remove ioutil usage in all project

Signed-off-by: yxxhero <aiopsclub@163.com>

pkg/app/app.go

@@ -3,7 +3,6 @@ package app
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"os"
 	"os/signal"
@@ -87,7 +86,7 @@ func New(conf ConfigProvider) *App {
 }
 
 func Init(app *App) *App {
-	app.readFile = ioutil.ReadFile
+	app.readFile = os.ReadFile
 	app.deleteFile = os.Remove
 	app.glob = filepath.Glob
 	app.abs = filepath.Abs

pkg/app/run.go

@@ -2,7 +2,6 @@ package app
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"sort"
 	"strings"
@@ -52,7 +51,7 @@ func (r *Run) withPreparedCharts(helmfileCommand string, opts state.ChartPrepare
 	// Create tmp directory and bail immediately if it fails
 	var dir string
 	if len(opts.OutputDir) == 0 {
-		tempDir, err := ioutil.TempDir("", "helmfile*")
+		tempDir, err := os.MkdirTemp("", "helmfile*")
 		if err != nil {
 			return err
 		}

pkg/app/snapshot_test.go

@@ -1,7 +1,6 @@
 package app
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"reflect"
@@ -24,7 +23,7 @@ func assertEqualsToSnapshot(t *testing.T, name string, data string) {
 		return
 	}
 
-	wantData, err := ioutil.ReadFile(snapshotFileName)
+	wantData, err := os.ReadFile(snapshotFileName)
 	if err != nil {
 		t.Fatalf(
 			"Snapshot file %q does not exist. Rerun this test with `HELMFILE_UPDATE_SNAPSHOT=1 go test -v -run %s %s` to create the snapshot",
@@ -53,7 +52,7 @@ func update(t *testing.T, snapshotFileName string, data []byte) {
 		t.Fatalf("%v", err)
 	}
 
-	if err := ioutil.WriteFile(snapshotFileName, data, 0644); err != nil {
+	if err := os.WriteFile(snapshotFileName, data, 0644); err != nil {
 		t.Fatalf("%v", err)
 	}
 }