Merge pull request #3443 from thaJeztah/remove_ioutil

Remove uses of deprecated io/ioutil, and use new t.TempDir() and t.Cleanup() in tests

.golangci.yml

@@ -2,6 +2,7 @@ linters:
   enable:
     - bodyclose
     - deadcode
+    - depguard
     - dogsled
     - gocyclo
     - goimports
@@ -33,6 +34,13 @@ run:
     - .*generated.*
 
 linters-settings:
+  depguard:
+    list-type: blacklist
+    include-go-root: true
+    packages:
+      # The io/ioutil package has been deprecated.
+      # https://go.dev/doc/go1.16#ioutil
+      - io/ioutil
   gocyclo:
     min-complexity: 16
   govet:

cli-plugins/manager/manager.go

@@ -1,7 +1,6 @@
 package manager
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"sort"
@@ -57,12 +56,12 @@ func getPluginDirs(dockerCli command.Cli) ([]string, error) {
 }
 
 func addPluginCandidatesFromDir(res map[string][]string, d string) error {
-	dentries, err := ioutil.ReadDir(d)
+	dentries, err := os.ReadDir(d)
 	if err != nil {
 		return err
 	}
 	for _, dentry := range dentries {
-		switch dentry.Mode() & os.ModeType {
+		switch dentry.Type() & os.ModeType {
 		case 0, os.ModeSymlink:
 			// Regular file or symlink, keep going
 		default:

cli/command/checkpoint/create_test.go

@@ -1,7 +1,7 @@
 package checkpoint
 
 import (
-	"io/ioutil"
+	"io"
 	"strings"
 	"testing"
 
@@ -41,7 +41,7 @@ func TestCheckpointCreateErrors(t *testing.T) {
 		})
 		cmd := newCreateCommand(cli)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/checkpoint/list_test.go

@@ -1,7 +1,7 @@
 package checkpoint
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -41,7 +41,7 @@ func TestCheckpointListErrors(t *testing.T) {
 		})
 		cmd := newListCommand(cli)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/checkpoint/remove_test.go

@@ -1,7 +1,7 @@
 package checkpoint
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -40,7 +40,7 @@ func TestCheckpointRemoveErrors(t *testing.T) {
 		})
 		cmd := newRemoveCommand(cli)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/cli.go

@@ -3,7 +3,6 @@ package command
 import (
 	"context"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -275,7 +274,7 @@ func NewAPIClientFromFlags(opts *cliflags.CommonOptions, configFile *configfile.
 	store := &ContextStoreWithDefault{
 		Store: store.New(cliconfig.ContextStoreDir(), storeConfig),
 		Resolver: func() (*DefaultContext, error) {
-			return ResolveDefaultContext(opts, configFile, storeConfig, ioutil.Discard)
+			return ResolveDefaultContext(opts, configFile, storeConfig, io.Discard)
 		},
 	}
 	contextName, err := resolveContextName(opts, configFile, store)

cli/command/cli_test.go

@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -225,23 +225,23 @@ func TestNewDockerCliAndOperators(t *testing.T) {
 	outbuf := bytes.NewBuffer(nil)
 	errbuf := bytes.NewBuffer(nil)
 	err = cli.Apply(
-		WithInputStream(ioutil.NopCloser(inbuf)),
+		WithInputStream(io.NopCloser(inbuf)),
 		WithOutputStream(outbuf),
 		WithErrorStream(errbuf),
 	)
 	assert.NilError(t, err)
 	// Check input stream
-	inputStream, err := ioutil.ReadAll(cli.In())
+	inputStream, err := io.ReadAll(cli.In())
 	assert.NilError(t, err)
 	assert.Equal(t, string(inputStream), "input")
 	// Check output stream
 	fmt.Fprintf(cli.Out(), "output")
-	outputStream, err := ioutil.ReadAll(outbuf)
+	outputStream, err := io.ReadAll(outbuf)
 	assert.NilError(t, err)
 	assert.Equal(t, string(outputStream), "output")
 	// Check error stream
 	fmt.Fprintf(cli.Err(), "error")
-	errStream, err := ioutil.ReadAll(errbuf)
+	errStream, err := io.ReadAll(errbuf)
 	assert.NilError(t, err)
 	assert.Equal(t, string(errStream), "error")
 }

cli/command/config/create.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
@@ -61,7 +60,7 @@ func RunConfigCreate(dockerCli command.Cli, options CreateOptions) error {
 		defer file.Close()
 	}
 
-	configData, err := ioutil.ReadAll(in)
+	configData, err := io.ReadAll(in)
 	if err != nil {
 		return errors.Errorf("Error reading content from %q: %v", options.File, err)
 	}

cli/command/config/create_test.go

@@ -1,7 +1,8 @@
 package config
 
 import (
-	"io/ioutil"
+	"io"
+	"os"
 	"path/filepath"
 	"reflect"
 	"strings"
@@ -46,7 +47,7 @@ func TestConfigCreateErrors(t *testing.T) {
 			}),
 		)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }
@@ -82,7 +83,7 @@ func TestConfigCreateWithLabels(t *testing.T) {
 	}
 	name := "foo"
 
-	data, err := ioutil.ReadFile(filepath.Join("testdata", configDataFile))
+	data, err := os.ReadFile(filepath.Join("testdata", configDataFile))
 	assert.NilError(t, err)
 
 	expected := swarm.ConfigSpec{

cli/command/config/inspect_test.go

@@ -2,7 +2,7 @@ package config
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 	"time"
 
@@ -59,7 +59,7 @@ func TestConfigInspectErrors(t *testing.T) {
 		for key, value := range tc.flags {
 			cmd.Flags().Set(key, value)
 		}
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/config/ls_test.go

@@ -1,7 +1,7 @@
 package config
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 	"time"
 
@@ -40,7 +40,7 @@ func TestConfigListErrors(t *testing.T) {
 			}),
 		)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/config/remove_test.go

@@ -1,7 +1,7 @@
 package config
 
 import (
-	"io/ioutil"
+	"io"
 	"strings"
 	"testing"
 
@@ -36,7 +36,7 @@ func TestConfigRemoveErrors(t *testing.T) {
 			}),
 		)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }
@@ -73,7 +73,7 @@ func TestConfigRemoveContinueAfterError(t *testing.T) {
 
 	cmd := newConfigRemoveCommand(cli)
 	cmd.SetArgs(names)
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	assert.Error(t, cmd.Execute(), "error removing config: foo")
 	assert.Check(t, is.DeepEqual(names, removedConfigs))
 }

cli/command/container/attach_test.go

@@ -2,7 +2,7 @@ package container
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/cli"
@@ -71,7 +71,7 @@ func TestNewAttachCommandErrors(t *testing.T) {
 	}
 	for _, tc := range testCases {
 		cmd := NewAttachCommand(test.NewFakeCli(&fakeClient{inspectFunc: tc.containerInspectFunc}))
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}

cli/command/container/cp_test.go

@@ -2,7 +2,6 @@ package container
 
 import (
 	"io"
-	"io/ioutil"
 	"os"
 	"runtime"
 	"strings"
@@ -54,7 +53,7 @@ func TestRunCopyFromContainerToStdout(t *testing.T) {
 	fakeClient := &fakeClient{
 		containerCopyFromFunc: func(container, srcPath string) (io.ReadCloser, types.ContainerPathStat, error) {
 			assert.Check(t, is.Equal("container", container))
-			return ioutil.NopCloser(strings.NewReader(tarContent)), types.ContainerPathStat{}, nil
+			return io.NopCloser(strings.NewReader(tarContent)), types.ContainerPathStat{}, nil
 		},
 	}
 	options := copyOptions{source: "container:/path", destination: "-"}
@@ -84,7 +83,7 @@ func TestRunCopyFromContainerToFilesystem(t *testing.T) {
 	assert.Check(t, is.Equal("", cli.OutBuffer().String()))
 	assert.Check(t, is.Equal("", cli.ErrBuffer().String()))
 
-	content, err := ioutil.ReadFile(destDir.Join("file1"))
+	content, err := os.ReadFile(destDir.Join("file1"))
 	assert.NilError(t, err)
 	assert.Check(t, is.Equal("content\n", string(content)))
 }

cli/command/container/create_test.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"runtime"
 	"sort"
@@ -67,7 +66,7 @@ func TestCIDFileCloseWithWrite(t *testing.T) {
 	content := "id"
 	assert.NilError(t, file.Write(content))
 
-	actual, err := ioutil.ReadFile(path)
+	actual, err := os.ReadFile(path)
 	assert.NilError(t, err)
 	assert.Check(t, is.Equal(content, string(actual)))
 
@@ -130,7 +129,7 @@ func TestCreateContainerImagePullPolicy(t *testing.T) {
 			},
 			imageCreateFunc: func(parentReference string, options types.ImageCreateOptions) (io.ReadCloser, error) {
 				defer func() { pullCounter++ }()
-				return ioutil.NopCloser(strings.NewReader("")), nil
+				return io.NopCloser(strings.NewReader("")), nil
 			},
 			infoFunc: func() (types.Info, error) {
 				return types.Info{IndexServerAddress: "https://indexserver.example.com"}, nil
@@ -194,7 +193,7 @@ func TestNewCreateCommandWithContentTrustErrors(t *testing.T) {
 		}, test.EnableContentTrust)
 		cli.SetNotaryClient(tc.notaryFunc)
 		cmd := NewCreateCommand(cli)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		err := cmd.Execute()
 		assert.ErrorContains(t, err, tc.expectedError)
@@ -254,7 +253,7 @@ func TestNewCreateCommandWithWarnings(t *testing.T) {
 				},
 			})
 			cmd := NewCreateCommand(cli)
-			cmd.SetOut(ioutil.Discard)
+			cmd.SetOut(io.Discard)
 			cmd.SetArgs(tc.args)
 			err := cmd.Execute()
 			assert.NilError(t, err)
@@ -306,7 +305,7 @@ func TestCreateContainerWithProxyConfig(t *testing.T) {
 		},
 	})
 	cmd := NewCreateCommand(cli)
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	cmd.SetArgs([]string{"image:tag"})
 	err := cmd.Execute()
 	assert.NilError(t, err)

cli/command/container/exec_test.go

@@ -2,7 +2,7 @@ package container
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 	"os"
 	"testing"
 
@@ -267,7 +267,7 @@ func TestNewExecCommandErrors(t *testing.T) {
 	for _, tc := range testCases {
 		cli := test.NewFakeCli(&fakeClient{inspectFunc: tc.containerInspectFunc})
 		cmd := NewExecCommand(cli)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}

cli/command/container/export_test.go

@@ -2,7 +2,6 @@ package container
 
 import (
 	"io"
-	"io/ioutil"
 	"strings"
 	"testing"
 
@@ -17,11 +16,11 @@ func TestContainerExportOutputToFile(t *testing.T) {
 
 	cli := test.NewFakeCli(&fakeClient{
 		containerExportFunc: func(container string) (io.ReadCloser, error) {
-			return ioutil.NopCloser(strings.NewReader("bar")), nil
+			return io.NopCloser(strings.NewReader("bar")), nil
 		},
 	})
 	cmd := NewExportCommand(cli)
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	cmd.SetArgs([]string{"-o", dir.Join("foo"), "container"})
 	assert.NilError(t, cmd.Execute())
 
@@ -35,11 +34,11 @@ func TestContainerExportOutputToFile(t *testing.T) {
 func TestContainerExportOutputToIrregularFile(t *testing.T) {
 	cli := test.NewFakeCli(&fakeClient{
 		containerExportFunc: func(container string) (io.ReadCloser, error) {
-			return ioutil.NopCloser(strings.NewReader("foo")), nil
+			return io.NopCloser(strings.NewReader("foo")), nil
 		},
 	})
 	cmd := NewExportCommand(cli)
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	cmd.SetArgs([]string{"-o", "/dev/random", "container"})
 
 	err := cmd.Execute()

cli/command/container/list.go

@@ -2,7 +2,7 @@ package container
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
@@ -89,7 +89,7 @@ func buildContainerListOptions(opts *psOptions) (*types.ContainerListOptions, er
 
