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 <[email protected]>
Run-TryBot: Russ Cox <[email protected]>
TryBot-Result: Go Bot <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>

Author: rsc

src/archive/tar/reader_test.go

@@ -10,7 +10,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"math"
 	"os"
 	"path"
@@ -773,7 +772,7 @@ func TestReadTruncation(t *testing.T) {
 		"testdata/pax-path-hdr.tar",
 		"testdata/sparse-formats.tar",
 	} {
-		buf, err := ioutil.ReadFile(p)
+		buf, err := os.ReadFile(p)
 		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}

src/archive/tar/tar_test.go

@@ -11,7 +11,6 @@ import (
 	"internal/testenv"
 	"io"
 	"io/fs"
-	"io/ioutil"
 	"math"
 	"os"
 	"path"
@@ -263,7 +262,7 @@ func TestFileInfoHeaderDir(t *testing.T) {
 func TestFileInfoHeaderSymlink(t *testing.T) {
 	testenv.MustHaveSymlink(t)
 
-	tmpdir, err := ioutil.TempDir("", "TestFileInfoHeaderSymlink")
+	tmpdir, err := os.MkdirTemp("", "TestFileInfoHeaderSymlink")
 	if err != nil {
 		t.Fatal(err)
 	}

src/archive/tar/writer_test.go

@@ -9,7 +9,6 @@ import (
 	"encoding/hex"
 	"errors"
 	"io"
-	"io/ioutil"
 	"os"
 	"path"
 	"reflect"
@@ -520,7 +519,7 @@ func TestWriter(t *testing.T) {
 			}
 
 			if v.file != "" {
-				want, err := ioutil.ReadFile(v.file)
+				want, err := os.ReadFile(v.file)
 				if err != nil {
 					t.Fatalf("ReadFile() = %v, want nil", err)
 				}

src/archive/zip/reader_test.go

@@ -11,7 +11,6 @@ import (
 	"internal/obscuretestdata"
 	"io"
 	"io/fs"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -629,7 +628,7 @@ func readTestFile(t *testing.T, zt ZipTest, ft ZipTestFile, f *File) {
 	var c []byte
 	if ft.Content != nil {
 		c = ft.Content
-	} else if c, err = ioutil.ReadFile("testdata/" + ft.File); err != nil {
+	} else if c, err = os.ReadFile("testdata/" + ft.File); err != nil {
 		t.Error(err)
 		return
 	}
@@ -685,7 +684,7 @@ func TestInvalidFiles(t *testing.T) {
 }
 
 func messWith(fileName string, corrupter func(b []byte)) (r io.ReaderAt, size int64) {
-	data, err := ioutil.ReadFile(filepath.Join("testdata", fileName))
+	data, err := os.ReadFile(filepath.Join("testdata", fileName))
 	if err != nil {
 		panic("Error reading " + fileName + ": " + err.Error())
 	}
@@ -792,17 +791,17 @@ func returnRecursiveZip() (r io.ReaderAt, size int64) {
 //
 //	func main() {
 //		bigZip := makeZip("big.file", io.LimitReader(zeros{}, 1<<32-1))
-//		if err := ioutil.WriteFile("/tmp/big.zip", bigZip, 0666); err != nil {
+//		if err := os.WriteFile("/tmp/big.zip", bigZip, 0666); err != nil {
 //			log.Fatal(err)
 //		}
 //
 //		biggerZip := makeZip("big.zip", bytes.NewReader(bigZip))
-//		if err := ioutil.WriteFile("/tmp/bigger.zip", biggerZip, 0666); err != nil {
+//		if err := os.WriteFile("/tmp/bigger.zip", biggerZip, 0666); err != nil {
 //			log.Fatal(err)
 //		}
 //
 //		biggestZip := makeZip("bigger.zip", bytes.NewReader(biggerZip))
-//		if err := ioutil.WriteFile("/tmp/biggest.zip", biggestZip, 0666); err != nil {
+//		if err := os.WriteFile("/tmp/biggest.zip", biggestZip, 0666); err != nil {
 //			log.Fatal(err)
 //		}
 //	}

src/archive/zip/writer_test.go

@@ -10,8 +10,8 @@ import (
 	"fmt"
 	"io"
 	"io/fs"
-	"io/ioutil"
 	"math/rand"
+	"os"
 	"strings"
 	"testing"
 	"time"
@@ -237,7 +237,7 @@ func TestWriterTime(t *testing.T) {
 		t.Fatalf("unexpected Close error: %v", err)
 	}
 
-	want, err := ioutil.ReadFile("testdata/time-go.zip")
+	want, err := os.ReadFile("testdata/time-go.zip")
 	if err != nil {
 		t.Fatalf("unexpected ReadFile error: %v", err)
 	}

src/cmd/addr2line/addr2line_test.go

@@ -8,7 +8,6 @@ import (
 	"bufio"
 	"bytes"
 	"internal/testenv"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -98,16 +97,16 @@ func testAddr2Line(t *testing.T, exepath, addr string) {
 	if !os.SameFile(fi1, fi2) {
 		t.Fatalf("addr2line_test.go and %s are not same file", srcPath)
 	}
-	if srcLineNo != "107" {
-		t.Fatalf("line number = %v; want 107", srcLineNo)
+	if srcLineNo != "106" {
+		t.Fatalf("line number = %v; want 106", srcLineNo)
 	}
 }
 
