Merge branch 'master' into pr_lazy_fpsimd_2

5 files changed, 874 insertions, 0 deletions

diff --git a/test/runner/BUILD b/test/runner/BUILD
new file mode 100644
index 000000000..9959ef9b0
--- /dev/null
+++ b/test/runner/BUILD
@@ -0,0 +1,22 @@
+load("//tools:defs.bzl", "go_binary")
+
+package(licenses = ["notice"])
+
+go_binary(
+    name = "runner",
+    testonly = 1,
+    srcs = ["runner.go"],
+    data = [
+        "//runsc",
+    ],
+    visibility = ["//:sandbox"],
+    deps = [
+        "//pkg/log",
+        "//runsc/specutils",
+        "//runsc/testutil",
+        "//test/runner/gtest",
+        "//test/uds",
+        "@com_github_opencontainers_runtime-spec//specs-go:go_default_library",
+        "@org_golang_x_sys//unix:go_default_library",
+    ],
+)
diff --git a/test/runner/defs.bzl b/test/runner/defs.bzl
new file mode 100644
index 000000000..56743a526
--- /dev/null
+++ b/test/runner/defs.bzl
@@ -0,0 +1,198 @@
+"""Defines a rule for syscall test targets."""
+
+load("//tools:defs.bzl", "default_platform", "loopback", "platforms")
+
+def _runner_test_impl(ctx):
+    # Generate a runner binary.
+    runner = ctx.actions.declare_file("%s-runner" % ctx.label.name)
+    runner_content = "\n".join([
+        "#!/bin/bash",
+        "set -euf -x -o pipefail",
+        "if [[ -n \"${TEST_UNDECLARED_OUTPUTS_DIR}\" ]]; then",
+        "  mkdir -p \"${TEST_UNDECLARED_OUTPUTS_DIR}\"",
+        "  chmod a+rwx \"${TEST_UNDECLARED_OUTPUTS_DIR}\"",
+        "fi",
+        "exec %s %s %s\n" % (
+            ctx.files.runner[0].short_path,
+            " ".join(ctx.attr.runner_args),
+            ctx.files.test[0].short_path,
+        ),
+    ])
+    ctx.actions.write(runner, runner_content, is_executable = True)
+
+    # Return with all transitive files.
+    runfiles = ctx.runfiles(
+        transitive_files = depset(transitive = [
+            depset(target.data_runfiles.files)
+            for target in (ctx.attr.runner, ctx.attr.test)
+            if hasattr(target, "data_runfiles")
+        ]),
+        files = ctx.files.runner + ctx.files.test,
+        collect_default = True,
+        collect_data = True,
+    )
+    return [DefaultInfo(executable = runner, runfiles = runfiles)]
+
+_runner_test = rule(
+    attrs = {
+        "runner": attr.label(
+            default = "//test/runner:runner",
+        ),
+        "test": attr.label(
+            mandatory = True,
+        ),
+        "runner_args": attr.string_list(),
+        "data": attr.label_list(
+            allow_files = True,
+        ),
+    },
+    test = True,
+    implementation = _runner_test_impl,
+)
+
+def _syscall_test(
+        test,
+        shard_count,
+        size,
+        platform,
+        use_tmpfs,
+        tags,
+        network = "none",
+        file_access = "exclusive",
+        overlay = False,
+        add_uds_tree = False):
+    # Prepend "runsc" to non-native platform names.
+    full_platform = platform if platform == "native" else "runsc_" + platform
+
+    # Name the test appropriately.
+    name = test.split(":")[1] + "_" + full_platform
+    if file_access == "shared":
+        name += "_shared"
+    if overlay:
+        name += "_overlay"
+    if network != "none":
+        name += "_" + network + "net"
+
+    # Apply all tags.
+    if tags == None:
+        tags = []
+
+    # Add the full_platform and file access in a tag to make it easier to run
+    # all the tests on a specific flavor. Use --test_tag_filters=ptrace,file_shared.
+    tags += [full_platform, "file_" + file_access]
+
+    # Hash this target into one of 15 buckets. This can be used to
+    # randomly split targets between different workflows.
+    hash15 = hash(native.package_name() + name) % 15
+    tags.append("hash15:" + str(hash15))
+
+    # TODO(b/139838000): Tests using hostinet must be disabled on Guitar until
+    # we figure out how to request ipv4 sockets on Guitar machines.
