Do not use deprecated io/ioutil package

Author: owen-mc

depstubber.go

@@ -6,7 +6,6 @@ import (
 	"flag"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -153,7 +152,7 @@ func createStubs(packageName string, typeNames []string, funcAndVarNames []strin
 	g.srcFunctions = strings.Join(funcAndVarNames, ",")
 
 	if *copyrightFile != "" {
-		header, err := ioutil.ReadFile(*copyrightFile)
+		header, err := os.ReadFile(*copyrightFile)
 		if err != nil {
 			log.Fatalf("Failed reading copyright file: %v", err)
 		}

reflect.go

@@ -8,7 +8,6 @@ import (
 	"flag"
 	"fmt"
 	"go/build"
-	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
@@ -44,7 +43,7 @@ func writeProgram(importPath string, types []string, values []string) ([]byte, e
 
 // run the given program and parse the output as a model.Package.
 func run(program string) (*model.PackedPkg, error) {
-	f, err := ioutil.TempFile("", "")
+	f, err := os.CreateTemp("", "")
 	if err != nil {
 		return nil, err
 	}
@@ -85,7 +84,7 @@ func run(program string) (*model.PackedPkg, error) {
 // parses the output as a model.Package.
 func runInDir(program []byte, dir string) (*model.PackedPkg, error) {
 	// We use TempDir instead of TempFile so we can control the filename.
-	tmpDir, err := ioutil.TempDir(dir, "depstubber_reflect_")
+	tmpDir, err := os.MkdirTemp(dir, "depstubber_reflect_")
 	if err != nil {
 		return nil, err
 	}
@@ -101,7 +100,7 @@ func runInDir(program []byte, dir string) (*model.PackedPkg, error) {
 		progBinary += ".exe"
 	}
 
-	if err := ioutil.WriteFile(filepath.Join(tmpDir, progSource), program, 0600); err != nil {
+	if err := os.WriteFile(filepath.Join(tmpDir, progSource), program, 0600); err != nil {
 		return nil, err
 	}
 

util.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"runtime/debug"
@@ -23,7 +22,7 @@ func removeDot(s string) string {
 
 // packageNameOfDir get package import path via dir
 func packageNameOfDir(srcDir string) (string, error) {
-	files, err := ioutil.ReadDir(srcDir)
+	files, err := os.ReadDir(srcDir)
 	if err != nil {
 		log.Fatal(err)
 	}

vendor.go

@@ -6,7 +6,6 @@ import (
 	"bytes"
 	"go/parser"
 	"go/token"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -41,7 +40,7 @@ func findModuleRoot(dir string) (root string) {
 }
 
 func loadModFile(filename string) *modfile.File {
-	data, err := ioutil.ReadFile(filename)
+	data, err := os.ReadFile(filename)
 	if err != nil {
 		panic(err)
 	}
@@ -137,7 +136,7 @@ func stubModulesTxt() {
 			log.Fatalf("go mod vendor: %v", err)
 		}
 
-		if err := ioutil.WriteFile(filepath.Join(vdir, "modules.txt"), buf.Bytes(), 0666); err != nil {
+		if err := os.WriteFile(filepath.Join(vdir, "modules.txt"), buf.Bytes(), 0666); err != nil {
 			log.Fatalf("go mod vendor: %v", err)
 		}
 	}