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>

6 files changed, 10 insertions, 15 deletions

diff --git a/pkg/domain/infra/abi/images.go b/pkg/domain/infra/abi/images.go
index 6934de60e..9ea09e1ec 100644
--- a/pkg/domain/infra/abi/images.go
+++ b/pkg/domain/infra/abi/images.go
@@ -5,7 +5,6 @@ import (
 	"errors"
 	"fmt"
 	"io/fs"
-	"io/ioutil"
 	"net/url"
 	"os"
 	"os/exec"
@@ -340,7 +339,7 @@ func (ir *ImageEngine) Push(ctx context.Context, source string, destination stri
 				return err
 			}
 
-			if err := ioutil.WriteFile(options.DigestFile, []byte(manifestDigest.String()), 0644); err != nil {
+			if err := os.WriteFile(options.DigestFile, []byte(manifestDigest.String()), 0644); err != nil {
 				return err
 			}
 		}
@@ -910,5 +909,5 @@ func putSignature(manifestBlob []byte, mech signature.SigningMechanism, sigStore
 	if err != nil {
 		return err
 	}
-	return ioutil.WriteFile(filepath.Join(signatureDir, sigFilename), newSig, 0644)
+	return os.WriteFile(filepath.Join(signatureDir, sigFilename), newSig, 0644)
 }
diff --git a/pkg/domain/infra/abi/play.go b/pkg/domain/infra/abi/play.go
index d447b4d00..847e81e69 100644
--- a/pkg/domain/infra/abi/play.go
+++ b/pkg/domain/infra/abi/play.go
@@ -6,7 +6,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -116,7 +115,7 @@ func (ic *ContainerEngine) PlayKube(ctx context.Context, body io.Reader, options
 	validKinds := 0
 
 	// read yaml document
-	content, err := ioutil.ReadAll(body)
+	content, err := io.ReadAll(body)
 	if err != nil {
 		return nil, err
 	}
@@ -873,7 +872,7 @@ func (ic *ContainerEngine) playKubePVC(ctx context.Context, pvcYAML *v1.Persiste
 func readConfigMapFromFile(r io.Reader) (v1.ConfigMap, error) {
 	var cm v1.ConfigMap
 
-	content, err := ioutil.ReadAll(r)
+	content, err := io.ReadAll(r)
 	if err != nil {
 		return cm, fmt.Errorf("unable to read ConfigMap YAML content: %w", err)
 	}
@@ -1005,7 +1004,7 @@ func (ic *ContainerEngine) PlayKubeDown(ctx context.Context, body io.Reader, _ e
 	reports := new(entities.PlayKubeReport)
 
 	// read yaml document
-	content, err := ioutil.ReadAll(body)
+	content, err := io.ReadAll(body)
 	if err != nil {
 		return nil, err
 	}
diff --git a/pkg/domain/infra/abi/secrets.go b/pkg/domain/infra/abi/secrets.go
index 47159d65a..4867cbe1c 100644
--- a/pkg/domain/infra/abi/secrets.go
+++ b/pkg/domain/infra/abi/secrets.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"path/filepath"
 	"strings"
 
@@ -14,7 +13,7 @@ import (
 )
 
 func (ic *ContainerEngine) SecretCreate(ctx context.Context, name string, reader io.Reader, options entities.SecretCreateOptions) (*entities.SecretCreateReport, error) {
-	data, _ := ioutil.ReadAll(reader)
+	data, _ := io.ReadAll(reader)
 	secretsPath := ic.Libpod.GetSecretsStorageDir()
 	manager, err := ic.Libpod.SecretsManager()
 	if err != nil {
diff --git a/pkg/domain/infra/abi/trust.go b/pkg/domain/infra/abi/trust.go
index c58ddff06..9b30920d7 100644
--- a/pkg/domain/infra/abi/trust.go
+++ b/pkg/domain/infra/abi/trust.go
@@ -3,7 +3,7 @@ package abi
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"os"
 
 	"github.com/containers/podman/v4/pkg/domain/entities"
 	"github.com/containers/podman/v4/pkg/trust"
@@ -18,7 +18,7 @@ func (ir *ImageEngine) ShowTrust(ctx context.Context, args []string, options ent
 	if len(options.PolicyPath) > 0 {
 		policyPath = options.PolicyPath
 	}
-	report.Raw, err = ioutil.ReadFile(policyPath)
+	report.Raw, err = os.ReadFile(policyPath)
 	if err != nil {
 		return nil, err
 	}
diff --git a/pkg/domain/infra/tunnel/images.go b/pkg/domain/infra/tunnel/images.go
index cc99b1b3a..9ae1ff959 100644
--- a/pkg/domain/infra/tunnel/images.go
+++ b/pkg/domain/infra/tunnel/images.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strconv"
 	"strings"
@@ -264,7 +263,7 @@ func (ir *ImageEngine) Save(ctx context.Context, nameOrID string, tags []string,
 
 	switch opts.Format {
 	case "oci-dir", "docker-dir":
-		f, err = ioutil.TempFile("", "podman_save")
+		f, err = os.CreateTemp("", "podman_save")
 		if err == nil {
 			defer func() { _ = os.Remove(f.Name()) }()
 		}
diff --git a/pkg/domain/utils/scp.go b/pkg/domain/utils/scp.go
index 44a0d94d7..19567551e 100644
--- a/pkg/domain/utils/scp.go
+++ b/pkg/domain/utils/scp.go
@@ -2,7 +2,6 @@ package utils
 
 import (
 	"fmt"
-	"io/ioutil"
 	"net/url"
 	"os"
 	"os/exec"
@@ -29,7 +28,7 @@ func ExecuteTransfer(src, dst string, parentFlags []string, quiet bool, sshMode
 		return nil, nil, nil, nil, err
 	}
 
-	f, err := ioutil.TempFile("", "podman") // open temp file for load/save output
+	f, err := os.CreateTemp("", "podman") // open temp file for load/save output
 	if err != nil {
 		return nil, nil, nil, nil, err
 	}