Enable more VFS2 tests

Updates #1487

PiperOrigin-RevId: 335516732

pkg/test/testutil/testutil.go

@@ -270,7 +270,7 @@ func RandomID(prefix string) string {
 // same name, sometimes between test runs the socket does not get cleaned up
 // quickly enough, causing container creation to fail.
 func RandomContainerID() string {
-	return RandomID("test-container-")
+	return RandomID("test-container")
 }
 
 // Copy copies file from src to dst.

runsc/boot/loader_test.go

@@ -264,7 +264,7 @@ type CreateMountTestcase struct {
 	expectedPaths []string
 }
 
-func createMountTestcases(vfs2 bool) []*CreateMountTestcase {
+func createMountTestcases() []*CreateMountTestcase {
 	testCases := []*CreateMountTestcase{
 		&CreateMountTestcase{
 			// Only proc.
@@ -409,32 +409,26 @@ func createMountTestcases(vfs2 bool) []*CreateMountTestcase {
 					Destination: "/proc",
 					Type:        "tmpfs",
 				},
-				// TODO (gvisor.dev/issue/1487): Re-add this case when sysfs supports
-				//  MkDirAt in VFS2 (and remove the reduntant append).
-				// {
-				//		Destination: "/sys/bar",
-				//		Type:        "tmpfs",
-				//	},
-				//
+				{
+					Destination: "/sys/bar",
+					Type:        "tmpfs",
+				},
+
 				{
 					Destination: "/tmp/baz",
 					Type:        "tmpfs",
 				},
 			},
 		},
-		expectedPaths: []string{"/proc", "/sys" /* "/sys/bar" ,*/, "/tmp", "/tmp/baz"},
+		expectedPaths: []string{"/proc", "/sys", "/sys/bar", "/tmp", "/tmp/baz"},
 	}
 
-	if !vfs2 {
-		vfsCase.spec.Mounts = append(vfsCase.spec.Mounts, specs.Mount{Destination: "/sys/bar", Type: "tmpfs"})
-		vfsCase.expectedPaths = append(vfsCase.expectedPaths, "/sys/bar")
-	}
 	return append(testCases, vfsCase)
 }
 
 // Test that MountNamespace can be created with various specs.
 func TestCreateMountNamespace(t *testing.T) {
-	for _, tc := range createMountTestcases(false /* vfs2 */) {
+	for _, tc := range createMountTestcases() {
 		t.Run(tc.name, func(t *testing.T) {
 			conf := testConfig()
 			ctx := contexttest.Context(t)
@@ -471,7 +465,7 @@ func TestCreateMountNamespace(t *testing.T) {
 
 // Test that MountNamespace can be created with various specs.
 func TestCreateMountNamespaceVFS2(t *testing.T) {
-	for _, tc := range createMountTestcases(true /* vfs2 */) {
+	for _, tc := range createMountTestcases() {
 		t.Run(tc.name, func(t *testing.T) {
 			spec := testSpec()
 			spec.Mounts = tc.spec.Mounts

runsc/container/container_test.go

@@ -316,6 +316,7 @@ func configs(t *testing.T, opts ...configOption) map[string]*config.Config {
 	return cs
 }
 
+// TODO(gvisor.dev/issue/1624): Merge with configs when VFS2 is the default.
 func configsWithVFS2(t *testing.T, opts ...configOption) map[string]*config.Config {
 	all := configs(t, opts...)
 	for key, value := range configs(t, opts...) {
@@ -894,13 +895,15 @@ func TestKillPid(t *testing.T) {
 	}
 }
 
-// TestCheckpointRestore creates a container that continuously writes successive integers
-// to a file. To test checkpoint and restore functionality, the container is
-// checkpointed and the last number printed to the file is recorded. Then, it is restored in two
-// new containers and the first number printed from these containers is checked. Both should
-// be the next consecutive number after the last number from the checkpointed container.
+// TestCheckpointRestore creates a container that continuously writes successive
+// integers to a file. To test checkpoint and restore functionality, the
+// container is checkpointed and the last number printed to the file is
+// recorded. Then, it is restored in two new containers and the first number
+// printed from these containers is checked. Both should be the next consecutive
+// number after the last number from the checkpointed container.
 func TestCheckpointRestore(t *testing.T) {
 	// Skip overlay because test requires writing to host file.
+	// TODO(gvisor.dev/issue/1663): Add VFS when S/R support is added.
 	for name, conf := range configs(t, noOverlay...) {
 		t.Run(name, func(t *testing.T) {
 			dir, err := ioutil.TempDir(testutil.TmpDir(), "checkpoint-test")
@@ -1062,6 +1065,7 @@ func TestCheckpointRestore(t *testing.T) {
 // with filesystem Unix Domain Socket use.
 func TestUnixDomainSockets(t *testing.T) {
 	// Skip overlay because test requires writing to host file.
+	// TODO(gvisor.dev/issue/1663): Add VFS when S/R support is added.
 	for name, conf := range configs(t, noOverlay...) {
 		t.Run(name, func(t *testing.T) {
 			// UDS path is limited to 108 chars for compatibility with older systems.
@@ -1199,7 +1203,7 @@ func TestUnixDomainSockets(t *testing.T) {
 // recreated. Then it resumes the container, verify that the file gets created
 // again.
 func TestPauseResume(t *testing.T) {
-	for name, conf := range configs(t, noOverlay...) {
+	for name, conf := range configsWithVFS2(t, noOverlay...) {
 		t.Run(name, func(t *testing.T) {
 			tmpDir, err := ioutil.TempDir(testutil.TmpDir(), "lock")
 			if err != nil {

test/runner/defs.bzl

@@ -203,7 +203,6 @@ def syscall_test(
             tags = platform_tags + tags,
         )
 
-    # TODO(gvisor.dev/issue/1487): Enable VFS2 overlay tests.
     if add_overlay:
         _syscall_test(
             test = test,
@@ -216,6 +215,23 @@ def syscall_test(
             overlay = True,
         )
 
+        # TODO(gvisor.dev/issue/4407): Remove tags to enable VFS2 overlay tests.
+        overlay_vfs2_tags = list(vfs2_tags)
+        overlay_vfs2_tags.append("manual")
+        overlay_vfs2_tags.append("noguitar")
+        overlay_vfs2_tags.append("notap")
+        _syscall_test(
+            test = test,
+            shard_count = shard_count,
+            size = size,
+            platform = default_platform,
+            use_tmpfs = use_tmpfs,
+            add_uds_tree = add_uds_tree,
+            tags = platforms[default_platform] + overlay_vfs2_tags,
+            overlay = True,
+            vfs2 = True,
+        )
+
     if add_hostinet:
         _syscall_test(
             test = test,