 		// This shouldn't error out but swallowing the error makes it harder
 		// to track down if preProcessor issues come up.
-		if err := tmpl.Execute(ioutil.Discard, optionsProcessor); err != nil {
+		if err := tmpl.Execute(io.Discard, optionsProcessor); err != nil {
 			return nil, errors.Wrap(err, "failed to execute template")
 		}
 

cli/command/container/list_test.go

@@ -2,7 +2,7 @@ package container
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/cli/config/configfile"
@@ -161,7 +161,7 @@ func TestContainerListErrors(t *testing.T) {
 		for key, value := range tc.flags {
 			cmd.Flags().Set(key, value)
 		}
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/container/logs_test.go

@@ -2,7 +2,6 @@ package container
 
 import (
 	"io"
-	"io/ioutil"
 	"strings"
 	"testing"
 
@@ -15,7 +14,7 @@ import (
 
 var logFn = func(expectedOut string) func(string, types.ContainerLogsOptions) (io.ReadCloser, error) {
 	return func(container string, opts types.ContainerLogsOptions) (io.ReadCloser, error) {
-		return ioutil.NopCloser(strings.NewReader(expectedOut)), nil
+		return io.NopCloser(strings.NewReader(expectedOut)), nil
 	}
 }
 

cli/command/container/opts.go

@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"path"
 	"reflect"
 	"regexp"
@@ -845,7 +845,7 @@ func parseSecurityOpts(securityOpts []string) ([]string, error) {
 			}
 		}
 		if con[0] == "seccomp" && con[1] != "unconfined" {
-			f, err := ioutil.ReadFile(con[1])
+			f, err := os.ReadFile(con[1])
 			if err != nil {
 				return securityOpts, errors.Errorf("opening seccomp profile (%s) failed: %v", con[1], err)
 			}

cli/command/container/opts_test.go

@@ -2,7 +2,7 @@ package container
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"os"
 	"runtime"
 	"strings"
@@ -58,7 +58,7 @@ func parseRun(args []string) (*container.Config, *container.HostConfig, *network
 
 func setupRunFlags() (*pflag.FlagSet, *containerOptions) {
 	flags := pflag.NewFlagSet("run", pflag.ContinueOnError)
-	flags.SetOutput(ioutil.Discard)
+	flags.SetOutput(io.Discard)
 	flags.Usage = nil
 	copts := addFlags(flags)
 	return flags, copts

cli/command/container/port_test.go

@@ -1,7 +1,7 @@
 package container
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -47,7 +47,7 @@ func TestNewPortCommandOutput(t *testing.T) {
 				},
 			}, test.EnableContentTrust)
 			cmd := NewPortCommand(cli)
-			cmd.SetErr(ioutil.Discard)
+			cmd.SetErr(io.Discard)
 			cmd.SetArgs([]string{"some_container", "80"})
 			err := cmd.Execute()
 			assert.NilError(t, err)

cli/command/container/rm_test.go

@@ -3,7 +3,7 @@ package container
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"sort"
 	"testing"
 
@@ -27,7 +27,7 @@ func TestRemoveForce(t *testing.T) {
 		Version: "1.36",
 	})
 	cmd := NewRmCommand(cli)
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 
 	t.Run("without force", func(t *testing.T) {
 		cmd.SetArgs([]string{"nosuchcontainer", "mycontainer"})

cli/command/container/run_test.go

@@ -2,7 +2,7 @@ package container
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -68,7 +68,7 @@ func TestRunCommandWithContentTrustErrors(t *testing.T) {
 		cli.SetNotaryClient(tc.notaryFunc)
 		cmd := NewRunCommand(cli)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		err := cmd.Execute()
 		assert.Assert(t, err != nil)
 		assert.Assert(t, is.Contains(cli.ErrBuffer().String(), tc.expectedError))

cli/command/context/create_test.go

@@ -2,8 +2,6 @@ package context
 
 import (
 	"fmt"
-	"io/ioutil"
-	"os"
 	"testing"
 
 	"github.com/docker/cli/cli/command"
@@ -14,9 +12,9 @@ import (
 	"gotest.tools/v3/assert"
 )
 
-func makeFakeCli(t *testing.T, opts ...func(*test.FakeCli)) (*test.FakeCli, func()) {
+func makeFakeCli(t *testing.T, opts ...func(*test.FakeCli)) *test.FakeCli {
-	dir, err := ioutil.TempDir("", t.Name())
+	t.Helper()
-	assert.NilError(t, err)
+	dir := t.TempDir()
 	storeConfig := store.NewConfig(
 		func() interface{} { return &command.DockerContext{} },
 		store.EndpointTypeGetter(docker.DockerEndpoint, func() interface{} { return &docker.EndpointMeta{} }),
@@ -40,15 +38,12 @@ func makeFakeCli(t *testing.T, opts ...func(*test.FakeCli)) (*test.FakeCli, func
 			}, nil
 		},
 	}
-	cleanup := func() {
-		os.RemoveAll(dir)
-	}
 	result := test.NewFakeCli(nil, opts...)
 	for _, o := range opts {
 		o(result)
 	}
 	result.SetContextStore(store)
-	return result, cleanup
+	return result
 }
 
 func withCliConfig(configFile *configfile.ConfigFile) func(*test.FakeCli) {
@@ -58,8 +53,7 @@ func withCliConfig(configFile *configfile.ConfigFile) func(*test.FakeCli) {
 }
 
 func TestCreate(t *testing.T) {
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 	assert.NilError(t, cli.ContextStore().CreateOrUpdate(store.Metadata{Name: "existing-context"}))
 	tests := []struct {
 		options     CreateOptions
@@ -115,8 +109,7 @@ func assertContextCreateLogging(t *testing.T, cli *test.FakeCli, n string) {
 }
 
 func TestCreateOrchestratorEmpty(t *testing.T) {
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 
 	err := RunCreate(cli, &CreateOptions{
 		Name:   "test",
@@ -144,8 +137,7 @@ func TestCreateFromContext(t *testing.T) {
 		},
 	}
 
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 	cli.ResetOutputBuffers()
 	assert.NilError(t, RunCreate(cli, &CreateOptions{
 		Name:        "original",
@@ -210,8 +202,7 @@ func TestCreateFromCurrent(t *testing.T) {
 		},
 	}
 
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 	cli.ResetOutputBuffers()
 	assert.NilError(t, RunCreate(cli, &CreateOptions{
 		Name:        "original",

cli/command/context/export-import_test.go

@@ -3,7 +3,7 @@ package context
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"os"
 	"path/filepath"
 	"testing"
@@ -13,12 +13,8 @@ import (
 )
 
 func TestExportImportWithFile(t *testing.T) {
-	contextDir, err := ioutil.TempDir("", t.Name()+"context")
+	contextFile := filepath.Join(t.TempDir(), "exported")
-	assert.NilError(t, err)
+	cli := makeFakeCli(t)
-	defer os.RemoveAll(contextDir)
-	contextFile := filepath.Join(contextDir, "exported")
-	cli, cleanup := makeFakeCli(t)
-	defer cleanup()
 	createTestContext(t, cli, "test")
 	cli.ErrBuffer().Reset()
 	assert.NilError(t, RunExport(cli, &ExportOptions{
@@ -43,8 +39,7 @@ func TestExportImportWithFile(t *testing.T) {
 }
 
 func TestExportImportPipe(t *testing.T) {
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 	createTestContext(t, cli, "test")
 	cli.ErrBuffer().Reset()
 	cli.OutBuffer().Reset()
@@ -53,7 +48,7 @@ func TestExportImportPipe(t *testing.T) {
 		Dest:        "-",
 	}))
 	assert.Equal(t, cli.ErrBuffer().String(), "")
-	cli.SetIn(streams.NewIn(ioutil.NopCloser(bytes.NewBuffer(cli.OutBuffer().Bytes()))))
+	cli.SetIn(streams.NewIn(io.NopCloser(bytes.NewBuffer(cli.OutBuffer().Bytes()))))
 	cli.OutBuffer().Reset()
 	cli.ErrBuffer().Reset()
 	assert.NilError(t, RunImport(cli, "test2", "-"))
@@ -71,14 +66,10 @@ func TestExportImportPipe(t *testing.T) {
 }
 
 func TestExportExistingFile(t *testing.T) {
-	contextDir, err := ioutil.TempDir("", t.Name()+"context")
+	contextFile := filepath.Join(t.TempDir(), "exported")
-	assert.NilError(t, err)
+	cli := makeFakeCli(t)
-	defer os.RemoveAll(contextDir)
-	contextFile := filepath.Join(contextDir, "exported")
-	cli, cleanup := makeFakeCli(t)
-	defer cleanup()
 	cli.ErrBuffer().Reset()
-	assert.NilError(t, ioutil.WriteFile(contextFile, []byte{}, 0644))
+	assert.NilError(t, os.WriteFile(contextFile, []byte{}, 0644))
-	err = RunExport(cli, &ExportOptions{ContextName: "test", Dest: contextFile})
+	err := RunExport(cli, &ExportOptions{ContextName: "test", Dest: contextFile})
 	assert.Assert(t, os.IsExist(err))
 }

cli/command/context/inspect_test.go

@@ -9,8 +9,7 @@ import (
 )
 
 func TestInspect(t *testing.T) {
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 	createTestContext(t, cli, "current")
 	cli.OutBuffer().Reset()
 	assert.NilError(t, runInspect(cli, inspectOptions{

cli/command/context/list_test.go

@@ -20,8 +20,7 @@ func createTestContext(t *testing.T, cli command.Cli, name string) {
 }
 
 func TestList(t *testing.T) {
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 	createTestContext(t, cli, "current")
 	createTestContext(t, cli, "other")
 	createTestContext(t, cli, "unset")
@@ -32,8 +31,7 @@ func TestList(t *testing.T) {
 }
 
 func TestListQuiet(t *testing.T) {
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 	createTestContext(t, cli, "current")
 	createTestContext(t, cli, "other")
 	cli.SetCurrentContext("current")

cli/command/context/remove_test.go

@@ -1,8 +1,6 @@
 package context
 
 import (
-	"io/ioutil"
-	"os"
 	"path/filepath"
 	"testing"
 
@@ -13,8 +11,7 @@ import (
 )
 
 func TestRemove(t *testing.T) {
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 	createTestContext(t, cli, "current")
 	createTestContext(t, cli, "other")
 	assert.NilError(t, RunRemove(cli, RemoveOptions{}, []string{"other"}))
@@ -25,8 +22,7 @@ func TestRemove(t *testing.T) {
 }
 
 func TestRemoveNotAContext(t *testing.T) {
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 	createTestContext(t, cli, "current")
 	createTestContext(t, cli, "other")
 	err := RunRemove(cli, RemoveOptions{}, []string{"not-a-context"})
@@ -34,8 +30,7 @@ func TestRemoveNotAContext(t *testing.T) {
 }
 
 func TestRemoveCurrent(t *testing.T) {
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 	createTestContext(t, cli, "current")
 	createTestContext(t, cli, "other")
 	cli.SetCurrentContext("current")
@@ -44,16 +39,13 @@ func TestRemoveCurrent(t *testing.T) {
 }
 
 func TestRemoveCurrentForce(t *testing.T) {
-	configDir, err := ioutil.TempDir("", t.Name()+"config")
+	configDir := t.TempDir()
-	assert.NilError(t, err)
-	defer os.RemoveAll(configDir)
 	configFilePath := filepath.Join(configDir, "config.json")
 	testCfg := configfile.New(configFilePath)
 	testCfg.CurrentContext = "current"
 	assert.NilError(t, testCfg.Save())
 
