Merge pull request #7780 from tmeckel/own-vbox-snapshot

VirtualBox Snapshot Builder

builder/virtualbox/common/driver.go

@@ -42,6 +42,7 @@ type Driver interface {
 	SuppressMessages() error
 
 	// VBoxManage executes the given VBoxManage command
+	// and returns the stdout channel as string
 	VBoxManage(...string) error
 
 	// Verify checks to make sure that this driver should function
@@ -51,6 +52,25 @@ type Driver interface {
 
 	// Version reads the version of VirtualBox that is installed.
 	Version() (string, error)
+
+	// LoadSnapshots Loads all defined snapshots for a vm.
+	// if no snapshots are defined nil will be returned
+	LoadSnapshots(string) (*VBoxSnapshot, error)
+
+	// CreateSnapshot Creates a snapshot for a vm with a given name
+	CreateSnapshot(string, string) error
+
+	// HasSnapshots tests if a vm has snapshots
+	HasSnapshots(string) (bool, error)
+
+	// GetCurrentSnapshot Returns the current snapshot for a vm
+	GetCurrentSnapshot(string) (*VBoxSnapshot, error)
+
+	// SetSnapshot sets the for a vm
+	SetSnapshot(string, *VBoxSnapshot) error
+
+	// DeleteSnapshot deletes the specified snapshot from a vm
+	DeleteSnapshot(string, *VBoxSnapshot) error
 }
 
 func NewDriver() (Driver, error) {

builder/virtualbox/common/driver_4_2.go

@@ -177,6 +177,11 @@ func (d *VBox42Driver) SuppressMessages() error {
 }
 
 func (d *VBox42Driver) VBoxManage(args ...string) error {
+	_, err := d.VBoxManageWithOutput(args...)
+	return err
+}
+
+func (d *VBox42Driver) VBoxManageWithOutput(args ...string) (string, error) {
 	var stdout, stderr bytes.Buffer
 
 	log.Printf("Executing VBoxManage: %#v", args)
@@ -204,7 +209,7 @@ func (d *VBox42Driver) VBoxManage(args ...string) error {
 	log.Printf("stdout: %s", stdoutString)
 	log.Printf("stderr: %s", stderrString)
 
-	return err
+	return stdoutString, err
 }
 
 func (d *VBox42Driver) Verify() error {
@@ -239,3 +244,84 @@ func (d *VBox42Driver) Version() (string, error) {
 	log.Printf("VirtualBox version: %s", matches[0][1])
 	return matches[0][1], nil
 }
+
+// LoadSnapshots load the snapshots for a VM instance
+func (d *VBox42Driver) LoadSnapshots(vmName string) (*VBoxSnapshot, error) {
+	if vmName == "" {
+		panic("Argument empty exception: vmName")
+	}
+	log.Printf("Executing LoadSnapshots: VM: %s", vmName)
+
+	stdoutString, err := d.VBoxManageWithOutput("snapshot", vmName, "list", "--machinereadable")
+	if nil != err {
+		return nil, err
+	}
+
+	var rootNode *VBoxSnapshot
+	if stdoutString != "This machine does not have any snapshots" {
+		rootNode, err = ParseSnapshotData(stdoutString)
+		if nil != err {
+			return nil, err
+		}
+	}
+
+	return rootNode, nil
+}
+
+func (d *VBox42Driver) CreateSnapshot(vmname string, snapshotName string) error {
+	if vmname == "" {
+		panic("Argument empty exception: vmname")
+	}
+	log.Printf("Executing CreateSnapshot: VM: %s, SnapshotName %s", vmname, snapshotName)
+
+	return d.VBoxManage("snapshot", vmname, "take", snapshotName)
+}
+
+func (d *VBox42Driver) HasSnapshots(vmname string) (bool, error) {
+	if vmname == "" {
+		panic("Argument empty exception: vmname")
+	}
+	log.Printf("Executing HasSnapshots: VM: %s", vmname)
+
+	sn, err := d.LoadSnapshots(vmname)
+	if nil != err {
+		return false, err
+	}
+	return nil != sn, nil
+}
+
+func (d *VBox42Driver) GetCurrentSnapshot(vmname string) (*VBoxSnapshot, error) {
+	if vmname == "" {
+		panic("Argument empty exception: vmname")
+	}
+	log.Printf("Executing GetCurrentSnapshot: VM: %s", vmname)
+
+	sn, err := d.LoadSnapshots(vmname)
+	if nil != err {
+		return nil, err
+	}
+	return sn.GetCurrentSnapshot(), nil
+}
+
+func (d *VBox42Driver) SetSnapshot(vmname string, sn *VBoxSnapshot) error {
+	if vmname == "" {
+		panic("Argument empty exception: vmname")
+	}
+	if nil == sn {
+		panic("Argument null exception: sn")
+	}
+	log.Printf("Executing SetSnapshot: VM: %s, SnapshotName %s", vmname, sn.UUID)
+
+	return d.VBoxManage("snapshot", vmname, "restore", sn.UUID)
+}
+
+func (d *VBox42Driver) DeleteSnapshot(vmname string, sn *VBoxSnapshot) error {
+	if vmname == "" {
+		panic("Argument empty exception: vmname")
+	}
+	if nil == sn {
+		panic("Argument null exception: sn")
+	}
+	log.Printf("Executing DeleteSnapshot: VM: %s, SnapshotName %s", vmname, sn.UUID)
+	return d.VBoxManage("snapshot", vmname, "delete", sn.UUID)
+}

builder/virtualbox/common/driver_mock.go

@@ -45,6 +45,17 @@ type DriverMock struct {
 	VersionCalled bool
 	VersionResult string
 	VersionErr    error
+
+	LoadSnapshotsCalled      []string
+	LoadSnapshotsResult      *VBoxSnapshot
+	CreateSnapshotCalled     []string
+	CreateSnapshotError      error
+	HasSnapshotsCalled       []string
+	HasSnapshotsResult       bool
+	GetCurrentSnapshotCalled []string
+	GetCurrentSnapshotResult *VBoxSnapshot
+	SetSnapshotCalled        []*VBoxSnapshot
+	DeleteSnapshotCalled     []*VBoxSnapshot
 }
 
 func (d *DriverMock) CreateSATAController(vm string, controller string, portcount int) error {
@@ -114,3 +125,65 @@ func (d *DriverMock) Version() (string, error) {
 	d.VersionCalled = true
 	return d.VersionResult, d.VersionErr
 }
+
+func (d *DriverMock) LoadSnapshots(vmName string) (*VBoxSnapshot, error) {
+	if vmName == "" {
+		panic("Argument empty exception: vmName")
+	}
+
+	d.LoadSnapshotsCalled = append(d.LoadSnapshotsCalled, vmName)
+	return d.LoadSnapshotsResult, nil
+}
+
+func (d *DriverMock) CreateSnapshot(vmName string, snapshotName string) error {
+	if vmName == "" {
+		panic("Argument empty exception: vmName")
+	}
+	if snapshotName == "" {
+		panic("Argument empty exception: snapshotName")
+	}
+
+	d.CreateSnapshotCalled = append(d.CreateSnapshotCalled, snapshotName)
+	return d.CreateSnapshotError
+}
+
+func (d *DriverMock) HasSnapshots(vmName string) (bool, error) {
+	if vmName == "" {
+		panic("Argument empty exception: vmName")
+	}
+
+	d.HasSnapshotsCalled = append(d.HasSnapshotsCalled, vmName)
+	return d.HasSnapshotsResult, nil
+}
+
+func (d *DriverMock) GetCurrentSnapshot(vmName string) (*VBoxSnapshot, error) {
+	if vmName == "" {
+		panic("Argument empty exception: vmName")
+	}
+
+	d.GetCurrentSnapshotCalled = append(d.GetCurrentSnapshotCalled, vmName)
+	return d.GetCurrentSnapshotResult, nil
+}
+
+func (d *DriverMock) SetSnapshot(vmName string, snapshot *VBoxSnapshot) error {
+	if vmName == "" {
+		panic("Argument empty exception: vmName")
+	}
+	if snapshot == nil {
+		panic("Argument empty exception: snapshot")
+	}
+
+	d.SetSnapshotCalled = append(d.SetSnapshotCalled, snapshot)
+	return nil
+}
+
+func (d *DriverMock) DeleteSnapshot(vmName string, snapshot *VBoxSnapshot) error {
+	if vmName == "" {
+		panic("Argument empty exception: vmName")
+	}
+	if snapshot == nil {
+		panic("Argument empty exception: snapshot")
+	}
+	d.DeleteSnapshotCalled = append(d.DeleteSnapshotCalled, snapshot)
+	return nil
+}