+    if network == "host":
+        tags.append("noguitar")
+
+    # Disable off-host networking.
+    tags.append("requires-net:loopback")
+
+    runner_args = [
+        # Arguments are passed directly to runner binary.
+        "--platform=" + platform,
+        "--network=" + network,
+        "--use-tmpfs=" + str(use_tmpfs),
+        "--file-access=" + file_access,
+        "--overlay=" + str(overlay),
+        "--add-uds-tree=" + str(add_uds_tree),
+    ]
+
+    # Call the rule above.
+    _runner_test(
+        name = name,
+        test = test,
+        runner_args = runner_args,
+        data = [loopback],
+        size = size,
+        tags = tags,
+        shard_count = shard_count,
+    )
+
+def syscall_test(
+        test,
+        shard_count = 5,
+        size = "small",
+        use_tmpfs = False,
+        add_overlay = False,
+        add_uds_tree = False,
+        add_hostinet = False,
+        tags = None):
+    """syscall_test is a macro that will create targets for all platforms.
+
+    Args:
+      test: the test target.
+      shard_count: shards for defined tests.
+      size: the defined test size.
+      use_tmpfs: use tmpfs in the defined tests.
+      add_overlay: add an overlay test.
+      add_uds_tree: add a UDS test.
+      add_hostinet: add a hostinet test.
+      tags: starting test tags.
+    """
+    if not tags:
+        tags = []
+
+    _syscall_test(
+        test = test,
+        shard_count = shard_count,
+        size = size,
+        platform = "native",
+        use_tmpfs = False,
+        add_uds_tree = add_uds_tree,
+        tags = tags,
+    )
+
+    for (platform, platform_tags) in platforms.items():
+        _syscall_test(
+            test = test,
+            shard_count = shard_count,
+            size = size,
+            platform = platform,
+            use_tmpfs = use_tmpfs,
+            add_uds_tree = add_uds_tree,
+            tags = platform_tags + tags,
+        )
+
+    if add_overlay:
+        _syscall_test(
+            test = test,
+            shard_count = shard_count,
+            size = size,
+            platform = default_platform,
+            use_tmpfs = False,  # overlay is adding a writable tmpfs on top of root.
+            add_uds_tree = add_uds_tree,
+            tags = platforms[default_platform] + tags,
+            overlay = True,
+        )
+
+    if not use_tmpfs:
+        # Also test shared gofer access.
+        _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] + tags,
+            file_access = "shared",
+        )
+
+    if add_hostinet:
+        _syscall_test(
+            test = test,
+            shard_count = shard_count,
+            size = size,
+            platform = default_platform,
+            use_tmpfs = use_tmpfs,
+            network = "host",
+            add_uds_tree = add_uds_tree,
+            tags = platforms[default_platform] + tags,
+        )
diff --git a/test/runner/gtest/BUILD b/test/runner/gtest/BUILD
new file mode 100644
index 000000000..de4b2727c
--- /dev/null
+++ b/test/runner/gtest/BUILD
@@ -0,0 +1,9 @@
+load("//tools:defs.bzl", "go_library")
+
+package(licenses = ["notice"])
+
+go_library(
+    name = "gtest",
+    srcs = ["gtest.go"],
+    visibility = ["//:sandbox"],
+)
diff --git a/test/runner/gtest/gtest.go b/test/runner/gtest/gtest.go
new file mode 100644
index 000000000..869169ad5
--- /dev/null
+++ b/test/runner/gtest/gtest.go
@@ -0,0 +1,168 @@
+// Copyright 2018 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package gtest contains helpers for running google-test tests from Go.
+package gtest
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+)
+
+var (
+	// listTestFlag is the flag that will list tests in gtest binaries.
+	listTestFlag = "--gtest_list_tests"
+
+	// filterTestFlag is the flag that will filter tests in gtest binaries.
+	filterTestFlag = "--gtest_filter"
+
+	// listBechmarkFlag is the flag that will list benchmarks in gtest binaries.
+	listBenchmarkFlag = "--benchmark_list_tests"
+
+	// filterBenchmarkFlag is the flag that will run specified benchmarks.
+	filterBenchmarkFlag = "--benchmark_filter"
+)
+
+// TestCase is a single gtest test case.
+type TestCase struct {
+	// Suite is the suite for this test.