 // This is line 106. The test depends on that.
 func TestAddr2Line(t *testing.T) {
 	testenv.MustHaveGoBuild(t)
 
-	tmpDir, err := ioutil.TempDir("", "TestAddr2Line")
+	tmpDir, err := os.MkdirTemp("", "TestAddr2Line")
 	if err != nil {
 		t.Fatal("TempDir failed: ", err)
 	}

src/cmd/api/goapi.go

@@ -17,7 +17,6 @@ import (
 	"go/token"
 	"go/types"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
@@ -342,7 +341,7 @@ func fileFeatures(filename string) []string {
 	if filename == "" {
 		return nil
 	}
-	bs, err := ioutil.ReadFile(filename)
+	bs, err := os.ReadFile(filename)
 	if err != nil {
 		log.Fatalf("Error reading file %s: %v", filename, err)
 	}

src/cmd/api/goapi_test.go

@@ -9,7 +9,6 @@ import (
 	"flag"
 	"fmt"
 	"go/build"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"sort"
@@ -75,7 +74,7 @@ func TestGolden(t *testing.T) {
 			f.Close()
 		}
 
-		bs, err := ioutil.ReadFile(goldenFile)
+		bs, err := os.ReadFile(goldenFile)
 		if err != nil {
 			t.Fatalf("opening golden.txt for package %q: %v", fi.Name(), err)
 		}

src/cmd/cover/cover.go

@@ -12,7 +12,6 @@ import (
 	"go/parser"
 	"go/token"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"sort"
@@ -304,7 +303,7 @@ func (f *File) Visit(node ast.Node) ast.Visitor {
 
 func annotate(name string) {
 	fset := token.NewFileSet()
-	content, err := ioutil.ReadFile(name)
+	content, err := os.ReadFile(name)
 	if err != nil {
 		log.Fatalf("cover: %s: %s", name, err)
 	}

src/cmd/cover/cover_test.go

@@ -13,7 +13,6 @@ import (
 	"go/parser"
 	"go/token"
 	"internal/testenv"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -81,7 +80,7 @@ var debug = flag.Bool("debug", false, "keep rewritten files for debugging")
 // We use TestMain to set up a temporary directory and remove it when
 // the tests are done.
 func TestMain(m *testing.M) {
-	dir, err := ioutil.TempDir("", "go-testcover")
+	dir, err := os.MkdirTemp("", "go-testcover")
 	if err != nil {
 		fmt.Fprintln(os.Stderr, err)
 		os.Exit(1)
@@ -173,7 +172,7 @@ func TestCover(t *testing.T) {
 	buildCover(t)
 
 	// Read in the test file (testTest) and write it, with LINEs specified, to coverInput.
-	file, err := ioutil.ReadFile(testTest)
+	file, err := os.ReadFile(testTest)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -192,7 +191,7 @@ func TestCover(t *testing.T) {
 		[]byte("}"))
 	lines = append(lines, []byte("func unFormatted2(b bool) {if b{}else{}}"))
 
-	if err := ioutil.WriteFile(coverInput, bytes.Join(lines, []byte("\n")), 0666); err != nil {
+	if err := os.WriteFile(coverInput, bytes.Join(lines, []byte("\n")), 0666); err != nil {
 		t.Fatal(err)
 	}
 
@@ -208,19 +207,19 @@ func TestCover(t *testing.T) {
 
 	// Copy testmain to testTempDir, so that it is in the same directory
 	// as coverOutput.
-	b, err := ioutil.ReadFile(testMain)
+	b, err := os.ReadFile(testMain)
 	if err != nil {
 		t.Fatal(err)
 	}
-	if err := ioutil.WriteFile(tmpTestMain, b, 0444); err != nil {
+	if err := os.WriteFile(tmpTestMain, b, 0444); err != nil {
 		t.Fatal(err)
 	}
 
 	// go run ./testdata/main.go ./testdata/test.go
 	cmd = exec.Command(testenv.GoToolPath(t), "run", tmpTestMain, coverOutput)
 	run(cmd, t)
 
-	file, err = ioutil.ReadFile(coverOutput)
+	file, err = os.ReadFile(coverOutput)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -251,7 +250,7 @@ func TestDirectives(t *testing.T) {
 	// Read the source file and find all the directives. We'll keep
 	// track of whether each one has been seen in the output.
 	testDirectives := filepath.Join(testdata, "directives.go")
-	source, err := ioutil.ReadFile(testDirectives)
+	source, err := os.ReadFile(testDirectives)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -398,7 +397,7 @@ func TestCoverHTML(t *testing.T) {
 
