all: replace uses of ioutil with io and os (#24869)

cmd/ethkey/changepassword.go

@@ -18,7 +18,7 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"
 
 	"github.com/ethereum/go-ethereum/accounts/keystore"
@@ -45,7 +45,7 @@ Change the password of a keyfile.`,
 		keyfilepath := ctx.Args().First()
 
 		// Read key from file.
-		keyjson, err := ioutil.ReadFile(keyfilepath)
+		keyjson, err := os.ReadFile(keyfilepath)
 		if err != nil {
 			utils.Fatalf("Failed to read the keyfile at '%s': %v", keyfilepath, err)
 		}
@@ -61,7 +61,7 @@ Change the password of a keyfile.`,
 		fmt.Println("Please provide a new password")
 		var newPhrase string
 		if passFile := ctx.String(newPassphraseFlag.Name); passFile != "" {
-			content, err := ioutil.ReadFile(passFile)
+			content, err := os.ReadFile(passFile)
 			if err != nil {
 				utils.Fatalf("Failed to read new password file '%s': %v", passFile, err)
 			}
@@ -77,7 +77,7 @@ Change the password of a keyfile.`,
 		}
 
 		// Then write the new keyfile in place of the old one.
-		if err := ioutil.WriteFile(keyfilepath, newJson, 0600); err != nil {
+		if err := os.WriteFile(keyfilepath, newJson, 0600); err != nil {
 			utils.Fatalf("Error writing new keyfile to disk: %v", err)
 		}
 

cmd/ethkey/generate.go

@@ -19,7 +19,6 @@ package main
 import (
 	"crypto/ecdsa"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -116,7 +115,7 @@ If you want to encrypt an existing private key, it can be specified by setting
 		if err := os.MkdirAll(filepath.Dir(keyfilepath), 0700); err != nil {
 			utils.Fatalf("Could not create directory %s", filepath.Dir(keyfilepath))
 		}
-		if err := ioutil.WriteFile(keyfilepath, keyjson, 0600); err != nil {
+		if err := os.WriteFile(keyfilepath, keyjson, 0600); err != nil {
 			utils.Fatalf("Failed to write keyfile to %s: %v", keyfilepath, err)
 		}
 

cmd/ethkey/inspect.go

@@ -19,7 +19,7 @@ package main
 import (
 	"encoding/hex"
 	"fmt"
-	"io/ioutil"
+	"os"
 
 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/cmd/utils"
@@ -58,7 +58,7 @@ make sure to use this feature with great caution!`,
 		keyfilepath := ctx.Args().First()
 
 		// Read key from file.
-		keyjson, err := ioutil.ReadFile(keyfilepath)
+		keyjson, err := os.ReadFile(keyfilepath)
 		if err != nil {
 			utils.Fatalf("Failed to read the keyfile at '%s': %v", keyfilepath, err)
 		}

cmd/ethkey/message.go

@@ -19,7 +19,7 @@ package main
 import (
 	"encoding/hex"
 	"fmt"
-	"io/ioutil"
+	"os"
 
 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/cmd/utils"
@@ -56,7 +56,7 @@ To sign a message contained in a file, use the --msgfile flag.
 
 		// Load the keyfile.
 		keyfilepath := ctx.Args().First()
-		keyjson, err := ioutil.ReadFile(keyfilepath)
+		keyjson, err := os.ReadFile(keyfilepath)
 		if err != nil {
 			utils.Fatalf("Failed to read the keyfile at '%s': %v", keyfilepath, err)
 		}
@@ -146,7 +146,7 @@ func getMessage(ctx *cli.Context, msgarg int) []byte {
 		if len(ctx.Args()) > msgarg {
 			utils.Fatalf("Can't use --msgfile and message argument at the same time.")
 		}
-		msg, err := ioutil.ReadFile(file)
+		msg, err := os.ReadFile(file)
 		if err != nil {
 			utils.Fatalf("Can't read message file: %v", err)
 		}

cmd/ethkey/utils.go

@@ -19,7 +19,7 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"
 
 	"github.com/ethereum/go-ethereum/cmd/utils"
@@ -34,7 +34,7 @@ func getPassphrase(ctx *cli.Context, confirmation bool) string {
 	// Look for the --passwordfile flag.
 	passphraseFile := ctx.String(passphraseFlag.Name)
 	if passphraseFile != "" {
-		content, err := ioutil.ReadFile(passphraseFile)
+		content, err := os.ReadFile(passphraseFile)
 		if err != nil {
 			utils.Fatalf("Failed to read password file '%s': %v",
 				passphraseFile, err)