package driver

import (
	"fmt"
	"io/ioutil"
	"math/rand"
	"os"
	"path/filepath"
	"reflect"
	"runtime/debug"
	"strconv"
	"strings"
	"syscall"
	"testing"
	"time"

	docker "github.com/fsouza/go-dockerclient"
	"github.com/hashicorp/nomad/client/allocdir"
	"github.com/hashicorp/nomad/client/config"
	"github.com/hashicorp/nomad/client/driver/env"
	"github.com/hashicorp/nomad/client/testutil"
	"github.com/hashicorp/nomad/nomad/mock"
	"github.com/hashicorp/nomad/nomad/structs"
	tu "github.com/hashicorp/nomad/testutil"
)

func dockerIsRemote(t *testing.T) bool {
	client, err := docker.NewClientFromEnv()
	if err != nil {
		return false
	}

	// Technically this could be a local tcp socket but for testing purposes
	// we'll just assume that tcp is only used for remote connections.
	if client.Endpoint()[0:3] == "tcp" {
		return true
	}
	return false
}

// Ports used by tests
var (
	docker_reserved = 32768 + int(rand.Int31n(25000))
	docker_dynamic  = 32768 + int(rand.Int31n(25000))
)

// Returns a task with a reserved and dynamic port. The ports are returned
// respectively.
func dockerTask() (*structs.Task, int, int) {
	docker_reserved += 1
	docker_dynamic += 1
	return &structs.Task{
		Name: "redis-demo",
		Config: map[string]interface{}{
			"image":   "busybox",
			"load":    []string{"busybox.tar"},
			"command": "/bin/nc",
			"args":    []string{"-l", "127.0.0.1", "-p", "0"},
		},
		LogConfig: &structs.LogConfig{
			MaxFiles:      10,
			MaxFileSizeMB: 10,
		},
		Resources: &structs.Resources{
			MemoryMB: 256,
			CPU:      512,
			Networks: []*structs.NetworkResource{
				&structs.NetworkResource{
					IP:            "127.0.0.1",
					ReservedPorts: []structs.Port{{"main", docker_reserved}},
					DynamicPorts:  []structs.Port{{"REDIS", docker_dynamic}},
				},
			},
		},
	}, docker_reserved, docker_dynamic
}

// dockerSetup does all of the basic setup you need to get a running docker
// process up and running for testing. Use like:
//
//	task := taskTemplate()
//	// do custom task configuration
//	client, handle, cleanup := dockerSetup(t, task)
//	defer cleanup()
//	// do test stuff
//
// If there is a problem during setup this function will abort or skip the test
// and indicate the reason.
func dockerSetup(t *testing.T, task *structs.Task) (*docker.Client, DriverHandle, func()) {
	if !testutil.DockerIsConnected(t) {
		t.SkipNow()
	}

	client, err := docker.NewClientFromEnv()
	if err != nil {
		t.Fatalf("Failed to initialize client: %s\nStack\n%s", err, debug.Stack())
	}

	driverCtx, execCtx := testDriverContexts(task)
	driverCtx.config.Options = map[string]string{"docker.cleanup.image": "false"}
	driver := NewDockerDriver(driverCtx)
	copyImage(execCtx, task, "busybox.tar", t)

	handle, err := driver.Start(execCtx, task)
	if err != nil {
		execCtx.AllocDir.Destroy()
		t.Fatalf("Failed to start driver: %s\nStack\n%s", err, debug.Stack())
	}
	if handle == nil {
		execCtx.AllocDir.Destroy()
		t.Fatalf("handle is nil\nStack\n%s", debug.Stack())
	}

	cleanup := func() {
		handle.Kill()
		execCtx.AllocDir.Destroy()
	}

	return client, handle, cleanup
}

// This test should always pass, even if docker daemon is not available
func TestDockerDriver_Fingerprint(t *testing.T) {
	driverCtx, execCtx := testDriverContexts(&structs.Task{Name: "foo", Resources: basicResources})
	defer execCtx.AllocDir.Destroy()
	d := NewDockerDriver(driverCtx)
	node := &structs.Node{
		Attributes: make(map[string]string),
	}
	apply, err := d.Fingerprint(&config.Config{}, node)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if apply != testutil.DockerIsConnected(t) {
		t.Fatalf("Fingerprinter should detect when docker is available")
	}
	if node.Attributes["driver.docker"] != "1" {
		t.Log("Docker daemon not available. The remainder of the docker tests will be skipped.")
	}
	t.Logf("Found docker version %s", node.Attributes["driver.docker.version"])
}