 	// Extract the parts of the HTML with comment markers,
 	// and compare against a golden file.
-	entireHTML, err := ioutil.ReadFile(htmlHTML)
+	entireHTML, err := os.ReadFile(htmlHTML)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -420,7 +419,7 @@ func TestCoverHTML(t *testing.T) {
 	if scan.Err() != nil {
 		t.Error(scan.Err())
 	}
-	golden, err := ioutil.ReadFile(htmlGolden)
+	golden, err := os.ReadFile(htmlGolden)
 	if err != nil {
 		t.Fatalf("reading golden file: %v", err)
 	}
@@ -457,7 +456,7 @@ func TestHtmlUnformatted(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	if err := ioutil.WriteFile(filepath.Join(htmlUDir, "go.mod"), []byte("module htmlunformatted\n"), 0666); err != nil {
+	if err := os.WriteFile(filepath.Join(htmlUDir, "go.mod"), []byte("module htmlunformatted\n"), 0666); err != nil {
 		t.Fatal(err)
 	}
 
@@ -474,10 +473,10 @@ lab:
 
 	const htmlUTestContents = `package htmlunformatted`
 
-	if err := ioutil.WriteFile(htmlU, []byte(htmlUContents), 0444); err != nil {
+	if err := os.WriteFile(htmlU, []byte(htmlUContents), 0444); err != nil {
 		t.Fatal(err)
 	}
-	if err := ioutil.WriteFile(htmlUTest, []byte(htmlUTestContents), 0444); err != nil {
+	if err := os.WriteFile(htmlUTest, []byte(htmlUTestContents), 0444); err != nil {
 		t.Fatal(err)
 	}
 
@@ -540,13 +539,13 @@ func TestFuncWithDuplicateLines(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	if err := ioutil.WriteFile(filepath.Join(lineDupDir, "go.mod"), []byte("module linedup\n"), 0666); err != nil {
+	if err := os.WriteFile(filepath.Join(lineDupDir, "go.mod"), []byte("module linedup\n"), 0666); err != nil {
 		t.Fatal(err)
 	}
-	if err := ioutil.WriteFile(lineDupGo, []byte(lineDupContents), 0444); err != nil {
+	if err := os.WriteFile(lineDupGo, []byte(lineDupContents), 0444); err != nil {
 		t.Fatal(err)
 	}
-	if err := ioutil.WriteFile(lineDupTestGo, []byte(lineDupTestContents), 0444); err != nil {
+	if err := os.WriteFile(lineDupTestGo, []byte(lineDupTestContents), 0444); err != nil {
 		t.Fatal(err)
 	}
 

src/cmd/cover/html.go

@@ -11,7 +11,6 @@ import (
 	"fmt"
 	"html/template"
 	"io"
-	"io/ioutil"
 	"math"
 	"os"
 	"path/filepath"
@@ -43,7 +42,7 @@ func htmlOutput(profile, outfile string) error {
 		if err != nil {
 			return err
 		}
-		src, err := ioutil.ReadFile(file)
+		src, err := os.ReadFile(file)
 		if err != nil {
 			return fmt.Errorf("can't read %q: %v", fn, err)
 		}
@@ -62,7 +61,7 @@ func htmlOutput(profile, outfile string) error {
 	var out *os.File
 	if outfile == "" {
 		var dir string
-		dir, err = ioutil.TempDir("", "cover")
+		dir, err = os.MkdirTemp("", "cover")
 		if err != nil {
 			return err
 		}

src/cmd/fix/main.go

@@ -15,7 +15,6 @@ import (
 	"go/token"
 	"io"
 	"io/fs"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"sort"
@@ -217,7 +216,7 @@ func processFile(filename string, useStdin bool) error {
 		return nil
 	}
 
-	return ioutil.WriteFile(f.Name(), newSrc, 0)
+	return os.WriteFile(f.Name(), newSrc, 0)
 }
 
 func gofmt(n interface{}) string {

src/cmd/fix/typecheck.go

@@ -9,7 +9,6 @@ import (
 	"go/ast"
 	"go/parser"
 	"go/token"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -162,12 +161,12 @@ func typecheck(cfg *TypeConfig, f *ast.File) (typeof map[interface{}]string, ass
 			if err != nil {
 				return err
 			}
-			dir, err := ioutil.TempDir(os.TempDir(), "fix_cgo_typecheck")
+			dir, err := os.MkdirTemp(os.TempDir(), "fix_cgo_typecheck")
 			if err != nil {
 				return err
 			}
 			defer os.RemoveAll(dir)
-			err = ioutil.WriteFile(filepath.Join(dir, "in.go"), txt, 0600)
+			err = os.WriteFile(filepath.Join(dir, "in.go"), txt, 0600)
 			if err != nil {
 				return err
 			}
@@ -176,7 +175,7 @@ func typecheck(cfg *TypeConfig, f *ast.File) (typeof map[interface{}]string, ass
 			if err != nil {
 				return err
 			}
-			out, err := ioutil.ReadFile(filepath.Join(dir, "_cgo_gotypes.go"))
+			out, err := os.ReadFile(filepath.Join(dir, "_cgo_gotypes.go"))
 			if err != nil {
 				return err
 			}