builder/virtualbox/common/snapshot.go

@@ -0,0 +1,199 @@
+package common
+
+import (
+	"bufio"
+	"log"
+	"regexp"
+	"strings"
+
+	"github.com/golang-collections/collections/stack"
+)
+
+// VBoxSnapshot stores the hierarchy of snapshots for a VM instance
+type VBoxSnapshot struct {
+	Name      string
+	UUID      string
+	IsCurrent bool
+	Parent    *VBoxSnapshot // nil if topmost (root) snapshot
+	Children  []*VBoxSnapshot
+}
+
+// ParseSnapshotData parses the machinereadable representation of a virtualbox snapshot tree
+func ParseSnapshotData(snapshotData string) (*VBoxSnapshot, error) {
+	scanner := bufio.NewScanner(strings.NewReader(snapshotData))
+	SnapshotNamePartsRe := regexp.MustCompile("Snapshot(?P<Type>Name|UUID)(?P<Path>(-[1-9]+)*)=\"(?P<Value>[^\"]*)\"")
+	var currentIndicator string
+	parentStack := stack.New()
+	var node *VBoxSnapshot
+	var rootNode *VBoxSnapshot
+
+	for scanner.Scan() {
+		txt := scanner.Text()
+		idx := strings.Index(txt, "=")
+		if idx > 0 {
+			if strings.HasPrefix(txt, "Current") {
+				node.IsCurrent = true
+			} else {
+				matches := SnapshotNamePartsRe.FindStringSubmatch(txt)
+				if matches[1] == "Name" {
+					if nil == rootNode {
+						node = new(VBoxSnapshot)
+						rootNode = node
+						currentIndicator = matches[2]
+					} else {
+						pathLenCur := strings.Count(currentIndicator, "-")
+						pathLen := strings.Count(matches[2], "-")
+						if pathLen > pathLenCur {
+							currentIndicator = matches[2]
+							parentStack.Push(node)
+						} else if pathLen < pathLenCur {
+							currentIndicator = matches[2]
+							for i := 0; i < pathLenCur-pathLen; i++ {
+								parentStack.Pop()
+							}
+						}
+						node = new(VBoxSnapshot)
+						parent := parentStack.Peek().(*VBoxSnapshot)
+						if nil != parent {
+							node.Parent = parent
+							parent.Children = append(parent.Children, node)
+						}
+					}
+					node.Name = matches[4]
+				} else if matches[1] == "UUID" {
+					node.UUID = matches[4]
+				}
+			}
+		} else {
+			log.Printf("Invalid key,value pair [%s]", txt)
+		}
+	}
+	return rootNode, nil
+}
+
+// IsChildOf verifies if the current snaphot is a child of the passed as argument
+func (sn *VBoxSnapshot) IsChildOf(candidate *VBoxSnapshot) bool {
+	if nil == candidate {
+		panic("Missing parameter value: candidate")
+	}
+	node := sn
+	for nil != node {
+		if candidate.UUID == node.UUID {
+			break
+		}
+		node = node.Parent
+	}
+	return nil != node
+}
+
+// the walker uses a channel to return nodes from a snapshot tree in breadth approach
+func walk(sn *VBoxSnapshot, ch chan *VBoxSnapshot) {
+	if nil == sn {
+		return
+	}
+	if 0 < len(sn.Children) {
+		for _, child := range sn.Children {
+			walk(child, ch)
+		}
+	}
+	ch <- sn
+}
+
+func walker(sn *VBoxSnapshot) <-chan *VBoxSnapshot {
+	if nil == sn {
+		panic("Argument null exception: sn")
+	}
+
+	ch := make(chan *VBoxSnapshot)
+	go func() {
+		walk(sn, ch)
+		close(ch)
+	}()
+	return ch
+}
+
+// GetRoot returns the top-most (root) snapshot for a given snapshot
+func (sn *VBoxSnapshot) GetRoot() *VBoxSnapshot {
+	if nil == sn {
+		panic("Argument null exception: sn")
+	}
+
+	node := sn
+	for nil != node.Parent {
+		node = node.Parent
+	}
+	return node
+}
+
+// GetSnapshots returns an array of all snapshots defined
+func (sn *VBoxSnapshot) GetSnapshots() []*VBoxSnapshot {
+	var result []*VBoxSnapshot
+	root := sn.GetRoot()
+	ch := walker(root)
+	for {
+		node, ok := <-ch
+		if !ok {
+			break
+		}
+		result = append(result, node)
+	}
+	return result
+}
+
+// GetSnapshotsByName find all snapshots with a given name
+func (sn *VBoxSnapshot) GetSnapshotsByName(name string) []*VBoxSnapshot {
+	var result []*VBoxSnapshot
+	root := sn.GetRoot()
+	ch := walker(root)
+	for {
+		node, ok := <-ch
+		if !ok {
+			break
+		}
+		if strings.EqualFold(node.Name, name) {
+			result = append(result, node)
+		}
+	}
+	return result
+}
+
+// GetSnapshotByUUID returns a snapshot by it's UUID
+func (sn *VBoxSnapshot) GetSnapshotByUUID(uuid string) *VBoxSnapshot {
+	root := sn.GetRoot()
+	ch := walker(root)
+	for {
+		node, ok := <-ch
+		if !ok {
+			break
+		}
+		if strings.EqualFold(node.UUID, uuid) {
+			return node
+		}
+	}
+	return nil
+}
+
+// GetCurrentSnapshot returns the currently attached snapshot
+func (sn *VBoxSnapshot) GetCurrentSnapshot() *VBoxSnapshot {
+	root := sn.GetRoot()
+	ch := walker(root)
+	for {
+		node, ok := <-ch
+		if !ok {
+			break
+		}
+		if node.IsCurrent {
+			return node
+		}
+	}
+	return nil
+}
+
+func (sn *VBoxSnapshot) GetChildWithName(name string) *VBoxSnapshot {
+	for _, child := range sn.Children {
+		if child.Name == name {
+			return child
+		}
+	}
+	return nil
+}

