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)
 	}