Add a docker commit step to the docker builder that runs instead of export if export_path not present

builder/docker/builder.go

@@ -35,6 +35,7 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 		&StepPull{},
 		&StepRun{},
 		&StepProvision{},
+		&StepCommit{},
 		&StepExport{},
 	}
 
@@ -64,8 +65,17 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 		return nil, rawErr.(error)
 	}
 
+	var artifact packer.Artifact
 	// No errors, must've worked
-	artifact := &ExportArtifact{path: b.config.ExportPath}
+	if b.config.Export {
+		artifact = &ExportArtifact{path: b.config.ExportPath}
+	} else {
+		artifact = &ImportArtifact{
+			IdValue:        state.Get("image_id").(string),
+			BuilderIdValue: "packer.post-processor.docker-import",
+			Driver:         driver,
+		}
+	}
 	return artifact, nil
 }
 

builder/docker/config.go

@@ -10,6 +10,7 @@ type Config struct {
 	common.PackerConfig `mapstructure:",squash"`
 
 	ExportPath string `mapstructure:"export_path"`
+	Export     bool
 	Image      string
 	Pull       bool
 	RunCommand []string `mapstructure:"run_command"`
@@ -71,10 +72,7 @@ func NewConfig(raws ...interface{}) (*Config, []string, error) {
 		}
 	}
 
-	if c.ExportPath == "" {
-		errs = packer.MultiErrorAppend(errs,
-			fmt.Errorf("export_path must be specified"))
-	}
+	c.Export = c.ExportPath != ""
 
 	if c.Image == "" {
 		errs = packer.MultiErrorAppend(errs,

builder/docker/config_test.go

@@ -46,13 +46,19 @@ func TestConfigPrepare_exportPath(t *testing.T) {
 
 	// No export path
 	delete(raw, "export_path")
-	_, warns, errs := NewConfig(raw)
-	testConfigErr(t, warns, errs)
+	c, warns, errs := NewConfig(raw)
+	testConfigOk(t, warns, errs)
+	if c.Export {
+		t.Fatal("should not export")
+	}
 
 	// Good export path
 	raw["export_path"] = "good"
-	_, warns, errs = NewConfig(raw)
+	c, warns, errs = NewConfig(raw)
 	testConfigOk(t, warns, errs)
+	if !c.Export {
+		t.Fatal("should export")
+	}
 }
 
 func TestConfigPrepare_image(t *testing.T) {

builder/docker/driver.go

@@ -8,6 +8,9 @@ import (
 // Docker. The Driver interface also allows the steps to be tested since
 // a mock driver can be shimmed in.
 type Driver interface {
+	// Commit the container to a tag
+	Commit(id string) (string, error)
+
 	// Delete an image that is imported into Docker
 	DeleteImage(id string) error
 

builder/docker/driver_docker.go

@@ -35,6 +35,23 @@ func (d *DockerDriver) DeleteImage(id string) error {
 	return nil
 }
 
+func (d *DockerDriver) Commit(id string) (string, error) {
+	var stdout bytes.Buffer
+	cmd := exec.Command("docker", "commit", id)
+	cmd.Stdout = &stdout
+
+	if err := cmd.Start(); err != nil {
+		return "", err
+	}
+
+	if err := cmd.Wait(); err != nil {
+		err = fmt.Errorf("Error committing container: %s", err)
+		return "", err
+	}
+
+	return strings.TrimSpace(stdout.String()), nil
+}
+
 func (d *DockerDriver) Export(id string, dst io.Writer) error {
 	var stderr bytes.Buffer
 	cmd := exec.Command("docker", "export", id)

builder/docker/driver_mock.go

@@ -6,6 +6,11 @@ import (
 
 // MockDriver is a driver implementation that can be used for tests.
 type MockDriver struct {
+	CommitCalled      bool
+	CommitContainerId string
+	CommitImageId     string
+	CommitErr         error
+
 	DeleteImageCalled bool
 	DeleteImageId     string
 	DeleteImageErr    error
@@ -39,6 +44,12 @@ type MockDriver struct {
 	VerifyCalled bool
 }
 
+func (d *MockDriver) Commit(id string) (string, error) {
+	d.CommitCalled = true
+	d.CommitContainerId = id
+	return d.CommitImageId, d.CommitErr
+}
+
 func (d *MockDriver) DeleteImage(id string) error {
 	d.DeleteImageCalled = true
 	d.DeleteImageId = id

builder/docker/step_commit.go

@@ -0,0 +1,40 @@
+package docker
+
+import (
+	"fmt"
+	"github.com/mitchellh/multistep"
+	"github.com/mitchellh/packer/packer"
+)
+
+// StepCommit commits the container to a image.
+type StepCommit struct {
+	imageId string
+}
+
+func (s *StepCommit) Run(state multistep.StateBag) multistep.StepAction {
+	config := state.Get("config").(*Config)
+	driver := state.Get("driver").(Driver)
+	containerId := state.Get("container_id").(string)
+	ui := state.Get("ui").(packer.Ui)
+
+	if config.Export {
+		return multistep.ActionContinue
+	}
+
+	ui.Say("Committing the container")
+	imageId, err := driver.Commit(containerId)
+	if err != nil {
+		state.Put("error", err)
+		ui.Error(err.Error())
+		return multistep.ActionHalt
+	}
+
+	// Save the container ID
+	s.imageId = imageId
+	state.Put("image_id", s.imageId)
+	ui.Message(fmt.Sprintf("Image ID: %s", s.imageId))
+
+	return multistep.ActionContinue
+}
+
+func (s *StepCommit) Cleanup(state multistep.StateBag) {}