builder/virtualbox/common/snapshot_test.go

@@ -0,0 +1,136 @@
+package common
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func getTestData() string {
+	return `SnapshotName="Imported"
+SnapshotUUID="7e5b4165-91ec-4091-a74c-a5709d584530"
+SnapshotName-1="Snapshot 1"
+SnapshotUUID-1="5fc461ec-da7a-40a8-a168-03134d7cdf5c"
+SnapshotName-1-1="Snapshot 2"
+SnapshotUUID-1-1="8e12833b-c6b5-4cbd-b42b-09eff8ffc173"
+SnapshotName-1-1-1="Snapshot 3"
+SnapshotUUID-1-1-1="eb342b39-b4bd-47b0-afd8-dcd1cc5c5929"
+SnapshotName-1-1-2="Snapshot 4"
+SnapshotUUID-1-1-2="17df1668-e79a-4ed6-a86b-713913699846"
+SnapshotName-1-2="Snapshot-Export"
+SnapshotUUID-1-2="c857d1b8-4fd6-4044-9d2c-c6e465b3cdd4"
+CurrentSnapshotName="Snapshot-Export"
+CurrentSnapshotUUID="c857d1b8-4fd6-4044-9d2c-c6e465b3cdd4"
+CurrentSnapshotNode="SnapshotName-1-2"
+SnapshotName-2="Snapshot 5"
+SnapshotUUID-2="85646c6a-fb86-4112-b15e-cab090670778"
+SnapshotName-2-1="Snapshot 2"
+SnapshotUUID-2-1="7b093686-2981-4ada-8b0f-4c03ae23cd1a"
+SnapshotName-3="Snapshot 7"
+SnapshotUUID-3="0d977a1f-c9ef-412c-a08d-7c0707b3b18f"
+SnapshotName-3-1="Snapshot 8"
+SnapshotUUID-3-1="f4ed75b3-afc1-42d4-9e02-8df6f053d07e"
+SnapshotName-3-2="Snapshot 9"
+SnapshotUUID-3-2="a5903505-9261-4bd3-9972-bacd0064d667"`
+}
+
+func TestSnapshot_ParseFullTree(t *testing.T) {
+	rootNode, err := ParseSnapshotData(getTestData())
+	assert.NoError(t, err)
+	assert.NotNil(t, rootNode)
+	assert.Equal(t, rootNode.Name, "Imported")
+	assert.Equal(t, rootNode.UUID, "7e5b4165-91ec-4091-a74c-a5709d584530")
+	assert.Equal(t, 3, len(rootNode.Children))
+	assert.Nil(t, rootNode.Parent)
+}
+
+func TestSnapshot_FindCurrent(t *testing.T) {
+	rootNode, err := ParseSnapshotData(getTestData())
+	assert.NoError(t, err)
+	assert.NotNil(t, rootNode)
+
+	current := rootNode.GetCurrentSnapshot()
+	assert.NotNil(t, current)
+	assert.Equal(t, current.UUID, "c857d1b8-4fd6-4044-9d2c-c6e465b3cdd4")
+	assert.Equal(t, current.Name, "Snapshot-Export")
+	assert.NotNil(t, current.Parent)
+	assert.Equal(t, current.Parent.UUID, "5fc461ec-da7a-40a8-a168-03134d7cdf5c")
+	assert.Equal(t, current.Parent.Name, "Snapshot 1")
+}
+
+func TestSnapshot_FindNodeByUUID(t *testing.T) {
+	rootNode, err := ParseSnapshotData(getTestData())
+	assert.NoError(t, err)
+	assert.NotNil(t, rootNode)
+
+	node := rootNode.GetSnapshotByUUID("7b093686-2981-4ada-8b0f-4c03ae23cd1a")
+	assert.NotNil(t, node)
+	assert.Equal(t, "Snapshot 2", node.Name)
+	assert.Equal(t, "7b093686-2981-4ada-8b0f-4c03ae23cd1a", node.UUID)
+	assert.Equal(t, 0, len(node.Children))
+	assert.Nil(t, rootNode.Parent)
+
+	otherNode := rootNode.GetSnapshotByUUID("f4ed75b3-afc1-42d4-9e02-8df6f053d07e")
+	assert.NotNil(t, otherNode)
+	assert.True(t, otherNode.IsChildOf(rootNode))
+	assert.False(t, node.IsChildOf(otherNode))
+	assert.False(t, otherNode.IsChildOf(node))
+}
+
+func TestSnapshot_FindNodesByName(t *testing.T) {
+	rootNode, err := ParseSnapshotData(getTestData())
+	assert.NoError(t, err)
+	assert.NotNil(t, rootNode)
+
+	nodes := rootNode.GetSnapshotsByName("Snapshot 2")
+	assert.NotNil(t, nodes)
+	assert.Equal(t, 2, len(nodes))
+}
+
+func TestSnapshot_IsChildOf(t *testing.T) {
+	rootNode, err := ParseSnapshotData(getTestData())
+	assert.NoError(t, err)
+	assert.NotNil(t, rootNode)
+
+	child := rootNode.GetSnapshotByUUID("c857d1b8-4fd6-4044-9d2c-c6e465b3cdd4")
+	assert.NotNil(t, child)
+	assert.True(t, child.IsChildOf(rootNode))
+	assert.True(t, child.IsChildOf(child.Parent))
+	assert.PanicsWithValue(t, "Missing parameter value: candidate", func() { child.IsChildOf(nil) })
+}
+
+func TestSnapshot_SingleSnapshot(t *testing.T) {
+	snapData := `SnapshotName="Imported"
+	SnapshotUUID="7e5b4165-91ec-4091-a74c-a5709d584530"`
+
+	rootNode, err := ParseSnapshotData(snapData)
+	assert.NoError(t, err)
+	assert.NotNil(t, rootNode)
+
+	assert.Equal(t, rootNode.Name, "Imported")
+	assert.Equal(t, rootNode.UUID, "7e5b4165-91ec-4091-a74c-a5709d584530")
+	assert.Equal(t, len(rootNode.Children), 0)
+	assert.Nil(t, rootNode.Parent)
+}
+
+func TestSnapshot_EmptySnapshotData(t *testing.T) {
+	snapData := ``
+
+	rootNode, err := ParseSnapshotData(snapData)
+	assert.NoError(t, err)
+	assert.Nil(t, rootNode)
+}
+
+func TestSnapshot_EnsureParents(t *testing.T) {
+	rootNode, err := ParseSnapshotData(getTestData())
+	assert.NoError(t, err)
+	assert.NotNil(t, rootNode)
+
+	for _, snapshot := range rootNode.GetSnapshots() {
+		if snapshot == rootNode {
+			assert.Nil(t, snapshot.Parent)
+		} else {
+			assert.NotNil(t, snapshot.Parent)
+		}
+	}
+}

builder/virtualbox/common/step_forward_ssh.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"log"
+	"strings"
 
 	"github.com/hashicorp/packer/common/net"
 	"github.com/hashicorp/packer/helper/communicator"
@@ -69,11 +70,29 @@ func (s *StepForwardSSH) Run(ctx context.Context, state multistep.StateBag) mult
 			"--natpf1",
 			fmt.Sprintf("packercomm,tcp,127.0.0.1,%d,,%d", sshHostPort, guestPort),
 		}
+		retried := false
+	retry:
 		if err := driver.VBoxManage(command...); err != nil {
+			if !strings.Contains(err.Error(), "A NAT rule of this name already exists") || retried {
 				err := fmt.Errorf("Error creating port forwarding rule: %s", err)
 				state.Put("error", err)
 				ui.Error(err.Error())
 				return multistep.ActionHalt
+			} else {
+				log.Printf("A packer NAT rule already exists. Trying to delete ...")
+				delcommand := []string{
+					"modifyvm", vmName,
+					"--natpf1",
+					"delete", "packercomm",
+				}
+				if err := driver.VBoxManage(delcommand...); err != nil {
+					err := fmt.Errorf("Error deleting packer NAT forwarding rule: %s", err)
+					state.Put("error", err)
+					ui.Error(err.Error())
+					return multistep.ActionHalt
+				}
+				goto retry
+			}
 		}
 	}
 

builder/virtualbox/common/step_shutdown.go

@@ -45,6 +45,16 @@ func (s *StepShutdown) Run(ctx context.Context, state multistep.StateBag) multis
 			return multistep.ActionHalt
 		}
 
+	} else {
+		ui.Say("Halting the virtual machine...")
+		if err := driver.Stop(vmName); err != nil {
+			err := fmt.Errorf("Error stopping VM: %s", err)
+			state.Put("error", err)
+			ui.Error(err.Error())
+			return multistep.ActionHalt
+		}
+	}
+
 	// Wait for the machine to actually shut down
 	log.Printf("Waiting max %s for shutdown to complete", s.Timeout)
 	shutdownTimer := time.After(s.Timeout)
@@ -70,15 +80,6 @@ func (s *StepShutdown) Run(ctx context.Context, state multistep.StateBag) multis
 			time.Sleep(500 * time.Millisecond)
 		}
 	}
-	} else {
-		ui.Say("Halting the virtual machine...")
-		if err := driver.Stop(vmName); err != nil {
-			err := fmt.Errorf("Error stopping VM: %s", err)
-			state.Put("error", err)
-			ui.Error(err.Error())
-			return multistep.ActionHalt
-		}
-	}
 