+	Suite string
+
+	// Name is the name of this individual test.
+	Name string
+
+	// all indicates that this will run without flags. This takes
+	// precendence over benchmark below.
+	all bool
+
+	// benchmark indicates that this is a benchmark. In this case, the
+	// suite will be empty, and we will use the appropriate test and
+	// benchmark flags.
+	benchmark bool
+}
+
+// FullName returns the name of the test including the suite. It is suitable to
+// pass to "-gtest_filter".
+func (tc TestCase) FullName() string {
+	return fmt.Sprintf("%s.%s", tc.Suite, tc.Name)
+}
+
+// Args returns arguments to be passed when invoking the test.
+func (tc TestCase) Args() []string {
+	if tc.all {
+		return []string{} // No arguments.
+	}
+	if tc.benchmark {
+		return []string{
+			fmt.Sprintf("%s=^%s$", filterBenchmarkFlag, tc.Name),
+			fmt.Sprintf("%s=", filterTestFlag),
+		}
+	}
+	return []string{
+		fmt.Sprintf("%s=%s", filterTestFlag, tc.FullName()),
+	}
+}
+
+// ParseTestCases calls a gtest test binary to list its test and returns a
+// slice with the name and suite of each test.
+//
+// If benchmarks is true, then benchmarks will be included in the list of test
+// cases provided. Note that this requires the binary to support the
+// benchmarks_list_tests flag.
+func ParseTestCases(testBin string, benchmarks bool, extraArgs ...string) ([]TestCase, error) {
+	// Run to extract test cases.
+	args := append([]string{listTestFlag}, extraArgs...)
+	cmd := exec.Command(testBin, args...)
+	out, err := cmd.Output()
+	if err != nil {
+		// We failed to list tests with the given flags. Just
+		// return something that will run the binary with no
+		// flags, which should execute all tests.
+		return []TestCase{
+			TestCase{
+				Suite: "Default",
+				Name:  "All",
+				all:   true,
+			},
+		}, nil
+	}
+
+	// Parse test output.
+	var t []TestCase
+	var suite string
+	for _, line := range strings.Split(string(out), "\n") {
+		// Strip comments.
+		line = strings.Split(line, "#")[0]
+
+		// New suite?
+		if !strings.HasPrefix(line, " ") {
+			suite = strings.TrimSuffix(strings.TrimSpace(line), ".")
+			continue
+		}
+
+		// Individual test.
+		name := strings.TrimSpace(line)
+
+		// Do we have a suite yet?
+		if suite == "" {
+			return nil, fmt.Errorf("test without a suite: %v", name)
+		}
+
+		// Add this individual test.
+		t = append(t, TestCase{
+			Suite: suite,
+			Name:  name,
+		})
+	}
+
+	// Finished?
+	if !benchmarks {
+		return t, nil
+	}
+
+	// Run again to extract benchmarks.
+	args = append([]string{listBenchmarkFlag}, extraArgs...)
+	cmd = exec.Command(testBin, args...)
+	out, err = cmd.Output()
+	if err != nil {
+		// We were able to enumerate tests above, but not benchmarks?
+		// We requested them, so we return an error in this case.
+		exitErr, ok := err.(*exec.ExitError)
+		if !ok {
+			return nil, fmt.Errorf("could not enumerate gtest benchmarks: %v", err)
+		}
+		return nil, fmt.Errorf("could not enumerate gtest benchmarks: %v\nstderr\n%s", err, exitErr.Stderr)
+	}
+
+	out = []byte(strings.Trim(string(out), "\n"))
+
+	// Parse benchmark output.
+	for _, line := range strings.Split(string(out), "\n") {
+		// Strip comments.
+		line = strings.Split(line, "#")[0]
+
+		// Single benchmark.
+		name := strings.TrimSpace(line)
+
+		// Add the single benchmark.
