all: update to use os.ReadFile, os.WriteFile, os.CreateTemp, os.MkdirTemp

As part of #42026, these helpers from io/ioutil were moved to os.
(ioutil.TempFile and TempDir became os.CreateTemp and MkdirTemp.)

Update the Go tree to use the preferred names.

As usual, code compiled with the Go 1.4 bootstrap toolchain
and code vendored from other sources is excluded.

ReadDir changes are in a separate CL, because they are not a
simple search and replace.

For #42026.

Change-Id: If318df0216d57e95ea0c4093b89f65e5b0ababb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/266365
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

1 files changed, 6 insertions, 7 deletions

diff --git a/src/cmd/pack/pack_test.go b/src/cmd/pack/pack_test.go
index 9f65705def..218c7acda6 100644
--- a/src/cmd/pack/pack_test.go
+++ b/src/cmd/pack/pack_test.go
@@ -12,7 +12,6 @@ import (
 	"internal/testenv"
 	"io"
 	"io/fs"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -22,7 +21,7 @@ import (
 
 // tmpDir creates a temporary directory and returns its name.
 func tmpDir(t *testing.T) string {
-	name, err := ioutil.TempDir("", "pack")
+	name, err := os.MkdirTemp("", "pack")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -158,7 +157,7 @@ func TestExtract(t *testing.T) {
 	ar = openArchive(name, os.O_RDONLY, []string{goodbyeFile.name})
 	ar.scan(ar.extractContents)
 	ar.a.File().Close()
-	data, err := ioutil.ReadFile(goodbyeFile.name)
+	data, err := os.ReadFile(goodbyeFile.name)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -183,7 +182,7 @@ func TestHello(t *testing.T) {
 			println("hello world")
 		}
 	`
-	err := ioutil.WriteFile(hello, []byte(prog), 0666)
+	err := os.WriteFile(hello, []byte(prog), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -251,7 +250,7 @@ func TestLargeDefs(t *testing.T) {
 			println("ok")
 		}
 	`
-	err = ioutil.WriteFile(main, []byte(prog), 0666)
+	err = os.WriteFile(main, []byte(prog), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -281,13 +280,13 @@ func TestIssue21703(t *testing.T) {
 	defer os.RemoveAll(dir)
 
 	const aSrc = `package a; const X = "\n!\n"`
-	err := ioutil.WriteFile(filepath.Join(dir, "a.go"), []byte(aSrc), 0666)
+	err := os.WriteFile(filepath.Join(dir, "a.go"), []byte(aSrc), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
 
 	const bSrc = `package b; import _ "a"`
-	err = ioutil.WriteFile(filepath.Join(dir, "b.go"), []byte(bSrc), 0666)
+	err = os.WriteFile(filepath.Join(dir, "b.go"), []byte(bSrc), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}