 	log.Println("VM shut down.")
 	return multistep.ActionContinue

builder/virtualbox/vm/builder.go

@@ -0,0 +1,178 @@
+package vm
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	vboxcommon "github.com/hashicorp/packer/builder/virtualbox/common"
+	"github.com/hashicorp/packer/common"
+	"github.com/hashicorp/packer/helper/communicator"
+	"github.com/hashicorp/packer/helper/multistep"
+	"github.com/hashicorp/packer/packer"
+)
+
+// Builder implements packer.Builder and builds the actual VirtualBox
+// images.
+type Builder struct {
+	config *Config
+	runner multistep.Runner
+}
+
+// Prepare processes the build configuration parameters.
+func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
+	c, warnings, errs := NewConfig(raws...)
+	if errs != nil {
+		return warnings, errs
+	}
+	b.config = c
+
+	return warnings, nil
+}
+
+// Run executes a Packer build and returns a packer.Artifact representing
+// a VirtualBox appliance.
+func (b *Builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (packer.Artifact, error) {
+	// Create the driver that we'll use to communicate with VirtualBox
+	driver, err := vboxcommon.NewDriver()
+	if err != nil {
+		return nil, fmt.Errorf("Failed creating VirtualBox driver: %s", err)
+	}
+
+	// Set up the state.
+	state := new(multistep.BasicStateBag)
+	state.Put("config", b.config)
+	state.Put("debug", b.config.PackerDebug)
+	state.Put("driver", driver)
+	state.Put("hook", hook)
+	state.Put("ui", ui)
+
+	// Build the steps.
+	steps := []multistep.Step{
+		new(vboxcommon.StepSuppressMessages),
+		&common.StepCreateFloppy{
+			Files:       b.config.FloppyConfig.FloppyFiles,
+			Directories: b.config.FloppyConfig.FloppyDirectories,
+		},
+		&StepSetSnapshot{
+			Name:           b.config.VMName,
+			AttachSnapshot: b.config.AttachSnapshot,
+			KeepRegistered: b.config.KeepRegistered,
+		},
+		&common.StepHTTPServer{
+			HTTPDir:     b.config.HTTPDir,
+			HTTPPortMin: b.config.HTTPPortMin,
+			HTTPPortMax: b.config.HTTPPortMax,
+		},
+		&vboxcommon.StepDownloadGuestAdditions{
+			GuestAdditionsMode:   b.config.GuestAdditionsMode,
+			GuestAdditionsURL:    b.config.GuestAdditionsURL,
+			GuestAdditionsSHA256: b.config.GuestAdditionsSHA256,
+			Ctx:                  b.config.ctx,
+		},
+		&StepImport{
+			Name: b.config.VMName,
+		},
+		&vboxcommon.StepAttachGuestAdditions{
+			GuestAdditionsMode: b.config.GuestAdditionsMode,
+		},
+		&vboxcommon.StepConfigureVRDP{
+			VRDPBindAddress: b.config.VRDPBindAddress,
+			VRDPPortMin:     b.config.VRDPPortMin,
+			VRDPPortMax:     b.config.VRDPPortMax,
+		},
+		new(vboxcommon.StepAttachFloppy),
+		&vboxcommon.StepForwardSSH{
+			CommConfig:     &b.config.SSHConfig.Comm,
+			HostPortMin:    b.config.SSHHostPortMin,
+			HostPortMax:    b.config.SSHHostPortMax,
+			SkipNatMapping: b.config.SSHSkipNatMapping,
+		},
+		&vboxcommon.StepVBoxManage{
+			Commands: b.config.VBoxManage,
+			Ctx:      b.config.ctx,
+		},
+		&vboxcommon.StepRun{
+			Headless: b.config.Headless,
+		},
+		&vboxcommon.StepTypeBootCommand{
+			BootWait:      b.config.BootWait,
+			BootCommand:   b.config.FlatBootCommand(),
+			VMName:        b.config.VMName,
+			Ctx:           b.config.ctx,
+			GroupInterval: b.config.BootConfig.BootGroupInterval,
+			Comm:          &b.config.Comm,
+		},
+		&communicator.StepConnect{
+			Config:    &b.config.SSHConfig.Comm,
+			Host:      vboxcommon.CommHost(b.config.SSHConfig.Comm.SSHHost),
+			SSHConfig: b.config.SSHConfig.Comm.SSHConfigFunc(),
+			SSHPort:   vboxcommon.SSHPort,
+			WinRMPort: vboxcommon.SSHPort,
+		},
+		&vboxcommon.StepUploadVersion{
+			Path: *b.config.VBoxVersionFile,
+		},
+		&vboxcommon.StepUploadGuestAdditions{
+			GuestAdditionsMode: b.config.GuestAdditionsMode,
+			GuestAdditionsPath: b.config.GuestAdditionsPath,
+			Ctx:                b.config.ctx,
+		},
+		new(common.StepProvision),
+		&common.StepCleanupTempKeys{
+			Comm: &b.config.SSHConfig.Comm,
+		},
+		&vboxcommon.StepShutdown{
+			Command: b.config.ShutdownCommand,
+			Timeout: b.config.ShutdownTimeout,
+			Delay:   b.config.PostShutdownDelay,
+		},
+		&vboxcommon.StepVBoxManage{
+			Commands: b.config.VBoxManagePost,
+			Ctx:      b.config.ctx,
+		},
+		&StepCreateSnapshot{
+			Name:           b.config.VMName,
+			TargetSnapshot: b.config.TargetSnapshot,
+		},
+		&vboxcommon.StepExport{
+			Format:         b.config.Format,
+			OutputDir:      b.config.OutputDir,
+			ExportOpts:     b.config.ExportOpts.ExportOpts,
+			SkipNatMapping: b.config.SSHSkipNatMapping,
+			SkipExport:     b.config.SkipExport,
+		},
+	}
+
+	if !b.config.SkipExport {
+		steps = append(steps, nil)
+		copy(steps[1:], steps)
+		steps[0] = &common.StepOutputDir{
+			Force: b.config.PackerForce,
+			Path:  b.config.OutputDir,
+		}
+	}
+	// Run the steps.
+	b.runner = common.NewRunnerWithPauseFn(steps, b.config.PackerConfig, ui, state)
+	b.runner.Run(ctx, state)
+
+	// Report any errors.
+	if rawErr, ok := state.GetOk("error"); ok {
+		return nil, rawErr.(error)
+	}
+
+	// If we were interrupted or cancelled, then just exit.
+	if _, ok := state.GetOk(multistep.StateCancelled); ok {
+		return nil, errors.New("Build was cancelled.")
+	}
+
+	if _, ok := state.GetOk(multistep.StateHalted); ok {
+		return nil, errors.New("Build was halted.")
+	}
+
+	if b.config.SkipExport {
+		return nil, nil
+	} else {
+		return vboxcommon.NewArtifact(b.config.OutputDir)
+	}
+}

