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

core/rawdb/accessors_chain_test.go

@@ -20,9 +20,9 @@ import (
 	"bytes"
 	"encoding/hex"
 	"fmt"
-	"io/ioutil"
 	"math/big"
 	"math/rand"
+	"os"
 	"reflect"
 	"testing"
 
@@ -852,7 +852,7 @@ func TestDeriveLogFields(t *testing.T) {
 
 func BenchmarkDecodeRLPLogs(b *testing.B) {
 	// Encoded receipts from block 0x14ee094309fbe8f70b65f45ebcc08fb33f126942d97464aad5eb91cfd1e2d269
-	buf, err := ioutil.ReadFile("testdata/stored_receipts.bin")
+	buf, err := os.ReadFile("testdata/stored_receipts.bin")
 	if err != nil {
 		b.Fatal(err)
 	}

core/rawdb/freezer_meta_test.go

@@ -17,13 +17,12 @@
 package rawdb
 
 import (
-	"io/ioutil"
 	"os"
 	"testing"
 )
 
 func TestReadWriteFreezerTableMeta(t *testing.T) {
-	f, err := ioutil.TempFile(os.TempDir(), "*")
+	f, err := os.CreateTemp(os.TempDir(), "*")
 	if err != nil {
 		t.Fatalf("Failed to create file %v", err)
 	}
@@ -44,7 +43,7 @@ func TestReadWriteFreezerTableMeta(t *testing.T) {
 }
 
 func TestInitializeFreezerTableMeta(t *testing.T) {
-	f, err := ioutil.TempFile(os.TempDir(), "*")
+	f, err := os.CreateTemp(os.TempDir(), "*")
 	if err != nil {
 		t.Fatalf("Failed to create file %v", err)
 	}

core/rawdb/freezer_utils.go

@@ -18,7 +18,6 @@ package rawdb
 
 import (
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 )
@@ -30,7 +29,7 @@ import (
 // It is perfectly valid to have destPath == srcPath.
 func copyFrom(srcPath, destPath string, offset uint64, before func(f *os.File) error) error {
 	// Create a temp file in the same dir where we want it to wind up
-	f, err := ioutil.TempFile(filepath.Dir(destPath), "*")
+	f, err := os.CreateTemp(filepath.Dir(destPath), "*")
 	if err != nil {
 		return err
 	}

core/rawdb/freezer_utils_test.go

@@ -18,7 +18,6 @@ package rawdb
 
 import (
 	"bytes"
-	"io/ioutil"
 	"os"
 	"testing"
 )
@@ -44,7 +43,7 @@ func TestCopyFrom(t *testing.T) {
 		{"foo", "bar", 8, true},
 	}
 	for _, c := range cases {
-		ioutil.WriteFile(c.src, content, 0644)
+		os.WriteFile(c.src, content, 0644)
 
 		if err := copyFrom(c.src, c.dest, c.offset, func(f *os.File) error {
 			if !c.writePrefix {
@@ -57,7 +56,7 @@ func TestCopyFrom(t *testing.T) {
 			t.Fatalf("Failed to copy %v", err)
 		}
 
-		blob, err := ioutil.ReadFile(c.dest)
+		blob, err := os.ReadFile(c.dest)
 		if err != nil {
 			os.Remove(c.src)
 			os.Remove(c.dest)

core/tx_pool_test.go

@@ -20,7 +20,6 @@ import (
 	"crypto/ecdsa"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"math/big"
 	"math/rand"
 	"os"
@@ -2243,7 +2242,7 @@ func testTransactionJournaling(t *testing.T, nolocals bool) {
 	t.Parallel()
 
 	// Create a temporary file for the journal
-	file, err := ioutil.TempFile("", "")
+	file, err := os.CreateTemp("", "")
 	if err != nil {
 		t.Fatalf("failed to create temporary journal: %v", err)
 	}

core/vm/contracts_test.go

@@ -20,7 +20,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"testing"
 	"time"
 
@@ -334,7 +334,7 @@ func TestPrecompiledBLS12381MapG1Fail(t *testing.T)      { testJsonFail("blsMapG
 func TestPrecompiledBLS12381MapG2Fail(t *testing.T)      { testJsonFail("blsMapG2", "12", t) }
 
 func loadJson(name string) ([]precompiledTest, error) {
-	data, err := ioutil.ReadFile(fmt.Sprintf("testdata/precompiles/%v.json", name))
+	data, err := os.ReadFile(fmt.Sprintf("testdata/precompiles/%v.json", name))
 	if err != nil {
 		return nil, err
 	}
@@ -344,7 +344,7 @@ func loadJson(name string) ([]precompiledTest, error) {
 }
 
 func loadJsonFail(name string) ([]precompiledFailureTest, error) {
-	data, err := ioutil.ReadFile(fmt.Sprintf("testdata/precompiles/fail-%v.json", name))
+	data, err := os.ReadFile(fmt.Sprintf("testdata/precompiles/fail-%v.json", name))
 	if err != nil {
 		return nil, err
 	}

core/vm/instructions_test.go

@@ -20,8 +20,8 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"math/big"
+	"os"
 	"testing"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -260,7 +260,7 @@ func TestWriteExpectedValues(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		_ = ioutil.WriteFile(fmt.Sprintf("testdata/testcases_%v.json", name), data, 0644)
+		_ = os.WriteFile(fmt.Sprintf("testdata/testcases_%v.json", name), data, 0644)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -270,7 +270,7 @@ func TestWriteExpectedValues(t *testing.T) {
 // TestJsonTestcases runs through all the testcases defined as json-files
 func TestJsonTestcases(t *testing.T) {
 	for name := range twoOpMethods {
-		data, err := ioutil.ReadFile(fmt.Sprintf("testdata/testcases_%v.json", name))
+		data, err := os.ReadFile(fmt.Sprintf("testdata/testcases_%v.json", name))
 		if err != nil {
 			t.Fatal("Failed to read file", err)
 		}