func TestDockerDriver_StartOpen_Wait(t *testing.T) {
	if !testutil.DockerIsConnected(t) {
		t.SkipNow()
	}

	task := &structs.Task{
		Name: "nc-demo",
		Config: map[string]interface{}{
			"load":    []string{"busybox.tar"},
			"image":   "busybox",
			"command": "/bin/nc",
			"args":    []string{"-l", "127.0.0.1", "-p", "0"},
		},
		LogConfig: &structs.LogConfig{
			MaxFiles:      10,
			MaxFileSizeMB: 10,
		},
		Resources: basicResources,
	}

	driverCtx, execCtx := testDriverContexts(task)
	defer execCtx.AllocDir.Destroy()
	d := NewDockerDriver(driverCtx)
	copyImage(execCtx, task, "busybox.tar", t)

	handle, err := d.Start(execCtx, task)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if handle == nil {
		t.Fatalf("missing handle")
	}
	defer handle.Kill()

	// Attempt to open
	handle2, err := d.Open(execCtx, handle.ID())
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if handle2 == nil {
		t.Fatalf("missing handle")
	}
}

func TestDockerDriver_Start_Wait(t *testing.T) {
	task := &structs.Task{
		Name: "nc-demo",
		Config: map[string]interface{}{
			"load":    []string{"busybox.tar"},
			"image":   "busybox",
			"command": "/bin/echo",
			"args":    []string{"hello"},
		},
		Resources: &structs.Resources{
			MemoryMB: 256,
			CPU:      512,
		},
		LogConfig: &structs.LogConfig{
			MaxFiles:      10,
			MaxFileSizeMB: 10,
		},
	}

	_, handle, cleanup := dockerSetup(t, task)
	defer cleanup()

	// Update should be a no-op
	err := handle.Update(task)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	select {
	case res := <-handle.WaitCh():
		if !res.Successful() {
			t.Fatalf("err: %v", res)
		}
	case <-time.After(time.Duration(tu.TestMultiplier()*5) * time.Second):
		t.Fatalf("timeout")
	}
}

func TestDockerDriver_Start_LoadImage(t *testing.T) {
	if !testutil.DockerIsConnected(t) {
		t.SkipNow()
	}
	task := &structs.Task{
		Name: "busybox-demo",
		Config: map[string]interface{}{
			"image":   "busybox",
			"load":    []string{"busybox.tar"},
			"command": "/bin/echo",
			"args": []string{
				"hello",
			},
		},
		LogConfig: &structs.LogConfig{
			MaxFiles:      10,
			MaxFileSizeMB: 10,
		},
		Resources: &structs.Resources{
			MemoryMB: 256,
			CPU:      512,
		},
	}

	driverCtx, execCtx := testDriverContexts(task)
	defer execCtx.AllocDir.Destroy()
	d := NewDockerDriver(driverCtx)

	// Copy the image into the task's directory
	copyImage(execCtx, task, "busybox.tar", t)

	handle, err := d.Start(execCtx, task)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if handle == nil {
		t.Fatalf("missing handle")
	}
	defer handle.Kill()

	select {
	case res := <-handle.WaitCh():
		if !res.Successful() {
			t.Fatalf("err: %v", res)
		}
	case <-time.After(time.Duration(tu.TestMultiplier()*5) * time.Second):
		t.Fatalf("timeout")
	}

	// Check that data was written to the shared alloc directory.
	outputFile := filepath.Join(execCtx.AllocDir.LogDir(), "busybox-demo.stdout.0")
	act, err := ioutil.ReadFile(outputFile)
	if err != nil {
		t.Fatalf("Couldn't read expected output: %v", err)
	}

	exp := "hello"
	if strings.TrimSpace(string(act)) != exp {
		t.Fatalf("Command outputted %v; want %v", act, exp)
	}