builder/virtualbox/vm/config.go

@@ -0,0 +1,209 @@
+package vm
+
+import (
+	"fmt"
+	"log"
+	"strings"
+
+	vboxcommon "github.com/hashicorp/packer/builder/virtualbox/common"
+	"github.com/hashicorp/packer/common"
+	"github.com/hashicorp/packer/common/bootcommand"
+	"github.com/hashicorp/packer/helper/config"
+	"github.com/hashicorp/packer/packer"
+	"github.com/hashicorp/packer/template/interpolate"
+)
+
+// Config is the configuration structure for the builder.
+type Config struct {
+	common.PackerConfig             `mapstructure:",squash"`
+	common.HTTPConfig               `mapstructure:",squash"`
+	common.FloppyConfig             `mapstructure:",squash"`
+	bootcommand.BootConfig          `mapstructure:",squash"`
+	vboxcommon.ExportConfig         `mapstructure:",squash"`
+	vboxcommon.ExportOpts           `mapstructure:",squash"`
+	vboxcommon.OutputConfig         `mapstructure:",squash"`
+	vboxcommon.RunConfig            `mapstructure:",squash"`
+	vboxcommon.SSHConfig            `mapstructure:",squash"`
+	vboxcommon.ShutdownConfig       `mapstructure:",squash"`
+	vboxcommon.VBoxManageConfig     `mapstructure:",squash"`
+	vboxcommon.VBoxManagePostConfig `mapstructure:",squash"`
+	vboxcommon.VBoxVersionConfig    `mapstructure:",squash"`
+
+	GuestAdditionsMode   string `mapstructure:"guest_additions_mode"`
+	GuestAdditionsPath   string `mapstructure:"guest_additions_path"`
+	GuestAdditionsSHA256 string `mapstructure:"guest_additions_sha256"`
+	GuestAdditionsURL    string `mapstructure:"guest_additions_url"`
+	VMName               string `mapstructure:"vm_name"`
+	AttachSnapshot       string `mapstructure:"attach_snapshot"`
+	TargetSnapshot       string `mapstructure:"target_snapshot"`
+	DeleteTargetSnapshot bool   `mapstructure:"force_delete_snapshot"`
+	KeepRegistered       bool   `mapstructure:"keep_registered"`
+	SkipExport           bool   `mapstructure:"skip_export"`
+
+	ctx interpolate.Context
+}
+
+func NewConfig(raws ...interface{}) (*Config, []string, error) {
+	c := new(Config)
+	err := config.Decode(c, &config.DecodeOpts{
+		Interpolate:        true,
+		InterpolateContext: &c.ctx,
+		InterpolateFilter: &interpolate.RenderFilter{
+			Exclude: []string{
+				"boot_command",
+				"guest_additions_path",
+				"guest_additions_url",
+				"vboxmanage",
+				"vboxmanage_post",
+			},
+		},
+	}, raws...)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// Defaults
+	if c.GuestAdditionsMode == "" {
+		c.GuestAdditionsMode = "upload"
+	}
+
+	if c.GuestAdditionsPath == "" {
+		c.GuestAdditionsPath = "VBoxGuestAdditions.iso"
+	}
+
+	if c.RawPostShutdownDelay == "" {
+		c.RawPostShutdownDelay = "2s"
+	}
+
+	// Prepare the errors
+	var errs *packer.MultiError
+	errs = packer.MultiErrorAppend(errs, c.ExportConfig.Prepare(&c.ctx)...)
+	errs = packer.MultiErrorAppend(errs, c.ExportOpts.Prepare(&c.ctx)...)
+	errs = packer.MultiErrorAppend(errs, c.FloppyConfig.Prepare(&c.ctx)...)
+	errs = packer.MultiErrorAppend(errs, c.HTTPConfig.Prepare(&c.ctx)...)
+	errs = packer.MultiErrorAppend(errs, c.OutputConfig.Prepare(&c.ctx, &c.PackerConfig)...)
+	errs = packer.MultiErrorAppend(errs, c.RunConfig.Prepare(&c.ctx)...)
+	errs = packer.MultiErrorAppend(errs, c.ShutdownConfig.Prepare(&c.ctx)...)
+	errs = packer.MultiErrorAppend(errs, c.SSHConfig.Prepare(&c.ctx)...)
+	errs = packer.MultiErrorAppend(errs, c.VBoxManageConfig.Prepare(&c.ctx)...)
+	errs = packer.MultiErrorAppend(errs, c.VBoxManagePostConfig.Prepare(&c.ctx)...)
+	errs = packer.MultiErrorAppend(errs, c.VBoxVersionConfig.Prepare(&c.ctx)...)
+	errs = packer.MultiErrorAppend(errs, c.BootConfig.Prepare(&c.ctx)...)
+
+	log.Printf("PostShutdownDelay: %f", c.PostShutdownDelay.Seconds())
+
+	if c.VMName == "" {
+		errs = packer.MultiErrorAppend(errs,
+			fmt.Errorf("vm_name is required"))
+	}
+
+	if c.TargetSnapshot == "" {
+		errs = packer.MultiErrorAppend(errs,
+			fmt.Errorf("target_snapshot is required"))
+	}
+
+	validMode := false
+	validModes := []string{
+		vboxcommon.GuestAdditionsModeDisable,
+		vboxcommon.GuestAdditionsModeAttach,
+		vboxcommon.GuestAdditionsModeUpload,
+	}
+
+	for _, mode := range validModes {
+		if c.GuestAdditionsMode == mode {
+			validMode = true
+			break
+		}
+	}
+
+	if !validMode {
+		errs = packer.MultiErrorAppend(errs,
+			fmt.Errorf("guest_additions_mode is invalid. Must be one of: %v", validModes))
+	}
+
+	if c.GuestAdditionsSHA256 != "" {
+		c.GuestAdditionsSHA256 = strings.ToLower(c.GuestAdditionsSHA256)
+	}
+
+	// Warnings
+	var warnings []string
+	if c.ShutdownCommand == "" {
+		warnings = append(warnings,
+			"A shutdown_command was not specified. Without a shutdown command, Packer\n"+
+				"will forcibly halt the virtual machine, which may result in data loss.")
+	}
+	driver, err := vboxcommon.NewDriver()
+	if err != nil {
+		errs = packer.MultiErrorAppend(errs, fmt.Errorf("Failed creating VirtualBox driver: %s", err))
+	} else {
+		if c.AttachSnapshot != "" && c.TargetSnapshot != "" && c.AttachSnapshot == c.TargetSnapshot {
+			errs = packer.MultiErrorAppend(errs, fmt.Errorf("Attach snapshot %s and target snapshot %s cannot be the same", c.AttachSnapshot, c.TargetSnapshot))
+		}
+		snapshotTree, err := driver.LoadSnapshots(c.VMName)
+		log.Printf("")
+		if err != nil {
+			errs = packer.MultiErrorAppend(errs, fmt.Errorf("Failed to load snapshots for VM %s: %s", c.VMName, err))
+		} else {
+			log.Printf("Snapshots loaded from VM %s", c.VMName)
+
+			var attachSnapshot *vboxcommon.VBoxSnapshot
+			if nil != snapshotTree {
+				attachSnapshot = snapshotTree.GetCurrentSnapshot()
+				log.Printf("VM %s is currently attached to snapshot: %s/%s", c.VMName, attachSnapshot.Name, attachSnapshot.UUID)
+			}
+			if c.AttachSnapshot != "" {
+				log.Printf("Checking configuration attach_snapshot [%s]", c.AttachSnapshot)
+				if nil == snapshotTree {
+					errs = packer.MultiErrorAppend(errs, fmt.Errorf("No snapshots defined on VM %s. Unable to attach to %s", c.VMName, c.AttachSnapshot))
+				} else {
+					snapshots := snapshotTree.GetSnapshotsByName(c.AttachSnapshot)
+					if 0 >= len(snapshots) {
+						errs = packer.MultiErrorAppend(errs, fmt.Errorf("Snapshot %s does not exist on VM %s", c.AttachSnapshot, c.VMName))
+					} else if 1 < len(snapshots) {
+						errs = packer.MultiErrorAppend(errs, fmt.Errorf("Multiple Snapshots with name %s exist on VM %s", c.AttachSnapshot, c.VMName))
+					} else {
+						attachSnapshot = snapshots[0]
+					}
+				}
+			}
+			if c.TargetSnapshot != "" {
+				log.Printf("Checking configuration target_snapshot [%s]", c.TargetSnapshot)
+				if nil == snapshotTree {
+					log.Printf("Currently no snapshots defined in VM %s", c.VMName)
+				} else {
+					if c.TargetSnapshot == attachSnapshot.Name {
+						errs = packer.MultiErrorAppend(errs, fmt.Errorf("Target snapshot %s cannot be the same as the snapshot to which the builder shall attach: %s", c.TargetSnapshot, attachSnapshot.Name))
+					} else {
+						snapshots := snapshotTree.GetSnapshotsByName(c.TargetSnapshot)
+						if 0 < len(snapshots) {
+							if nil == attachSnapshot {
+								panic("Internal error. Expecting a handle to a VBoxSnapshot")
+							}
+							isChild := false
+							for _, snapshot := range snapshots {
+								log.Printf("Checking if target snaphot %s/%s is child of %s/%s", snapshot.Name, snapshot.UUID, attachSnapshot.Name, attachSnapshot.UUID)
+								isChild = nil != snapshot.Parent && snapshot.Parent.UUID == attachSnapshot.UUID
+							}
+							if !isChild {
+								errs = packer.MultiErrorAppend(errs, fmt.Errorf("Target snapshot %s already exists and is not a direct child of %s", c.TargetSnapshot, attachSnapshot.Name))
+							} else if !c.DeleteTargetSnapshot {
+								errs = packer.MultiErrorAppend(errs, fmt.Errorf("Target snapshot %s already exists as direct child of %s for VM %s. Use force_delete_snapshot = true to overwrite snapshot",
+									c.TargetSnapshot,
+									attachSnapshot.Name,
+									c.VMName))
+							}
+						} else {
+							log.Printf("No snapshot with name %s defined in VM %s", c.TargetSnapshot, c.VMName)
+						}
+					}
+				}
+			}
+		}
+	}
+	// Check for any errors.
+	if errs != nil && len(errs.Errors) > 0 {
+		return nil, warnings, errs
+	}
+
+	return c, warnings, nil
+}

builder/virtualbox/vm/step_create_snapshot.go

@@ -0,0 +1,69 @@
+package vm
+
+import (
+	"context"
+	"fmt"
+	"log"
+
+	vboxcommon "github.com/hashicorp/packer/builder/virtualbox/common"
+	"github.com/hashicorp/packer/helper/multistep"
+	"github.com/hashicorp/packer/packer"
+)
+
+type StepCreateSnapshot struct {
+	Name           string
+	TargetSnapshot string
+}
+
+func (s *StepCreateSnapshot) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
+	driver := state.Get("driver").(vboxcommon.Driver)
+	ui := state.Get("ui").(packer.Ui)
+	if s.TargetSnapshot != "" {
+		running, err := driver.IsRunning(s.Name)
+		if err != nil {
+			err = fmt.Errorf("Failed to test if VM %s is still running: %s", s.Name, err)
+		} else if running {
+			err = fmt.Errorf("VM %s is still running. Unable to create snapshot %s", s.Name, s.TargetSnapshot)
+		}
+		if err != nil {
+			state.Put("error", err)
+			ui.Error(err.Error())
+			return multistep.ActionHalt
+		}
+
+		ui.Say(fmt.Sprintf("Creating snapshot %s on virtual machine %s", s.TargetSnapshot, s.Name))
+		snapshotTree, err := driver.LoadSnapshots(s.Name)
+		if err != nil {
+			err = fmt.Errorf("Failed to load snapshots for VM %s: %s", s.Name, err)
+			state.Put("error", err)
+			ui.Error(err.Error())
+			return multistep.ActionHalt
+		}
+
+		currentSnapshot := snapshotTree.GetCurrentSnapshot()
+		targetSnapshot := currentSnapshot.GetChildWithName(s.TargetSnapshot)
+		if nil != targetSnapshot {
+			log.Printf("Deleting existing target snapshot %s", s.TargetSnapshot)
+			err = driver.DeleteSnapshot(s.Name, targetSnapshot)
+			if nil != err {
+				err = fmt.Errorf("Unable to delete snapshot %s from VM %s: %s", s.TargetSnapshot, s.Name, err)
+				state.Put("error", err)
+				ui.Error(err.Error())
+				return multistep.ActionHalt
+			}
+		}
+		err = driver.CreateSnapshot(s.Name, s.TargetSnapshot)
+		if err != nil {
+			err := fmt.Errorf("Error creating snaphot VM: %s", err)
+			state.Put("error", err)
+			ui.Error(err.Error())
+			return multistep.ActionHalt
+		}
+	} else {
+		ui.Say("No target snapshot defined...")
+	}
+
+	return multistep.ActionContinue
+}
+
+func (s *StepCreateSnapshot) Cleanup(state multistep.StateBag) {}

builder/virtualbox/vm/step_import.go

@@ -0,0 +1,20 @@
+package vm
+
+import (
+	"context"
+
+	"github.com/hashicorp/packer/helper/multistep"
+)
+
+// This step imports an OVF VM into VirtualBox.
+type StepImport struct {
+	Name string
+}
+
+func (s *StepImport) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
+	state.Put("vmName", s.Name)
+	return multistep.ActionContinue
+}
+
+func (s *StepImport) Cleanup(state multistep.StateBag) {
+}