-	cli, cleanup := makeFakeCli(t, withCliConfig(testCfg))
+	cli := makeFakeCli(t, withCliConfig(testCfg))
-	defer cleanup()
 	createTestContext(t, cli, "current")
 	createTestContext(t, cli, "other")
 	cli.SetCurrentContext("current")
@@ -64,8 +56,7 @@ func TestRemoveCurrentForce(t *testing.T) {
 }
 
 func TestRemoveDefault(t *testing.T) {
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 	createTestContext(t, cli, "other")
 	cli.SetCurrentContext("current")
 	err := RunRemove(cli, RemoveOptions{}, []string{"default"})

cli/command/context/update_test.go

@@ -10,8 +10,7 @@ import (
 )
 
 func TestUpdateDescriptionOnly(t *testing.T) {
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 	err := RunCreate(cli, &CreateOptions{
 		Name:   "test",
 		Docker: map[string]string{},
@@ -34,8 +33,7 @@ func TestUpdateDescriptionOnly(t *testing.T) {
 }
 
 func TestUpdateDockerOnly(t *testing.T) {
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 	createTestContext(t, cli, "test")
 	assert.NilError(t, RunUpdate(cli, &UpdateOptions{
 		Name: "test",
@@ -53,8 +51,7 @@ func TestUpdateDockerOnly(t *testing.T) {
 }
 
 func TestUpdateInvalidDockerHost(t *testing.T) {
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 	err := RunCreate(cli, &CreateOptions{
 		Name:   "test",
 		Docker: map[string]string{},

cli/command/context/use_test.go

@@ -1,8 +1,6 @@
 package context
 
 import (
-	"io/ioutil"
-	"os"
 	"path/filepath"
 	"testing"
 
@@ -13,14 +11,11 @@ import (
 )
 
 func TestUse(t *testing.T) {
-	configDir, err := ioutil.TempDir("", t.Name()+"config")
+	configDir := t.TempDir()
-	assert.NilError(t, err)
-	defer os.RemoveAll(configDir)
 	configFilePath := filepath.Join(configDir, "config.json")
 	testCfg := configfile.New(configFilePath)
-	cli, cleanup := makeFakeCli(t, withCliConfig(testCfg))
+	cli := makeFakeCli(t, withCliConfig(testCfg))
-	defer cleanup()
+	err := RunCreate(cli, &CreateOptions{
-	err = RunCreate(cli, &CreateOptions{
 		Name:   "test",
 		Docker: map[string]string{},
 	})
@@ -42,8 +37,7 @@ func TestUse(t *testing.T) {
 }
 
 func TestUseNoExist(t *testing.T) {
-	cli, cleanup := makeFakeCli(t)
+	cli := makeFakeCli(t)
-	defer cleanup()
 	err := newUseCommand(cli).RunE(nil, []string{"test"})
 	assert.Check(t, store.IsErrContextDoesNotExist(err))
 }

cli/command/defaultcontextstore_test.go

@@ -2,8 +2,6 @@ package command
 
 import (
 	"crypto/rand"
-	"io/ioutil"
-	"os"
 	"testing"
 
 	"github.com/docker/cli/cli/config/configfile"
@@ -39,11 +37,10 @@ func testDefaultMetadata() store.Metadata {
 	}
 }
 
-func testStore(t *testing.T, meta store.Metadata, tls store.ContextTLSData) (store.Store, func()) {
+func testStore(t *testing.T, meta store.Metadata, tls store.ContextTLSData) store.Store {
-	testDir, err := ioutil.TempDir("", t.Name())
+	t.Helper()
-	assert.NilError(t, err)
+	return &ContextStoreWithDefault{
-	s := &ContextStoreWithDefault{
+		Store: store.New(t.TempDir(), testCfg),
-		Store: store.New(testDir, testCfg),
 		Resolver: func() (*DefaultContext, error) {
 			return &DefaultContext{
 				Meta: meta,
@@ -51,9 +48,6 @@ func testStore(t *testing.T, meta store.Metadata, tls store.ContextTLSData) (sto
 			}, nil
 		},
 	}
-	return s, func() {
-		_ = os.RemoveAll(testDir)
-	}
 }
 
 func TestDefaultContextInitializer(t *testing.T) {
@@ -78,7 +72,7 @@ func TestExportDefaultImport(t *testing.T) {
 	rand.Read(file1)
 	file2 := make([]byte, 3700)
 	rand.Read(file2)
-	s, cleanup := testStore(t, testDefaultMetadata(), store.ContextTLSData{
+	s := testStore(t, testDefaultMetadata(), store.ContextTLSData{
 		Endpoints: map[string]store.EndpointTLSData{
 			"ep2": {
 				Files: map[string][]byte{
@@ -88,7 +82,6 @@ func TestExportDefaultImport(t *testing.T) {
 			},
 		},
 	})
-	defer cleanup()
 	r := store.Export("default", s)
 	defer r.Close()
 	err := store.Import("dest", s, r)
@@ -127,8 +120,7 @@ func TestExportDefaultImport(t *testing.T) {
 
 func TestListDefaultContext(t *testing.T) {
 	meta := testDefaultMetadata()
-	s, cleanup := testStore(t, meta, store.ContextTLSData{})
+	s := testStore(t, meta, store.ContextTLSData{})
-	defer cleanup()
 	result, err := s.List()
 	assert.NilError(t, err)
 	assert.Equal(t, 1, len(result))
@@ -136,8 +128,7 @@ func TestListDefaultContext(t *testing.T) {
 }
 
 func TestGetDefaultContextStorageInfo(t *testing.T) {
-	s, cleanup := testStore(t, testDefaultMetadata(), store.ContextTLSData{})
+	s := testStore(t, testDefaultMetadata(), store.ContextTLSData{})
-	defer cleanup()
 	result := s.GetStorageInfo(DefaultContextName)
 	assert.Equal(t, "<IN MEMORY>", result.MetadataPath)
 	assert.Equal(t, "<IN MEMORY>", result.TLSPath)
@@ -145,8 +136,7 @@ func TestGetDefaultContextStorageInfo(t *testing.T) {
 
 func TestGetDefaultContextMetadata(t *testing.T) {
 	meta := testDefaultMetadata()
-	s, cleanup := testStore(t, meta, store.ContextTLSData{})
+	s := testStore(t, meta, store.ContextTLSData{})
-	defer cleanup()
 	result, err := s.GetMetadata(DefaultContextName)
 	assert.NilError(t, err)
 	assert.Equal(t, DefaultContextName, result.Name)
@@ -156,8 +146,7 @@ func TestGetDefaultContextMetadata(t *testing.T) {
 
 func TestErrCreateDefault(t *testing.T) {
 	meta := testDefaultMetadata()
-	s, cleanup := testStore(t, meta, store.ContextTLSData{})
+	s := testStore(t, meta, store.ContextTLSData{})
-	defer cleanup()
 	err := s.CreateOrUpdate(store.Metadata{
 		Endpoints: map[string]interface{}{
 			"ep1": endpoint{Foo: "bar"},
@@ -170,16 +159,14 @@ func TestErrCreateDefault(t *testing.T) {
 
 func TestErrRemoveDefault(t *testing.T) {
 	meta := testDefaultMetadata()
-	s, cleanup := testStore(t, meta, store.ContextTLSData{})
+	s := testStore(t, meta, store.ContextTLSData{})
-	defer cleanup()
 	err := s.Remove("default")
 	assert.Error(t, err, "default context cannot be removed")
 }
 
 func TestErrTLSDataError(t *testing.T) {
 	meta := testDefaultMetadata()
-	s, cleanup := testStore(t, meta, store.ContextTLSData{})
+	s := testStore(t, meta, store.ContextTLSData{})
-	defer cleanup()
 	_, err := s.GetTLSData("default", "noop", "noop")
 	assert.Check(t, store.IsErrTLSDataDoesNotExist(err))
 }

cli/command/image/build.go

@@ -8,7 +8,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -298,7 +297,7 @@ func runBuild(dockerCli command.Cli, options buildOptions) error {
 			if err != nil {
 				return err
 			}
-			dockerfileCtx = ioutil.NopCloser(bytes.NewBuffer(newDockerfile))
+			dockerfileCtx = io.NopCloser(bytes.NewBuffer(newDockerfile))
 		}
 	}
 
@@ -394,7 +393,7 @@ func runBuild(dockerCli command.Cli, options buildOptions) error {
 		if imageID == "" {
 			return errors.Errorf("Server did not provide an image ID. Cannot write %s", options.imageIDFile)
 		}
-		if err := ioutil.WriteFile(options.imageIDFile, []byte(imageID), 0666); err != nil {
+		if err := os.WriteFile(options.imageIDFile, []byte(imageID), 0666); err != nil {
 			return err
 		}
 	}

cli/command/image/build/context.go

@@ -6,7 +6,6 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -117,13 +116,13 @@ func DetectArchiveReader(input io.ReadCloser) (rc io.ReadCloser, isArchive bool,
 // temporary directory containing the Dockerfile.
 func WriteTempDockerfile(rc io.ReadCloser) (dockerfileDir string, err error) {
 	// err is a named return value, due to the defer call below.
-	dockerfileDir, err = ioutil.TempDir("", "docker-build-tempdockerfile-")
+	dockerfileDir, err = os.MkdirTemp("", "docker-build-tempdockerfile-")
 	if err != nil {
 		return "", errors.Errorf("unable to create temporary context directory: %v", err)
 	}
 	defer func() {
 		if err != nil {
-			os.RemoveAll(dockerfileDir)
+			_ = os.RemoveAll(dockerfileDir)
 		}
 	}()
 
@@ -240,7 +239,7 @@ func getWithStatusError(url string) (resp *http.Response, err error) {
 		return resp, nil
 	}
 	msg := fmt.Sprintf("failed to GET %s with status %s", url, resp.Status)
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	resp.Body.Close()
 	if err != nil {
 		return nil, errors.Wrapf(err, "%s: error reading body", msg)
@@ -372,7 +371,7 @@ func isUNC(path string) bool {
 // AddDockerfileToBuildContext from a ReadCloser, returns a new archive and
 // the relative path to the dockerfile in the context.
 func AddDockerfileToBuildContext(dockerfileCtx io.ReadCloser, buildCtx io.ReadCloser) (io.ReadCloser, string, error) {
-	file, err := ioutil.ReadAll(dockerfileCtx)
+	file, err := io.ReadAll(dockerfileCtx)
 	dockerfileCtx.Close()
 	if err != nil {
 		return nil, "", err

cli/command/image/build/context_test.go

@@ -4,7 +4,6 @@ import (
 	"archive/tar"
 	"bytes"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -19,40 +18,34 @@ import (
 
 const dockerfileContents = "FROM busybox"
 
-var prepareEmpty = func(t *testing.T) (string, func()) {
+func prepareEmpty(t *testing.T) string {
-	return "", func() {}
+	return ""
 }
 
-var prepareNoFiles = func(t *testing.T) (string, func()) {
+func prepareNoFiles(t *testing.T) string {
-	return createTestTempDir(t, "builder-context-test")
+	return createTestTempDir(t)
 }
 
-var prepareOneFile = func(t *testing.T) (string, func()) {
+func prepareOneFile(t *testing.T) string {
-	contextDir, cleanup := createTestTempDir(t, "builder-context-test")
+	contextDir := createTestTempDir(t)
 	createTestTempFile(t, contextDir, DefaultDockerfileName, dockerfileContents)
-	return contextDir, cleanup
+	return contextDir
 }
 
-func testValidateContextDirectory(t *testing.T, prepare func(t *testing.T) (string, func()), excludes []string) {
+func testValidateContextDirectory(t *testing.T, prepare func(t *testing.T) string, excludes []string) {
-	contextDir, cleanup := prepare(t)
+	contextDir := prepare(t)
-	defer cleanup()
-
 	err := ValidateContextDirectory(contextDir, excludes)
 	assert.NilError(t, err)
 }
 
 func TestGetContextFromLocalDirNoDockerfile(t *testing.T) {
-	contextDir, cleanup := createTestTempDir(t, "builder-context-test")
+	contextDir := createTestTempDir(t)
-	defer cleanup()
-
 	_, _, err := GetContextFromLocalDir(contextDir, "")
 	assert.ErrorContains(t, err, "Dockerfile")
 }
 
 func TestGetContextFromLocalDirNotExistingDir(t *testing.T) {
-	contextDir, cleanup := createTestTempDir(t, "builder-context-test")
+	contextDir := createTestTempDir(t)
-	defer cleanup()
-
 	fakePath := filepath.Join(contextDir, "fake")
 
