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>

pkg/api/handlers/compat/containers_export.go

@@ -2,7 +2,6 @@ package compat
 
 import (
 	"fmt"
-	"io/ioutil"
 	"net/http"
 	"os"
 
@@ -19,7 +18,7 @@ func ExportContainer(w http.ResponseWriter, r *http.Request) {
 		utils.ContainerNotFound(w, name, err)
 		return
 	}
-	tmpfile, err := ioutil.TempFile("", "api.tar")
+	tmpfile, err := os.CreateTemp("", "api.tar")
 	if err != nil {
 		utils.Error(w, http.StatusInternalServerError, fmt.Errorf("unable to create tempfile: %w", err))
 		return

pkg/api/handlers/compat/images.go

@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"strings"
@@ -49,7 +48,7 @@ func ExportImage(w http.ResponseWriter, r *http.Request) {
 	// 500 server
 	runtime := r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
 
-	tmpfile, err := ioutil.TempFile("", "api.tar")
+	tmpfile, err := os.CreateTemp("", "api.tar")
 	if err != nil {
 		utils.Error(w, http.StatusInternalServerError, fmt.Errorf("unable to create tempfile: %w", err))
 		return
@@ -193,7 +192,7 @@ func CreateImageFromSrc(w http.ResponseWriter, r *http.Request) {
 	// fromSrc – Source to import. The value may be a URL from which the image can be retrieved or - to read the image from the request body. This parameter may only be used when importing an image.
 	source := query.FromSrc
 	if source == "-" {
-		f, err := ioutil.TempFile("", "api_load.tar")
+		f, err := os.CreateTemp("", "api_load.tar")
 		if err != nil {
 			utils.Error(w, http.StatusInternalServerError, fmt.Errorf("failed to create tempfile: %w", err))
 			return
@@ -480,7 +479,7 @@ func LoadImages(w http.ResponseWriter, r *http.Request) {
 
 	// First write the body to a temporary file that we can later attempt
 	// to load.
-	f, err := ioutil.TempFile("", "api_load.tar")
+	f, err := os.CreateTemp("", "api_load.tar")
 	if err != nil {
 		utils.Error(w, http.StatusInternalServerError, fmt.Errorf("failed to create tempfile: %w", err))
 		return
@@ -547,7 +546,7 @@ func ExportImages(w http.ResponseWriter, r *http.Request) {
 		images[i] = possiblyNormalizedName
 	}
 
-	tmpfile, err := ioutil.TempFile("", "api.tar")
+	tmpfile, err := os.CreateTemp("", "api.tar")
 	if err != nil {
 		utils.Error(w, http.StatusInternalServerError, fmt.Errorf("unable to create tempfile: %w", err))
 		return

pkg/api/handlers/compat/images_build.go

@@ -6,7 +6,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -182,7 +181,7 @@ func BuildImage(w http.ResponseWriter, r *http.Request) {
 	dockerFileSet := false
 	if utils.IsLibpodRequest(r) && query.Remote != "" {
 		// The context directory could be a URL.  Try to handle that.
-		anchorDir, err := ioutil.TempDir(parse.GetTempDir(), "libpod_builder")
+		anchorDir, err := os.MkdirTemp(parse.GetTempDir(), "libpod_builder")
 		if err != nil {
 			utils.InternalServerError(w, err)
 		}
@@ -730,7 +729,7 @@ func BuildImage(w http.ResponseWriter, r *http.Request) {
 	if logrus.IsLevelEnabled(logrus.DebugLevel) {
 		if v, found := os.LookupEnv("PODMAN_RETAIN_BUILD_ARTIFACT"); found {
 			if keep, _ := strconv.ParseBool(v); keep {
-				t, _ := ioutil.TempFile("", "build_*_server")
+				t, _ := os.CreateTemp("", "build_*_server")
 				defer t.Close()
 				body = io.MultiWriter(t, w)
 			}
@@ -852,7 +851,7 @@ func parseLibPodIsolation(isolation string) (buildah.Isolation, error) {
 
 func extractTarFile(r *http.Request) (string, error) {
 	// build a home for the request body
-	anchorDir, err := ioutil.TempDir("", "libpod_builder")
+	anchorDir, err := os.MkdirTemp("", "libpod_builder")
 	if err != nil {
 		return "", err
 	}

pkg/api/handlers/compat/images_push.go

@@ -4,8 +4,9 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
+	"os"
 	"strings"
 
 	"github.com/containers/image/v5/types"
@@ -26,7 +27,7 @@ func PushImage(w http.ResponseWriter, r *http.Request) {
 	decoder := r.Context().Value(api.DecoderKey).(*schema.Decoder)
 	runtime := r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
 
-	digestFile, err := ioutil.TempFile("", "digest.txt")
+	digestFile, err := os.CreateTemp("", "digest.txt")
 	if err != nil {
 		utils.Error(w, http.StatusInternalServerError, fmt.Errorf("unable to create tempfile: %w", err))
 		return
@@ -186,7 +187,7 @@ loop: // break out of for/select infinite loop
 				break loop
 			}
 