+		t = append(t, TestCase{
+			Suite:     "Benchmarks",
+			Name:      name,
+			benchmark: true,
+		})
+	}
+
+	return t, nil
+}
diff --git a/test/runner/runner.go b/test/runner/runner.go
new file mode 100644
index 000000000..a78ef38e0
--- /dev/null
+++ b/test/runner/runner.go
@@ -0,0 +1,477 @@
+// Copyright 2018 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Binary syscall_test_runner runs the syscall test suites in gVisor
+// containers and on the host platform.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"os/signal"
+	"path/filepath"
+	"strings"
+	"syscall"
+	"testing"
+	"time"
+
+	specs "github.com/opencontainers/runtime-spec/specs-go"
+	"golang.org/x/sys/unix"
+	"gvisor.dev/gvisor/pkg/log"
+	"gvisor.dev/gvisor/runsc/specutils"
+	"gvisor.dev/gvisor/runsc/testutil"
+	"gvisor.dev/gvisor/test/runner/gtest"
+	"gvisor.dev/gvisor/test/uds"
+)
+
+var (
+	debug      = flag.Bool("debug", false, "enable debug logs")
+	strace     = flag.Bool("strace", false, "enable strace logs")
+	platform   = flag.String("platform", "ptrace", "platform to run on")
+	network    = flag.String("network", "none", "network stack to run on (sandbox, host, none)")
+	useTmpfs   = flag.Bool("use-tmpfs", false, "mounts tmpfs for /tmp")
+	fileAccess = flag.String("file-access", "exclusive", "mounts root in exclusive or shared mode")
+	overlay    = flag.Bool("overlay", false, "wrap filesystem mounts with writable tmpfs overlay")
+	parallel   = flag.Bool("parallel", false, "run tests in parallel")
+	runscPath  = flag.String("runsc", "", "path to runsc binary")
+
+	addUDSTree = flag.Bool("add-uds-tree", false, "expose a tree of UDS utilities for use in tests")
+)
+
+// runTestCaseNative runs the test case directly on the host machine.
+func runTestCaseNative(testBin string, tc gtest.TestCase, t *testing.T) {
+	// These tests might be running in parallel, so make sure they have a
+	// unique test temp dir.
+	tmpDir, err := ioutil.TempDir(testutil.TmpDir(), "")
+	if err != nil {
+		t.Fatalf("could not create temp dir: %v", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	// Replace TEST_TMPDIR in the current environment with something
+	// unique.
+	env := os.Environ()
+	newEnvVar := "TEST_TMPDIR=" + tmpDir
+	var found bool
+	for i, kv := range env {
+		if strings.HasPrefix(kv, "TEST_TMPDIR=") {
+			env[i] = newEnvVar
+			found = true
+			break
+		}
+	}
+	if !found {
+		env = append(env, newEnvVar)
+	}
+	// Remove env variables that cause the gunit binary to write output
+	// files, since they will stomp on eachother, and on the output files
+	// from this go test.
+	env = filterEnv(env, []string{"GUNIT_OUTPUT", "TEST_PREMATURE_EXIT_FILE", "XML_OUTPUT_FILE"})
+
+	// Remove shard env variables so that the gunit binary does not try to
+	// intepret them.
+	env = filterEnv(env, []string{"TEST_SHARD_INDEX", "TEST_TOTAL_SHARDS", "GTEST_SHARD_INDEX", "GTEST_TOTAL_SHARDS"})
+
+	if *addUDSTree {
+		socketDir, cleanup, err := uds.CreateSocketTree("/tmp")
+		if err != nil {
+			t.Fatalf("failed to create socket tree: %v", err)
+		}
+		defer cleanup()
+
+		env = append(env, "TEST_UDS_TREE="+socketDir)
+		// On Linux, the concept of "attach" location doesn't exist.
+		// Just pass the same path to make these test identical.
+		env = append(env, "TEST_UDS_ATTACH_TREE="+socketDir)
+	}
+
+	cmd := exec.Command(testBin, tc.Args()...)
+	cmd.Env = env
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		ws := err.(*exec.ExitError).Sys().(syscall.WaitStatus)
+		t.Errorf("test %q exited with status %d, want 0", tc.FullName(), ws.ExitStatus())
+	}
+}
+
+// runRunsc runs spec in runsc in a standard test configuration.
+//
+// runsc logs will be saved to a path in TEST_UNDECLARED_OUTPUTS_DIR.
+//
+// Returns an error if the sandboxed application exits non-zero.
