625 lines
18 KiB
Go
625 lines
18 KiB
Go
// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package container_test
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import (
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path"
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"path/filepath"
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"reflect"
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"strings"
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"sync"
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"syscall"
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"testing"
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"time"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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"golang.org/x/sys/unix"
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"gvisor.googlesource.com/gvisor/pkg/abi/linux"
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"gvisor.googlesource.com/gvisor/pkg/log"
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"gvisor.googlesource.com/gvisor/pkg/sentry/control"
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"gvisor.googlesource.com/gvisor/pkg/sentry/kernel/auth"
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"gvisor.googlesource.com/gvisor/pkg/unet"
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"gvisor.googlesource.com/gvisor/runsc/container"
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"gvisor.googlesource.com/gvisor/runsc/test/testutil"
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)
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func init() {
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log.SetLevel(log.Debug)
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if err := testutil.ConfigureExePath(); err != nil {
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panic(err.Error())
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}
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}
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// waitForProcessList waits for the given process list to show up in the container.
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func waitForProcessList(s *container.Container, expected []*control.Process) error {
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var got []*control.Process
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for start := time.Now(); time.Now().Sub(start) < 10*time.Second; {
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var err error
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got, err := s.Processes()
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if err != nil {
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return fmt.Errorf("error getting process data from container: %v", err)
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}
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if procListsEqual(got, expected) {
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return nil
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}
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// Process might not have started, try again...
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time.Sleep(10 * time.Millisecond)
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}
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return fmt.Errorf("container got process list: %s, want: %s", procListToString(got), procListToString(expected))
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}
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// procListsEqual is used to check whether 2 Process lists are equal for all
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// implemented fields.
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func procListsEqual(got, want []*control.Process) bool {
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if len(got) != len(want) {
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return false
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}
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for i := range got {
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pd1 := got[i]
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pd2 := want[i]
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// Zero out unimplemented and timing dependant fields.
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pd1.Time, pd2.Time = "", ""
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pd1.STime, pd2.STime = "", ""
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pd1.C, pd2.C = 0, 0
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if *pd1 != *pd2 {
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return false
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}
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}
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return true
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}
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func procListToString(pl []*control.Process) string {
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strs := make([]string, 0, len(pl))
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for _, p := range pl {
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strs = append(strs, fmt.Sprintf("%+v", p))
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}
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return fmt.Sprintf("[%s]", strings.Join(strs, ","))
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}
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// TestLifecycle tests the basic Create/Start/Signal/Destroy container lifecycle.
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// It verifies after each step that the container can be loaded from disk, and
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// has the correct status.
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func TestLifecycle(t *testing.T) {
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// The container will just sleep for a long time. We will kill it before
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// it finishes sleeping.
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spec := testutil.NewSpecWithArgs("sleep", "100")
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rootDir, bundleDir, conf, err := testutil.SetupContainer(spec)
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if err != nil {
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t.Fatalf("error setting up container: %v", err)
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}
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defer os.RemoveAll(rootDir)
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defer os.RemoveAll(bundleDir)
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// expectedPL lists the expected process state of the container.
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expectedPL := []*control.Process{
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{
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UID: 0,
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PID: 1,
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PPID: 0,
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C: 0,
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Cmd: "sleep",
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},
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}
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// Create the container.
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id := testutil.UniqueContainerID()
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if _, err := container.Create(id, spec, conf, bundleDir, "", ""); err != nil {
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t.Fatalf("error creating container: %v", err)
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}
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// Load the container from disk and check the status.
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s, err := container.Load(rootDir, id)
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if err != nil {
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t.Fatalf("error loading container: %v", err)
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}
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if got, want := s.Status, container.Created; got != want {
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t.Errorf("container status got %v, want %v", got, want)
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}
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// List should return the container id.
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ids, err := container.List(rootDir)
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if err != nil {
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t.Fatalf("error listing containers: %v", err)
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}
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if got, want := ids, []string{id}; !reflect.DeepEqual(got, want) {
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t.Errorf("container list got %v, want %v", got, want)
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}
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// Start the container.
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if err := s.Start(conf); err != nil {
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t.Fatalf("error starting container: %v", err)
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}
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// Load the container from disk and check the status.
