Replace deprecated ioutil

Package `io/ioutil` was deprecated in golang 1.16, preventing podman from
building under Fedora 37.  Fortunately, functionality identical
replacements are provided by the packages `io` and `os`.  Replace all
usage of all `io/ioutil` symbols with appropriate substitutions
according to the golang docs.

Signed-off-by: Chris Evich <cevich@redhat.com>

cmd/podman-mac-helper/main.go

@@ -7,7 +7,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"regexp"
@@ -131,7 +130,7 @@ func readCapped(reader io.Reader) string {
 	// Cap output
 	buffer := make([]byte, 2048)
 	n, _ := io.ReadFull(reader, buffer)
-	_, _ = io.Copy(ioutil.Discard, reader)
+	_, _ = io.Copy(io.Discard, reader)
 	if n > 0 {
 		return string(buffer[:n])
 	}

cmd/podman/containers/commit.go

@@ -3,7 +3,6 @@ package containers
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strings"
 
@@ -107,7 +106,7 @@ func commit(cmd *cobra.Command, args []string) error {
 		return err
 	}
 	if len(iidFile) > 0 {
-		if err = ioutil.WriteFile(iidFile, []byte(response.Id), 0644); err != nil {
+		if err = os.WriteFile(iidFile, []byte(response.Id), 0644); err != nil {
 			return fmt.Errorf("failed to write image ID: %w", err)
 		}
 	}

cmd/podman/containers/cp.go

@@ -3,7 +3,6 @@ package containers
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"os/user"
 	"path/filepath"
@@ -379,7 +378,7 @@ func copyToContainer(container string, containerPath string, hostPath string) er
 		// Copy from stdin to a temporary file *before* throwing it
 		// over the wire.  This allows for proper client-side error
 		// reporting.
-		tmpFile, err := ioutil.TempFile("", "")
+		tmpFile, err := os.CreateTemp("", "")
 		if err != nil {
 			return err
 		}

cmd/podman/containers/kill.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"
 
 	"github.com/containers/common/pkg/completion"
@@ -96,7 +96,7 @@ func kill(_ *cobra.Command, args []string) error {
 		return errors.New("valid signals are 1 through 64")
 	}
 	for _, cidFile := range killCidFiles {
-		content, err := ioutil.ReadFile(cidFile)
+		content, err := os.ReadFile(cidFile)
 		if err != nil {
 			return fmt.Errorf("reading CIDFile: %w", err)
 		}

cmd/podman/containers/pause.go

@@ -3,7 +3,7 @@ package containers
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"
 
 	"github.com/containers/common/pkg/completion"
@@ -92,7 +92,7 @@ func pause(cmd *cobra.Command, args []string) error {
 	)
 
 	for _, cidFile := range pauseCidFiles {
-		content, err := ioutil.ReadFile(cidFile)
+		content, err := os.ReadFile(cidFile)
 		if err != nil {
 			return fmt.Errorf("reading CIDFile: %w", err)
 		}

cmd/podman/containers/restart.go

@@ -3,7 +3,7 @@ package containers
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"
 
 	"github.com/containers/common/pkg/completion"
@@ -105,7 +105,7 @@ func restart(cmd *cobra.Command, args []string) error {
 	}
 
 	for _, cidFile := range restartCidFiles {
-		content, err := ioutil.ReadFile(cidFile)
+		content, err := os.ReadFile(cidFile)
 		if err != nil {
 			return fmt.Errorf("reading CIDFile: %w", err)
 		}

cmd/podman/containers/rm.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"
 
 	"github.com/containers/common/pkg/completion"
@@ -108,7 +108,7 @@ func rm(cmd *cobra.Command, args []string) error {
 		rmOptions.Timeout = &stopTimeout
 	}
 	for _, cidFile := range rmCidFiles {
-		content, err := ioutil.ReadFile(cidFile)
+		content, err := os.ReadFile(cidFile)
 		if err != nil {
 			return fmt.Errorf("reading CIDFile: %w", err)
 		}

cmd/podman/containers/stop.go

@@ -3,7 +3,7 @@ package containers
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"
 