+func runRunsc(tc gtest.TestCase, spec *specs.Spec) error {
+	bundleDir, err := testutil.SetupBundleDir(spec)
+	if err != nil {
+		return fmt.Errorf("SetupBundleDir failed: %v", err)
+	}
+	defer os.RemoveAll(bundleDir)
+
+	rootDir, err := testutil.SetupRootDir()
+	if err != nil {
+		return fmt.Errorf("SetupRootDir failed: %v", err)
+	}
+	defer os.RemoveAll(rootDir)
+
+	name := tc.FullName()
+	id := testutil.UniqueContainerID()
+	log.Infof("Running test %q in container %q", name, id)
+	specutils.LogSpec(spec)
+
+	args := []string{
+		"-root", rootDir,
+		"-network", *network,
+		"-log-format=text",
+		"-TESTONLY-unsafe-nonroot=true",
+		"-net-raw=true",
+		fmt.Sprintf("-panic-signal=%d", syscall.SIGTERM),
+		"-watchdog-action=panic",
+		"-platform", *platform,
+		"-file-access", *fileAccess,
+	}
+	if *overlay {
+		args = append(args, "-overlay")
+	}
+	if *debug {
+		args = append(args, "-debug", "-log-packets=true")
+	}
+	if *strace {
+		args = append(args, "-strace")
+	}
+	if *addUDSTree {
+		args = append(args, "-fsgofer-host-uds")
+	}
+
+	if outDir, ok := syscall.Getenv("TEST_UNDECLARED_OUTPUTS_DIR"); ok {
+		tdir := filepath.Join(outDir, strings.Replace(name, "/", "_", -1))
+		if err := os.MkdirAll(tdir, 0755); err != nil {
+			return fmt.Errorf("could not create test dir: %v", err)
+		}
+		debugLogDir, err := ioutil.TempDir(tdir, "runsc")
+		if err != nil {
+			return fmt.Errorf("could not create temp dir: %v", err)
+		}
+		debugLogDir += "/"
+		log.Infof("runsc logs: %s", debugLogDir)
+		args = append(args, "-debug-log", debugLogDir)
+
+		// Default -log sends messages to stderr which makes reading the test log
+		// difficult. Instead, drop them when debug log is enabled given it's a
+		// better place for these messages.
+		args = append(args, "-log=/dev/null")
+	}
+
+	// Current process doesn't have CAP_SYS_ADMIN, create user namespace and run
+	// as root inside that namespace to get it.
+	rArgs := append(args, "run", "--bundle", bundleDir, id)
+	cmd := exec.Command(*runscPath, rArgs...)
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		Cloneflags: syscall.CLONE_NEWUSER | syscall.CLONE_NEWNS,
+		// Set current user/group as root inside the namespace.
+		UidMappings: []syscall.SysProcIDMap{
+			{ContainerID: 0, HostID: os.Getuid(), Size: 1},
+		},
+		GidMappings: []syscall.SysProcIDMap{
+			{ContainerID: 0, HostID: os.Getgid(), Size: 1},
+		},
+		GidMappingsEnableSetgroups: false,
+		Credential: &syscall.Credential{
+			Uid: 0,
+			Gid: 0,
+		},
+	}
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	sig := make(chan os.Signal, 1)
+	signal.Notify(sig, syscall.SIGTERM)
+	go func() {
+		s, ok := <-sig
+		if !ok {
+			return
+		}
+		log.Warningf("%s: Got signal: %v", name, s)
+		done := make(chan bool)
+		dArgs := append([]string{}, args...)
+		dArgs = append(dArgs, "-alsologtostderr=true", "debug", "--stacks", id)
+		go func(dArgs []string) {
+			cmd := exec.Command(*runscPath, dArgs...)
+			cmd.Stdout = os.Stdout
+			cmd.Stderr = os.Stderr
+			cmd.Run()
+			done <- true
+		}(dArgs)
+
+		timeout := time.After(3 * time.Second)
+		select {
+		case <-timeout:
+			log.Infof("runsc debug --stacks is timeouted")
+		case <-done:
+		}
+
+		log.Warningf("Send SIGTERM to the sandbox process")
+		dArgs = append(args, "debug",
+			fmt.Sprintf("--signal=%d", syscall.SIGTERM),
+			id)
+		cmd := exec.Command(*runscPath, dArgs...)
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+		cmd.Run()
+	}()
+
+	err = cmd.Run()
+
+	signal.Stop(sig)
+	close(sig)
+
+	return err
+}
+
+// setupUDSTree updates the spec to expose a UDS tree for gofer socket testing.
+func setupUDSTree(spec *specs.Spec) (cleanup func(), err error) {
+	socketDir, cleanup, err := uds.CreateSocketTree("/tmp")
+	if err != nil {
+		return nil, fmt.Errorf("failed to create socket tree: %v", err)
+	}
+
+	// Standard access to entire tree.