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s, err = container.Load(rootDir, id)
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if err != nil {
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t.Fatalf("error loading container: %v", err)
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}
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if got, want := s.Status, container.Running; got != want {
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t.Errorf("container status got %v, want %v", got, want)
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}
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// Verify that "sleep 100" is running.
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if err := waitForProcessList(s, expectedPL); err != nil {
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t.Error(err)
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}
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// Wait on the container.
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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ws, err := s.Wait()
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if err != nil {
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t.Errorf("error waiting on container: %v", err)
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}
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if got, want := ws.Signal(), syscall.SIGTERM; got != want {
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t.Errorf("got signal %v, want %v", got, want)
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}
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wg.Done()
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}()
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// Send the container a SIGTERM which will cause it to stop.
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if err := s.Signal(syscall.SIGTERM); err != nil {
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t.Fatalf("error sending signal %v to container: %v", syscall.SIGTERM, err)
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}
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// Wait for it to die.
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wg.Wait()
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// The sandbox process should have exited by now, but it is a zombie.
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// In normal runsc usage, it will be parented to init, and init will
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// reap the sandbox. However, in this case the test runner is the
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// parent and will not reap the sandbox process, so we must do it
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// ourselves.
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p, _ := os.FindProcess(s.Sandbox.Pid)
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p.Wait()
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// Load the container from disk and check the status.
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s, err = container.Load(rootDir, id)
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if err != nil {
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t.Fatalf("error loading container: %v", err)
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}
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if got, want := s.Status, container.Stopped; got != want {
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t.Errorf("container status got %v, want %v", got, want)
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}
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// Destroy the container.
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if err := s.Destroy(); err != nil {
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t.Fatalf("error destroying container: %v", err)
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}
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// List should not return the container id.
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ids, err = container.List(rootDir)
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if err != nil {
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t.Fatalf("error listing containers: %v", err)
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}
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if len(ids) != 0 {
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t.Errorf("expected container list to be empty, but got %v", ids)
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}
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// Loading the container by id should fail.
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if _, err = container.Load(rootDir, id); err == nil {
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t.Errorf("expected loading destroyed container to fail, but it did not")
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}
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}
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// Test the we can execute the application with different path formats.
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func TestExePath(t *testing.T) {
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for _, test := range []struct {
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path string
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success bool
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}{
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{path: "true", success: true},
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{path: "bin/true", success: true},
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{path: "/bin/true", success: true},
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{path: "thisfiledoesntexit", success: false},
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{path: "bin/thisfiledoesntexit", success: false},
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{path: "/bin/thisfiledoesntexit", success: false},
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} {
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spec := testutil.NewSpecWithArgs(test.path)
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rootDir, bundleDir, conf, err := testutil.SetupContainer(spec)
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if err != nil {
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t.Fatalf("exec: %s, error setting up container: %v", test.path, err)
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}
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ws, err := container.Run(testutil.UniqueContainerID(), spec, conf, bundleDir, "", "")
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os.RemoveAll(rootDir)
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os.RemoveAll(bundleDir)
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if test.success {
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if err != nil {
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t.Errorf("exec: %s, error running container: %v", test.path, err)
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}
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if ws.ExitStatus() != 0 {
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t.Errorf("exec: %s, got exit status %v want %v", test.path, ws.ExitStatus(), 0)
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}
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} else {
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if err == nil {
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t.Errorf("exec: %s, got: no error, want: error", test.path)
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}
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}
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}
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}
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// Test the we can retrieve the application exit status from the container.
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func TestAppExitStatus(t *testing.T) {
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// First container will succeed.
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succSpec := testutil.NewSpecWithArgs("true")
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rootDir, bundleDir, conf, err := testutil.SetupContainer(succSpec)
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if err != nil {
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t.Fatalf("error setting up container: %v", err)
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}
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defer os.RemoveAll(rootDir)
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defer os.RemoveAll(bundleDir)
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ws, err := container.Run(testutil.UniqueContainerID(), succSpec, conf, bundleDir, "", "")
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if err != nil {
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t.Fatalf("error running container: %v", err)
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}
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if ws.ExitStatus() != 0 {
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t.Errorf("got exit status %v want %v", ws.ExitStatus(), 0)
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}
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// Second container exits with non-zero status.
