all: use testing.T.TempDir

Bit of Friday cleanup.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>

ipn/ipnserver/server_test.go

@@ -7,8 +7,6 @@ package ipnserver_test
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
-	"os"
 	"path/filepath"
 	"strings"
 	"testing"
@@ -25,11 +23,7 @@ func TestRunMultipleAccepts(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	td, err := ioutil.TempDir("", "TestRunMultipleAccepts")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(td)
+	td := t.TempDir()
 	socketPath := filepath.Join(td, "tailscale.sock")
 
 	logf := func(format string, args ...interface{}) {

logtail/filch/filch_test.go

@@ -8,7 +8,6 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
-	"path/filepath"
 	"strings"
 	"testing"
 	"unicode"
@@ -56,19 +55,8 @@ func (f *filchTest) close(t *testing.T) {
 	}
 }
 
-func genFilePrefix(t *testing.T) (dir, prefix string) {
-	t.Helper()
-	dir, err := ioutil.TempDir("", "filch")
-	if err != nil {
-		t.Fatal(err)
-	}
-	return dir, filepath.Join(dir, "ringbuffer-")
-}
-
 func TestQueue(t *testing.T) {
-	td, filePrefix := genFilePrefix(t)
-	defer os.RemoveAll(td)
-
+	filePrefix := t.TempDir()
 	f := newFilchTest(t, filePrefix, Options{ReplaceStderr: false})
 
 	f.readEOF(t)
@@ -90,8 +78,7 @@ func TestQueue(t *testing.T) {
 
 func TestRecover(t *testing.T) {
 	t.Run("empty", func(t *testing.T) {
-		td, filePrefix := genFilePrefix(t)
-		defer os.RemoveAll(td)
+		filePrefix := t.TempDir()
 		f := newFilchTest(t, filePrefix, Options{ReplaceStderr: false})
 		f.write(t, "hello")
 		f.read(t, "hello")
@@ -104,8 +91,7 @@ func TestRecover(t *testing.T) {
 	})
 
 	t.Run("cur", func(t *testing.T) {
-		td, filePrefix := genFilePrefix(t)
-		defer os.RemoveAll(td)
+		filePrefix := t.TempDir()
 		f := newFilchTest(t, filePrefix, Options{ReplaceStderr: false})
 		f.write(t, "hello")
 		f.close(t)
@@ -123,8 +109,7 @@ func TestRecover(t *testing.T) {
 		filch_test.go:129: r.ReadLine()="hello", want "world"
 		*/
 
-		td, filePrefix := genFilePrefix(t)
-		defer os.RemoveAll(td)
+		filePrefix := t.TempDir()
 		f := newFilchTest(t, filePrefix, Options{ReplaceStderr: false})
 		f.write(t, "hello")
 		f.read(t, "hello")
@@ -155,8 +140,7 @@ func TestFilchStderr(t *testing.T) {
 		stderrFD = 2
 	}()
 
-	td, filePrefix := genFilePrefix(t)
-	defer os.RemoveAll(td)
+	filePrefix := t.TempDir()
 	f := newFilchTest(t, filePrefix, Options{ReplaceStderr: true})
 	f.write(t, "hello")
 	if _, err := fmt.Fprintf(pipeW, "filch\n"); err != nil {

tempfork/osexec/lp_unix_test.go

@@ -7,17 +7,12 @@
 package exec
 
 import (
-	"io/ioutil"
 	"os"
 	"testing"
 )
 
 func TestLookPathUnixEmptyPath(t *testing.T) {
-	tmp, err := ioutil.TempDir("", "TestLookPathUnixEmptyPath")
-	if err != nil {
-		t.Fatal("TempDir failed: ", err)
-	}
-	defer os.RemoveAll(tmp)
+	tmp := t.TempDir()
 	wd, err := os.Getwd()
 	if err != nil {
 		t.Fatal("Getwd failed: ", err)