 	_, _, err := GetContextFromLocalDir(fakePath, "")
@@ -60,9 +53,7 @@ func TestGetContextFromLocalDirNotExistingDir(t *testing.T) {
 }
 
 func TestGetContextFromLocalDirNotExistingDockerfile(t *testing.T) {
-	contextDir, cleanup := createTestTempDir(t, "builder-context-test")
+	contextDir := createTestTempDir(t)
-	defer cleanup()
-
 	fakePath := filepath.Join(contextDir, "fake")
 
 	_, _, err := GetContextFromLocalDir(contextDir, fakePath)
@@ -70,13 +61,10 @@ func TestGetContextFromLocalDirNotExistingDockerfile(t *testing.T) {
 }
 
 func TestGetContextFromLocalDirWithNoDirectory(t *testing.T) {
-	contextDir, dirCleanup := createTestTempDir(t, "builder-context-test")
+	contextDir := createTestTempDir(t)
-	defer dirCleanup()
-
 	createTestTempFile(t, contextDir, DefaultDockerfileName, dockerfileContents)
 
-	chdirCleanup := chdir(t, contextDir)
+	chdir(t, contextDir)
-	defer chdirCleanup()
 
 	absContextDir, relDockerfile, err := GetContextFromLocalDir(contextDir, "")
 	assert.NilError(t, err)
@@ -86,9 +74,7 @@ func TestGetContextFromLocalDirWithNoDirectory(t *testing.T) {
 }
 
 func TestGetContextFromLocalDirWithDockerfile(t *testing.T) {
-	contextDir, cleanup := createTestTempDir(t, "builder-context-test")
+	contextDir := createTestTempDir(t)
-	defer cleanup()
-
 	createTestTempFile(t, contextDir, DefaultDockerfileName, dockerfileContents)
 
 	absContextDir, relDockerfile, err := GetContextFromLocalDir(contextDir, "")
@@ -99,9 +85,7 @@ func TestGetContextFromLocalDirWithDockerfile(t *testing.T) {
 }
 
 func TestGetContextFromLocalDirLocalFile(t *testing.T) {
-	contextDir, cleanup := createTestTempDir(t, "builder-context-test")
+	contextDir := createTestTempDir(t)
-	defer cleanup()
-
 	createTestTempFile(t, contextDir, DefaultDockerfileName, dockerfileContents)
 	testFilename := createTestTempFile(t, contextDir, "tmpTest", "test")
 
@@ -121,11 +105,8 @@ func TestGetContextFromLocalDirLocalFile(t *testing.T) {
 }
 
 func TestGetContextFromLocalDirWithCustomDockerfile(t *testing.T) {
-	contextDir, cleanup := createTestTempDir(t, "builder-context-test")
+	contextDir := createTestTempDir(t)
-	defer cleanup()
+	chdir(t, contextDir)
-
-	chdirCleanup := chdir(t, contextDir)
-	defer chdirCleanup()
 
 	createTestTempFile(t, contextDir, DefaultDockerfileName, dockerfileContents)
 
@@ -137,7 +118,7 @@ func TestGetContextFromLocalDirWithCustomDockerfile(t *testing.T) {
 }
 
 func TestGetContextFromReaderString(t *testing.T) {
-	tarArchive, relDockerfile, err := GetContextFromReader(ioutil.NopCloser(strings.NewReader(dockerfileContents)), "")
+	tarArchive, relDockerfile, err := GetContextFromReader(io.NopCloser(strings.NewReader(dockerfileContents)), "")
 
 	if err != nil {
 		t.Fatalf("Error when executing GetContextFromReader: %s", err)
@@ -173,9 +154,7 @@ func TestGetContextFromReaderString(t *testing.T) {
 }
 
 func TestGetContextFromReaderTar(t *testing.T) {
-	contextDir, cleanup := createTestTempDir(t, "builder-context-test")
+	contextDir := createTestTempDir(t)
-	defer cleanup()
-
 	createTestTempFile(t, contextDir, DefaultDockerfileName, dockerfileContents)
 
 	tarStream, err := archive.Tar(contextDir, archive.Uncompressed)
@@ -238,23 +217,24 @@ func TestValidateContextDirectoryWithOneFileExcludes(t *testing.T) {
 	testValidateContextDirectory(t, prepareOneFile, []string{DefaultDockerfileName})
 }
 
-// createTestTempDir creates a temporary directory for testing.
+// createTestTempDir creates a temporary directory for testing. It returns the
-// It returns the created path and a cleanup function which is meant to be used as deferred call.
+// created path. When an error occurs, it terminates the test.
-// When an error occurs, it terminates the test.
+func createTestTempDir(t *testing.T) string {
-//nolint: unparam
+	t.Helper()
-func createTestTempDir(t *testing.T, prefix string) (string, func()) {
+	path := t.TempDir()
-	path, err := ioutil.TempDir("", prefix)
+
+	// Eval Symlinks is needed to account for macOS TMP using symlinks
+	path, err := filepath.EvalSymlinks(path)
 	assert.NilError(t, err)
-	path, err = filepath.EvalSymlinks(path)
+	return path
-	assert.NilError(t, err)
-	return path, func() { assert.NilError(t, os.RemoveAll(path)) }
 }
 
 // createTestTempFile creates a temporary file within dir with specific contents and permissions.
 // When an error occurs, it terminates the test
 func createTestTempFile(t *testing.T, dir, filename, contents string) string {
+	t.Helper()
 	filePath := filepath.Join(dir, filename)
-	err := ioutil.WriteFile(filePath, []byte(contents), 0777)
+	err := os.WriteFile(filePath, []byte(contents), 0777)
 	assert.NilError(t, err)
 	return filePath
 }
@@ -263,11 +243,13 @@ func createTestTempFile(t *testing.T, dir, filename, contents string) string {
 // It returns a function which changes working directory back to the previous one.
 // This function is meant to be executed as a deferred call.
 // When an error occurs, it terminates the test.
-func chdir(t *testing.T, dir string) func() {
+func chdir(t *testing.T, dir string) {
 	workingDirectory, err := os.Getwd()
 	assert.NilError(t, err)
 	assert.NilError(t, os.Chdir(dir))
-	return func() { assert.NilError(t, os.Chdir(workingDirectory)) }
+	t.Cleanup(func() {
+		assert.NilError(t, os.Chdir(workingDirectory))
+	})
 }
 
 func TestIsArchive(t *testing.T) {

cli/command/image/build_test.go

@@ -6,7 +6,6 @@ import (
 	"compress/gzip"
 	"context"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"sort"
@@ -39,7 +38,7 @@ func TestRunBuildDockerfileFromStdinWithCompress(t *testing.T) {
 		FROM alpine:3.6
 		COPY foo /
 	`)
-	cli.SetIn(streams.NewIn(ioutil.NopCloser(dockerfile)))
+	cli.SetIn(streams.NewIn(io.NopCloser(dockerfile)))
 
 	dir := fs.NewDir(t, t.Name(),
 		fs.WithFile("foo", "some content"))
@@ -128,7 +127,7 @@ func TestRunBuildFromGitHubSpecialCase(t *testing.T) {
 	cmd := NewBuildCommand(test.NewFakeCli(&fakeClient{}))
 	// Clone a small repo that exists so git doesn't prompt for credentials
 	cmd.SetArgs([]string{"github.com/docker/for-win"})
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	err := cmd.Execute()
 	assert.ErrorContains(t, err, "unable to prepare context")
 	assert.ErrorContains(t, err, "docker-build-git")
@@ -139,20 +138,17 @@ func TestRunBuildFromGitHubSpecialCase(t *testing.T) {
 // case.
 func TestRunBuildFromLocalGitHubDir(t *testing.T) {
 	defer env.Patch(t, "DOCKER_BUILDKIT", "0")()
-	tmpDir, err := ioutil.TempDir("", "docker-build-from-local-dir-")
-	assert.NilError(t, err)
-	defer os.RemoveAll(tmpDir)
 
-	buildDir := filepath.Join(tmpDir, "github.com", "docker", "no-such-repository")
+	buildDir := filepath.Join(t.TempDir(), "github.com", "docker", "no-such-repository")
-	err = os.MkdirAll(buildDir, 0777)
+	err := os.MkdirAll(buildDir, 0777)
 	assert.NilError(t, err)
-	err = ioutil.WriteFile(filepath.Join(buildDir, "Dockerfile"), []byte("FROM busybox\n"), 0644)
+	err = os.WriteFile(filepath.Join(buildDir, "Dockerfile"), []byte("FROM busybox\n"), 0644)
 	assert.NilError(t, err)
 
 	client := test.NewFakeCli(&fakeClient{})
 	cmd := NewBuildCommand(client)
 	cmd.SetArgs([]string{buildDir})
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	err = cmd.Execute()
 	assert.NilError(t, err)
 }
@@ -193,7 +189,7 @@ func (f *fakeBuild) build(_ context.Context, context io.Reader, options types.Im
 	f.context = tar.NewReader(context)
 	f.options = options
 	body := new(bytes.Buffer)
-	return types.ImageBuildResponse{Body: ioutil.NopCloser(body)}, nil
+	return types.ImageBuildResponse{Body: io.NopCloser(body)}, nil
 }
 
 func (f *fakeBuild) headers(t *testing.T) []*tar.Header {

cli/command/image/client_test.go

@@ -3,7 +3,6 @@ package image
 import (
 	"context"
 	"io"
-	"io/ioutil"
 	"strings"
 	"time"
 
@@ -41,7 +40,7 @@ func (cli *fakeClient) ImageSave(_ context.Context, images []string) (io.ReadClo
 	if cli.imageSaveFunc != nil {
 		return cli.imageSaveFunc(images)
 	}
-	return ioutil.NopCloser(strings.NewReader("")), nil
+	return io.NopCloser(strings.NewReader("")), nil
 }
 
 func (cli *fakeClient) ImageRemove(_ context.Context, image string,
@@ -56,7 +55,7 @@ func (cli *fakeClient) ImagePush(_ context.Context, ref string, options types.Im
 	if cli.imagePushFunc != nil {
 		return cli.imagePushFunc(ref, options)
 	}
-	return ioutil.NopCloser(strings.NewReader("")), nil
+	return io.NopCloser(strings.NewReader("")), nil
 }
 
 func (cli *fakeClient) Info(_ context.Context) (types.Info, error) {
@@ -70,7 +69,7 @@ func (cli *fakeClient) ImagePull(_ context.Context, ref string, options types.Im
 	if cli.imagePullFunc != nil {
 		cli.imagePullFunc(ref, options)
 	}
-	return ioutil.NopCloser(strings.NewReader("")), nil
+	return io.NopCloser(strings.NewReader("")), nil
 }
 
 func (cli *fakeClient) ImagesPrune(_ context.Context, pruneFilter filters.Args) (types.ImagesPruneReport, error) {
@@ -106,7 +105,7 @@ func (cli *fakeClient) ImageImport(_ context.Context, source types.ImageImportSo
 	if cli.imageImportFunc != nil {
 		return cli.imageImportFunc(source, ref, options)
 	}
-	return ioutil.NopCloser(strings.NewReader("")), nil
+	return io.NopCloser(strings.NewReader("")), nil
 }
 
 func (cli *fakeClient) ImageHistory(_ context.Context, img string) ([]image.HistoryResponseItem, error) {
@@ -120,5 +119,5 @@ func (cli *fakeClient) ImageBuild(ctx context.Context, context io.Reader, option
 	if cli.imageBuildFunc != nil {
 		return cli.imageBuildFunc(ctx, context, options)
 	}
-	return types.ImageBuildResponse{Body: ioutil.NopCloser(strings.NewReader(""))}, nil
+	return types.ImageBuildResponse{Body: io.NopCloser(strings.NewReader(""))}, nil
 }

cli/command/image/history_test.go

@@ -2,7 +2,7 @@ package image
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 	"time"
 