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wantStatus := 123
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errSpec := testutil.NewSpecWithArgs("bash", "-c", fmt.Sprintf("exit %d", wantStatus))
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rootDir2, bundleDir2, conf, err := testutil.SetupContainer(errSpec)
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if err != nil {
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t.Fatalf("error setting up container: %v", err)
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}
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defer os.RemoveAll(rootDir2)
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defer os.RemoveAll(bundleDir2)
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ws, err = container.Run(testutil.UniqueContainerID(), succSpec, conf, bundleDir2, "", "")
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if err != nil {
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t.Fatalf("error running container: %v", err)
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}
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if ws.ExitStatus() != wantStatus {
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t.Errorf("got exit status %v want %v", ws.ExitStatus(), wantStatus)
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}
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}
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// TestExec verifies that a container can exec a new program.
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func TestExec(t *testing.T) {
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const uid = 343
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spec := testutil.NewSpecWithArgs("sleep", "100")
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rootDir, bundleDir, conf, err := testutil.SetupContainer(spec)
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if err != nil {
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t.Fatalf("error setting up container: %v", err)
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}
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defer os.RemoveAll(rootDir)
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defer os.RemoveAll(bundleDir)
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// Create and start the container.
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s, err := container.Create(testutil.UniqueContainerID(), spec, conf, bundleDir, "", "")
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if err != nil {
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t.Fatalf("error creating container: %v", err)
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}
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defer s.Destroy()
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if err := s.Start(conf); err != nil {
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t.Fatalf("error starting container: %v", err)
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}
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// expectedPL lists the expected process state of the container.
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expectedPL := []*control.Process{
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{
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UID: 0,
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PID: 1,
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PPID: 0,
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C: 0,
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Cmd: "sleep",
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},
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{
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UID: uid,
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PID: 2,
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PPID: 0,
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C: 0,
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Cmd: "sleep",
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},
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}
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// Verify that "sleep 100" is running.
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if err := waitForProcessList(s, expectedPL[:1]); err != nil {
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t.Error(err)
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}
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execArgs := control.ExecArgs{
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Filename: "/bin/sleep",
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Argv: []string{"sleep", "5"},
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Envv: []string{"PATH=" + os.Getenv("PATH")},
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WorkingDirectory: "/",
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KUID: uid,
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}
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// Verify that "sleep 100" and "sleep 5" are running after exec.
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// First, start running exec (whick blocks).
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status := make(chan error, 1)
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go func() {
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exitStatus, err := s.Execute(&execArgs)
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if err != nil {
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status <- err
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} else if exitStatus != 0 {
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status <- fmt.Errorf("failed with exit status: %v", exitStatus)
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} else {
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status <- nil
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}
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}()
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if err := waitForProcessList(s, expectedPL); err != nil {
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t.Fatal(err)
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}
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// Ensure that exec finished without error.
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select {
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case <-time.After(10 * time.Second):
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t.Fatalf("container timed out waiting for exec to finish.")
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case st := <-status:
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if st != nil {
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t.Errorf("container failed to exec %v: %v", execArgs, err)
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}
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}
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}
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// TestCapabilities verifies that:
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// - Running exec as non-root UID and GID will result in an error (because the
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// executable file can't be read).
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// - Running exec as non-root with CAP_DAC_OVERRIDE succeeds because it skips
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// this check.
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func TestCapabilities(t *testing.T) {
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const uid = 343
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const gid = 2401
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spec := testutil.NewSpecWithArgs("sleep", "100")
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// We generate files in the host temporary directory.
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spec.Mounts = append(spec.Mounts, specs.Mount{
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Destination: os.TempDir(),
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Source: os.TempDir(),
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Type: "bind",
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})
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rootDir, bundleDir, conf, err := testutil.SetupContainer(spec)
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if err != nil {
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t.Fatalf("error setting up container: %v", err)
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}
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defer os.RemoveAll(rootDir)
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defer os.RemoveAll(bundleDir)
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// Create and start the container.
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s, err := container.Create(testutil.UniqueContainerID(), spec, conf, bundleDir, "", "")
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if err != nil {
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t.Fatalf("error creating container: %v", err)
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}
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defer s.Destroy()
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if err := s.Start(conf); err != nil {
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t.Fatalf("error starting container: %v", err)
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}
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// expectedPL lists the expected process state of the container.
