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>

3 files changed, 10 insertions, 12 deletions

diff --git a/src/debug/dwarf/dwarf5ranges_test.go b/src/debug/dwarf/dwarf5ranges_test.go
index 2229d439a5..0ff1a55bc9 100644
--- a/src/debug/dwarf/dwarf5ranges_test.go
+++ b/src/debug/dwarf/dwarf5ranges_test.go
@@ -6,13 +6,13 @@ package dwarf
 
 import (
 	"encoding/binary"
-	"io/ioutil"
+	"os"
 	"reflect"
 	"testing"
 )
 
 func TestDwarf5Ranges(t *testing.T) {
-	rngLists, err := ioutil.ReadFile("testdata/debug_rnglists")
+	rngLists, err := os.ReadFile("testdata/debug_rnglists")
 	if err != nil {
 		t.Fatalf("could not read test data: %v", err)
 	}
diff --git a/src/debug/gosym/pclntab_test.go b/src/debug/gosym/pclntab_test.go
index f93a5bf5e5..7347139b5d 100644
--- a/src/debug/gosym/pclntab_test.go
+++ b/src/debug/gosym/pclntab_test.go
@@ -10,7 +10,6 @@ import (
 	"debug/elf"
 	"internal/testenv"
 	"io"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -31,7 +30,7 @@ func dotest(t *testing.T) {
 		t.Skipf("skipping on non-AMD64 system %s", runtime.GOARCH)
 	}
 	var err error
-	pclineTempDir, err = ioutil.TempDir("", "pclinetest")
+	pclineTempDir, err = os.MkdirTemp("", "pclinetest")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -278,7 +277,7 @@ func TestPCLine(t *testing.T) {
 // }
 // [END]
 func Test115PclnParsing(t *testing.T) {
-	zippedDat, err := ioutil.ReadFile("testdata/pcln115.gz")
+	zippedDat, err := os.ReadFile("testdata/pcln115.gz")
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/src/debug/pe/file_test.go b/src/debug/pe/file_test.go
index d96cd30904..58deff1450 100644
--- a/src/debug/pe/file_test.go
+++ b/src/debug/pe/file_test.go
@@ -8,7 +8,6 @@ import (
 	"bytes"
 	"debug/dwarf"
 	"internal/testenv"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -354,7 +353,7 @@ func testDWARF(t *testing.T, linktype int) {
 	}
 	testenv.MustHaveGoRun(t)
 
-	tmpdir, err := ioutil.TempDir("", "TestDWARF")
+	tmpdir, err := os.MkdirTemp("", "TestDWARF")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -473,7 +472,7 @@ func TestBSSHasZeros(t *testing.T) {
 		t.Skip("skipping test: gcc is missing")
 	}
 
-	tmpdir, err := ioutil.TempDir("", "TestBSSHasZeros")
+	tmpdir, err := os.MkdirTemp("", "TestBSSHasZeros")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -492,7 +491,7 @@ main(void)
 	return 0;
 }
 `
-	err = ioutil.WriteFile(srcpath, []byte(src), 0644)
+	err = os.WriteFile(srcpath, []byte(src), 0644)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -597,14 +596,14 @@ func TestBuildingWindowsGUI(t *testing.T) {
 	if runtime.GOOS != "windows" {
 		t.Skip("skipping windows only test")
 	}
-	tmpdir, err := ioutil.TempDir("", "TestBuildingWindowsGUI")
+	tmpdir, err := os.MkdirTemp("", "TestBuildingWindowsGUI")
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer os.RemoveAll(tmpdir)
 
 	src := filepath.Join(tmpdir, "a.go")
-	err = ioutil.WriteFile(src, []byte(`package main; func main() {}`), 0644)
+	err = os.WriteFile(src, []byte(`package main; func main() {}`), 0644)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -684,7 +683,7 @@ func TestInvalidOptionalHeaderMagic(t *testing.T) {
 func TestImportedSymbolsNoPanicMissingOptionalHeader(t *testing.T) {
 	// https://golang.org/issue/30250
 	// ImportedSymbols shouldn't panic if optional headers is missing
-	data, err := ioutil.ReadFile("testdata/gcc-amd64-mingw-obj")
+	data, err := os.ReadFile("testdata/gcc-amd64-mingw-obj")
 	if err != nil {
 		t.Fatal(err)
 	}