test: use T.TempDir to create temporary test directory

This commit replaces `ioutil.TempDir` with `t.TempDir` in tests. The
directory created by `t.TempDir` is automatically removed when the test
and all its subtests complete.

Prior to this commit, temporary directory created using `ioutil.TempDir`
needs to be removed manually by calling `os.RemoveAll`, which is omitted
in some tests. The error handling boilerplate e.g.
	defer func() {
		if err := os.RemoveAll(dir); err != nil {
			t.Fatal(err)
		}
	}
is also tedious, but `t.TempDir` handles this for us nicely.

Reference: https://pkg.go.dev/testing#T.TempDir
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

libpod/container_internal_linux_test.go

@@ -4,8 +4,6 @@
 package libpod
 
 import (
-	"io/ioutil"
-	"os"
 	"testing"
 
 	spec "github.com/opencontainers/runtime-spec/specs-go"
@@ -13,12 +11,6 @@ import (
 )
 
 func TestGenerateUserPasswdEntry(t *testing.T) {
-	dir, err := ioutil.TempDir("", "libpod_test_")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(dir)
-
 	c := Container{
 		config: &ContainerConfig{
 			Spec: &spec.Spec{},

libpod/container_internal_test.go

@@ -19,11 +19,7 @@ var hookPath string
 
 func TestPostDeleteHooks(t *testing.T) {
 	ctx := context.Background()
-	dir, err := ioutil.TempDir("", "libpod_test_")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(dir)
 
 	statePath := filepath.Join(dir, "state")
 	copyPath := filepath.Join(dir, "copy")
@@ -57,7 +53,7 @@ func TestPostDeleteHooks(t *testing.T) {
 			},
 		},
 	}
-	err = c.postDeleteHooks(ctx)
+	err := c.postDeleteHooks(ctx)
 	if err != nil {
 		t.Fatal(err)
 	}

libpod/lock/file/file_lock_test.go

@@ -2,7 +2,6 @@ package file
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -13,11 +12,9 @@ import (
 
 // Test that creating and destroying locks work
 func TestCreateAndDeallocate(t *testing.T) {
-	d, err := ioutil.TempDir("", "filelock")
+	d := t.TempDir()
-	assert.NoError(t, err)
-	defer os.RemoveAll(d)
 
-	_, err = OpenFileLock(filepath.Join(d, "locks"))
+	_, err := OpenFileLock(filepath.Join(d, "locks"))
 	assert.Error(t, err)
 
 	l, err := CreateFileLock(filepath.Join(d, "locks"))
@@ -47,9 +44,7 @@ func TestCreateAndDeallocate(t *testing.T) {
 
 // Test that creating and destroying locks work
 func TestLockAndUnlock(t *testing.T) {
-	d, err := ioutil.TempDir("", "filelock")
+	d := t.TempDir()
-	assert.NoError(t, err)
-	defer os.RemoveAll(d)
 
 	l, err := CreateFileLock(filepath.Join(d, "locks"))
 	assert.NoError(t, err)

pkg/hooks/hooks_test.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"io/ioutil"
-	"os"
 	"path/filepath"
 	"runtime"
 	"testing"
@@ -20,11 +19,7 @@ var path string
 func TestGoodNew(t *testing.T) {
 	ctx := context.Background()
 
-	dir, err := ioutil.TempDir("", "hooks-test-")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(dir)
 
 	for i, name := range []string{
 		"01-my-hook.json",
@@ -36,7 +31,7 @@ func TestGoodNew(t *testing.T) {
 		if i == 0 {
 			extraStages = ", \"poststart\", \"poststop\""
 		}
-		err = ioutil.WriteFile(jsonPath, []byte(fmt.Sprintf("{\"version\": \"1.0.0\", \"hook\": {\"path\": \"%s\", \"timeout\": %d}, \"when\": {\"always\": true}, \"stages\": [\"prestart\"%s]}", path, i+1, extraStages)), 0644)
+		err := ioutil.WriteFile(jsonPath, []byte(fmt.Sprintf("{\"version\": \"1.0.0\", \"hook\": {\"path\": \"%s\", \"timeout\": %d}, \"when\": {\"always\": true}, \"stages\": [\"prestart\"%s]}", path, i+1, extraStages)), 0644)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -92,14 +87,10 @@ func TestGoodNew(t *testing.T) {
 func TestBadNew(t *testing.T) {
 	ctx := context.Background()
 
-	dir, err := ioutil.TempDir("", "hooks-test-")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(dir)
 
 	jsonPath := filepath.Join(dir, "a.json")
-	err = ioutil.WriteFile(jsonPath, []byte("{\"version\": \"-1\"}"), 0644)
+	err := ioutil.WriteFile(jsonPath, []byte("{\"version\": \"-1\"}"), 0644)
 	if err != nil {
 		t.Fatal(err)
 	}

pkg/hooks/monitor_test.go

@@ -15,11 +15,7 @@ import (
 
 func TestMonitorOneDirGood(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
-	dir, err := ioutil.TempDir("", "hooks-test-")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(dir)
 
 	manager, err := New(ctx, []string{dir}, []string{})
 	if err != nil {
@@ -114,17 +110,8 @@ func TestMonitorOneDirGood(t *testing.T) {
 
 func TestMonitorTwoDirGood(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
-	primaryDir, err := ioutil.TempDir("", "hooks-test-primary-")
+	primaryDir := t.TempDir()
-	if err != nil {
+	fallbackDir := t.TempDir()
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(primaryDir)
-
-	fallbackDir, err := ioutil.TempDir("", "hooks-test-fallback-")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(fallbackDir)
 