}

func TestDockerDriver_Start_Wait_AllocDir(t *testing.T) {
	// This test requires that the alloc dir be mounted into docker as a volume.
	// Because this cannot happen when docker is run remotely, e.g. when running
	// docker in a VM, we skip this when we detect Docker is being run remotely.
	if !testutil.DockerIsConnected(t) || dockerIsRemote(t) {
		t.SkipNow()
	}

	exp := []byte{'w', 'i', 'n'}
	file := "output.txt"
	task := &structs.Task{
		Name: "nc-demo",
		Config: map[string]interface{}{
			"image":   "busybox",
			"load":    []string{"busybox.tar"},
			"command": "/bin/sh",
			"args": []string{
				"-c",
				fmt.Sprintf(`sleep 1; echo -n %s > $%s/%s`,
					string(exp), env.AllocDir, file),
			},
		},
		LogConfig: &structs.LogConfig{
			MaxFiles:      10,
			MaxFileSizeMB: 10,
		},
		Resources: &structs.Resources{
			MemoryMB: 256,
			CPU:      512,
		},
	}

	driverCtx, execCtx := testDriverContexts(task)
	defer execCtx.AllocDir.Destroy()
	d := NewDockerDriver(driverCtx)
	copyImage(execCtx, task, "busybox.tar", t)

	handle, err := d.Start(execCtx, task)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if handle == nil {
		t.Fatalf("missing handle")
	}
	defer handle.Kill()

	select {
	case res := <-handle.WaitCh():
		if !res.Successful() {
			t.Fatalf("err: %v", res)
		}
	case <-time.After(time.Duration(tu.TestMultiplier()*5) * time.Second):
		t.Fatalf("timeout")
	}

	// Check that data was written to the shared alloc directory.
	outputFile := filepath.Join(execCtx.AllocDir.SharedDir, file)
	act, err := ioutil.ReadFile(outputFile)
	if err != nil {
		t.Fatalf("Couldn't read expected output: %v", err)
	}

	if !reflect.DeepEqual(act, exp) {
		t.Fatalf("Command outputted %v; want %v", act, exp)
	}
}

func TestDockerDriver_Start_Kill_Wait(t *testing.T) {
	task := &structs.Task{
		Name: "nc-demo",
		Config: map[string]interface{}{
			"image":   "busybox",
			"load":    []string{"busybox.tar"},
			"command": "/bin/sleep",
			"args":    []string{"10"},
		},
		LogConfig: &structs.LogConfig{
			MaxFiles:      10,
			MaxFileSizeMB: 10,
		},
		Resources: basicResources,
	}

	_, handle, cleanup := dockerSetup(t, task)
	defer cleanup()

	go func() {
		time.Sleep(100 * time.Millisecond)
		err := handle.Kill()
		if err != nil {
			t.Fatalf("err: %v", err)
		}
	}()

	select {
	case res := <-handle.WaitCh():
		if res.Successful() {
			t.Fatalf("should err: %v", res)
		}
	case <-time.After(time.Duration(tu.TestMultiplier()*10) * time.Second):
		t.Fatalf("timeout")
	}
}

func TestDockerDriver_StartN(t *testing.T) {
	if !testutil.DockerIsConnected(t) {
		t.SkipNow()
	}

	task1, _, _ := dockerTask()
	task2, _, _ := dockerTask()
	task3, _, _ := dockerTask()
	taskList := []*structs.Task{task1, task2, task3}

	handles := make([]DriverHandle, len(taskList))

	t.Logf("Starting %d tasks", len(taskList))

	// Let's spin up a bunch of things
	var err error
	for idx, task := range taskList {
		driverCtx, execCtx := testDriverContexts(task)
		defer execCtx.AllocDir.Destroy()
		d := NewDockerDriver(driverCtx)
		copyImage(execCtx, task, "busybox.tar", t)

		handles[idx], err = d.Start(execCtx, task)
		if err != nil {
			t.Errorf("Failed starting task #%d: %s", idx+1, err)
		}
	}

	t.Log("All tasks are started. Terminating...")

	for idx, handle := range handles {
		if handle == nil {
			t.Errorf("Bad handle for task #%d", idx+1)
			continue
		}

		err := handle.Kill()
		if err != nil {
			t.Errorf("Failed stopping task #%d: %s", idx+1, err)
		}
	}

	t.Log("Test complete!")
}

func TestDockerDriver_StartNVersions(t *testing.T) {
	if !testutil.DockerIsConnected(t) {
		t.SkipNow()
	}

	task1, _, _ := dockerTask()
	task1.Config["image"] = "busybox"
	task1.Config["load"] = []string{"busybox.tar"}

	task2, _, _ := dockerTask()
	task2.Config["image"] = "busybox:musl"
	task2.Config["load"] = []string{"busybox_musl.tar"}

	task3, _, _ := dockerTask()
	task3.Config["image"] = "busybox:glibc"
	task3.Config["load"] = []string{"busybox_glibc.tar"}

	taskList := []*structs.Task{task1, task2, task3}

	handles := make([]DriverHandle, len(taskList))

	t.Logf("Starting %d tasks", len(taskList))