+	spec.Mounts = append(spec.Mounts, specs.Mount{
+		Destination: "/tmp/sockets",
+		Source:      socketDir,
+		Type:        "bind",
+	})
+
+	// Individial attach points for each socket to test mounts that attach
+	// directly to the sockets.
+	spec.Mounts = append(spec.Mounts, specs.Mount{
+		Destination: "/tmp/sockets-attach/stream/echo",
+		Source:      filepath.Join(socketDir, "stream/echo"),
+		Type:        "bind",
+	})
+	spec.Mounts = append(spec.Mounts, specs.Mount{
+		Destination: "/tmp/sockets-attach/stream/nonlistening",
+		Source:      filepath.Join(socketDir, "stream/nonlistening"),
+		Type:        "bind",
+	})
+	spec.Mounts = append(spec.Mounts, specs.Mount{
+		Destination: "/tmp/sockets-attach/seqpacket/echo",
+		Source:      filepath.Join(socketDir, "seqpacket/echo"),
+		Type:        "bind",
+	})
+	spec.Mounts = append(spec.Mounts, specs.Mount{
+		Destination: "/tmp/sockets-attach/seqpacket/nonlistening",
+		Source:      filepath.Join(socketDir, "seqpacket/nonlistening"),
+		Type:        "bind",
+	})
+	spec.Mounts = append(spec.Mounts, specs.Mount{
+		Destination: "/tmp/sockets-attach/dgram/null",
+		Source:      filepath.Join(socketDir, "dgram/null"),
+		Type:        "bind",
+	})
+
+	spec.Process.Env = append(spec.Process.Env, "TEST_UDS_TREE=/tmp/sockets")
+	spec.Process.Env = append(spec.Process.Env, "TEST_UDS_ATTACH_TREE=/tmp/sockets-attach")
+
+	return cleanup, nil
+}
+
+// runsTestCaseRunsc runs the test case in runsc.
+func runTestCaseRunsc(testBin string, tc gtest.TestCase, t *testing.T) {
+	// Run a new container with the test executable and filter for the
+	// given test suite and name.
+	spec := testutil.NewSpecWithArgs(append([]string{testBin}, tc.Args()...)...)
+
+	// Mark the root as writeable, as some tests attempt to
+	// write to the rootfs, and expect EACCES, not EROFS.
+	spec.Root.Readonly = false
+
+	// Test spec comes with pre-defined mounts that we don't want. Reset it.
+	spec.Mounts = nil
+	if *useTmpfs {
+		// Forces '/tmp' to be mounted as tmpfs, otherwise test that rely on
+		// features only available in gVisor's internal tmpfs may fail.
+		spec.Mounts = append(spec.Mounts, specs.Mount{
+			Destination: "/tmp",
+			Type:        "tmpfs",
+		})
+	} else {
+		// Use a gofer-backed directory as '/tmp'.
+		//
+		// Tests might be running in parallel, so make sure each has a
+		// unique test temp dir.
+		//
+		// Some tests (e.g., sticky) access this mount from other
+		// users, so make sure it is world-accessible.
+		tmpDir, err := ioutil.TempDir(testutil.TmpDir(), "")
+		if err != nil {
+			t.Fatalf("could not create temp dir: %v", err)
+		}
+		defer os.RemoveAll(tmpDir)
+
+		if err := os.Chmod(tmpDir, 0777); err != nil {
+			t.Fatalf("could not chmod temp dir: %v", err)
+		}
+
+		spec.Mounts = append(spec.Mounts, specs.Mount{
+			Type:        "bind",
+			Destination: "/tmp",
+			Source:      tmpDir,
+		})
+	}
+
+	// Set environment variables that indicate we are
+	// running in gVisor with the given platform and network.
+	platformVar := "TEST_ON_GVISOR"
+	networkVar := "GVISOR_NETWORK"
+	env := append(os.Environ(), platformVar+"="+*platform, networkVar+"="+*network)
+
+	// Remove env variables that cause the gunit binary to write output
+	// files, since they will stomp on eachother, and on the output files
+	// from this go test.
+	env = filterEnv(env, []string{"GUNIT_OUTPUT", "TEST_PREMATURE_EXIT_FILE", "XML_OUTPUT_FILE"})
+
+	// Remove shard env variables so that the gunit binary does not try to
+	// intepret them.
