refactor: replace the deprecated function in the ioutil package

alt_exit_test.go

@@ -1,7 +1,6 @@
 package logrus
 
 import (
-	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
@@ -76,14 +75,14 @@ func TestHandler(t *testing.T) {
 	testprog := testprogleader
 	testprog = append(testprog, getPackage()...)
 	testprog = append(testprog, testprogtrailer...)
-	tempDir, err := ioutil.TempDir("", "test_handler")
+	tempDir, err := os.MkdirTemp("", "test_handler")
 	if err != nil {
 		log.Fatalf("can't create temp dir. %q", err)
 	}
 	defer os.RemoveAll(tempDir)
 
 	gofile := filepath.Join(tempDir, "gofile.go")
-	if err := ioutil.WriteFile(gofile, testprog, 0666); err != nil {
+	if err := os.WriteFile(gofile, testprog, 0666); err != nil {
 		t.Fatalf("can't create go file. %q", err)
 	}
 
@@ -94,7 +93,7 @@ func TestHandler(t *testing.T) {
 		t.Fatalf("completed normally, should have failed")
 	}
 
-	data, err := ioutil.ReadFile(outfile)
+	data, err := os.ReadFile(outfile)
 	if err != nil {
 		t.Fatalf("can't read output file %s. %q", outfile, err)
 	}

hooks/test/test.go

@@ -3,7 +3,7 @@
 package test
 
 import (
-	"io/ioutil"
+	"io"
 	"sync"
 
 	"github.com/sirupsen/logrus"
@@ -42,7 +42,7 @@ func NewLocal(logger *logrus.Logger) *Hook {
 func NewNullLogger() (*logrus.Logger, *Hook) {
 
 	logger := logrus.New()
-	logger.Out = ioutil.Discard
+	logger.Out = io.Discard
 
 	return logger, NewLocal(logger)
 

hooks/writer/writer_test.go

@@ -2,7 +2,7 @@ package writer
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"testing"
 
 	log "github.com/sirupsen/logrus"
@@ -16,7 +16,7 @@ func TestDifferentLevelsGoToDifferentWriters(t *testing.T) {
 		DisableTimestamp: true,
 		DisableColors:    true,
 	})
-	log.SetOutput(ioutil.Discard) // Send all logs to nowhere by default
+	log.SetOutput(io.Discard) // Send all logs to nowhere by default
 
 	log.AddHook(&Hook{
 		Writer: &a,

logger_bench_test.go

@@ -1,7 +1,7 @@
 package logrus
 
 import (
-	"io/ioutil"
+	"io"
 	"os"
 	"testing"
 )
@@ -65,7 +65,7 @@ func doLoggerBenchmarkWithFormatter(b *testing.B, f Formatter) {
 	b.SetParallelism(100)
 	log := New()
 	log.Formatter = f
-	log.Out = ioutil.Discard
+	log.Out = io.Discard
 	b.RunParallel(func(pb *testing.PB) {
 		for pb.Next() {
 			log.

logrus_test.go

@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -636,7 +636,7 @@ func TestReplaceHooks(t *testing.T) {
 	old, cur := &TestHook{}, &TestHook{}
 
 	logger := New()
-	logger.SetOutput(ioutil.Discard)
+	logger.SetOutput(io.Discard)
 	logger.AddHook(old)
 
 	hooks := make(LevelHooks)
@@ -781,7 +781,7 @@ func TestReportCallerOnTextFormatter(t *testing.T) {
 
 func TestSetReportCallerRace(t *testing.T) {
 	l := New()
-	l.Out = ioutil.Discard
+	l.Out = io.Discard
 	l.SetReportCaller(true)
 
 	var wg sync.WaitGroup