-			digestBytes, err := ioutil.ReadAll(digestFile)
+			digestBytes, err := io.ReadAll(digestFile)
 			if err != nil {
 				report.Error = &jsonmessage.JSONError{
 					Message: err.Error(),

pkg/api/handlers/libpod/containers.go

@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"strings"
@@ -248,7 +247,7 @@ func Checkpoint(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if query.Export {
-		f, err := ioutil.TempFile("", "checkpoint")
+		f, err := os.CreateTemp("", "checkpoint")
 		if err != nil {
 			utils.InternalServerError(w, err)
 			return
@@ -329,7 +328,7 @@ func Restore(w http.ResponseWriter, r *http.Request) {
 
 	var names []string
 	if query.Import {
-		t, err := ioutil.TempFile("", "restore")
+		t, err := os.CreateTemp("", "restore")
 		if err != nil {
 			utils.InternalServerError(w, err)
 			return

pkg/api/handlers/libpod/images.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"strconv"
@@ -182,7 +181,7 @@ func ExportImage(w http.ResponseWriter, r *http.Request) {
 
 	switch query.Format {
 	case define.OCIArchive, define.V2s2Archive:
-		tmpfile, err := ioutil.TempFile("", "api.tar")
+		tmpfile, err := os.CreateTemp("", "api.tar")
 		if err != nil {
 			utils.Error(w, http.StatusInternalServerError, fmt.Errorf("unable to create tempfile: %w", err))
 			return
@@ -193,7 +192,7 @@ func ExportImage(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 	case define.OCIManifestDir, define.V2s2ManifestDir:
-		tmpdir, err := ioutil.TempDir("", "save")
+		tmpdir, err := os.MkdirTemp("", "save")
 		if err != nil {
 			utils.Error(w, http.StatusInternalServerError, fmt.Errorf("unable to create tempdir: %w", err))
 			return
@@ -279,7 +278,7 @@ func ExportImages(w http.ResponseWriter, r *http.Request) {
 
 	switch query.Format {
 	case define.V2s2Archive, define.OCIArchive:
-		tmpfile, err := ioutil.TempFile("", "api.tar")
+		tmpfile, err := os.CreateTemp("", "api.tar")
 		if err != nil {
 			utils.Error(w, http.StatusInternalServerError, fmt.Errorf("unable to create tempfile: %w", err))
 			return
@@ -290,7 +289,7 @@ func ExportImages(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 	case define.OCIManifestDir, define.V2s2ManifestDir:
-		tmpdir, err := ioutil.TempDir("", "save")
+		tmpdir, err := os.MkdirTemp("", "save")
 		if err != nil {
 			utils.Error(w, http.StatusInternalServerError, fmt.Errorf("unable to create tmpdir: %w", err))
 			return
@@ -329,7 +328,7 @@ func ExportImages(w http.ResponseWriter, r *http.Request) {
 func ImagesLoad(w http.ResponseWriter, r *http.Request) {
 	runtime := r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
 
-	tmpfile, err := ioutil.TempFile("", "libpod-images-load.tar")
+	tmpfile, err := os.CreateTemp("", "libpod-images-load.tar")
 	if err != nil {
 		utils.Error(w, http.StatusInternalServerError, fmt.Errorf("unable to create tempfile: %w", err))
 		return
@@ -378,7 +377,7 @@ func ImagesImport(w http.ResponseWriter, r *http.Request) {
 	// Check if we need to load the image from a URL or from the request's body.
 	source := query.URL
 	if len(query.URL) == 0 {
-		tmpfile, err := ioutil.TempFile("", "libpod-images-import.tar")
+		tmpfile, err := os.CreateTemp("", "libpod-images-import.tar")
 		if err != nil {
 			utils.Error(w, http.StatusInternalServerError, fmt.Errorf("unable to create tempfile: %w", err))
 			return

pkg/api/handlers/libpod/manifests.go

@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"strconv"
@@ -83,7 +83,7 @@ func ManifestCreate(w http.ResponseWriter, r *http.Request) {
 		status = http.StatusCreated
 	}
 
-	buffer, err := ioutil.ReadAll(r.Body)
+	buffer, err := io.ReadAll(r.Body)
 	if err != nil {
 		utils.InternalServerError(w, err)
 		return

pkg/api/server/handler_logging.go

@@ -2,7 +2,6 @@ package server
 
 import (
 	"io"
-	"io/ioutil"
 	"net/http"
 	"time"
 
@@ -41,7 +40,7 @@ func loggingHandler() mux.MiddlewareFunc {
 				"API":            "request",
 				"X-Reference-Id": r.Header.Get("X-Reference-Id"),
 			})
-			r.Body = ioutil.NopCloser(
+			r.Body = io.NopCloser(
 				io.TeeReader(r.Body, annotated.WriterLevel(logrus.TraceLevel)))
 
 			w = responseWriter{ResponseWriter: w}

pkg/api/server/handler_rid.go

@@ -2,7 +2,7 @@ package server
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 
 	"github.com/containers/podman/v4/pkg/api/types"
@@ -17,7 +17,7 @@ import (
 func referenceIDHandler() mux.MiddlewareFunc {
 	return func(h http.Handler) http.Handler {
 		// Only log Apache access_log-like entries at Info level or below
-		out := ioutil.Discard
+		out := io.Discard
 		if logrus.IsLevelEnabled(logrus.InfoLevel) {
 			out = logrus.StandardLogger().Out
 		}