 	"github.com/containers/common/pkg/completion"
@@ -105,7 +105,7 @@ func stop(cmd *cobra.Command, args []string) error {
 		stopOptions.Timeout = &stopTimeout
 	}
 	for _, cidFile := range stopCidFiles {
-		content, err := ioutil.ReadFile(cidFile)
+		content, err := os.ReadFile(cidFile)
 		if err != nil {
 			return fmt.Errorf("reading CIDFile: %w", err)
 		}

cmd/podman/containers/unpause.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"
 
 	"github.com/containers/common/pkg/cgroups"
@@ -99,7 +99,7 @@ func unpause(cmd *cobra.Command, args []string) error {
 	}
 
 	for _, cidFile := range unpauseCidFiles {
-		content, err := ioutil.ReadFile(cidFile)
+		content, err := os.ReadFile(cidFile)
 		if err != nil {
 			return fmt.Errorf("reading CIDFile: %w", err)
 		}

cmd/podman/generate/spec.go

@@ -2,7 +2,7 @@ package generate
 
 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 
 	"github.com/containers/common/pkg/completion"
 	"github.com/containers/podman/v4/cmd/podman/common"
@@ -59,7 +59,7 @@ func spec(cmd *cobra.Command, args []string) error {
 	// if we are looking to print the output, do not mess it up by printing the path
 	// if we are using -v the user probably expects to pipe the output somewhere else
 	if len(opts.FileName) > 0 {
-		err = ioutil.WriteFile(opts.FileName, report.Data, 0644)
+		err = os.WriteFile(opts.FileName, report.Data, 0644)
 		if err != nil {
 			return err
 		}

cmd/podman/images/build.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -635,7 +634,7 @@ func getDecryptConfig(decryptionKeys []string) (*encconfig.DecryptConfig, error)
 
 func parseDockerignore(ignoreFile string) ([]string, error) {
 	excludes := []string{}
-	ignore, err := ioutil.ReadFile(ignoreFile)
+	ignore, err := os.ReadFile(ignoreFile)
 	if err != nil {
 		return excludes, err
 	}

cmd/podman/images/import.go

@@ -5,7 +5,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"strings"
 
@@ -116,7 +115,7 @@ func importCon(cmd *cobra.Command, args []string) error {
 	}
 
 	if source == "-" {
-		outFile, err := ioutil.TempFile("", "podman")
+		outFile, err := os.CreateTemp("", "podman")
 		if err != nil {
 			return fmt.Errorf("creating file %v", err)
 		}

cmd/podman/images/load.go

@@ -5,7 +5,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"strings"
 
@@ -93,7 +92,7 @@ func load(cmd *cobra.Command, args []string) error {
 		if term.IsTerminal(int(os.Stdin.Fd())) {
 			return errors.New("cannot read from terminal, use command-line redirection or the --input flag")
 		}
-		outFile, err := ioutil.TempFile(util.Tmpdir(), "podman")
+		outFile, err := os.CreateTemp(util.Tmpdir(), "podman")
 		if err != nil {
 			return fmt.Errorf("creating file %v", err)
 		}

cmd/podman/images/utils_linux.go

@@ -3,7 +3,6 @@ package images
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -16,7 +15,7 @@ import (
 // the caller should use the returned function to clean up the pipeDir
 func setupPipe() (string, func() <-chan error, error) {
 	errc := make(chan error)
-	pipeDir, err := ioutil.TempDir(os.TempDir(), "pipeDir")
+	pipeDir, err := os.MkdirTemp(os.TempDir(), "pipeDir")
 	if err != nil {
 		return "", nil, err
 	}

