API: Provide the HostConfig during "run".

Currently, the HostConfig is only passed from the CLI to Docker only
when issuing a docker create, but not when doing a docker run.

In the near future, in order to allocate ports at creation time rather
than start time, we will need to have the HostConfig readily available
at container creation.

This PR makes the client always pass the HostConfig when creating a
container (regardless of whether it's for a run or create).

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

api/client/commands.go

@@ -2027,12 +2027,7 @@ func (cli *DockerCli) createContainer(config *runconfig.Config, hostConfig *runc
 		containerValues.Set("name", name)
 	}
 
-	var data interface{}
-	if hostConfig != nil {
-		data = runconfig.MergeConfigs(config, hostConfig)
-	} else {
-		data = config
-	}
+	mergedConfig := runconfig.MergeConfigs(config, hostConfig)
 
 	var containerIDFile *cidFile
 	if cidfile != "" {
@@ -2044,7 +2039,7 @@ func (cli *DockerCli) createContainer(config *runconfig.Config, hostConfig *runc
 	}
 
 	//create the container
-	stream, statusCode, err := cli.call("POST", "/containers/create?"+containerValues.Encode(), data, false)
+	stream, statusCode, err := cli.call("POST", "/containers/create?"+containerValues.Encode(), mergedConfig, false)
 	//if image not found try to pull it
 	if statusCode == 404 {
 		fmt.Fprintf(cli.err, "Unable to find image '%s' locally\n", config.Image)
@@ -2053,7 +2048,7 @@ func (cli *DockerCli) createContainer(config *runconfig.Config, hostConfig *runc
 			return nil, err
 		}
 		// Retry
-		if stream, _, err = cli.call("POST", "/containers/create?"+containerValues.Encode(), data, false); err != nil {
+		if stream, _, err = cli.call("POST", "/containers/create?"+containerValues.Encode(), mergedConfig, false); err != nil {
 			return nil, err
 		}
 	} else if err != nil {
@@ -2155,7 +2150,7 @@ func (cli *DockerCli) CmdRun(args ...string) error {
 		sigProxy = false
 	}
 
-	runResult, err := cli.createContainer(config, nil, hostConfig.ContainerIDFile, *flName)
+	runResult, err := cli.createContainer(config, hostConfig, hostConfig.ContainerIDFile, *flName)
 	if err != nil {
 		return err
 	}

builder/internals.go

@@ -173,7 +173,7 @@ func (b *Builder) runContextCommand(args []string, allowRemote bool, allowDecomp
 		return nil
 	}
 
-	container, _, err := b.Daemon.Create(b.Config, "")
+	container, _, err := b.Daemon.Create(b.Config, nil, "")
 	if err != nil {
 		return err
 	}
@@ -442,7 +442,7 @@ func (b *Builder) create() (*daemon.Container, error) {
 	config := *b.Config
 
 	// Create the container
-	c, warnings, err := b.Daemon.Create(b.Config, "")
+	c, warnings, err := b.Daemon.Create(b.Config, nil, "")
 	if err != nil {
 		return nil, err
 	}

daemon/create.go

@@ -26,7 +26,16 @@ func (daemon *Daemon) ContainerCreate(job *engine.Job) engine.Status {
 		job.Errorf("Your kernel does not support swap limit capabilities. Limitation discarded.\n")
 		config.MemorySwap = -1
 	}
-	container, buildWarnings, err := daemon.Create(config, name)
+
+	var hostConfig *runconfig.HostConfig
+	if job.EnvExists("HostConfig") {
+		hostConfig = runconfig.ContainerHostConfigFromJob(job)
+	} else {
+		// Older versions of the API don't provide a HostConfig.
+		hostConfig = nil
+	}
+
+	container, buildWarnings, err := daemon.Create(config, hostConfig, name)
 	if err != nil {
 		if daemon.Graph().IsNotExist(err) {
 			_, tag := parsers.ParseRepositoryTag(config.Image)
@@ -51,18 +60,11 @@ func (daemon *Daemon) ContainerCreate(job *engine.Job) engine.Status {
 		job.Errorf("%s\n", warning)
 	}
 
-	if job.EnvExists("HostConfig") {
-		hostConfig := runconfig.ContainerHostConfigFromJob(job)
-		if err := daemon.setHostConfig(container, hostConfig); err != nil {
-			return job.Error(err)
-		}
-	}
-
 	return engine.StatusOK
 }
 
 // Create creates a new container from the given configuration with a given name.
-func (daemon *Daemon) Create(config *runconfig.Config, name string) (*Container, []string, error) {
+func (daemon *Daemon) Create(config *runconfig.Config, hostConfig *runconfig.HostConfig, name string) (*Container, []string, error) {
 	var (
 		container *Container
 		warnings  []string
@@ -84,6 +86,11 @@ func (daemon *Daemon) Create(config *runconfig.Config, name string) (*Container,
 	if err := daemon.createRootfs(container, img); err != nil {
 		return nil, nil, err
 	}
+	if hostConfig != nil {
+		if err := daemon.setHostConfig(container, hostConfig); err != nil {
+			return nil, nil, err
+		}
+	}
 	if err := container.ToDisk(); err != nil {
 		return nil, nil, err
 	}

daemon/start.go

@@ -27,6 +27,8 @@ func (daemon *Daemon) ContainerStart(job *engine.Job) engine.Status {
 	}
 