@@ -37,7 +37,7 @@ func TestNewHistoryCommandErrors(t *testing.T) {
 	}
 	for _, tc := range testCases {
 		cmd := NewHistoryCommand(test.NewFakeCli(&fakeClient{imageHistoryFunc: tc.imageHistoryFunc}))
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
@@ -95,7 +95,7 @@ func TestNewHistoryCommandSuccess(t *testing.T) {
 	for _, tc := range testCases {
 		cli := test.NewFakeCli(&fakeClient{imageHistoryFunc: tc.imageHistoryFunc})
 		cmd := NewHistoryCommand(cli)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		err := cmd.Execute()
 		assert.NilError(t, err)

cli/command/image/import_test.go

@@ -2,7 +2,6 @@ package image
 
 import (
 	"io"
-	"io/ioutil"
 	"strings"
 	"testing"
 
@@ -36,7 +35,7 @@ func TestNewImportCommandErrors(t *testing.T) {
 	}
 	for _, tc := range testCases {
 		cmd := NewImportCommand(test.NewFakeCli(&fakeClient{imageImportFunc: tc.imageImportFunc}))
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
@@ -44,7 +43,7 @@ func TestNewImportCommandErrors(t *testing.T) {
 
 func TestNewImportCommandInvalidFile(t *testing.T) {
 	cmd := NewImportCommand(test.NewFakeCli(&fakeClient{}))
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	cmd.SetArgs([]string{"testdata/import-command-success.unexistent-file"})
 	assert.ErrorContains(t, cmd.Execute(), "testdata/import-command-success.unexistent-file")
 }
@@ -68,7 +67,7 @@ func TestNewImportCommandSuccess(t *testing.T) {
 			args: []string{"-", "image:local"},
 			imageImportFunc: func(source types.ImageImportSource, ref string, options types.ImageImportOptions) (io.ReadCloser, error) {
 				assert.Check(t, is.Equal("image:local", ref))
-				return ioutil.NopCloser(strings.NewReader("")), nil
+				return io.NopCloser(strings.NewReader("")), nil
 			},
 		},
 		{
@@ -76,7 +75,7 @@ func TestNewImportCommandSuccess(t *testing.T) {
 			args: []string{"--message", "test message", "-"},
 			imageImportFunc: func(source types.ImageImportSource, ref string, options types.ImageImportOptions) (io.ReadCloser, error) {
 				assert.Check(t, is.Equal("test message", options.Message))
-				return ioutil.NopCloser(strings.NewReader("")), nil
+				return io.NopCloser(strings.NewReader("")), nil
 			},
 		},
 		{
@@ -84,7 +83,7 @@ func TestNewImportCommandSuccess(t *testing.T) {
 			args: []string{"--change", "ENV DEBUG=true", "-"},
 			imageImportFunc: func(source types.ImageImportSource, ref string, options types.ImageImportOptions) (io.ReadCloser, error) {
 				assert.Check(t, is.Equal("ENV DEBUG=true", options.Changes[0]))
-				return ioutil.NopCloser(strings.NewReader("")), nil
+				return io.NopCloser(strings.NewReader("")), nil
 			},
 		},
 		{
@@ -92,13 +91,13 @@ func TestNewImportCommandSuccess(t *testing.T) {
 			args: []string{"--change", "ENV DEBUG true", "-"},
 			imageImportFunc: func(source types.ImageImportSource, ref string, options types.ImageImportOptions) (io.ReadCloser, error) {
 				assert.Check(t, is.Equal("ENV DEBUG true", options.Changes[0]))
-				return ioutil.NopCloser(strings.NewReader("")), nil
+				return io.NopCloser(strings.NewReader("")), nil
 			},
 		},
 	}
 	for _, tc := range testCases {
 		cmd := NewImportCommand(test.NewFakeCli(&fakeClient{imageImportFunc: tc.imageImportFunc}))
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		assert.NilError(t, cmd.Execute())
 	}

cli/command/image/inspect_test.go

@@ -2,7 +2,7 @@ package image
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -26,7 +26,7 @@ func TestNewInspectCommandErrors(t *testing.T) {
 	}
 	for _, tc := range testCases {
 		cmd := newInspectCommand(test.NewFakeCli(&fakeClient{}))
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
@@ -78,7 +78,7 @@ func TestNewInspectCommandSuccess(t *testing.T) {
 		imageInspectInvocationCount = 0
 		cli := test.NewFakeCli(&fakeClient{imageInspectFunc: tc.imageInspectFunc})
 		cmd := newInspectCommand(cli)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		err := cmd.Execute()
 		assert.NilError(t, err)

cli/command/image/list_test.go

@@ -2,7 +2,7 @@ package image
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/cli/config/configfile"
@@ -36,7 +36,7 @@ func TestNewImagesCommandErrors(t *testing.T) {
 	}
 	for _, tc := range testCases {
 		cmd := NewImagesCommand(test.NewFakeCli(&fakeClient{imageListFunc: tc.imageListFunc}))
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
@@ -82,7 +82,7 @@ func TestNewImagesCommandSuccess(t *testing.T) {
 		cli := test.NewFakeCli(&fakeClient{imageListFunc: tc.imageListFunc})
 		cli.SetConfigFile(&configfile.ConfigFile{ImagesFormat: tc.imageFormat})
 		cmd := NewImagesCommand(cli)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		err := cmd.Execute()
 		assert.NilError(t, err)

cli/command/image/load_test.go

@@ -3,7 +3,6 @@ package image
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"strings"
 	"testing"
 
@@ -44,7 +43,7 @@ func TestNewLoadCommandErrors(t *testing.T) {
 		cli := test.NewFakeCli(&fakeClient{imageLoadFunc: tc.imageLoadFunc})
 		cli.In().SetIsTerminal(tc.isTerminalIn)
 		cmd := NewLoadCommand(cli)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
@@ -53,7 +52,7 @@ func TestNewLoadCommandErrors(t *testing.T) {
 func TestNewLoadCommandInvalidInput(t *testing.T) {
 	expectedError := "open *"
 	cmd := NewLoadCommand(test.NewFakeCli(&fakeClient{}))
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	cmd.SetArgs([]string{"--input", "*"})
 	err := cmd.Execute()
 	assert.ErrorContains(t, err, expectedError)
@@ -68,7 +67,7 @@ func TestNewLoadCommandSuccess(t *testing.T) {
 		{
 			name: "simple",
 			imageLoadFunc: func(input io.Reader, quiet bool) (types.ImageLoadResponse, error) {
-				return types.ImageLoadResponse{Body: ioutil.NopCloser(strings.NewReader("Success"))}, nil
+				return types.ImageLoadResponse{Body: io.NopCloser(strings.NewReader("Success"))}, nil
 			},
 		},
 		{
@@ -76,7 +75,7 @@ func TestNewLoadCommandSuccess(t *testing.T) {
 			imageLoadFunc: func(input io.Reader, quiet bool) (types.ImageLoadResponse, error) {
 				json := "{\"ID\": \"1\"}"
 				return types.ImageLoadResponse{
-					Body: ioutil.NopCloser(strings.NewReader(json)),
+					Body: io.NopCloser(strings.NewReader(json)),
 					JSON: true,
 				}, nil
 			},
@@ -85,14 +84,14 @@ func TestNewLoadCommandSuccess(t *testing.T) {
 			name: "input-file",
 			args: []string{"--input", "testdata/load-command-success.input.txt"},
 			imageLoadFunc: func(input io.Reader, quiet bool) (types.ImageLoadResponse, error) {
-				return types.ImageLoadResponse{Body: ioutil.NopCloser(strings.NewReader("Success"))}, nil
+				return types.ImageLoadResponse{Body: io.NopCloser(strings.NewReader("Success"))}, nil
 			},
 		},
 	}
 	for _, tc := range testCases {
 		cli := test.NewFakeCli(&fakeClient{imageLoadFunc: tc.imageLoadFunc})
 		cmd := NewLoadCommand(cli)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		err := cmd.Execute()
 		assert.NilError(t, err)

cli/command/image/prune_test.go

@@ -2,7 +2,7 @@ package image
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -39,7 +39,7 @@ func TestNewPruneCommandErrors(t *testing.T) {
 		cmd := NewPruneCommand(test.NewFakeCli(&fakeClient{
 			imagesPruneFunc: tc.imagesPruneFunc,
 		}))
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
@@ -93,7 +93,7 @@ func TestNewPruneCommandSuccess(t *testing.T) {
 	for _, tc := range testCases {
 		cli := test.NewFakeCli(&fakeClient{imagesPruneFunc: tc.imagesPruneFunc})
 		cmd := NewPruneCommand(cli)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		err := cmd.Execute()
 		assert.NilError(t, err)

cli/command/image/pull_test.go

@@ -3,7 +3,6 @@ package image
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"strings"
 	"testing"
 
@@ -40,7 +39,7 @@ func TestNewPullCommandErrors(t *testing.T) {
 	for _, tc := range testCases {
 		cli := test.NewFakeCli(&fakeClient{})
 		cmd := NewPullCommand(cli)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
@@ -72,11 +71,11 @@ func TestNewPullCommandSuccess(t *testing.T) {
 		cli := test.NewFakeCli(&fakeClient{
 			imagePullFunc: func(ref string, options types.ImagePullOptions) (io.ReadCloser, error) {
 				assert.Check(t, is.Equal(tc.expectedTag, ref), tc.name)
-				return ioutil.NopCloser(strings.NewReader("")), nil
+				return io.NopCloser(strings.NewReader("")), nil
 			},
 		})
 		cmd := NewPullCommand(cli)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		err := cmd.Execute()
 		assert.NilError(t, err)
@@ -113,12 +112,12 @@ func TestNewPullCommandWithContentTrustErrors(t *testing.T) {
 	for _, tc := range testCases {
 		cli := test.NewFakeCli(&fakeClient{
 			imagePullFunc: func(ref string, options types.ImagePullOptions) (io.ReadCloser, error) {
-				return ioutil.NopCloser(strings.NewReader("")), fmt.Errorf("shouldn't try to pull image")
+				return io.NopCloser(strings.NewReader("")), fmt.Errorf("shouldn't try to pull image")
 			},
 		}, test.EnableContentTrust)
 		cli.SetNotaryClient(tc.notaryFunc)
 		cmd := NewPullCommand(cli)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		err := cmd.Execute()
 		assert.ErrorContains(t, err, tc.expectedError)

cli/command/image/push.go

@@ -3,7 +3,7 @@ package image
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
@@ -93,7 +93,7 @@ func RunPush(dockerCli command.Cli, opts pushOptions) error {
 	}
 
 	if opts.quiet {
-		err = jsonmessage.DisplayJSONMessagesToStream(responseBody, streams.NewOut(ioutil.Discard), nil)
+		err = jsonmessage.DisplayJSONMessagesToStream(responseBody, streams.NewOut(io.Discard), nil)
 		if err == nil {
 			fmt.Fprintln(dockerCli.Out(), ref.String())
 		}

cli/command/image/push_test.go

@@ -2,7 +2,6 @@ package image
 
 import (
 	"io"
-	"io/ioutil"
 	"strings"
 	"testing"
 