cmd/podman/kube/generate.go

@@ -3,7 +3,6 @@ package kube
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 
 	"github.com/containers/common/pkg/completion"
@@ -77,7 +76,7 @@ func generateKube(cmd *cobra.Command, args []string) error {
 	if err != nil {
 		return err
 	}
-	content, err := ioutil.ReadAll(report.Reader)
+	content, err := io.ReadAll(report.Reader)
 	if err != nil {
 		return err
 	}
@@ -89,7 +88,7 @@ func generateKube(cmd *cobra.Command, args []string) error {
 		if _, err := os.Stat(generateFile); err == nil {
 			return fmt.Errorf("cannot write to %q; file exists", generateFile)
 		}
-		if err := ioutil.WriteFile(generateFile, content, 0644); err != nil {
+		if err := os.WriteFile(generateFile, content, 0644); err != nil {
 			return fmt.Errorf("cannot write to %q: %w", generateFile, err)
 		}
 		return nil

cmd/podman/kube/play.go

@@ -5,7 +5,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net"
 	"net/http"
 	"os"
@@ -284,7 +283,7 @@ func readerFromArg(fileName string) (*bytes.Reader, error) {
 		}
 		defer response.Body.Close()
 
-		data, err := ioutil.ReadAll(response.Body)
+		data, err := io.ReadAll(response.Body)
 		if err != nil {
 			return nil, err
 		}

cmd/podman/manifest/push.go

@@ -3,7 +3,6 @@ package manifest
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 
 	"github.com/containers/common/pkg/auth"
@@ -149,7 +148,7 @@ func push(cmd *cobra.Command, args []string) error {
 		return err
 	}
 	if manifestPushOpts.DigestFile != "" {
-		if err := ioutil.WriteFile(manifestPushOpts.DigestFile, []byte(digest), 0644); err != nil {
+		if err := os.WriteFile(manifestPushOpts.DigestFile, []byte(digest), 0644); err != nil {
 			return err
 		}
 	}

cmd/podman/parse/net_test.go

@@ -3,7 +3,6 @@
 package parse
 
 import (
-	"io/ioutil"
 	"os"
 	"testing"
 
@@ -15,7 +14,7 @@ var (
 )
 
 func createTmpFile(content []byte) (string, error) {
-	tmpfile, err := ioutil.TempFile(os.TempDir(), "unittest")
+	tmpfile, err := os.CreateTemp(os.TempDir(), "unittest")
 	if err != nil {
 		return "", err
 	}

cmd/podman/pods/create.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"runtime"
 	"sort"
@@ -300,7 +299,7 @@ func create(cmd *cobra.Command, args []string) error {
 	}
 
 	if len(podIDFile) > 0 {
-		if err = ioutil.WriteFile(podIDFile, []byte(response.Id), 0644); err != nil {
+		if err = os.WriteFile(podIDFile, []byte(response.Id), 0644); err != nil {
 			return fmt.Errorf("failed to write pod ID to file: %w", err)
 		}
 	}

cmd/rootlessport/main.go

@@ -9,7 +9,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net"
 	"os"
 	"os/exec"
@@ -50,7 +49,7 @@ func main() {
 }
 
 func loadConfig(r io.Reader) (*rootlessport.Config, io.ReadCloser, io.WriteCloser, error) {
-	stdin, err := ioutil.ReadAll(r)
+	stdin, err := io.ReadAll(r)
 	if err != nil {
 		return nil, nil, nil, err
 	}
@@ -92,7 +91,7 @@ func parent() error {
 	}
 
 	// create the parent driver
-	stateDir, err := ioutil.TempDir(cfg.TmpDir, "rootlessport")
+	stateDir, err := os.MkdirTemp(cfg.TmpDir, "rootlessport")
 	if err != nil {
 		return err
 	}
@@ -240,7 +239,7 @@ outer:
 
 	// wait for ExitFD to be closed
 	logrus.Info("Waiting for exitfd to be closed")
-	if _, err := ioutil.ReadAll(exitR); err != nil {
+	if _, err := io.ReadAll(exitR); err != nil {
 		return err
 	}
 	return nil
@@ -357,7 +356,7 @@ func child() error {
 	}()
 
 	// wait for stdin to be closed
-	if _, err := ioutil.ReadAll(os.Stdin); err != nil {
+	if _, err := io.ReadAll(os.Stdin); err != nil {
 		return err
 	}
 	return nil