builder/virtualbox/vm/step_set_snapshot.go

@@ -0,0 +1,90 @@
+package vm
+
+import (
+	"context"
+	"fmt"
+
+	vboxcommon "github.com/hashicorp/packer/builder/virtualbox/common"
+	"github.com/hashicorp/packer/helper/multistep"
+	"github.com/hashicorp/packer/packer"
+)
+
+type StepSetSnapshot struct {
+	Name             string
+	AttachSnapshot   string
+	KeepRegistered   bool
+	revertToSnapshot string
+}
+
+func (s *StepSetSnapshot) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
+	driver := state.Get("driver").(vboxcommon.Driver)
+	ui := state.Get("ui").(packer.Ui)
+	snapshotTree, err := driver.LoadSnapshots(s.Name)
+	if err != nil {
+		err := fmt.Errorf("Error loading snapshots for VM: %s", err)
+		state.Put("error", err)
+		ui.Error(err.Error())
+		return multistep.ActionHalt
+	}
+
+	if s.AttachSnapshot != "" {
+		if nil == snapshotTree {
+			err := fmt.Errorf("Unable to attach snapshot on VM %s when no snapshots exist", s.Name)
+			state.Put("error", err)
+			ui.Error(err.Error())
+			return multistep.ActionHalt
+		}
+		currentSnapshot := snapshotTree.GetCurrentSnapshot()
+		s.revertToSnapshot = currentSnapshot.UUID
+		ui.Say(fmt.Sprintf("Attaching snapshot %s on virtual machine %s", s.AttachSnapshot, s.Name))
+		candidateSnapshots := snapshotTree.GetSnapshotsByName(s.AttachSnapshot)
+		if 0 >= len(candidateSnapshots) {
+			err := fmt.Errorf("Snapshot %s not found on VM %s", s.AttachSnapshot, s.Name)
+			state.Put("error", err)
+			ui.Error(err.Error())
+			return multistep.ActionHalt
+		} else if 1 > len(candidateSnapshots) {
+			err := fmt.Errorf("More than one Snapshot %s found on VM %s", s.AttachSnapshot, s.Name)
+			state.Put("error", err)
+			ui.Error(err.Error())
+			return multistep.ActionHalt
+		} else {
+			err = driver.SetSnapshot(s.Name, candidateSnapshots[0])
+			if err != nil {
+				err := fmt.Errorf("Unable to set snapshot for VM: %s", err)
+				state.Put("error", err)
+				ui.Error(err.Error())
+				return multistep.ActionHalt
+			}
+		}
+	}
+	return multistep.ActionContinue
+}
+
+func (s *StepSetSnapshot) Cleanup(state multistep.StateBag) {
+	driver := state.Get("driver").(vboxcommon.Driver)
+	if s.revertToSnapshot != "" {
+		ui := state.Get("ui").(packer.Ui)
+		if s.KeepRegistered {
+			ui.Say("Keeping virtual machine state (keep_registered = true)")
+			return
+		} else {
+			ui.Say(fmt.Sprintf("Reverting to snapshot %s on virtual machine %s", s.revertToSnapshot, s.Name))
+			snapshotTree, err := driver.LoadSnapshots(s.Name)
+			revertTo := snapshotTree.GetSnapshotByUUID(s.revertToSnapshot)
+			if nil == revertTo {
+				err := fmt.Errorf("Snapshot with UUID %s not found for VM %s", s.revertToSnapshot, s.Name)
+				state.Put("error", err)
+				ui.Error(err.Error())
+				return
+			}
+			err = driver.SetSnapshot(s.Name, revertTo)
+			if err != nil {
+				err := fmt.Errorf("Unable to set snapshot for VM: %s", err)
+				state.Put("error", err)
+				ui.Error(err.Error())
+				return
+			}
+		}
+	}
+}

command/build.go

@@ -241,10 +241,12 @@ func (c *BuildCommand) RunContext(buildCtx context.Context, args []string) int {
 				errors.Unlock()
 			} else {
 				ui.Say(fmt.Sprintf("Build '%s' finished.", name))
+				if nil != runArtifacts {
 					artifacts.Lock()
 					artifacts.m[name] = runArtifacts
 					artifacts.Unlock()
 				}
+			}
 		}()
 
 		if cfg.Debug {

command/plugin.go

@@ -54,6 +54,7 @@ import (
 	vagrantbuilder "github.com/hashicorp/packer/builder/vagrant"
 	virtualboxisobuilder "github.com/hashicorp/packer/builder/virtualbox/iso"
 	virtualboxovfbuilder "github.com/hashicorp/packer/builder/virtualbox/ovf"
+	virtualboxvmbuilder "github.com/hashicorp/packer/builder/virtualbox/vm"
 	vmwareisobuilder "github.com/hashicorp/packer/builder/vmware/iso"
 	vmwarevmxbuilder "github.com/hashicorp/packer/builder/vmware/vmx"
 	yandexbuilder "github.com/hashicorp/packer/builder/yandex"
@@ -141,6 +142,7 @@ var Builders = map[string]packer.Builder{
 	"vagrant":             new(vagrantbuilder.Builder),
 	"virtualbox-iso":      new(virtualboxisobuilder.Builder),
 	"virtualbox-ovf":      new(virtualboxovfbuilder.Builder),
+	"virtualbox-vm":       new(virtualboxvmbuilder.Builder),
 	"vmware-iso":          new(vmwareisobuilder.Builder),
 	"vmware-vmx":          new(vmwarevmxbuilder.Builder),
 	"yandex":              new(yandexbuilder.Builder),

go.mod

@@ -37,6 +37,7 @@ require (
 	github.com/go-ini/ini v1.25.4
 	github.com/gofrs/flock v0.7.1
 	github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db // indirect
+	github.com/golang-collections/collections v0.0.0-20130729185459-604e922904d3
 	github.com/google/go-cmp v0.2.0
 	github.com/google/shlex v0.0.0-20150127133951-6f45313302b9
 	github.com/google/uuid v1.0.0

go.sum

@@ -111,7 +111,9 @@ github.com/gofrs/flock v0.7.1 h1:DP+LD/t0njgoPBvT5MJLeliUIVQR03hiKR6vezdwHlc=
 github.com/gofrs/flock v0.7.1/go.mod h1:F1TvTiK9OcQqauNUHlbJvyl9Qa1QvF/gOUDKA14jxHU=
 github.com/gofrs/uuid v3.2.0+incompatible h1:y12jRkkFxsd7GpqdSZ+/KCs/fJbqpEXSGd4+jfEaewE=
 github.com/gofrs/uuid v3.2.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
-github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
+github.com/gogo/protobuf v1.2.0/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
+github.com/golang-collections/collections v0.0.0-20130729185459-604e922904d3 h1:zN2lZNZRflqFyxVaTIU61KNKQ9C0055u9CAfpmqUvo4=
+github.com/golang-collections/collections v0.0.0-20130729185459-604e922904d3/go.mod h1:nPpo7qLxd6XL3hWJG/O60sR8ZKfMCiIoNap5GvD12KU=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:tluoj9z5200jBnyusfRPU2LqT6J+DAorxEvtC7LHB+E=

vendor/github.com/golang-collections/collections/LICENSE

@@ -0,0 +1,20 @@
+Copyright (c) 2012 Caleb Doxsey
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/golang-collections/collections/stack/stack.go

@@ -0,0 +1,44 @@
+package stack
+
+type (
+	Stack struct {
+		top *node
+		length int
+	}
+	node struct {
+		value interface{}
+		prev *node
+	}	
+)
+// Create a new stack
+func New() *Stack {
+	return &Stack{nil,0}
+}
+// Return the number of items in the stack
+func (this *Stack) Len() int {
+	return this.length
+}
+// View the top item on the stack
+func (this *Stack) Peek() interface{} {
+	if this.length == 0 {
+		return nil
+	}
+	return this.top.value
+}
+// Pop the top item of the stack and return it
+func (this *Stack) Pop() interface{} {
+	if this.length == 0 {
+		return nil
+	}
+	
+	n := this.top
+	this.top = n.prev
+	this.length--
+	return n.value
+}
+// Push a value onto the top of the stack
+func (this *Stack) Push(value interface{}) {
+	n := &node{value,this.top}
+	this.top = n
+	this.length++
+}

vendor/modules.txt

@@ -177,6 +177,8 @@ github.com/go-ini/ini
 github.com/gofrs/flock
 # github.com/gofrs/uuid v3.2.0+incompatible
 github.com/gofrs/uuid
+# github.com/golang-collections/collections v0.0.0-20130729185459-604e922904d3
+github.com/golang-collections/collections/stack
 # github.com/golang/protobuf v1.3.1
 github.com/golang/protobuf/proto
 github.com/golang/protobuf/ptypes/timestamp

