runtime: replace os.MkdirTemp with T.TempDir

Updates #45402

Change-Id: I3aa82fc2486b4de49b45388bbab24f5ffe558f91
Reviewed-on: https://go-review.googlesource.com/c/go/+/307989
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Tobias Klauser <tobias.klauser@gmail.com>

src/runtime/crash_unix_test.go

@@ -85,11 +85,7 @@ func TestCrashDumpsAllThreads(t *testing.T) {
 
 	t.Parallel()
 
-	dir, err := os.MkdirTemp("", "go-build")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatalf("failed to create temp directory: %v", err)
-	}
-	defer os.RemoveAll(dir)
 
 	if err := os.WriteFile(filepath.Join(dir, "main.go"), []byte(crashDumpsAllThreadsSource), 0666); err != nil {
 		t.Fatalf("failed to create Go file: %v", err)

src/runtime/race/output_test.go

@@ -20,11 +20,7 @@ import (
 )
 
 func TestOutput(t *testing.T) {
-	pkgdir, err := os.MkdirTemp("", "go-build-race-output")
+	pkgdir := t.TempDir()
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(pkgdir)
 	out, err := exec.Command(testenv.GoToolPath(t), "install", "-race", "-pkgdir="+pkgdir, "testing").CombinedOutput()
 	if err != nil {
 		t.Fatalf("go install -race: %v\n%s", err, out)
@@ -35,11 +31,7 @@ func TestOutput(t *testing.T) {
 			t.Logf("test %v runs only on %v, skipping: ", test.name, test.goos)
 			continue
 		}
-		dir, err := os.MkdirTemp("", "go-build")
+		dir := t.TempDir()
-		if err != nil {
-			t.Fatalf("failed to create temp directory: %v", err)
-		}
-		defer os.RemoveAll(dir)
 		source := "main.go"
 		if test.run == "test" {
 			source = "main_test.go"

src/runtime/race/testdata/io_test.go

@@ -17,7 +17,7 @@ import (
 
 func TestNoRaceIOFile(t *testing.T) {
 	x := 0
-	path, _ := os.MkdirTemp("", "race_test")
+	path := t.TempDir()
 	fname := filepath.Join(path, "data")
 	go func() {
 		x = 42

src/runtime/runtime-gdb_test.go

@@ -169,11 +169,7 @@ func testGdbPython(t *testing.T, cgo bool) {
 	checkGdbVersion(t)
 	checkGdbPython(t)
 
-	dir, err := os.MkdirTemp("", "go-build")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatalf("failed to create temp directory: %v", err)
-	}
-	defer os.RemoveAll(dir)
 
 	var buf bytes.Buffer
 	buf.WriteString("package main\n")
@@ -194,7 +190,7 @@ func testGdbPython(t *testing.T, cgo bool) {
 		}
 	}
 
-	err = os.WriteFile(filepath.Join(dir, "main.go"), src, 0644)
+	err := os.WriteFile(filepath.Join(dir, "main.go"), src, 0644)
 	if err != nil {
 		t.Fatalf("failed to create file: %v", err)
 	}
@@ -403,15 +399,11 @@ func TestGdbBacktrace(t *testing.T) {
 	t.Parallel()
 	checkGdbVersion(t)
 
-	dir, err := os.MkdirTemp("", "go-build")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatalf("failed to create temp directory: %v", err)
-	}
-	defer os.RemoveAll(dir)
 
 	// Build the source code.
 	src := filepath.Join(dir, "main.go")
-	err = os.WriteFile(src, []byte(backtraceSource), 0644)
+	err := os.WriteFile(src, []byte(backtraceSource), 0644)
 	if err != nil {
 		t.Fatalf("failed to create file: %v", err)
 	}
@@ -481,15 +473,11 @@ func TestGdbAutotmpTypes(t *testing.T) {
 		t.Skip("TestGdbAutotmpTypes is too slow on aix/ppc64")
 	}
 
-	dir, err := os.MkdirTemp("", "go-build")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatalf("failed to create temp directory: %v", err)
-	}
-	defer os.RemoveAll(dir)
 