	// Let's spin up a bunch of things
	var err error
	for idx, task := range taskList {
		driverCtx, execCtx := testDriverContexts(task)
		defer execCtx.AllocDir.Destroy()
		d := NewDockerDriver(driverCtx)
		copyImage(execCtx, task, "busybox.tar", t)
		copyImage(execCtx, task, "busybox_musl.tar", t)
		copyImage(execCtx, task, "busybox_glibc.tar", t)

		handles[idx], err = d.Start(execCtx, task)
		if err != nil {
			t.Errorf("Failed starting task #%d: %s", idx+1, err)
		}
	}

	t.Log("All tasks are started. Terminating...")

	for idx, handle := range handles {
		if handle == nil {
			t.Errorf("Bad handle for task #%d", idx+1)
			continue
		}

		err := handle.Kill()
		if err != nil {
			t.Errorf("Failed stopping task #%d: %s", idx+1, err)
		}
	}

	t.Log("Test complete!")
}

func waitForExist(t *testing.T, client *docker.Client, handle *DockerHandle) {
	tu.WaitForResult(func() (bool, error) {
		container, err := client.InspectContainer(handle.ContainerID())
		if err != nil {
			if _, ok := err.(*docker.NoSuchContainer); !ok {
				return false, err
			}
		}

		return container != nil, nil
	}, func(err error) {
		t.Fatalf("err: %v", err)
	})
}

func TestDockerDriver_NetworkMode_Host(t *testing.T) {
	expected := "host"

	task := &structs.Task{
		Name: "nc-demo",
		Config: map[string]interface{}{
			"image":        "busybox",
			"load":         []string{"busybox.tar"},
			"command":      "/bin/nc",
			"args":         []string{"-l", "127.0.0.1", "-p", "0"},
			"network_mode": expected,
		},
		Resources: &structs.Resources{
			MemoryMB: 256,
			CPU:      512,
		},
		LogConfig: &structs.LogConfig{
			MaxFiles:      10,
			MaxFileSizeMB: 10,
		},
	}

	client, handle, cleanup := dockerSetup(t, task)
	defer cleanup()

	waitForExist(t, client, handle.(*DockerHandle))

	container, err := client.InspectContainer(handle.(*DockerHandle).ContainerID())
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	actual := container.HostConfig.NetworkMode
	if actual != expected {
		t.Fatalf("Got network mode %q; want %q", expected, actual)
	}
}

func TestDockerDriver_Labels(t *testing.T) {
	task, _, _ := dockerTask()
	task.Config["labels"] = []map[string]string{
		map[string]string{
			"label1": "value1",
			"label2": "value2",
		},
	}

	client, handle, cleanup := dockerSetup(t, task)
	defer cleanup()

	waitForExist(t, client, handle.(*DockerHandle))

	container, err := client.InspectContainer(handle.(*DockerHandle).ContainerID())
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	if want, got := 2, len(container.Config.Labels); want != got {
		t.Errorf("Wrong labels count for docker job. Expect: %d, got: %d", want, got)
	}

	if want, got := "value1", container.Config.Labels["label1"]; want != got {
		t.Errorf("Wrong label value docker job. Expect: %s, got: %s", want, got)
	}
}

func TestDockerDriver_DNS(t *testing.T) {
	task, _, _ := dockerTask()
	task.Config["dns_servers"] = []string{"8.8.8.8", "8.8.4.4"}
	task.Config["dns_search_domains"] = []string{"example.com", "example.org", "example.net"}

	client, handle, cleanup := dockerSetup(t, task)
	defer cleanup()

	waitForExist(t, client, handle.(*DockerHandle))