@@ -34,14 +33,14 @@ func TestNewPushCommandErrors(t *testing.T) {
 			args:          []string{"image:repo"},
 			expectedError: "Failed to push",
 			imagePushFunc: func(ref string, options types.ImagePushOptions) (io.ReadCloser, error) {
-				return ioutil.NopCloser(strings.NewReader("")), errors.Errorf("Failed to push")
+				return io.NopCloser(strings.NewReader("")), errors.Errorf("Failed to push")
 			},
 		},
 	}
 	for _, tc := range testCases {
 		cli := test.NewFakeCli(&fakeClient{imagePushFunc: tc.imagePushFunc})
 		cmd := NewPushCommand(cli)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
@@ -69,7 +68,7 @@ func TestNewPushCommandSuccess(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			cli := test.NewFakeCli(&fakeClient{
 				imagePushFunc: func(ref string, options types.ImagePushOptions) (io.ReadCloser, error) {
-					return ioutil.NopCloser(strings.NewReader("")), nil
+					return io.NopCloser(strings.NewReader("")), nil
 				},
 			})
 			cmd := NewPushCommand(cli)

cli/command/image/remove_test.go

@@ -2,7 +2,7 @@ package image
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -68,7 +68,7 @@ func TestNewRemoveCommandErrors(t *testing.T) {
 			cmd := NewRemoveCommand(test.NewFakeCli(&fakeClient{
 				imageRemoveFunc: tc.imageRemoveFunc,
 			}))
-			cmd.SetOut(ioutil.Discard)
+			cmd.SetOut(io.Discard)
 			cmd.SetArgs(tc.args)
 			assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 		})
@@ -124,7 +124,7 @@ func TestNewRemoveCommandSuccess(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			cli := test.NewFakeCli(&fakeClient{imageRemoveFunc: tc.imageRemoveFunc})
 			cmd := NewRemoveCommand(cli)
-			cmd.SetOut(ioutil.Discard)
+			cmd.SetOut(io.Discard)
 			cmd.SetArgs(tc.args)
 			assert.NilError(t, cmd.Execute())
 			assert.Check(t, is.Equal(tc.expectedStderr, cli.ErrBuffer().String()))

cli/command/image/save_test.go

@@ -2,7 +2,6 @@ package image
 
 import (
 	"io"
-	"io/ioutil"
 	"os"
 	"strings"
 	"testing"
@@ -38,7 +37,7 @@ func TestNewSaveCommandErrors(t *testing.T) {
 			isTerminal:    false,
 			expectedError: "error saving image",
 			imageSaveFunc: func(images []string) (io.ReadCloser, error) {
-				return ioutil.NopCloser(strings.NewReader("")), errors.Errorf("error saving image")
+				return io.NopCloser(strings.NewReader("")), errors.Errorf("error saving image")
 			},
 		},
 		{
@@ -56,7 +55,7 @@ func TestNewSaveCommandErrors(t *testing.T) {
 		cli := test.NewFakeCli(&fakeClient{imageSaveFunc: tc.imageSaveFunc})
 		cli.Out().SetIsTerminal(tc.isTerminal)
 		cmd := NewSaveCommand(cli)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
@@ -75,7 +74,7 @@ func TestNewSaveCommandSuccess(t *testing.T) {
 			imageSaveFunc: func(images []string) (io.ReadCloser, error) {
 				assert.Assert(t, is.Len(images, 1))
 				assert.Check(t, is.Equal("arg1", images[0]))
-				return ioutil.NopCloser(strings.NewReader("")), nil
+				return io.NopCloser(strings.NewReader("")), nil
 			},
 			deferredFunc: func() {
 				os.Remove("save_tmp_file")
@@ -88,17 +87,17 @@ func TestNewSaveCommandSuccess(t *testing.T) {
 				assert.Assert(t, is.Len(images, 2))
 				assert.Check(t, is.Equal("arg1", images[0]))
 				assert.Check(t, is.Equal("arg2", images[1]))
-				return ioutil.NopCloser(strings.NewReader("")), nil
+				return io.NopCloser(strings.NewReader("")), nil
 			},
 		},
 	}
 	for _, tc := range testCases {
 		cmd := NewSaveCommand(test.NewFakeCli(&fakeClient{
 			imageSaveFunc: func(images []string) (io.ReadCloser, error) {
-				return ioutil.NopCloser(strings.NewReader("")), nil
+				return io.NopCloser(strings.NewReader("")), nil
 			},
 		}))
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		cmd.SetArgs(tc.args)
 		assert.NilError(t, cmd.Execute())
 		if tc.deferredFunc != nil {

cli/command/image/tag_test.go

@@ -1,7 +1,7 @@
 package image
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -19,7 +19,7 @@ func TestCliNewTagCommandErrors(t *testing.T) {
 	for _, args := range testCases {
 		cmd := NewTagCommand(test.NewFakeCli(&fakeClient{}))
 		cmd.SetArgs(args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), expectedError)
 	}
 }
@@ -34,7 +34,7 @@ func TestCliNewTagCommand(t *testing.T) {
 			},
 		}))
 	cmd.SetArgs([]string{"image1", "image2"})
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	assert.NilError(t, cmd.Execute())
 	value, _ := cmd.Flags().GetBool("interspersed")
 	assert.Check(t, !value)

cli/command/image/trust.go

@@ -6,7 +6,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"sort"
 
 	"github.com/docker/cli/cli/command"
@@ -283,7 +282,7 @@ func imagePullPrivileged(ctx context.Context, cli command.Cli, imgRefAndAuth tru
 
 	out := cli.Out()
 	if opts.quiet {
-		out = streams.NewOut(ioutil.Discard)
+		out = streams.NewOut(io.Discard)
 	}
 	return jsonmessage.DisplayJSONMessagesToStream(responseBody, out, nil)
 }

cli/command/image/trust_test.go

@@ -1,8 +1,6 @@
 package image
 
 import (
-	"io/ioutil"
-	"os"
 	"testing"
 
 	"github.com/docker/cli/cli/trust"
@@ -51,11 +49,7 @@ func TestNonOfficialTrustServer(t *testing.T) {
 }
 
 func TestAddTargetToAllSignableRolesError(t *testing.T) {
-	tmpDir, err := ioutil.TempDir("", "notary-test-")
+	notaryRepo, err := client.NewFileCachedRepository(t.TempDir(), "gun", "https://localhost", nil, passphrase.ConstantRetriever("password"), trustpinning.TrustPinConfig{})
-	assert.NilError(t, err)
-	defer os.RemoveAll(tmpDir)
-
-	notaryRepo, err := client.NewFileCachedRepository(tmpDir, "gun", "https://localhost", nil, passphrase.ConstantRetriever("password"), trustpinning.TrustPinConfig{})
 	assert.NilError(t, err)
 	target := client.Target{}
 	err = AddTargetToAllSignableRoles(notaryRepo, &target)

cli/command/manifest/annotate_test.go

@@ -1,9 +1,10 @@
 package manifest
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 
+	"github.com/docker/cli/cli/manifest/store"
 	"github.com/docker/cli/internal/test"
 	"gotest.tools/v3/assert"
 	is "gotest.tools/v3/assert/cmp"
@@ -33,14 +34,13 @@ func TestManifestAnnotateError(t *testing.T) {
 		cli := test.NewFakeCli(nil)
 		cmd := newAnnotateCommand(cli)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }
 
 func TestManifestAnnotate(t *testing.T) {
-	store, cleanup := newTempManifestStore(t)
+	store := store.NewStore(t.TempDir())
-	defer cleanup()
 
 	cli := test.NewFakeCli(nil)
 	cli.SetManifestStore(store)
@@ -51,7 +51,7 @@ func TestManifestAnnotate(t *testing.T) {
 
 	cmd := newAnnotateCommand(cli)
 	cmd.SetArgs([]string{"example.com/list:v1", "example.com/fake:0.0"})
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	expectedError := "manifest for image example.com/fake:0.0 does not exist"
 	assert.ErrorContains(t, cmd.Execute(), expectedError)
 

cli/command/manifest/create_test.go

@@ -2,9 +2,10 @@ package manifest
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 	"testing"
 
+	"github.com/docker/cli/cli/manifest/store"
 	manifesttypes "github.com/docker/cli/cli/manifest/types"
 	"github.com/docker/cli/internal/test"
 	"github.com/docker/distribution/reference"
@@ -33,15 +34,14 @@ func TestManifestCreateErrors(t *testing.T) {
 		cli := test.NewFakeCli(nil)
 		cmd := newCreateListCommand(cli)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }
 
 // create a manifest list, then overwrite it, and inspect to see if the old one is still there
 func TestManifestCreateAmend(t *testing.T) {
-	store, cleanup := newTempManifestStore(t)
+	store := store.NewStore(t.TempDir())
-	defer cleanup()
 
 	cli := test.NewFakeCli(nil)
 	cli.SetManifestStore(store)
@@ -58,7 +58,7 @@ func TestManifestCreateAmend(t *testing.T) {
 	cmd := newCreateListCommand(cli)
 	cmd.SetArgs([]string{"example.com/list:v1", "example.com/alpine:3.1"})
 	cmd.Flags().Set("amend", "true")
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	err = cmd.Execute()
 	assert.NilError(t, err)
 
@@ -75,8 +75,7 @@ func TestManifestCreateAmend(t *testing.T) {
 
 // attempt to overwrite a saved manifest and get refused
 func TestManifestCreateRefuseAmend(t *testing.T) {
-	store, cleanup := newTempManifestStore(t)
+	store := store.NewStore(t.TempDir())
-	defer cleanup()
 
 	cli := test.NewFakeCli(nil)
 	cli.SetManifestStore(store)
@@ -87,15 +86,14 @@ func TestManifestCreateRefuseAmend(t *testing.T) {
 
 	cmd := newCreateListCommand(cli)
 	cmd.SetArgs([]string{"example.com/list:v1", "example.com/alpine:3.0"})
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	err = cmd.Execute()
 	assert.Error(t, err, "refusing to amend an existing manifest list with no --amend flag")
 }
 
 // attempt to make a manifest list without valid images
 func TestManifestCreateNoManifest(t *testing.T) {
-	store, cleanup := newTempManifestStore(t)
+	store := store.NewStore(t.TempDir())
-	defer cleanup()
 
 	cli := test.NewFakeCli(nil)
 	cli.SetManifestStore(store)
@@ -110,7 +108,7 @@ func TestManifestCreateNoManifest(t *testing.T) {
 
 	cmd := newCreateListCommand(cli)
 	cmd.SetArgs([]string{"example.com/list:v1", "example.com/alpine:3.0"})
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	err := cmd.Execute()
 	assert.Error(t, err, "No such image: example.com/alpine:3.0")
 }

cli/command/manifest/inspect_test.go

@@ -2,8 +2,7 @@ package manifest
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
-	"os"
 	"testing"
 
 	"github.com/docker/cli/cli/manifest/store"
@@ -21,13 +20,6 @@ import (
 	"gotest.tools/v3/golden"
 )
 
-func newTempManifestStore(t *testing.T) (store.Store, func()) {
-	tmpdir, err := ioutil.TempDir("", "test-manifest-storage")
-	assert.NilError(t, err)
-
-	return store.NewStore(tmpdir), func() { os.RemoveAll(tmpdir) }
-}
-
 func ref(t *testing.T, name string) reference.Named {
 	named, err := reference.ParseNamed("example.com/" + name)
 	assert.NilError(t, err)
@@ -70,22 +62,20 @@ func fullImageManifest(t *testing.T, ref reference.Named) types.ImageManifest {
 }
 
 func TestInspectCommandLocalManifestNotFound(t *testing.T) {
-	store, cleanup := newTempManifestStore(t)
+	store := store.NewStore(t.TempDir())
-	defer cleanup()
 
 	cli := test.NewFakeCli(nil)
 	cli.SetManifestStore(store)
 
 	cmd := newInspectCommand(cli)
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	cmd.SetArgs([]string{"example.com/list:v1", "example.com/alpine:3.0"})
 	err := cmd.Execute()
 	assert.Error(t, err, "No such manifest: example.com/alpine:3.0")
 }
 
 func TestInspectCommandNotFound(t *testing.T) {
-	store, cleanup := newTempManifestStore(t)
+	store := store.NewStore(t.TempDir())
-	defer cleanup()
 
 	cli := test.NewFakeCli(nil)
 	cli.SetManifestStore(store)
@@ -99,15 +89,14 @@ func TestInspectCommandNotFound(t *testing.T) {
 	})
 
 	cmd := newInspectCommand(cli)
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	cmd.SetArgs([]string{"example.com/alpine:3.0"})
 	err := cmd.Execute()
 	assert.Error(t, err, "No such manifest: example.com/alpine:3.0")
 }
 
 func TestInspectCommandLocalManifest(t *testing.T) {
-	store, cleanup := newTempManifestStore(t)
+	store := store.NewStore(t.TempDir())
-	defer cleanup()
 
 	cli := test.NewFakeCli(nil)
 	cli.SetManifestStore(store)
@@ -125,8 +114,7 @@ func TestInspectCommandLocalManifest(t *testing.T) {
 }
 
 func TestInspectcommandRemoteManifest(t *testing.T) {
-	store, cleanup := newTempManifestStore(t)
+	store := store.NewStore(t.TempDir())
-	defer cleanup()
 
 	cli := test.NewFakeCli(nil)
 	cli.SetManifestStore(store)
@@ -137,7 +125,7 @@ func TestInspectcommandRemoteManifest(t *testing.T) {
 	})
 
 	cmd := newInspectCommand(cli)
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	cmd.SetArgs([]string{"example.com/alpine:3.0"})
 	assert.NilError(t, cmd.Execute())
 	actual := cli.OutBuffer()

cli/command/manifest/push_test.go

@@ -2,9 +2,10 @@ package manifest
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 	"testing"
 