 	manager, err := New(ctx, []string{fallbackDir, primaryDir}, []string{})
 	if err != nil {

pkg/hooks/read_test.go

@@ -29,14 +29,10 @@ func TestUnknownPath(t *testing.T) {
 }
 
 func TestGoodFile(t *testing.T) {
-	dir, err := ioutil.TempDir("", "hooks-test-")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(dir)
 
 	jsonPath := filepath.Join(dir, "hook.json")
-	err = ioutil.WriteFile(jsonPath, []byte(fmt.Sprintf("{\"version\": \"1.0.0\", \"hook\": {\"path\": \"%s\"}, \"when\": {\"always\": true}, \"stages\": [\"prestart\"]}", path)), 0644)
+	err := ioutil.WriteFile(jsonPath, []byte(fmt.Sprintf("{\"version\": \"1.0.0\", \"hook\": {\"path\": \"%s\"}, \"when\": {\"always\": true}, \"stages\": [\"prestart\"]}", path)), 0644)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -59,14 +55,10 @@ func TestGoodFile(t *testing.T) {
 }
 
 func TestBadFile(t *testing.T) {
-	dir, err := ioutil.TempDir("", "hooks-test-")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(dir)
 
 	path := filepath.Join(dir, "hook.json")
-	err = ioutil.WriteFile(path, []byte("{\"version\": \"1.0.0\", \"hook\": \"not-a-string\"}"), 0644)
+	err := ioutil.WriteFile(path, []byte("{\"version\": \"1.0.0\", \"hook\": \"not-a-string\"}"), 0644)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -121,13 +113,9 @@ func TestInvalidCurrentJSON(t *testing.T) {
 }
 
 func TestGoodDir(t *testing.T) {
-	dir, err := ioutil.TempDir("", "hooks-test-")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(dir)
 
-	err = ioutil.WriteFile(filepath.Join(dir, "README"), []byte("not a hook"), 0644)
+	err := ioutil.WriteFile(filepath.Join(dir, "README"), []byte("not a hook"), 0644)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -172,14 +160,10 @@ func TestUnknownDir(t *testing.T) {
 }
 
 func TestBadDir(t *testing.T) {
-	dir, err := ioutil.TempDir("", "hooks-test-")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(dir)
 
 	jsonPath := filepath.Join(dir, "a.json")
-	err = ioutil.WriteFile(jsonPath, []byte("{\"version\": \"-1\"}"), 0644)
+	err := ioutil.WriteFile(jsonPath, []byte("{\"version\": \"-1\"}"), 0644)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -193,14 +177,10 @@ func TestBadDir(t *testing.T) {
 }
 
 func TestHookExecutableDoesNotExit(t *testing.T) {
-	dir, err := ioutil.TempDir("", "hooks-test-")
+	dir := t.TempDir()
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(dir)
 
 	jsonPath := filepath.Join(dir, "hook.json")
-	err = ioutil.WriteFile(jsonPath, []byte("{\"version\": \"1.0.0\", \"hook\": {\"path\": \"/does/not/exist\"}, \"when\": {\"always\": true}, \"stages\": [\"prestart\"]}"), 0644)
+	err := ioutil.WriteFile(jsonPath, []byte("{\"version\": \"1.0.0\", \"hook\": {\"path\": \"/does/not/exist\"}, \"when\": {\"always\": true}, \"stages\": [\"prestart\"]}"), 0644)
 	if err != nil {
 		t.Fatal(err)
 	}

pkg/machine/qemu/config_test.go

@@ -52,23 +52,15 @@ func TestMachineFile_GetPath(t *testing.T) {
 func TestNewMachineFile(t *testing.T) {
 	empty := ""
 
-	homedir, err := os.MkdirTemp("/tmp", "homedir")
+	homedir := t.TempDir()
-	if err != nil {
+	longTemp := t.TempDir()
-		panic(err)
-	}
-	defer os.RemoveAll(homedir)
-	longTemp, err := os.MkdirTemp("/tmp", "tmpdir")
-	if err != nil {
-		panic(err)
-	}
-	defer os.RemoveAll(longTemp)
 	oldhome := os.Getenv("HOME")
 	os.Setenv("HOME", homedir) //nolint: tenv
 	defer os.Setenv("HOME", oldhome)
 
 	p := "/var/tmp/podman/my.sock"
 	longp := filepath.Join(longTemp, utils.RandomString(100), "my.sock")
-	err = os.MkdirAll(filepath.Dir(longp), 0755)
+	err := os.MkdirAll(filepath.Dir(longp), 0755)
 	if err != nil {
 		panic(err)
 	}

pkg/specgen/generate/kube/play_test.go

@@ -3,9 +3,7 @@ package kube
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"math"
-	"os"
 	"runtime"
 	"strconv"
 	"testing"
@@ -39,9 +37,7 @@ func createSecrets(t *testing.T, d string) *secrets.SecretsManager {
 }
 
 func TestEnvVarsFrom(t *testing.T) {
-	d, err := ioutil.TempDir("", "secrets")
+	d := t.TempDir()
-	assert.NoError(t, err)
-	defer os.RemoveAll(d)
 	secretsManager := createSecrets(t, d)
 
 	tests := []struct {
@@ -191,9 +187,7 @@ func TestEnvVarsFrom(t *testing.T) {
 }
 
 func TestEnvVarValue(t *testing.T) {
-	d, err := ioutil.TempDir("", "secrets")
+	d := t.TempDir()
-	assert.NoError(t, err)
-	defer os.RemoveAll(d)
 	secretsManager := createSecrets(t, d)
 	stringNumCPUs := strconv.Itoa(runtime.NumCPU())