	container, err := client.InspectContainer(handle.(*DockerHandle).ContainerID())
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	if !reflect.DeepEqual(task.Config["dns_servers"], container.HostConfig.DNS) {
		t.Errorf("DNS Servers don't match.\nExpected:\n%s\nGot:\n%s\n", task.Config["dns_servers"], container.HostConfig.DNS)
	}

	if !reflect.DeepEqual(task.Config["dns_search_domains"], container.HostConfig.DNSSearch) {
		t.Errorf("DNS Servers don't match.\nExpected:\n%s\nGot:\n%s\n", task.Config["dns_search_domains"], container.HostConfig.DNSSearch)
	}
}

func TestDockerWorkDir(t *testing.T) {
	task, _, _ := dockerTask()
	task.Config["work_dir"] = "/some/path"

	client, handle, cleanup := dockerSetup(t, task)
	defer cleanup()

	container, err := client.InspectContainer(handle.(*DockerHandle).ContainerID())
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	if want, got := "/some/path", container.Config.WorkingDir; want != got {
		t.Errorf("Wrong working directory for docker job. Expect: %d, got: %d", want, got)
	}
}

func inSlice(needle string, haystack []string) bool {
	for _, h := range haystack {
		if h == needle {
			return true
		}
	}
	return false
}

func TestDockerDriver_PortsNoMap(t *testing.T) {
	task, res, dyn := dockerTask()

	client, handle, cleanup := dockerSetup(t, task)
	defer cleanup()

	waitForExist(t, client, handle.(*DockerHandle))

	container, err := client.InspectContainer(handle.(*DockerHandle).ContainerID())
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Verify that the correct ports are EXPOSED
	expectedExposedPorts := map[docker.Port]struct{}{
		docker.Port(fmt.Sprintf("%d/tcp", res)): struct{}{},
		docker.Port(fmt.Sprintf("%d/udp", res)): struct{}{},
		docker.Port(fmt.Sprintf("%d/tcp", dyn)): struct{}{},
		docker.Port(fmt.Sprintf("%d/udp", dyn)): struct{}{},
	}

	if !reflect.DeepEqual(container.Config.ExposedPorts, expectedExposedPorts) {
		t.Errorf("Exposed ports don't match.\nExpected:\n%s\nGot:\n%s\n", expectedExposedPorts, container.Config.ExposedPorts)
	}

	// Verify that the correct ports are FORWARDED
	expectedPortBindings := map[docker.Port][]docker.PortBinding{
		docker.Port(fmt.Sprintf("%d/tcp", res)): []docker.PortBinding{docker.PortBinding{HostIP: "127.0.0.1", HostPort: fmt.Sprintf("%d", res)}},
		docker.Port(fmt.Sprintf("%d/udp", res)): []docker.PortBinding{docker.PortBinding{HostIP: "127.0.0.1", HostPort: fmt.Sprintf("%d", res)}},
		docker.Port(fmt.Sprintf("%d/tcp", dyn)): []docker.PortBinding{docker.PortBinding{HostIP: "127.0.0.1", HostPort: fmt.Sprintf("%d", dyn)}},
		docker.Port(fmt.Sprintf("%d/udp", dyn)): []docker.PortBinding{docker.PortBinding{HostIP: "127.0.0.1", HostPort: fmt.Sprintf("%d", dyn)}},
	}

	if !reflect.DeepEqual(container.HostConfig.PortBindings, expectedPortBindings) {
		t.Errorf("Forwarded ports don't match.\nExpected:\n%s\nGot:\n%s\n", expectedPortBindings, container.HostConfig.PortBindings)
	}

	expectedEnvironment := map[string]string{
		"NOMAD_ADDR_main":  fmt.Sprintf("127.0.0.1:%d", res),
		"NOMAD_ADDR_REDIS": fmt.Sprintf("127.0.0.1:%d", dyn),
	}

	for key, val := range expectedEnvironment {
		search := fmt.Sprintf("%s=%s", key, val)
		if !inSlice(search, container.Config.Env) {
			t.Errorf("Expected to find %s in container environment: %+v", search, container.Config.Env)
		}
	}
}

func TestDockerDriver_PortsMapping(t *testing.T) {
	task, res, dyn := dockerTask()
	task.Config["port_map"] = []map[string]string{
		map[string]string{
			"main":  "8080",
			"REDIS": "6379",
		},
	}

	client, handle, cleanup := dockerSetup(t, task)
	defer cleanup()

	waitForExist(t, client, handle.(*DockerHandle))