 	// If no environment was set, then no hostconfig was passed.
+	// This is kept for backward compatibility - hostconfig should be passed when
+	// creating a container, not during start.
 	if len(job.Environ()) > 0 {
 		hostConfig := runconfig.ContainerHostConfigFromJob(job)
 		if err := daemon.setHostConfig(container, hostConfig); err != nil {

integration/container_test.go

@@ -18,6 +18,7 @@ func TestRestartStdin(t *testing.T) {
 
 		OpenStdin: true,
 	},
+		&runconfig.HostConfig{},
 		"",
 	)
 	if err != nil {
@@ -94,6 +95,7 @@ func TestStdin(t *testing.T) {
 
 		OpenStdin: true,
 	},
+		&runconfig.HostConfig{},
 		"",
 	)
 	if err != nil {
@@ -139,6 +141,7 @@ func TestTty(t *testing.T) {
 
 		OpenStdin: true,
 	},
+		&runconfig.HostConfig{},
 		"",
 	)
 	if err != nil {
@@ -183,6 +186,7 @@ func BenchmarkRunSequential(b *testing.B) {
 			Image: GetTestImage(daemon).ID,
 			Cmd:   []string{"echo", "-n", "foo"},
 		},
+			&runconfig.HostConfig{},
 			"",
 		)
 		if err != nil {
@@ -216,6 +220,7 @@ func BenchmarkRunParallel(b *testing.B) {
 				Image: GetTestImage(daemon).ID,
 				Cmd:   []string{"echo", "-n", "foo"},
 			},
+				&runconfig.HostConfig{},
 				"",
 			)
 			if err != nil {

integration/runtime_test.go

@@ -266,6 +266,7 @@ func TestDaemonCreate(t *testing.T) {
 		Image: GetTestImage(daemon).ID,
 		Cmd:   []string{"ls", "-al"},
 	},
+		&runconfig.HostConfig{},
 		"",
 	)
 	if err != nil {
@@ -309,14 +310,15 @@ func TestDaemonCreate(t *testing.T) {
 			Image: GetTestImage(daemon).ID,
 			Cmd:   []string{"ls", "-al"},
 		},
+		&runconfig.HostConfig{},
 		"conflictname",
 	)
-	if _, _, err := daemon.Create(&runconfig.Config{Image: GetTestImage(daemon).ID, Cmd: []string{"ls", "-al"}}, testContainer.Name); err == nil || !strings.Contains(err.Error(), utils.TruncateID(testContainer.ID)) {
+	if _, _, err := daemon.Create(&runconfig.Config{Image: GetTestImage(daemon).ID, Cmd: []string{"ls", "-al"}}, &runconfig.HostConfig{}, testContainer.Name); err == nil || !strings.Contains(err.Error(), utils.TruncateID(testContainer.ID)) {
 		t.Fatalf("Name conflict error doesn't include the correct short id. Message was: %s", err.Error())
 	}
 
 	// Make sure create with bad parameters returns an error
-	if _, _, err = daemon.Create(&runconfig.Config{Image: GetTestImage(daemon).ID}, ""); err == nil {
+	if _, _, err = daemon.Create(&runconfig.Config{Image: GetTestImage(daemon).ID}, &runconfig.HostConfig{}, ""); err == nil {
 		t.Fatal("Builder.Create should throw an error when Cmd is missing")
 	}
 
@@ -325,6 +327,7 @@ func TestDaemonCreate(t *testing.T) {
 			Image: GetTestImage(daemon).ID,
 			Cmd:   []string{},
 		},
+		&runconfig.HostConfig{},
 		"",
 	); err == nil {
 		t.Fatal("Builder.Create should throw an error when Cmd is empty")
@@ -335,7 +338,7 @@ func TestDaemonCreate(t *testing.T) {
 		Cmd:       []string{"/bin/ls"},
 		PortSpecs: []string{"80"},
 	}
-	container, _, err = daemon.Create(config, "")
+	container, _, err = daemon.Create(config, &runconfig.HostConfig{}, "")
 
 	_, err = daemon.Commit(container, "testrepo", "testtag", "", "", true, config)
 	if err != nil {
@@ -348,6 +351,7 @@ func TestDaemonCreate(t *testing.T) {
 		Cmd:       []string{"ls", "-al"},
 		PortSpecs: []string{"80:8000"},
 	},
+		&runconfig.HostConfig{},
 		"",
 	)
 	if err != nil {
@@ -365,7 +369,9 @@ func TestDestroy(t *testing.T) {
 	container, _, err := daemon.Create(&runconfig.Config{
 		Image: GetTestImage(daemon).ID,
 		Cmd:   []string{"ls", "-al"},
-	}, "")
+	},
+		&runconfig.HostConfig{},
+		"")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -857,7 +863,9 @@ func TestDestroyWithInitLayer(t *testing.T) {
 	container, _, err := daemon.Create(&runconfig.Config{
 		Image: GetTestImage(daemon).ID,
 		Cmd:   []string{"ls", "-al"},
-	}, "")
+	},
+		&runconfig.HostConfig{},
+		"")
 
 	if err != nil {
 		t.Fatal(err)

integration/utils_test.go

@@ -263,7 +263,7 @@ func mkContainer(r *daemon.Daemon, args []string, t *testing.T) (*daemon.Contain
 	if config.Image == "_" {
 		config.Image = GetTestImage(r).ID
 	}
-	c, _, err := r.Create(config, "")
+	c, _, err := r.Create(config, nil, "")
 	if err != nil {
 		return nil, nil, err
 	}