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expectedPL := []*control.Process{
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{
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UID: 0,
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PID: 1,
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PPID: 0,
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C: 0,
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Cmd: "sleep",
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},
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{
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UID: uid,
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PID: 2,
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PPID: 0,
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C: 0,
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Cmd: "exe",
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},
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}
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if err := waitForProcessList(s, expectedPL[:1]); err != nil {
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t.Fatalf("Failed to wait for sleep to start, err: %v", err)
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}
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// Create an executable that can't be run with the specified UID:GID.
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// This shouldn't be callable within the container until we add the
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// CAP_DAC_OVERRIDE capability to skip the access check.
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exePath := filepath.Join(rootDir, "exe")
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if err := ioutil.WriteFile(exePath, []byte("#!/bin/sh\necho hello"), 0770); err != nil {
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t.Fatalf("couldn't create executable: %v", err)
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}
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defer os.Remove(exePath)
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// Need to traverse the intermediate directory.
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os.Chmod(rootDir, 0755)
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execArgs := control.ExecArgs{
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Filename: exePath,
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Argv: []string{exePath},
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Envv: []string{"PATH=" + os.Getenv("PATH")},
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WorkingDirectory: "/",
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KUID: uid,
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KGID: gid,
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Capabilities: &auth.TaskCapabilities{},
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}
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// "exe" should fail because we don't have the necessary permissions.
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if _, err := s.Execute(&execArgs); err == nil {
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t.Fatalf("container executed without error, but an error was expected")
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}
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// Now we run with the capability enabled and should succeed.
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execArgs.Capabilities = &auth.TaskCapabilities{
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EffectiveCaps: auth.CapabilitySetOf(linux.CAP_DAC_OVERRIDE),
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}
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// "exe" should not fail this time.
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if _, err := s.Execute(&execArgs); err != nil {
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t.Fatalf("container failed to exec %v: %v", execArgs, err)
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}
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}
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// Test that an tty FD is sent over the console socket if one is provided.
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func TestConsoleSocket(t *testing.T) {
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spec := testutil.NewSpecWithArgs("true")
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rootDir, bundleDir, conf, err := testutil.SetupContainer(spec)
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if err != nil {
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t.Fatalf("error setting up container: %v", err)
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}
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defer os.RemoveAll(rootDir)
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defer os.RemoveAll(bundleDir)
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// Create a named socket and start listening. We use a relative path
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// to avoid overflowing the unix path length limit (108 chars).
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socketPath := filepath.Join(bundleDir, "socket")
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cwd, err := os.Getwd()
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if err != nil {
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t.Fatalf("error getting cwd: %v", err)
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}
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socketRelPath, err := filepath.Rel(cwd, socketPath)
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if err != nil {
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t.Fatalf("error getting relative path for %q from cwd %q: %v", socketPath, cwd, err)
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}
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if len(socketRelPath) > len(socketPath) {
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socketRelPath = socketPath
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}
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srv, err := unet.BindAndListen(socketRelPath, false)
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if err != nil {
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t.Fatalf("error binding and listening to socket %q: %v", socketPath, err)
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}
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defer os.Remove(socketPath)
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// Create the container and pass the socket name.
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id := testutil.UniqueContainerID()
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s, err := container.Create(id, spec, conf, bundleDir, socketRelPath, "")
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if err != nil {
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t.Fatalf("error creating container: %v", err)
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}
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// Open the othe end of the socket.
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sock, err := srv.Accept()
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if err != nil {
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t.Fatalf("error accepting socket connection: %v", err)
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}
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|
|
// Allow 3 fds to be received. We only expect 1.
|
|
r := sock.Reader(true /* blocking */)
|
|
r.EnableFDs(1)
|
|
|
|
// The socket is closed right after sending the FD, so EOF is
|
|
// an allowed error.
|
|
b := [][]byte{{}}
|
|
if _, err := r.ReadVec(b); err != nil && err != io.EOF {
|
|
t.Fatalf("error reading from socket connection: %v", err)
|
|
}
|
|
|
|
// We should have gotten a control message.