	container, err := client.InspectContainer(handle.(*DockerHandle).ContainerID())
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Verify that the correct ports are EXPOSED
	expectedExposedPorts := map[docker.Port]struct{}{
		docker.Port("8080/tcp"): struct{}{},
		docker.Port("8080/udp"): struct{}{},
		docker.Port("6379/tcp"): struct{}{},
		docker.Port("6379/udp"): struct{}{},
	}

	if !reflect.DeepEqual(container.Config.ExposedPorts, expectedExposedPorts) {
		t.Errorf("Exposed ports don't match.\nExpected:\n%s\nGot:\n%s\n", expectedExposedPorts, container.Config.ExposedPorts)
	}

	// Verify that the correct ports are FORWARDED
	expectedPortBindings := map[docker.Port][]docker.PortBinding{
		docker.Port("8080/tcp"): []docker.PortBinding{docker.PortBinding{HostIP: "127.0.0.1", HostPort: fmt.Sprintf("%d", res)}},
		docker.Port("8080/udp"): []docker.PortBinding{docker.PortBinding{HostIP: "127.0.0.1", HostPort: fmt.Sprintf("%d", res)}},
		docker.Port("6379/tcp"): []docker.PortBinding{docker.PortBinding{HostIP: "127.0.0.1", HostPort: fmt.Sprintf("%d", dyn)}},
		docker.Port("6379/udp"): []docker.PortBinding{docker.PortBinding{HostIP: "127.0.0.1", HostPort: fmt.Sprintf("%d", dyn)}},
	}

	if !reflect.DeepEqual(container.HostConfig.PortBindings, expectedPortBindings) {
		t.Errorf("Forwarded ports don't match.\nExpected:\n%s\nGot:\n%s\n", expectedPortBindings, container.HostConfig.PortBindings)
	}

	expectedEnvironment := map[string]string{
		"NOMAD_ADDR_main":      "127.0.0.1:8080",
		"NOMAD_ADDR_REDIS":     "127.0.0.1:6379",
		"NOMAD_HOST_PORT_main": strconv.Itoa(docker_reserved),
	}

	for key, val := range expectedEnvironment {
		search := fmt.Sprintf("%s=%s", key, val)
		if !inSlice(search, container.Config.Env) {
			t.Errorf("Expected to find %s in container environment: %+v", search, container.Config.Env)
		}
	}
}

func TestDockerDriver_User(t *testing.T) {
	task := &structs.Task{
		Name: "redis-demo",
		User: "alice",
		Config: map[string]interface{}{
			"image":   "busybox",
			"load":    []string{"busybox.tar"},
			"command": "/bin/sleep",
			"args":    []string{"10000"},
		},
		Resources: &structs.Resources{
			MemoryMB: 256,
			CPU:      512,
		},
		LogConfig: &structs.LogConfig{
			MaxFiles:      10,
			MaxFileSizeMB: 10,
		},
	}

	if !testutil.DockerIsConnected(t) {
		t.SkipNow()
	}

	driverCtx, execCtx := testDriverContexts(task)
	driver := NewDockerDriver(driverCtx)
	defer execCtx.AllocDir.Destroy()
	copyImage(execCtx, task, "busybox.tar", t)

	// It should fail because the user "alice" does not exist on the given
	// image.
	handle, err := driver.Start(execCtx, task)
	if err == nil {
		handle.Kill()
		t.Fatalf("Should've failed")
	}

	if !strings.Contains(err.Error(), "alice") {
		t.Fatalf("Expected failure string not found, found %q instead", err.Error())
	}
}

func TestDockerDriver_CleanupContainer(t *testing.T) {
	task := &structs.Task{
		Name: "redis-demo",
		Config: map[string]interface{}{
			"image":   "busybox",
			"load":    []string{"busybox.tar"},
			"command": "/bin/echo",
			"args":    []string{"hello"},
		},
		Resources: &structs.Resources{
			MemoryMB: 256,
			CPU:      512,
		},
		LogConfig: &structs.LogConfig{
			MaxFiles:      10,
			MaxFileSizeMB: 10,
		},
	}

	_, handle, cleanup := dockerSetup(t, task)
	defer cleanup()

	// Update should be a no-op
	err := handle.Update(task)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	select {
	case res := <-handle.WaitCh():
		if !res.Successful() {
			t.Fatalf("err: %v", res)
		}

		time.Sleep(3 * time.Second)