website/source/docs/builders/virtualbox-vm.html.md.erb

@@ -0,0 +1,395 @@
+---
+modeline: |
+  vim: set ft=pandoc:
+description: |
+    The VirtualBox Packer builder is able to create VirtualBox virtual machines snapshots
+    and export them in the OVF format, starting from an ISO image.
+layout: docs
+page_title: 'VirtualBox Snapshot - Builders'
+sidebar_current: 'docs-builders-virtualbox-vm'
+---
+
+# VirtualBox Builder (from an existing VM)
+
+Type: `virtualbox-vm`
+
+The VirtualBox Packer builder is able to create
+[VirtualBox](https://www.virtualbox.org/) virtual machines snapshots and
+(optionally) export them in the OVF format, starting from an **existing**
+virtual machine.
+
+The builder builds a virtual machine snapshot by using an existing virtual
+machine, booting it, provisioning software within the OS, then shutting it down.
+The result of the VirtualBox builder is a new snapshot persisting all changes
+from the applied provisioners.
+
+## Basic Example
+
+Here is a basic example. which serves to show the basic configuration:
+
+``` json
+{
+  "type"                  : "virtualbox-vm",
+  "communicator"          : "winrm",
+  "headless"              : "{{user `headless`}}",
+  "winrm_username"        : "vagrant",
+  "winrm_password"        : "vagrant",
+  "winrm_timeout"         : "2h",
+  "shutdown_command"      : "shutdown /s /t 10 /f /d p:4:1 /c \"Packer Shutdown\"",
+  "guest_additions_mode"  : "disable",
+  "output_directory"      : "./builds-vm",
+  "vm_name"               : "target-vm",
+  "attach_snapshot"       : "Snapshot",
+  "target_snapshot"       : "Target-Snapshot",
+  "force_delete_snapshot" : "true",
+  "keep_registered"       : "false",
+  "skip_export"           : "false"
+}
+```
+
+It is important to add a `shutdown_command`. By default Packer halts the virtual
+machine and the file system may not be sync'd. Thus, changes made in a
+provisioner might not be saved.
+
+## Configuration Reference
+
+There are many configuration options available for the VirtualBox builder. They
+are organized below into two categories: required and optional. Within each
+category, the available options are alphabetized and described.
+
+In addition to the options listed here, a
+[communicator](/docs/templates/communicator.html) can be configured for this
+builder.
+
+### Required:
+
+-   `vm_name` (string) - This is the name of the virtual machine to which the
+    builder shall attach.
+
+### Optional:
+
+-   `attach_snapshot` (string) - Default to `null/empty`. The name of an
+    **existing** snapshot to which the builder shall attach the VM before
+    starting it. If no snapshot is specified the builder will simply start the
+    VM from it's current state i.e. snapshot.
+
+-   `boot_command` (array of strings) - This is an array of commands to type
+    when the virtual machine is first booted. The goal of these commands should
+    be to type just enough to initialize the operating system installer. Special
+    keys can be typed as well, and are covered in the section below on the
+    boot command. If this is not specified, it is assumed the installer will
+    start itself.
+
+-   `boot_wait` (string) - The time to wait after booting the initial virtual
+    machine before typing the `boot_command`. The value of this should be
+    a duration. Examples are `5s` and `1m30s` which will cause Packer to wait
+    five seconds and one minute 30 seconds, respectively. If this isn't
+    specified, the default is `10s` or 10 seconds.
+
+-   `export_opts` (array of strings) - Additional options to pass to the
+    [VBoxManage
+    export](https://www.virtualbox.org/manual/ch09.html#vboxmanage-export). This
+    can be useful for passing product information to include in the resulting
+    appliance file. Packer JSON configuration file example:
+
+    ``` json
+    {
+      "type": "virtualbox-vm",
+      "export_opts":
+      [
+        "--manifest",
+        "--vsys", "0",
+        "--description", "{{user `vm_description`}}",
+        "--version", "{{user `vm_version`}}"
+      ],
+      "format": "ova",
+    }
+    ```
+
+    A VirtualBox [VM
+    description](https://www.virtualbox.org/manual/ch09.html#vboxmanage-export-ovf)
+    may contain arbitrary strings; the GUI interprets HTML formatting. However,
+    the JSON format does not allow arbitrary newlines within a value. Add a
+    multi-line description by preparing the string in the shell before the
+    packer call like this (shell `>` continuation character snipped for easier
+    copy & paste):
+
+    ``` {.shell}
+
+    vm_description='some
+    multiline
+    description'
+
+    vm_version='0.2.0'
+
+    packer build \
+        -var "vm_description=${vm_description}" \
+        -var "vm_version=${vm_version}"         \
+        "packer_conf.json"
+    ```
+
+-   `floppy_dirs` (array of strings) - A list of directories to place onto
+    the floppy disk recursively. This is similar to the `floppy_files` option
+    except that the directory structure is preserved. This is useful for when
+    your floppy disk includes drivers or if you just want to organize it's
+    contents as a hierarchy. Wildcard characters (\*, ?, and \[\]) are allowed.
+
+-   `floppy_files` (array of strings) - A list of files to place onto a floppy
+    disk that is attached when the VM is booted. This is most useful for
+    unattended Windows installs, which look for an `Autounattend.xml` file on
+    removable media. By default, no floppy will be attached. All files listed in
+    this setting get placed into the root directory of the floppy and the floppy
+    is attached as the first floppy device. Currently, no support exists for
+    creating sub-directories on the floppy. Wildcard characters (\*, ?,
+    and \[\]) are allowed. Directory names are also allowed, which will add all
+    the files found in the directory to the floppy.
+
+-   `force_delete_snapshot` (boolean) - Defaults to `false`. If set to `true`,
+    overwrite an existing `target_snapshot`. Otherwise the builder will yield an
+    error if the specified target snapshot already exists.
+
+-   `format` (string) - Either `ovf` or `ova`, this specifies the output format
+    of the exported virtual machine. This defaults to `ovf`.
+
+-   `guest_additions_interface` (string) - The interface type to use to mount
+    guest additions when `guest_additions_mode` is set to `attach`. Will
+    default to the value set in `iso_interface`, if `iso_interface` is set.
+    Will default to "ide", if `iso_interface` is not set. Options are "ide" and
+    "sata".
+
+-   `guest_additions_mode` (string) - The method by which guest additions are
+    made available to the guest for installation. Valid options are `upload`,
+    `attach`, or `disable`. If the mode is `attach` the guest additions ISO will
+    be attached as a CD device to the virtual machine. If the mode is `upload`
+    the guest additions ISO will be uploaded to the path specified by
+    `guest_additions_path`. The default value is `upload`. If `disable` is used,
+    guest additions won't be downloaded, either.
+
+-   `guest_additions_path` (string) - The path on the guest virtual machine
+    where the VirtualBox guest additions ISO will be uploaded. By default this
+    is `VBoxGuestAdditions.iso` which should upload into the login directory of
+    the user. This is a [configuration
+    template](/docs/templates/engine.html) where the `Version`
+    variable is replaced with the VirtualBox version.
+
+-   `guest_additions_sha256` (string) - The SHA256 checksum of the guest
+    additions ISO that will be uploaded to the guest VM. By default the
+    checksums will be downloaded from the VirtualBox website, so this only needs
+    to be set if you want to be explicit about the checksum.
+
+-   `guest_additions_url` (string) - The URL to the guest additions ISO
+    to upload. This can also be a file URL if the ISO is at a local path. By
+    default, the VirtualBox builder will attempt to find the guest additions ISO
+    on the local file system. If it is not available locally, the builder will
+    download the proper guest additions ISO from the internet.
+
+-   `guest_os_type` (string) - The guest OS type being installed. By default
+    this is `other`, but you can get *dramatic* performance improvements by
+    setting this to the proper value. To view all available values for this run
+    `VBoxManage list ostypes`. Setting the correct value hints to VirtualBox how
+    to optimize the virtual hardware to work best with that operating system.
+
+-   `headless` (boolean) - Packer defaults to building VirtualBox virtual
+    machines by launching a GUI that shows the console of the machine
+    being built. When this value is set to `true`, the machine will start
+    without a console.
+
+-   `http_directory` (string) - Path to a directory to serve using an
+    HTTP server. The files in this directory will be available over HTTP that
+    will be requestable from the virtual machine. This is useful for hosting
+    kickstart files and so on. By default this is an empty string, which means
+    no HTTP server will be started. The address and port of the HTTP server will
+    be available as variables in `boot_command`. This is covered in more detail
+    below.
+
+-   `http_port_min` and `http_port_max` (number) - These are the minimum and
+    maximum port to use for the HTTP server started to serve the
+    `http_directory`. Because Packer often runs in parallel, Packer will choose
+    a randomly available port in this range to run the HTTP server. If you want
+    to force the HTTP server to be on one port, make this minimum and maximum
+    port the same. By default the values are `8000` and `9000`, respectively.
+
+-   `keep_registered` (boolean) - Set this to `true` if you would like to keep
+    the VM attached to the snapshot specified by `attach_snapshot`. Otherwise
