libct/*_test.go: use t.TempDir

Replace ioutil.TempDir (mostly) with t.TempDir, which require no
explicit cleanup.

While at it, fix incorrect usage of os.ModePerm in libcontainer/intelrdt
test. This is supposed to be a mask, not mode bits.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

libcontainer/cgroups/fs2/io_test.go

@@ -2,7 +2,6 @@ package fs2
 
 import (
 	"io/ioutil"
-	"os"
 	"path/filepath"
 	"reflect"
 	"sort"
@@ -60,11 +59,7 @@ func TestStatIo(t *testing.T) {
 	// We're using a fake cgroupfs.
 	cgroups.TestMode = true
 
-	fakeCgroupDir, err := ioutil.TempDir("", "runc-stat-io-test.*")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(fakeCgroupDir)
+	fakeCgroupDir := t.TempDir()
 	statPath := filepath.Join(fakeCgroupDir, "io.stat")
 
 	if err := ioutil.WriteFile(statPath, []byte(exampleIoStatData), 0o644); err != nil {

libcontainer/cgroups/fscommon/utils_test.go

@@ -25,16 +25,11 @@ func init() {
 
 func TestGetCgroupParamsInt(t *testing.T) {
 	// Setup tempdir.
-	tempDir, err := ioutil.TempDir("", "cgroup_utils_test")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(tempDir)
+	tempDir := t.TempDir()
 	tempFile := filepath.Join(tempDir, cgroupFile)
 
 	// Success.
-	err = ioutil.WriteFile(tempFile, []byte(floatString), 0o755)
-	if err != nil {
+	if err := ioutil.WriteFile(tempFile, []byte(floatString), 0o755); err != nil {
 		t.Fatal(err)
 	}
 	value, err := GetCgroupParamUint(tempDir, cgroupFile)

libcontainer/configs/validate/validator_test.go

@@ -1,7 +1,6 @@
 package validate_test
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -264,13 +263,7 @@ func TestValidateSysctlWithBindHostNetNS(t *testing.T) {
 
 	const selfnet = "/proc/self/ns/net"
 
-	dir, err := ioutil.TempDir("", t.Name()+"-*")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.Remove(dir)
-
-	file := filepath.Join(dir, "default")
+	file := filepath.Join(t.TempDir(), "default")
 	fd, err := os.Create(file)
 	if err != nil {
 		t.Fatal(err)

libcontainer/container_linux_test.go

@@ -4,7 +4,6 @@ package libcontainer
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"testing"
 
@@ -339,14 +338,8 @@ func TestGetContainerStateAfterUpdate(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	rootDir, err := ioutil.TempDir("", "TestGetContainerStateAfterUpdate")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(rootDir)
-
 	container := &linuxContainer{
-		root: rootDir,
+		root: t.TempDir(),
 		id:   "myid",
 		config: &configs.Config{
 			Namespaces: []configs.Namespace{

libcontainer/factory_linux_test.go

@@ -4,7 +4,6 @@ package libcontainer
 
 import (
 	"errors"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"reflect"
@@ -18,20 +17,8 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-func newTestRoot() (string, error) {
-	dir, err := ioutil.TempDir("", "libcontainer")
-	if err != nil {
-		return "", err
-	}
-	return dir, nil
-}
-
 func TestFactoryNew(t *testing.T) {
-	root, rerr := newTestRoot()
-	if rerr != nil {
-		t.Fatal(rerr)
-	}
-	defer os.RemoveAll(root)
+	root := t.TempDir()
 	factory, err := New(root, Cgroupfs)
 	if err != nil {
 		t.Fatal(err)
@@ -53,11 +40,7 @@ func TestFactoryNew(t *testing.T) {
 }
 
 func TestFactoryNewIntelRdt(t *testing.T) {
-	root, rerr := newTestRoot()
-	if rerr != nil {
-		t.Fatal(rerr)
-	}
-	defer os.RemoveAll(root)
+	root := t.TempDir()
 	factory, err := New(root, Cgroupfs, IntelRdtFs)
 	if err != nil {
 		t.Fatal(err)
@@ -79,11 +62,7 @@ func TestFactoryNewIntelRdt(t *testing.T) {
 }
 
 func TestFactoryNewTmpfs(t *testing.T) {
-	root, rerr := newTestRoot()
-	if rerr != nil {
-		t.Fatal(rerr)
-	}
-	defer os.RemoveAll(root)
+	root := t.TempDir()
 	factory, err := New(root, Cgroupfs, TmpfsRoot)
 	if err != nil {
 		t.Fatal(err)
@@ -130,12 +109,7 @@ func TestFactoryNewTmpfs(t *testing.T) {
 }
 
 func TestFactoryLoadNotExists(t *testing.T) {
-	root, rerr := newTestRoot()
-	if rerr != nil {
-		t.Fatal(rerr)
-	}
-	defer os.RemoveAll(root) //nolint: errcheck
-	factory, err := New(root, Cgroupfs)
+	factory, err := New(t.TempDir(), Cgroupfs)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -149,11 +123,7 @@ func TestFactoryLoadNotExists(t *testing.T) {
 }
 
 func TestFactoryLoadContainer(t *testing.T) {
-	root, err := newTestRoot()
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(root) //nolint: errcheck
+	root := t.TempDir()
 	// setup default container config and state for mocking
 	var (
 		id            = "1"

libcontainer/intelrdt/cmt_test.go

@@ -1,7 +1,6 @@
 package intelrdt
 
 import (
-	"os"
 	"path/filepath"
 	"testing"
 )
@@ -13,18 +12,7 @@ func TestGetCMTNumaNodeStats(t *testing.T) {
 		"llc_occupancy": 9123911,
 	}
 