		// Ensure that the container isn't present
		_, err := client.InspectContainer(handle.(*DockerHandle).containerID)
		if err == nil {
			t.Fatalf("expected to not get container")
		}

	case <-time.After(time.Duration(tu.TestMultiplier()*5) * time.Second):
		t.Fatalf("timeout")
	}
}

func TestDockerDriver_Stats(t *testing.T) {
	task := &structs.Task{
		Name: "sleep",
		Config: map[string]interface{}{
			"image":   "busybox",
			"load":    []string{"busybox.tar"},
			"command": "/bin/sleep",
			"args":    []string{"100"},
		},
		LogConfig: &structs.LogConfig{
			MaxFiles:      10,
			MaxFileSizeMB: 10,
		},
		Resources: basicResources,
	}

	_, handle, cleanup := dockerSetup(t, task)
	defer cleanup()

	waitForExist(t, client, handle.(*DockerHandle))

	go func() {
		time.Sleep(3 * time.Second)
		ru, err := handle.Stats()
		if err != nil {
			t.Fatalf("err: %v", err)
		}
		if ru.ResourceUsage == nil {
			handle.Kill()
			t.Fatalf("expected resource usage")
		}
		err = handle.Kill()
		if err != nil {
			t.Fatalf("err: %v", err)
		}
	}()

	select {
	case res := <-handle.WaitCh():
		if res.Successful() {
			t.Fatalf("should err: %v", res)
		}
	case <-time.After(time.Duration(tu.TestMultiplier()*10) * time.Second):
		t.Fatalf("timeout")
	}
}

func TestDockerDriver_Signal(t *testing.T) {
	task := &structs.Task{
		Name: "redis-demo",
		Config: map[string]interface{}{
			"image":   "busybox",
			"load":    []string{"busybox.tar"},
			"command": "/bin/sh",
			"args":    []string{"local/test.sh"},
		},
		Resources: &structs.Resources{
			MemoryMB: 256,
			CPU:      512,
		},
		LogConfig: &structs.LogConfig{
			MaxFiles:      10,
			MaxFileSizeMB: 10,
		},
	}

	driverCtx, execCtx := testDriverContexts(task)
	defer execCtx.AllocDir.Destroy()
	d := NewDockerDriver(driverCtx)

	// Copy the image into the task's directory
	copyImage(execCtx, task, "busybox.tar", t)

	testFile := filepath.Join(execCtx.AllocDir.TaskDirs["redis-demo"], allocdir.TaskLocal, "test.sh")
	testData := []byte(`
at_term() {
    echo 'Terminated.'
    exit 3
}
trap at_term USR1
while true; do
    sleep 1
done
	`)
	if err := ioutil.WriteFile(testFile, testData, 0777); err != nil {
		fmt.Errorf("Failed to write data")
	}

	handle, err := d.Start(execCtx, task)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if handle == nil {
		t.Fatalf("missing handle")
	}
	defer handle.Kill()

	waitForExist(t, handle.(*DockerHandle).client, handle.(*DockerHandle))

	time.Sleep(1 * time.Second)
	if err := handle.Signal(syscall.SIGUSR1); err != nil {
		t.Fatalf("Signal returned an error: %v", err)
	}

	select {
	case res := <-handle.WaitCh():
		if res.Successful() {
			t.Fatalf("should err: %v", res)
		}
	case <-time.After(time.Duration(tu.TestMultiplier()*5) * time.Second):
		t.Fatalf("timeout")
	}

	// Check the log file to see it exited because of the signal
	outputFile := filepath.Join(execCtx.AllocDir.LogDir(), "redis-demo.stdout.0")
	act, err := ioutil.ReadFile(outputFile)
	if err != nil {
		t.Fatalf("Couldn't read expected output: %v", err)
	}

	exp := "Terminated."
	if strings.TrimSpace(string(act)) != exp {
		t.Fatalf("Command outputted %v; want %v", act, exp)
	}
}

func setupDockerVolumes(t *testing.T, cfg *config.Config, hostpath string) (*structs.Task, Driver, *ExecContext, string, func()) {
	if !testutil.DockerIsConnected(t) {
		t.SkipNow()
	}