+	env = filterEnv(env, []string{"TEST_SHARD_INDEX", "TEST_TOTAL_SHARDS", "GTEST_SHARD_INDEX", "GTEST_TOTAL_SHARDS"})
+
+	// Set TEST_TMPDIR to /tmp, as some of the syscall tests require it to
+	// be backed by tmpfs.
+	for i, kv := range env {
+		if strings.HasPrefix(kv, "TEST_TMPDIR=") {
+			env[i] = "TEST_TMPDIR=/tmp"
+			break
+		}
+	}
+
+	spec.Process.Env = env
+
+	if *addUDSTree {
+		cleanup, err := setupUDSTree(spec)
+		if err != nil {
+			t.Fatalf("error creating UDS tree: %v", err)
+		}
+		defer cleanup()
+	}
+
+	if err := runRunsc(tc, spec); err != nil {
+		t.Errorf("test %q failed with error %v, want nil", tc.FullName(), err)
+	}
+}
+
+// filterEnv returns an environment with the blacklisted variables removed.
+func filterEnv(env, blacklist []string) []string {
+	var out []string
+	for _, kv := range env {
+		ok := true
+		for _, k := range blacklist {
+			if strings.HasPrefix(kv, k+"=") {
+				ok = false
+				break
+			}
+		}
+		if ok {
+			out = append(out, kv)
+		}
+	}
+	return out
+}
+
+func fatalf(s string, args ...interface{}) {
+	fmt.Fprintf(os.Stderr, s+"\n", args...)
+	os.Exit(1)
+}
+
+func matchString(a, b string) (bool, error) {
+	return a == b, nil
+}
+
+func main() {
+	flag.Parse()
+	if flag.NArg() != 1 {
+		fatalf("test must be provided")
+	}
+	testBin := flag.Args()[0] // Only argument.
+
+	log.SetLevel(log.Info)
+	if *debug {
+		log.SetLevel(log.Debug)
+	}
+
+	if *platform != "native" && *runscPath == "" {
+		if err := testutil.ConfigureExePath(); err != nil {
+			panic(err.Error())
+		}
+		*runscPath = specutils.ExePath
+	}
+
+	// Make sure stdout and stderr are opened with O_APPEND, otherwise logs
+	// from outside the sandbox can (and will) stomp on logs from inside
+	// the sandbox.
+	for _, f := range []*os.File{os.Stdout, os.Stderr} {
+		flags, err := unix.FcntlInt(f.Fd(), unix.F_GETFL, 0)
+		if err != nil {
+			fatalf("error getting file flags for %v: %v", f, err)
+		}
+		if flags&unix.O_APPEND == 0 {
+			flags |= unix.O_APPEND
+			if _, err := unix.FcntlInt(f.Fd(), unix.F_SETFL, flags); err != nil {
+				fatalf("error setting file flags for %v: %v", f, err)
+			}
+		}
+	}
+
+	// Get all test cases in each binary.
+	testCases, err := gtest.ParseTestCases(testBin, true)
+	if err != nil {
+		fatalf("ParseTestCases(%q) failed: %v", testBin, err)
+	}
+
+	// Get subset of tests corresponding to shard.
+	indices, err := testutil.TestIndicesForShard(len(testCases))
+	if err != nil {
+		fatalf("TestsForShard() failed: %v", err)
+	}
+
+	// Resolve the absolute path for the binary.
+	testBin, err = filepath.Abs(testBin)
+	if err != nil {
+		fatalf("Abs() failed: %v", err)
+	}
+
+	// Run the tests.
+	var tests []testing.InternalTest
+	for _, tci := range indices {
+		// Capture tc.
+		tc := testCases[tci]
+		tests = append(tests, testing.InternalTest{
+			Name: fmt.Sprintf("%s_%s", tc.Suite, tc.Name),
+			F: func(t *testing.T) {
+				if *parallel {
+					t.Parallel()
+				}
+				if *platform == "native" {
+					// Run the test case on host.
+					runTestCaseNative(testBin, tc, t)
+				} else {
+					// Run the test case in runsc.
+					runTestCaseRunsc(testBin, tc, t)
+				}
+			},
+		})
+	}
+
+	testing.Main(matchString, tests, nil, nil)
+}