Fix race condition in temporary files

benchmark/data.go

@@ -3,10 +3,10 @@
 package benchmark
 
 import (
-	"io/ioutil"
+	"os"
 )
 
-var largeStructText, _ = ioutil.ReadFile("example.json")
+var largeStructText, _ = os.ReadFile("example.json")
 var xlStructData XLStruct
 
 func init() {

bootstrap/bootstrap.go

@@ -8,7 +8,6 @@ package bootstrap
 import (
 	"fmt"
 	"go/format"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -88,7 +87,7 @@ func (g *Generator) writeStub() error {
 
 // writeMain creates a .go file that launches the generator if 'go run'.
 func (g *Generator) writeMain() (path string, err error) {
-	f, err := ioutil.TempFile(filepath.Dir(g.OutName), "easyjson-bootstrap")
+	f, err := os.CreateTemp(filepath.Dir(g.OutName), "easyjson-bootstrap-*")
 	if err != nil {
 		return "", err
 	}
@@ -211,13 +210,13 @@ func (g *Generator) Run() error {
 	}
 
 	// format file and write to out path
-	in, err := ioutil.ReadFile(f.Name())
+	in, err := os.ReadFile(f.Name())
 	if err != nil {
 		return err
 	}
 	out, err := format.Source(in)
 	if err != nil {
 		return err
 	}
-	return ioutil.WriteFile(g.OutName, out, 0644)
+	return os.WriteFile(g.OutName, out, 0644)
 }

helpers.go

@@ -3,7 +3,6 @@ package easyjson
 
 import (
 	"io"
-	"io/ioutil"
 	"net/http"
 	"strconv"
 	"unsafe"
@@ -109,7 +108,7 @@ func Unmarshal(data []byte, v Unmarshaler) error {
 
 // UnmarshalFromReader reads all the data in the reader and decodes as JSON into the object.
 func UnmarshalFromReader(r io.Reader, v Unmarshaler) error {
-	data, err := ioutil.ReadAll(r)
+	data, err := io.ReadAll(r)
 	if err != nil {
 		return err
 	}

parser/pkgpath.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"fmt"
 	"go/build"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path"
@@ -111,7 +110,7 @@ func getModulePath(goModPath string) string {
 		pkgPathFromGoModCache.Unlock()
 	}()
 
-	data, err := ioutil.ReadFile(goModPath)
+	data, err := os.ReadFile(goModPath)
 	if err != nil {
 		return ""
 	}