	randfn := fmt.Sprintf("test-%d", rand.Int())
	hostfile := filepath.Join(hostpath, randfn)
	containerFile := filepath.Join("/mnt/vol", randfn)

	task := &structs.Task{
		Name: "ls",
		Config: map[string]interface{}{
			"image":   "busybox",
			"load":    []string{"busybox.tar"},
			"command": "touch",
			"args":    []string{containerFile},
			"volumes": []string{fmt.Sprintf("%s:/mnt/vol", hostpath)},
		},
		LogConfig: &structs.LogConfig{
			MaxFiles:      10,
			MaxFileSizeMB: 10,
		},
		Resources: basicResources,
	}

	allocDir := allocdir.NewAllocDir(filepath.Join(cfg.AllocDir, structs.GenerateUUID()))
	allocDir.Build([]*structs.Task{task})
	alloc := mock.Alloc()
	execCtx := NewExecContext(allocDir, alloc.ID)
	cleanup := func() {
		execCtx.AllocDir.Destroy()
		if filepath.IsAbs(hostpath) {
			os.RemoveAll(hostpath)
		}
	}

	taskEnv, err := GetTaskEnv(allocDir, cfg.Node, task, alloc, "")
	if err != nil {
		cleanup()
		t.Fatalf("Failed to get task env: %v", err)
	}

	driverCtx := NewDriverContext(task.Name, cfg, cfg.Node, testLogger(), taskEnv)
	driver := NewDockerDriver(driverCtx)
	copyImage(execCtx, task, "busybox.tar", t)

	return task, driver, execCtx, hostfile, cleanup
}

func TestDockerDriver_VolumesDisabled(t *testing.T) {
	cfg := testConfig()
	cfg.Options = map[string]string{dockerVolumesConfigOption: "false"}

	{
		tmpvol, err := ioutil.TempDir("", "nomadtest_docker_volumesdisabled")
		if err != nil {
			t.Fatalf("error creating temporary dir: %v", err)
		}

		task, driver, execCtx, _, cleanup := setupDockerVolumes(t, cfg, tmpvol)
		defer cleanup()

		if _, err := driver.Start(execCtx, task); err == nil {
			t.Fatalf("Started driver successfully when volumes should have been disabled.")
		}
	}

	// Relative paths should still be allowed
	{
		task, driver, execCtx, fn, cleanup := setupDockerVolumes(t, cfg, ".")
		defer cleanup()

		handle, err := driver.Start(execCtx, task)
		if err != nil {
			t.Fatalf("err: %v", err)
		}
		defer handle.Kill()

		select {
		case res := <-handle.WaitCh():
			if !res.Successful() {
				t.Fatalf("unexpected err: %v", res)
			}
		case <-time.After(time.Duration(tu.TestMultiplier()*10) * time.Second):
			t.Fatalf("timeout")
		}

		if _, err := ioutil.ReadFile(filepath.Join(execCtx.AllocDir.SharedDir, fn)); err != nil {
			t.Fatalf("unexpected error reading %s: %v", fn, err)
		}
	}

}

func TestDockerDriver_VolumesEnabled(t *testing.T) {
	cfg := testConfig()

	tmpvol, err := ioutil.TempDir("", "nomadtest_docker_volumesenabled")
	if err != nil {
		t.Fatalf("error creating temporary dir: %v", err)
	}

	task, driver, execCtx, hostpath, cleanup := setupDockerVolumes(t, cfg, tmpvol)
	defer cleanup()

	handle, err := driver.Start(execCtx, task)
	if err != nil {
		t.Fatalf("Failed to start docker driver: %v", err)
	}
	defer handle.Kill()

	select {
	case res := <-handle.WaitCh():
		if !res.Successful() {
			t.Fatalf("unexpected err: %v", res)
		}
	case <-time.After(time.Duration(tu.TestMultiplier()*10) * time.Second):
		t.Fatalf("timeout")
	}

	if _, err := ioutil.ReadFile(hostpath); err != nil {
		t.Fatalf("unexpected error reading %s: %v", hostpath, err)
	}
}

func copyImage(execCtx *ExecContext, task *structs.Task, image string, t *testing.T) {
	taskDir, _ := execCtx.AllocDir.TaskDirs[task.Name]
	dst := filepath.Join(taskDir, allocdir.TaskLocal, image)
	copyFile(filepath.Join("./test-resources/docker", image), dst, t)
}