+	"github.com/docker/cli/cli/manifest/store"
 	manifesttypes "github.com/docker/cli/cli/manifest/types"
 	"github.com/docker/cli/internal/test"
 	"github.com/docker/distribution/reference"
@@ -42,14 +43,13 @@ func TestManifestPushErrors(t *testing.T) {
 		cli := test.NewFakeCli(nil)
 		cmd := newPushListCommand(cli)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }
 
 func TestManifestPush(t *testing.T) {
-	store, sCleanup := newTempManifestStore(t)
+	store := store.NewStore(t.TempDir())
-	defer sCleanup()
 
 	registry := newFakeRegistryClient()
 

cli/command/manifest/rm_test.go

@@ -1,17 +1,17 @@
 package manifest
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 
+	"github.com/docker/cli/cli/manifest/store"
 	"github.com/docker/cli/internal/test"
 	"gotest.tools/v3/assert"
 )
 
 // create two manifest lists and remove them both
 func TestRmSeveralManifests(t *testing.T) {
-	store, cleanup := newTempManifestStore(t)
+	store := store.NewStore(t.TempDir())
-	defer cleanup()
 
 	cli := test.NewFakeCli(nil)
 	cli.SetManifestStore(store)
@@ -31,7 +31,7 @@ func TestRmSeveralManifests(t *testing.T) {
 
 	cmd := newRmManifestListCommand(cli)
 	cmd.SetArgs([]string{"example.com/first:1", "example.com/second:2"})
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	err = cmd.Execute()
 	assert.NilError(t, err)
 
@@ -43,8 +43,7 @@ func TestRmSeveralManifests(t *testing.T) {
 
 // attempt to remove a manifest list which was never created
 func TestRmManifestNotCreated(t *testing.T) {
-	store, cleanup := newTempManifestStore(t)
+	store := store.NewStore(t.TempDir())
-	defer cleanup()
 
 	cli := test.NewFakeCli(nil)
 	cli.SetManifestStore(store)
@@ -56,7 +55,7 @@ func TestRmManifestNotCreated(t *testing.T) {
 
 	cmd := newRmManifestListCommand(cli)
 	cmd.SetArgs([]string{"example.com/first:1", "example.com/second:2"})
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	err = cmd.Execute()
 	assert.Error(t, err, "No such manifest: example.com/first:1")
 

cli/command/network/connect_test.go

@@ -2,7 +2,7 @@ package network
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -37,7 +37,7 @@ func TestNetworkConnectErrors(t *testing.T) {
 			}),
 		)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 
 	}

cli/command/network/create_test.go

@@ -2,7 +2,7 @@ package network
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 	"strings"
 	"testing"
 
@@ -137,7 +137,7 @@ func TestNetworkCreateErrors(t *testing.T) {
 		for key, value := range tc.flags {
 			assert.NilError(t, cmd.Flags().Set(key, value))
 		}
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 
 	}

cli/command/network/disconnect_test.go

@@ -2,7 +2,7 @@ package network
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -35,7 +35,7 @@ func TestNetworkDisconnectErrors(t *testing.T) {
 			}),
 		)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/network/list_test.go

@@ -2,7 +2,7 @@ package network
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -35,7 +35,7 @@ func TestNetworkListErrors(t *testing.T) {
 				networkListFunc: tc.networkListFunc,
 			}),
 		)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/node/demote_test.go

@@ -1,7 +1,7 @@
 package node
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -43,7 +43,7 @@ func TestNodeDemoteErrors(t *testing.T) {
 				nodeUpdateFunc:  tc.nodeUpdateFunc,
 			}))
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/node/inspect_test.go

@@ -2,7 +2,7 @@ package node
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -73,7 +73,7 @@ func TestNodeInspectErrors(t *testing.T) {
 		for key, value := range tc.flags {
 			cmd.Flags().Set(key, value)
 		}
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/node/list_test.go

@@ -1,7 +1,7 @@
 package node
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/cli/config/configfile"
@@ -47,7 +47,7 @@ func TestNodeListErrorOnAPIFailure(t *testing.T) {
 			infoFunc:     tc.infoFunc,
 		})
 		cmd := newListCommand(cli)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.Error(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/node/promote_test.go

@@ -1,7 +1,7 @@
 package node
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -43,7 +43,7 @@ func TestNodePromoteErrors(t *testing.T) {
 				nodeUpdateFunc:  tc.nodeUpdateFunc,
 			}))
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/node/ps_test.go

@@ -3,7 +3,7 @@ package node
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 	"time"
 
@@ -59,7 +59,7 @@ func TestNodePsErrors(t *testing.T) {
 		for key, value := range tc.flags {
 			cmd.Flags().Set(key, value)
 		}
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.Error(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/node/remove_test.go

@@ -1,7 +1,7 @@
 package node
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -32,7 +32,7 @@ func TestNodeRemoveErrors(t *testing.T) {
 				nodeRemoveFunc: tc.nodeRemoveFunc,
 			}))
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/node/update_test.go

@@ -1,7 +1,7 @@
 package node
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -63,7 +63,7 @@ func TestNodeUpdateErrors(t *testing.T) {
 		for key, value := range tc.flags {
 			cmd.Flags().Set(key, value)
 		}
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/plugin/create_test.go

@@ -3,7 +3,6 @@ package plugin
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"runtime"
 	"testing"
 
@@ -41,7 +40,7 @@ func TestCreateErrors(t *testing.T) {
 		cli := test.NewFakeCli(&fakeClient{})
 		cmd := newCreateCommand(cli)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }
@@ -53,7 +52,7 @@ func TestCreateErrorOnFileAsContextDir(t *testing.T) {
 	cli := test.NewFakeCli(&fakeClient{})
 	cmd := newCreateCommand(cli)
 	cmd.SetArgs([]string{"plugin-foo", tmpFile.Path()})
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	assert.ErrorContains(t, cmd.Execute(), "context must be a directory")
 }
 
@@ -64,7 +63,7 @@ func TestCreateErrorOnContextDirWithoutConfig(t *testing.T) {
 	cli := test.NewFakeCli(&fakeClient{})
 	cmd := newCreateCommand(cli)
 	cmd.SetArgs([]string{"plugin-foo", tmpDir.Path()})
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 
 	expectedErr := "config.json: no such file or directory"
 	if runtime.GOOS == "windows" {
@@ -82,7 +81,7 @@ func TestCreateErrorOnInvalidConfig(t *testing.T) {
 	cli := test.NewFakeCli(&fakeClient{})
 	cmd := newCreateCommand(cli)
 	cmd.SetArgs([]string{"plugin-foo", tmpDir.Path()})
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	assert.ErrorContains(t, cmd.Execute(), "invalid")
 }
 
@@ -100,7 +99,7 @@ func TestCreateErrorFromDaemon(t *testing.T) {
 
 	cmd := newCreateCommand(cli)
 	cmd.SetArgs([]string{"plugin-foo", tmpDir.Path()})
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	assert.ErrorContains(t, cmd.Execute(), "Error creating plugin")
 }
 

cli/command/plugin/disable_test.go

@@ -2,7 +2,7 @@ package plugin
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -40,7 +40,7 @@ func TestPluginDisableErrors(t *testing.T) {
 				pluginDisableFunc: tc.pluginDisableFunc,
 			}))
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/plugin/enable_test.go

@@ -2,7 +2,7 @@ package plugin
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -51,7 +51,7 @@ func TestPluginEnableErrors(t *testing.T) {
 		for key, value := range tc.flags {
 			cmd.Flags().Set(key, value)
 		}
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/plugin/inspect_test.go

@@ -2,7 +2,7 @@ package plugin
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -73,7 +73,7 @@ func TestInspectErrors(t *testing.T) {
 			for key, value := range tc.flags {
 				cmd.Flags().Set(key, value)
 			}
-			cmd.SetOut(ioutil.Discard)
+			cmd.SetOut(io.Discard)
 			assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 		})
 	}

cli/command/plugin/install_test.go

@@ -3,7 +3,6 @@ package plugin
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"strings"
 	"testing"
 
@@ -58,7 +57,7 @@ func TestInstallErrors(t *testing.T) {
 		cli := test.NewFakeCli(&fakeClient{pluginInstallFunc: tc.installFunc})
 		cmd := newInstallCommand(cli)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }
@@ -100,7 +99,7 @@ func TestInstallContentTrustErrors(t *testing.T) {
 		cli.SetNotaryClient(tc.notaryFunc)
 		cmd := newInstallCommand(cli)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }
@@ -117,7 +116,7 @@ func TestInstall(t *testing.T) {
 			args:           []string{"foo"},
 			expectedOutput: "Installed plugin foo\n",
 			installFunc: func(name string, options types.PluginInstallOptions) (io.ReadCloser, error) {
-				return ioutil.NopCloser(strings.NewReader("")), nil
+				return io.NopCloser(strings.NewReader("")), nil
 			},
 		},
 		{
@@ -126,7 +125,7 @@ func TestInstall(t *testing.T) {
 			expectedOutput: "Installed plugin foo\n",
 			installFunc: func(name string, options types.PluginInstallOptions) (io.ReadCloser, error) {
 				assert.Check(t, options.Disabled)
-				return ioutil.NopCloser(strings.NewReader("")), nil
+				return io.NopCloser(strings.NewReader("")), nil
 			},
 		},
 	}

cli/command/plugin/list_test.go

@@ -2,7 +2,7 @@ package plugin
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -52,7 +52,7 @@ func TestListErrors(t *testing.T) {
 		for key, value := range tc.flags {
 			cmd.Flags().Set(key, value)
 		}
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/plugin/remove_test.go

@@ -2,7 +2,7 @@ package plugin
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -37,7 +37,7 @@ func TestRemoveErrors(t *testing.T) {
 		})
 		cmd := newRemoveCommand(cli)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/registry/login.go

@@ -3,7 +3,7 @@ package registry
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"strings"
 
 	"github.com/docker/cli/cli"
@@ -84,7 +84,7 @@ func verifyloginOptions(dockerCli command.Cli, opts *loginOptions) error {
 			return errors.New("Must provide --username with --password-stdin")
 		}
 
-		contents, err := ioutil.ReadAll(dockerCli.In())
+		contents, err := io.ReadAll(dockerCli.In())
 		if err != nil {
 			return err
 		}

cli/command/secret/create.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
@@ -101,7 +100,7 @@ func readSecretData(in io.ReadCloser, file string) ([]byte, error) {
 		}
 		defer in.Close()
 	}
-	data, err := ioutil.ReadAll(in)
+	data, err := io.ReadAll(in)
 	if err != nil {
 		return nil, err
 	}

cli/command/secret/create_test.go

@@ -1,7 +1,8 @@
 package secret
 
 import (
-	"io/ioutil"
+	"io"
+	"os"
 	"path/filepath"
 	"reflect"
 	"strings"
@@ -44,14 +45,14 @@ func TestSecretCreateErrors(t *testing.T) {
 			}),
 		)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }
 
 func TestSecretCreateWithName(t *testing.T) {
 	name := "foo"
-	data, err := ioutil.ReadFile(filepath.Join("testdata", secretDataFile))
+	data, err := os.ReadFile(filepath.Join("testdata", secretDataFile))
 	assert.NilError(t, err)
 
 	expected := swarm.SecretSpec{

cli/command/secret/inspect_test.go

@@ -2,7 +2,7 @@ package secret
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 	"time"
 
@@ -59,7 +59,7 @@ func TestSecretInspectErrors(t *testing.T) {
 		for key, value := range tc.flags {
 			cmd.Flags().Set(key, value)
 		}
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/secret/ls_test.go