+    the builder will reset the VM to the snapshot to which the VM was attached
+    before the builder started. Defaults to `false`.
+
+-   `output_directory` (string) - This is the path to the directory where the
+    resulting virtual machine will be created. This may be relative or absolute.
+    If relative, the path is relative to the working directory when `packer`
+    is executed. This directory must not exist or be empty prior to running
+    the builder. By default this is `output-BUILDNAME` where "BUILDNAME" is the
+    name of the build.
+
+-   `post_shutdown_delay` (string) - The amount of time to wait after shutting
+    down the virtual machine. Defaults to `2s`. **Hint:** Don't specify a value
+    smaller than `2s` because otherwise the creation of a target snapshot might
+    corrupt the VM because not all locks has been released by VirtualBox.
+
+-   `shutdown_command` (string) - The command to use to gracefully shut down the
+    machine once all the provisioning is done. By default this is an empty
+    string, which tells Packer to just forcefully shut down the machine unless a
+    shutdown command takes place inside script so this may safely be omitted. If
+    one or more scripts require a reboot it is suggested to leave this blank
+    since reboots may fail and specify the final shutdown command in your
+    last script.
+
+-   `shutdown_timeout` (string) - The amount of time to wait after executing the
+    `shutdown_command` for the virtual machine to actually shut down. If it
+    doesn't shut down in this time, it is an error. By default, the timeout is
+    `5m` or five minutes.
+
+-   `skip_export` (boolean) - Defaults to `false`. When enabled, Packer will
+    not export the VM. Useful if the builder should be applied again on the created
+    target snapshot.
+
+-   `ssh_host_port_min` and `ssh_host_port_max` (number) - The minimum and
+    maximum port to use for the SSH port on the host machine which is forwarded
+    to the SSH port on the guest machine. Because Packer often runs in parallel,
+    Packer will choose a randomly available port in this range to use as the
+    host port. By default this is `2222` to `4444`.
+
+-   `ssh_skip_nat_mapping` (boolean) - Defaults to `false`. When enabled, Packer
+    does not setup forwarded port mapping for SSH requests and uses `ssh_port`
+    on the host to communicate to the virtual machine.
+
+-   `target_snapshot` (string) - Default to `null/empty`. The name of the
+    snapshot which shall be created after all provisioners has been run by the
+    builder. If no target snapshot is specified and `keep_registered` is set to
+    `false` the builder will revert to the snapshot to which the VM was attached
+    before the builder has been executed, which will revert all changes applied
+    by the provisioners. This is handy if only an export shall be created and no
+    further snapshot is required.
+
+-   `vboxmanage` (array of array of strings) - Custom `VBoxManage` commands to
+    execute in order to further customize the virtual machine being created. The
+    value of this is an array of commands to execute. The commands are executed
+    in the order defined in the template. For each command, the command is
+    defined itself as an array of strings, where each string represents a single
+    argument on the command-line to `VBoxManage` (but excluding
+    `VBoxManage` itself). Each arg is treated as a [configuration
+    template](/docs/templates/engine.html), where the `Name`
+    variable is replaced with the VM name. More details on how to use
+    `VBoxManage` are below.
+
+-   `vboxmanage_post` (array of array of strings) - Identical to `vboxmanage`,
+    except that it is run after the virtual machine is shutdown, and before the
+    virtual machine is exported.
+
+-   `virtualbox_version_file` (string) - The path within the virtual machine to
+    upload a file that contains the VirtualBox version that was used to create
+    the machine. This information can be useful for provisioning. By default
+    this is `.vbox_version`, which will generally be uploaded into the home
+    directory. Set to an empty string to skip uploading this file, which can be
+    useful when using the `none` communicator.
+
+-   `vrdp_bind_address` (string / IP address) - The IP address that should be
+    binded to for VRDP. By default packer will use `127.0.0.1` for this. If you
+    wish to bind to all interfaces use `0.0.0.0`.
+
+-   `vrdp_port_min` and `vrdp_port_max` (number) - The minimum and maximum port
+    to use for VRDP access to the virtual machine. Packer uses a randomly chosen
+    port in this range that appears available. By default this is `5900` to
+    `6000`. The minimum and maximum ports are inclusive.
+
+## Boot Command
+
+The `boot_command` configuration is very important: it specifies the keys to
+type when the virtual machine is first booted in order to start the OS
+installer. This command is typed after `boot_wait`, which gives the virtual
+machine some time to actually load the ISO.
+
+As documented above, the `boot_command` is an array of strings. The strings are
+all typed in sequence. It is an array only to improve readability within the
+template.
+
+The boot command is sent to the VM through the `VBoxManage` utility in as few
+invocations as possible. We send each character in groups of 25, with a default
+delay of 100ms between groups. The delay alleviates issues with latency and CPU
+contention. If you notice missing keys, you can tune this delay by specifying
+"boot_keygroup_interval" in your Packer template, for example:
+
+```
+{
+  "builders": [
+    {
+      "type": "virtualbox",
+      "boot_keygroup_interval": "500ms"
+      ...
+    }
+  ]
+}
+```
+
+<%= partial "partials/builders/boot-command" %>
+
+<%= partial "partials/builders/virtualbox-ssh-key-pair" %>
+
+Example boot command. This is actually a working boot command used to start an
+Ubuntu 12.04 installer:
+
+``` text
+[
+  "<esc><esc><enter><wait>",
+  "/install/vmlinuz noapic ",
+  "preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/preseed.cfg ",
+  "debian-installer=en_US auto locale=en_US kbd-chooser/method=us ",
+  "hostname={{ .Name }} ",
+  "fb=false debconf/frontend=noninteractive ",
+  "keyboard-configuration/modelcode=SKIP keyboard-configuration/layout=USA ",
+  "keyboard-configuration/variant=USA console-setup/ask_detect=false ",
+  "initrd=/install/initrd.gz -- <enter>"
+]
+```
+
+Please note that for the Virtuabox builder, the IP address of the HTTP server
+Packer launches for you to access files like the preseed file in the example
+above (`{{ .HTTPIP }}`) is hardcoded to 10.0.2.2. If you change the network
+of your VM you must guarantee that you can still access this HTTP server.
+
+For more examples of various boot commands, see the sample projects from our
+[community templates page](/community-tools.html#templates).
+
+## Guest Additions
+
+Packer will automatically download the proper guest additions for the version of
+VirtualBox that is running and upload those guest additions into the virtual
+machine so that provisioners can easily install them.
+
+Packer downloads the guest additions from the official VirtualBox website, and
+verifies the file with the official checksums released by VirtualBox.
+
+After the virtual machine is up and the operating system is installed, Packer
+uploads the guest additions into the virtual machine. The path where they are
+uploaded is controllable by `guest_additions_path`, and defaults to
+"VBoxGuestAdditions.iso". Without an absolute path, it is uploaded to the home
+directory of the SSH user.
+
+## VBoxManage Commands
+
+In order to perform extra customization of the virtual machine, a template can
+define extra calls to `VBoxManage` to perform.
+[VBoxManage](https://www.virtualbox.org/manual/ch09.html) is the command-line
+interface to VirtualBox where you can completely control VirtualBox. It can be
+used to do things such as set RAM, CPUs, etc.
+
+Extra VBoxManage commands are defined in the template in the `vboxmanage`
+section. An example is shown below that sets the VRAM within the virtual machine:
+
+``` json
+{
+  "vboxmanage": [
+    ["modifyvm", "{{.Name}}", "--vram", "64"]
+  ]
+}
+```
+
+The value of `vboxmanage` is an array of commands to execute. These commands are
+executed in the order defined. So in the above example, the memory will be set
+followed by the CPUs.
+
+Each command itself is an array of strings, where each string is an argument to
+`VBoxManage`. Each argument is treated as a [configuration
+template](/docs/templates/engine.html). The only available
+variable is `Name` which is replaced with the unique name of the VM, which is
+required for many VBoxManage calls.

website/source/docs/builders/virtualbox.html.md

@@ -28,3 +28,10 @@ supports the following VirtualBox builders:
     VirtualBox VM export you want to use as the source. As an additional
     benefit, you can feed the artifact of this builder back into itself to
     iterate on a machine.
+
+-   [virtualbox-vm](/docs/builders/virtualbox-vm.html) - This builder uses an
+    existing VM to run defined provisioners on top of that VM, and optionally
+    creates a snapshot to save the changes applied from the provisioners. In
+    addition the builder is able to export that machine to create an image. The
+    builder is able to attach to a defined snapshot as a starting point, which
+    could be defined statically or dynamically via a variable.

website/source/layouts/docs.erb

@@ -209,6 +209,9 @@
               <li<%= sidebar_current("docs-builders-virtualbox-ovf") %>>
                 <a href="/docs/builders/virtualbox-ovf.html">OVF</a>
               </li>
+              <li<%= sidebar_current("docs-builders-virtualbox-vm") %>>
+                <a href="/docs/builders/virtualbox-vm.html">VM</a>
+              </li>
             </ul>
           </li>
           <li<%= sidebar_current("docs-builders-vmware") %>>