|
|
fds, err := r.ExtractFDs()
|
|
if err != nil {
|
|
t.Fatalf("error extracting fds from socket connection: %v", err)
|
|
}
|
|
if len(fds) != 1 {
|
|
t.Fatalf("got %d fds from socket, wanted 1", len(fds))
|
|
}
|
|
|
|
// Verify that the fd is a terminal.
|
|
if _, err := unix.IoctlGetTermios(fds[0], unix.TCGETS); err != nil {
|
|
t.Errorf("fd is not a terminal (ioctl TGGETS got %v)", err)
|
|
}
|
|
|
|
// Shut it down.
|
|
if err := s.Destroy(); err != nil {
|
|
t.Fatalf("error destroying container: %v", err)
|
|
}
|
|
|
|
// Close socket.
|
|
if err := srv.Close(); err != nil {
|
|
t.Fatalf("error destroying container: %v", err)
|
|
}
|
|
}
|
|
|
|
func TestSpecUnsupported(t *testing.T) {
|
|
spec := testutil.NewSpecWithArgs("/bin/true")
|
|
spec.Process.SelinuxLabel = "somelabel"
|
|
|
|
// These are normally set by docker and will just cause warnings to be logged.
|
|
spec.Process.ApparmorProfile = "someprofile"
|
|
spec.Linux = &specs.Linux{Seccomp: &specs.LinuxSeccomp{}}
|
|
|
|
rootDir, bundleDir, conf, err := testutil.SetupContainer(spec)
|
|
if err != nil {
|
|
t.Fatalf("error setting up container: %v", err)
|
|
}
|
|
defer os.RemoveAll(rootDir)
|
|
defer os.RemoveAll(bundleDir)
|
|
|
|
id := testutil.UniqueContainerID()
|
|
_, err = container.Create(id, spec, conf, bundleDir, "", "")
|
|
if err == nil || !strings.Contains(err.Error(), "is not supported") {
|
|
t.Errorf("container.Create() wrong error, got: %v, want: *is not supported, spec.Process: %+v", err, spec.Process)
|
|
}
|
|
}
|
|
|
|
// TestRunNonRoot checks that sandbox can be configured when running as
|
|
// non-priviledged user.
|
|
func TestRunNonRoot(t *testing.T) {
|
|
spec := testutil.NewSpecWithArgs("/bin/true")
|
|
spec.Process.User.UID = 343
|
|
spec.Process.User.GID = 2401
|
|
|
|
// User that container runs as can't list '$TMP/blocked' and would fail to
|
|
// mount it.
|
|
dir, err := ioutil.TempDir("", "blocked")
|
|
if err != nil {
|
|
t.Fatalf("ioutil.TempDir() failed: %v", err)
|
|
}
|
|
if err := os.Chmod(dir, 0700); err != nil {
|
|
t.Fatalf("os.MkDir(%q) failed: %v", dir, err)
|
|
}
|
|
dir = path.Join(dir, "test")
|
|
if err := os.Mkdir(dir, 0755); err != nil {
|
|
t.Fatalf("os.MkDir(%q) failed: %v", dir, err)
|
|
}
|
|
|
|
// We generate files in the host temporary directory.
|
|
spec.Mounts = append(spec.Mounts, specs.Mount{
|
|
Destination: dir,
|
|
Source: dir,
|
|
Type: "bind",
|
|
})
|
|
|
|
rootDir, bundleDir, conf, err := testutil.SetupContainer(spec)
|
|
if err != nil {
|
|
t.Fatalf("error setting up container: %v", err)
|
|
}
|
|
defer os.RemoveAll(rootDir)
|
|
defer os.RemoveAll(bundleDir)
|
|
|
|
// Create, start and wait for the container.
|
|
s, err := container.Create(testutil.UniqueContainerID(), spec, conf, bundleDir, "", "")
|
|
if err != nil {
|
|
t.Fatalf("error creating container: %v", err)
|
|
}
|
|
defer s.Destroy()
|
|
if err := s.Start(conf); err != nil {
|
|
t.Fatalf("error starting container: %v", err)
|
|
}
|
|
ws, err := s.Wait()
|
|
if err != nil {
|
|
t.Errorf("error waiting on container: %v", err)
|
|
}
|
|
if !ws.Exited() || ws.ExitStatus() != 0 {
|
|
t.Errorf("container failed, waitStatus: %v", ws)
|
|
}
|
|
}
|