 	// Build the source code.
 	src := filepath.Join(dir, "main.go")
-	err = os.WriteFile(src, []byte(autotmpTypeSource), 0644)
+	err := os.WriteFile(src, []byte(autotmpTypeSource), 0644)
 	if err != nil {
 		t.Fatalf("failed to create file: %v", err)
 	}
@@ -550,15 +538,11 @@ func TestGdbConst(t *testing.T) {
 	t.Parallel()
 	checkGdbVersion(t)
 
-	dir, err := os.MkdirTemp("", "go-build")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatalf("failed to create temp directory: %v", err)
-	}
-	defer os.RemoveAll(dir)
 
 	// Build the source code.
 	src := filepath.Join(dir, "main.go")
-	err = os.WriteFile(src, []byte(constsSource), 0644)
+	err := os.WriteFile(src, []byte(constsSource), 0644)
 	if err != nil {
 		t.Fatalf("failed to create file: %v", err)
 	}
@@ -617,15 +601,11 @@ func TestGdbPanic(t *testing.T) {
 	t.Parallel()
 	checkGdbVersion(t)
 
-	dir, err := os.MkdirTemp("", "go-build")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatalf("failed to create temp directory: %v", err)
-	}
-	defer os.RemoveAll(dir)
 
 	// Build the source code.
 	src := filepath.Join(dir, "main.go")
-	err = os.WriteFile(src, []byte(panicSource), 0644)
+	err := os.WriteFile(src, []byte(panicSource), 0644)
 	if err != nil {
 		t.Fatalf("failed to create file: %v", err)
 	}
@@ -695,15 +675,11 @@ func TestGdbInfCallstack(t *testing.T) {
 	t.Parallel()
 	checkGdbVersion(t)
 
-	dir, err := os.MkdirTemp("", "go-build")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatalf("failed to create temp directory: %v", err)
-	}
-	defer os.RemoveAll(dir)
 
 	// Build the source code.
 	src := filepath.Join(dir, "main.go")
-	err = os.WriteFile(src, []byte(InfCallstackSource), 0644)
+	err := os.WriteFile(src, []byte(InfCallstackSource), 0644)
 	if err != nil {
 		t.Fatalf("failed to create file: %v", err)
 	}

src/runtime/runtime-lldb_test.go

@@ -142,14 +142,10 @@ func TestLldbPython(t *testing.T) {
 
 	checkLldbPython(t)
 
-	dir, err := os.MkdirTemp("", "go-build")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatalf("failed to create temp directory: %v", err)
-	}
-	defer os.RemoveAll(dir)
 
 	src := filepath.Join(dir, "main.go")
-	err = os.WriteFile(src, []byte(lldbHelloSource), 0644)
+	err := os.WriteFile(src, []byte(lldbHelloSource), 0644)
 	if err != nil {
 		t.Fatalf("failed to create src file: %v", err)
 	}

src/runtime/signal_windows_test.go

@@ -8,7 +8,6 @@ import (
 	"bytes"
 	"fmt"
 	"internal/testenv"
-	"os"
 	"os/exec"
 	"path/filepath"
 	"runtime"
@@ -29,11 +28,7 @@ func TestVectoredHandlerDontCrashOnLibrary(t *testing.T) {
 	testenv.MustHaveExecPath(t, "gcc")
 	testprog.Lock()
 	defer testprog.Unlock()
-	dir, err := os.MkdirTemp("", "go-build")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatalf("failed to create temp directory: %v", err)
-	}
-	defer os.RemoveAll(dir)
 
 	// build go dll
 	dll := filepath.Join(dir, "testwinlib.dll")
@@ -157,11 +152,7 @@ func TestLibraryCtrlHandler(t *testing.T) {
 	testenv.MustHaveExecPath(t, "gcc")
 	testprog.Lock()
 	defer testprog.Unlock()
-	dir, err := os.MkdirTemp("", "go-build")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatalf("failed to create temp directory: %v", err)
-	}
-	defer os.RemoveAll(dir)
 
