cli/command/swarm: remove deprecated io/ioutil and use t.TempDir()

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 78cb61c61c)
Signed-off-by: Cory Snider <csnider@mirantis.com>

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(), nil
+	return tmpfile.Name(), tmpfile.Close()
 }
 
 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)
 	}
 }