-	mockedL3_MON, err := mockResctrlL3_MON(mocksNUMANodesToCreate, mocksFilesToCreate)
-
-	defer func() {
-		err := os.RemoveAll(mockedL3_MON)
-		if err != nil {
-			t.Fatal(err)
-		}
-	}()
-
-	if err != nil {
-		t.Fatal(err)
-	}
+	mockedL3_MON := mockResctrlL3_MON(t, mocksNUMANodesToCreate, mocksFilesToCreate)
 
 	t.Run("Gather mbm", func(t *testing.T) {
 		enabledMonFeatures.llcOccupancy = true

libcontainer/intelrdt/mbm_test.go

@@ -3,7 +3,6 @@
 package intelrdt
 
 import (
-	"os"
 	"path/filepath"
 	"testing"
 )
@@ -16,18 +15,7 @@ func TestGetMBMNumaNodeStats(t *testing.T) {
 		"mbm_local_bytes": 2361361,
 	}
 
-	mockedL3_MON, err := mockResctrlL3_MON(mocksNUMANodesToCreate, mocksFilesToCreate)
-
-	defer func() {
-		err := os.RemoveAll(mockedL3_MON)
-		if err != nil {
-			t.Fatal(err)
-		}
-	}()
-
-	if err != nil {
-		t.Fatal(err)
-	}
+	mockedL3_MON := mockResctrlL3_MON(t, mocksNUMANodesToCreate, mocksFilesToCreate)
 
 	t.Run("Gather mbm", func(t *testing.T) {
 		enabledMonFeatures.mbmTotalBytes = true

libcontainer/intelrdt/monitoring_test.go

@@ -38,30 +38,28 @@ func TestParseMonFeatures(t *testing.T) {
 	})
 }
 
-func mockResctrlL3_MON(NUMANodes []string, mocks map[string]uint64) (string, error) {
-	testDir, err := ioutil.TempDir("", "rdt_mbm_test")
-	if err != nil {
-		return "", err
-	}
+func mockResctrlL3_MON(t *testing.T, NUMANodes []string, mocks map[string]uint64) string {
+	t.Helper()
+	testDir := t.TempDir()
 	monDataPath := filepath.Join(testDir, "mon_data")
 
 	for _, numa := range NUMANodes {
 		numaPath := filepath.Join(monDataPath, numa)
-		err = os.MkdirAll(numaPath, os.ModePerm)
+		err := os.MkdirAll(numaPath, 0o700)
 		if err != nil {
-			return "", err
+			t.Fatal(err)
 		}
 
 		for fileName, value := range mocks {
 			err := ioutil.WriteFile(filepath.Join(numaPath, fileName), []byte(strconv.FormatUint(value, 10)), 0o644)
 			if err != nil {
-				return "", err
+				t.Fatal(err)
 			}
 		}
 
 	}
 
-	return testDir, nil
+	return testDir
 }
 
 func TestGetMonitoringStats(t *testing.T) {
@@ -79,18 +77,7 @@ func TestGetMonitoringStats(t *testing.T) {
 		"llc_occupancy":   123331,
 	}
 
-	mockedL3_MON, err := mockResctrlL3_MON(mocksNUMANodesToCreate, mocksFilesToCreate)
-
-	defer func() {
-		err := os.RemoveAll(mockedL3_MON)
-		if err != nil {
-			t.Fatal(err)
-		}
-	}()
-
-	if err != nil {
-		t.Fatal(err)
-	}
+	mockedL3_MON := mockResctrlL3_MON(t, mocksNUMANodesToCreate, mocksFilesToCreate)
 
 	t.Run("Gather monitoring stats", func(t *testing.T) {
 		var stats Stats

libcontainer/notify_linux_test.go

@@ -17,10 +17,7 @@ import (
 type notifyFunc func(path string) (<-chan struct{}, error)
 
 func testMemoryNotification(t *testing.T, evName string, notify notifyFunc, targ string) {
-	memoryPath, err := ioutil.TempDir("", "testmemnotification-"+evName)
-	if err != nil {
-		t.Fatal(err)
-	}
+	memoryPath := t.TempDir()
 	evFile := filepath.Join(memoryPath, evName)
 	eventPath := filepath.Join(memoryPath, "cgroup.event_control")
 	if err := ioutil.WriteFile(evFile, []byte{}, 0o700); err != nil {