@@ -1,7 +1,7 @@
 package secret
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 	"time"
 
@@ -40,7 +40,7 @@ func TestSecretListErrors(t *testing.T) {
 			}),
 		)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/secret/remove_test.go

@@ -1,7 +1,7 @@
 package secret
 
 import (
-	"io/ioutil"
+	"io"
 	"strings"
 	"testing"
 
@@ -36,7 +36,7 @@ func TestSecretRemoveErrors(t *testing.T) {
 			}),
 		)
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }
@@ -72,7 +72,7 @@ func TestSecretRemoveContinueAfterError(t *testing.T) {
 	})
 
 	cmd := newSecretRemoveCommand(cli)
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	cmd.SetArgs(names)
 	assert.Error(t, cmd.Execute(), "error removing secret: foo")
 	assert.Check(t, is.DeepEqual(names, removedSecrets))

cli/command/service/helpers.go

@@ -3,7 +3,6 @@ package service
 import (
 	"context"
 	"io"
-	"io/ioutil"
 
 	"github.com/docker/cli/cli/command"
 	"github.com/docker/cli/cli/command/service/progress"
@@ -21,7 +20,7 @@ func waitOnService(ctx context.Context, dockerCli command.Cli, serviceID string,
 	}()
 
 	if quiet {
-		go io.Copy(ioutil.Discard, pipeReader)
+		go io.Copy(io.Discard, pipeReader)
 		return <-errChan
 	}
 

cli/command/service/rollback_test.go

@@ -3,7 +3,7 @@ package service
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"strings"
 	"testing"
 
@@ -49,7 +49,7 @@ func TestRollback(t *testing.T) {
 		cmd := newRollbackCommand(cli)
 		cmd.SetArgs(tc.args)
 		cmd.Flags().Set("quiet", "true")
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.NilError(t, cmd.Execute())
 		assert.Check(t, is.Equal(strings.TrimSpace(cli.ErrBuffer().String()), tc.expectedDockerCliErr))
 	}
@@ -98,7 +98,7 @@ func TestRollbackWithErrors(t *testing.T) {
 			}))
 		cmd.SetArgs(tc.args)
 		cmd.Flags().Set("quiet", "true")
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/stack/deploy_test.go

@@ -1,7 +1,7 @@
 package stack
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -11,7 +11,7 @@ import (
 func TestDeployWithEmptyName(t *testing.T) {
 	cmd := newDeployCommand(test.NewFakeCli(&fakeClient{}))
 	cmd.SetArgs([]string{"'   '"})
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 
 	assert.ErrorContains(t, cmd.Execute(), `invalid stack name: "'   '"`)
 }

cli/command/stack/list_test.go

@@ -1,7 +1,7 @@
 package stack
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -49,7 +49,7 @@ func TestListErrors(t *testing.T) {
 			serviceListFunc: tc.serviceListFunc,
 		}))
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		for key, value := range tc.flags {
 			cmd.Flags().Set(key, value)
 		}

cli/command/stack/loader/loader.go

@@ -3,7 +3,6 @@ package loader
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"sort"
@@ -132,9 +131,9 @@ func loadConfigFile(filename string, stdin io.Reader) (*composetypes.ConfigFile,
 	var err error
 
 	if filename == "-" {
-		bytes, err = ioutil.ReadAll(stdin)
+		bytes, err = io.ReadAll(stdin)
 	} else {
-		bytes, err = ioutil.ReadFile(filename)
+		bytes, err = os.ReadFile(filename)
 	}
 	if err != nil {
 		return nil, err

cli/command/stack/ps_test.go

@@ -1,7 +1,7 @@
 package stack
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 	"time"
 
@@ -45,7 +45,7 @@ func TestStackPsErrors(t *testing.T) {
 			taskListFunc: tc.taskListFunc,
 		}))
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }
@@ -169,7 +169,7 @@ func TestStackPs(t *testing.T) {
 			for key, value := range tc.flags {
 				cmd.Flags().Set(key, value)
 			}
-			cmd.SetOut(ioutil.Discard)
+			cmd.SetOut(io.Discard)
 
 			if tc.expectedErr != "" {
 				assert.Error(t, cmd.Execute(), tc.expectedErr)

cli/command/stack/remove_test.go

@@ -2,7 +2,7 @@ package stack
 
 import (
 	"errors"
-	"io/ioutil"
+	"io"
 	"strings"
 	"testing"
 
@@ -44,7 +44,7 @@ func fakeClientForRemoveStackTest(version string) *fakeClient {
 func TestRemoveWithEmptyName(t *testing.T) {
 	cmd := newRemoveCommand(test.NewFakeCli(&fakeClient{}))
 	cmd.SetArgs([]string{"good", "'   '", "alsogood"})
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 
 	assert.ErrorContains(t, cmd.Execute(), `invalid stack name: "'   '"`)
 }
@@ -155,7 +155,7 @@ func TestRemoveContinueAfterError(t *testing.T) {
 		},
 	}
 	cmd := newRemoveCommand(test.NewFakeCli(cli))
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 	cmd.SetArgs([]string{"foo", "bar"})
 
 	assert.Error(t, cmd.Execute(), "Failed to remove some resources from stack: foo")

cli/command/stack/services_test.go

@@ -1,7 +1,7 @@
 package stack
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/cli/config/configfile"
@@ -79,7 +79,7 @@ func TestStackServicesErrors(t *testing.T) {
 			for key, value := range tc.flags {
 				cmd.Flags().Set(key, value)
 			}
-			cmd.SetOut(ioutil.Discard)
+			cmd.SetOut(io.Discard)
 			assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 		})
 	}
@@ -88,7 +88,7 @@ func TestStackServicesErrors(t *testing.T) {
 func TestRunServicesWithEmptyName(t *testing.T) {
 	cmd := newServicesCommand(test.NewFakeCli(&fakeClient{}))
 	cmd.SetArgs([]string{"'   '"})
-	cmd.SetOut(ioutil.Discard)
+	cmd.SetOut(io.Discard)
 
 	assert.ErrorContains(t, cmd.Execute(), `invalid stack name: "'   '"`)
 }

cli/command/swarm/ca.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"strings"
 
 	"github.com/docker/cli/cli"
@@ -113,7 +112,7 @@ func attach(ctx context.Context, dockerCli command.Cli, opts caOptions) error {
 	}()
 
 	if opts.quiet {
-		go io.Copy(ioutil.Discard, pipeReader)
+		go io.Copy(io.Discard, pipeReader)
 		return <-errChan
 	}
 

cli/command/swarm/ca_test.go

@@ -2,7 +2,7 @@ package swarm
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"os"
 	"testing"
 	"time"
@@ -65,7 +65,7 @@ type invalidCATestCases struct {
 }
 
 func writeFile(data string) (string, error) {
-	tmpfile, err := ioutil.TempFile("", "testfile")
+	tmpfile, err := os.CreateTemp("", "testfile")
 	if err != nil {
 		return "", err
 	}
@@ -73,15 +73,14 @@ func writeFile(data string) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	tmpfile.Close()
+	return tmpfile.Name(), tmpfile.Close()
-	return tmpfile.Name(), nil
 }
 
 func TestDisplayTrustRootInvalidFlags(t *testing.T) {
 	// we need an actual PEMfile to test
 	tmpfile, err := writeFile(cert)
 	assert.NilError(t, err)
-	defer os.Remove(tmpfile)
+	t.Cleanup(func() { _ = os.Remove(tmpfile) })
 
 	errorTestCases := []invalidCATestCases{
 		{
@@ -145,7 +144,7 @@ func TestDisplayTrustRootInvalidFlags(t *testing.T) {
 				},
 			}))
 		assert.Check(t, cmd.Flags().Parse(testCase.args))
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), testCase.errorMsg)
 	}
 }

cli/command/swarm/init_test.go

@@ -2,7 +2,7 @@ package swarm
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -73,7 +73,7 @@ func TestSwarmInitErrorOnAPIFailure(t *testing.T) {
 		for key, value := range tc.flags {
 			cmd.Flags().Set(key, value)
 		}
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.Error(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/swarm/join_test.go

@@ -1,7 +1,7 @@
 package swarm
 
 import (
-	"io/ioutil"
+	"io"
 	"strings"
 	"testing"
 
@@ -54,7 +54,7 @@ func TestSwarmJoinErrors(t *testing.T) {
 				infoFunc:      tc.infoFunc,
 			}))
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/swarm/join_token_test.go

@@ -2,7 +2,7 @@ package swarm
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -98,7 +98,7 @@ func TestSwarmJoinTokenErrors(t *testing.T) {
 		for key, value := range tc.flags {
 			cmd.Flags().Set(key, value)
 		}
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/swarm/leave_test.go

@@ -1,7 +1,7 @@
 package swarm
 
 import (
-	"io/ioutil"
+	"io"
 	"strings"
 	"testing"
 
@@ -37,7 +37,7 @@ func TestSwarmLeaveErrors(t *testing.T) {
 				swarmLeaveFunc: tc.swarmLeaveFunc,
 			}))
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/swarm/opts.go

@@ -4,7 +4,7 @@ import (
 	"encoding/csv"
 	"encoding/pem"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"
 	"time"
 
@@ -140,7 +140,7 @@ func (p *PEMFile) String() string {
 
 // Set parses a root rotation option
 func (p *PEMFile) Set(value string) error {
-	contents, err := ioutil.ReadFile(value)
+	contents, err := os.ReadFile(value)
 	if err != nil {
 		return err
 	}
@@ -195,7 +195,7 @@ func parseExternalCA(caSpec string) (*swarm.ExternalCA, error) {
 			hasURL = true
 			externalCA.URL = value
 		case "cacert":
-			cacontents, err := ioutil.ReadFile(value)
+			cacontents, err := os.ReadFile(value)
 			if err != nil {
 				return nil, errors.Wrap(err, "unable to read CA cert for external CA")
 			}

cli/command/swarm/unlock_key_test.go

@@ -2,7 +2,7 @@ package swarm
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/docker/cli/internal/test"
@@ -90,7 +90,7 @@ func TestSwarmUnlockKeyErrors(t *testing.T) {
 		for key, value := range tc.flags {
 			cmd.Flags().Set(key, value)
 		}
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/swarm/unlock_test.go

@@ -1,7 +1,7 @@
 package swarm
 
 import (
-	"io/ioutil"
+	"io"
 	"strings"
 	"testing"
 
@@ -70,7 +70,7 @@ func TestSwarmUnlockErrors(t *testing.T) {
 				swarmUnlockFunc: tc.swarmUnlockFunc,
 			}))
 		cmd.SetArgs(tc.args)
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }
@@ -92,7 +92,7 @@ func TestSwarmUnlock(t *testing.T) {
 			return nil
 		},
 	})
-	dockerCli.SetIn(streams.NewIn(ioutil.NopCloser(strings.NewReader(input))))
+	dockerCli.SetIn(streams.NewIn(io.NopCloser(strings.NewReader(input))))
 	cmd := newUnlockCommand(dockerCli)
 	assert.NilError(t, cmd.Execute())
 }

cli/command/swarm/update_test.go

@@ -2,7 +2,7 @@ package swarm
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"testing"
 	"time"
 
@@ -75,7 +75,7 @@ func TestSwarmUpdateErrors(t *testing.T) {
 		for key, value := range tc.flags {
 			cmd.Flags().Set(key, value)
 		}
-		cmd.SetOut(ioutil.Discard)
+		cmd.SetOut(io.Discard)
 		assert.ErrorContains(t, cmd.Execute(), tc.expectedError)
 	}
 }

cli/command/system/events.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"sort"
 	"strings"
 	"text/template"
@@ -100,7 +99,7 @@ func makeTemplate(format string) (*template.Template, error) {
 	}
 	// we execute the template for an empty message, so as to validate
 	// a bad template like "{{.badFieldString}}"
-	return tmpl, tmpl.Execute(ioutil.Discard, &eventtypes.Message{})
+	return tmpl, tmpl.Execute(io.Discard, &eventtypes.Message{})
 }
 
 // rfc3339NanoFixed is similar to time.RFC3339Nano, except it pads nanoseconds