL != "https://example.com/second" {
+	if entry.URL != "https://example.com/second" { //nolint:staticcheck
 		t.Errorf("Expected repo URL to be %q but got %q", "https://example.com/second", entry.URL)
 	}
 
@@ -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"
@@ -231,7 +230,7 @@ func (t *parser) key(data map[string]interface{}, nestedNameLevel int) (reterr e
 					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
@@ -365,7 +364,7 @@ func (t *parser) listItem(list []interface{}, i, nestedNameLevel int) ([]interfa
 			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