builder/docker/step_commit_test.go

@@ -0,0 +1,95 @@
+package docker
+
+import (
+	"errors"
+	"github.com/mitchellh/multistep"
+	"testing"
+)
+
+func testStepCommitState(t *testing.T) multistep.StateBag {
+	state := testState(t)
+	state.Put("container_id", "foo")
+	return state
+}
+
+func TestStepCommit_impl(t *testing.T) {
+	var _ multistep.Step = new(StepCommit)
+}
+
+func TestStepCommit(t *testing.T) {
+	state := testStepCommitState(t)
+	step := new(StepCommit)
+	defer step.Cleanup(state)
+
+	config := state.Get("config").(*Config)
+	config.Export = false
+	driver := state.Get("driver").(*MockDriver)
+	driver.CommitImageId = "bar"
+
+	// run the step
+	if action := step.Run(state); action != multistep.ActionContinue {
+		t.Fatalf("bad action: %#v", action)
+	}
+
+	// verify we did the right thing
+	if !driver.CommitCalled {
+		t.Fatal("should've called")
+	}
+
+	// verify the ID is saved
+	idRaw, ok := state.GetOk("image_id")
+	if !ok {
+		t.Fatal("should've saved ID")
+	}
+
+	id := idRaw.(string)
+	if id != driver.CommitImageId {
+		t.Fatalf("bad: %#v", id)
+	}
+}
+
+func TestStepCommit_skip(t *testing.T) {
+	state := testStepCommitState(t)
+	step := new(StepCommit)
+	defer step.Cleanup(state)
+
+	config := state.Get("config").(*Config)
+	config.Export = true
+	driver := state.Get("driver").(*MockDriver)
+
+	// run the step
+	if action := step.Run(state); action != multistep.ActionContinue {
+		t.Fatalf("bad action: %#v", action)
+	}
+
+	// verify we did the right thing
+	if driver.CommitCalled {
+		t.Fatal("shouldn't have called")
+	}
+
+	// verify the ID is not saved
+	if _, ok := state.GetOk("image_id"); ok {
+		t.Fatal("shouldn't save image ID")
+	}
+}
+
+func TestStepCommit_error(t *testing.T) {
+	state := testStepCommitState(t)
+	step := new(StepCommit)
+	defer step.Cleanup(state)
+
+	config := state.Get("config").(*Config)
+	config.Export = false
+	driver := state.Get("driver").(*MockDriver)
+	driver.CommitErr = errors.New("foo")
+
+	// run the step
+	if action := step.Run(state); action != multistep.ActionHalt {
+		t.Fatalf("bad action: %#v", action)
+	}
+
+	// verify the ID is not saved
+	if _, ok := state.GetOk("image_id"); ok {
+		t.Fatal("shouldn't save image ID")
+	}
+}

builder/docker/step_export.go

@@ -12,6 +12,11 @@ type StepExport struct{}
 
 func (s *StepExport) Run(state multistep.StateBag) multistep.StepAction {
 	config := state.Get("config").(*Config)
+
+	if !config.Export {
+		return multistep.ActionContinue
+	}
+
 	driver := state.Get("driver").(Driver)
 	containerId := state.Get("container_id").(string)
 	ui := state.Get("ui").(packer.Ui)

builder/docker/step_export_test.go

@@ -34,6 +34,7 @@ func TestStepExport(t *testing.T) {
 
 	config := state.Get("config").(*Config)
 	config.ExportPath = tf.Name()
+	config.Export = true
 	driver := state.Get("driver").(*MockDriver)
 	driver.ExportReader = bytes.NewReader([]byte("data!"))
 
@@ -61,6 +62,26 @@ func TestStepExport(t *testing.T) {
 	}
 }
 
+func TestStepExport_skip(t *testing.T) {
+	state := testStepExportState(t)
+	step := new(StepExport)
+	defer step.Cleanup(state)
+
+	config := state.Get("config").(*Config)
+	config.Export = false
+	driver := state.Get("driver").(*MockDriver)
+
+	// run the step
+	if action := step.Run(state); action != multistep.ActionContinue {
+		t.Fatalf("bad action: %#v", action)
+	}
+
+	// verify we did the right thing
+	if driver.ExportCalled {
+		t.Fatal("shouldn't have exported")
+	}
+}
+
 func TestStepExport_error(t *testing.T) {
 	state := testStepExportState(t)
 	step := new(StepExport)
@@ -79,6 +100,7 @@ func TestStepExport_error(t *testing.T) {
 
 	config := state.Get("config").(*Config)
 	config.ExportPath = tf.Name()
+	config.Export = true
 	driver := state.Get("driver").(*MockDriver)
 	driver.ExportError = errors.New("foo")