 	// build go dll
 	dll := filepath.Join(dir, "dummy.dll")

src/runtime/syscall_windows_test.go

@@ -543,11 +543,7 @@ func TestStdcallAndCDeclCallbacks(t *testing.T) {
 	if _, err := exec.LookPath("gcc"); err != nil {
 		t.Skip("skipping test: gcc is missing")
 	}
-	tmp, err := os.MkdirTemp("", "TestCDeclCallback")
+	tmp := t.TempDir()
-	if err != nil {
-		t.Fatal("TempDir failed: ", err)
-	}
-	defer os.RemoveAll(tmp)
 
 	oldRegs := runtime.SetIntArgRegs(abi.IntArgRegs)
 	defer runtime.SetIntArgRegs(oldRegs)
@@ -702,14 +698,10 @@ uintptr_t cfunc(callback f, uintptr_t n) {
    return r;
 }
 `
-	tmpdir, err := os.MkdirTemp("", "TestReturnAfterStackGrowInCallback")
+	tmpdir := t.TempDir()
-	if err != nil {
-		t.Fatal("TempDir failed: ", err)
-	}
-	defer os.RemoveAll(tmpdir)
 
 	srcname := "mydll.c"
-	err = os.WriteFile(filepath.Join(tmpdir, srcname), []byte(src), 0)
+	err := os.WriteFile(filepath.Join(tmpdir, srcname), []byte(src), 0)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -771,14 +763,10 @@ uintptr_t cfunc(uintptr_t a, double b, float c, double d) {
 	return 0;
 }
 `
-	tmpdir, err := os.MkdirTemp("", "TestFloatArgs")
+	tmpdir := t.TempDir()
-	if err != nil {
-		t.Fatal("TempDir failed: ", err)
-	}
-	defer os.RemoveAll(tmpdir)
 
 	srcname := "mydll.c"
-	err = os.WriteFile(filepath.Join(tmpdir, srcname), []byte(src), 0)
+	err := os.WriteFile(filepath.Join(tmpdir, srcname), []byte(src), 0)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -833,14 +821,10 @@ double cfuncDouble(uintptr_t a, double b, float c, double d) {
 	return 0;
 }
 `
-	tmpdir, err := os.MkdirTemp("", "TestFloatReturn")
+	tmpdir := t.TempDir()
-	if err != nil {
-		t.Fatal("TempDir failed: ", err)
-	}
-	defer os.RemoveAll(tmpdir)
 
 	srcname := "mydll.c"
-	err = os.WriteFile(filepath.Join(tmpdir, srcname), []byte(src), 0)
+	err := os.WriteFile(filepath.Join(tmpdir, srcname), []byte(src), 0)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -1048,16 +1032,7 @@ func TestDLLPreloadMitigation(t *testing.T) {
 		t.Skip("skipping test: gcc is missing")
 	}
 
-	tmpdir, err := os.MkdirTemp("", "TestDLLPreloadMitigation")
+	tmpdir := t.TempDir()
-	if err != nil {
-		t.Fatal("TempDir failed: ", err)
-	}
-	defer func() {
-		err := os.RemoveAll(tmpdir)
-		if err != nil {
-			t.Error(err)
-		}
-	}()
 
 	dir0, err := os.Getwd()
 	if err != nil {
@@ -1135,11 +1110,7 @@ func TestBigStackCallbackSyscall(t *testing.T) {
 		t.Fatal("Abs failed: ", err)
 	}
 
-	tmpdir, err := os.MkdirTemp("", "TestBigStackCallback")
+	tmpdir := t.TempDir()
-	if err != nil {
-		t.Fatal("TempDir failed: ", err)
-	}
-	defer os.RemoveAll(tmpdir)
 
 	outname := "mydll.dll"
 	cmd := exec.Command("gcc", "-shared", "-s", "-Werror", "-o", outname, srcname)
@@ -1284,14 +1255,10 @@ func BenchmarkOsYield(b *testing.B) {
 }
 
 func BenchmarkRunningGoProgram(b *testing.B) {
-	tmpdir, err := os.MkdirTemp("", "BenchmarkRunningGoProgram")
+	tmpdir := b.TempDir()
-	if err != nil {
-		b.Fatal(err)
-	}
-	defer os.RemoveAll(tmpdir)
 
 	src := filepath.Join(tmpdir, "main.go")
-	err = os.WriteFile(src, []byte(benchmarkRunningGoProgram), 0666)
+	err := os.WriteFile(src, []byte(benchmarkRunningGoProgram), 0666)
 	if err != nil {
 		b.Fatal(err)
 	}