Merge branch 'builder-amazon-instance'

This adds the "amazon-instance" builder to Packer which can create
instance-storage backed AMIs. The instance-storage backed AMIs are built
by launching another instance-store backed instance, provisioning it,
and then using EC2 AMI tools to bundle and register a new AMI.

builder/amazon/common/access_config.go

@@ -0,0 +1,21 @@
+package common
+
+import (
+	"github.com/mitchellh/goamz/aws"
+)
+
+// AccessConfig is for common configuration related to AWS access
+type AccessConfig struct {
+	AccessKey string `mapstructure:"access_key"`
+	SecretKey string `mapstructure:"secret_key"`
+}
+
+// Auth returns a valid aws.Auth object for access to AWS services, or
+// an error if the authentication couldn't be resolved.
+func (c *AccessConfig) Auth() (aws.Auth, error) {
+	return aws.GetAuth(c.AccessKey, c.SecretKey)
+}
+
+func (c *AccessConfig) Prepare() []error {
+	return nil
+}

builder/amazon/common/ami.go

@@ -0,0 +1,25 @@
+package common
+
+import (
+	"github.com/mitchellh/goamz/ec2"
+	"log"
+	"time"
+)
+
+// WaitForAMI waits for the given AMI ID to become ready.
+func WaitForAMI(c *ec2.EC2, imageId string) error {
+	for {
+		imageResp, err := c.Images([]string{imageId}, ec2.NewFilter())
+		if err != nil {
+			return err
+		}
+
+		if imageResp.Images[0].State == "available" {
+			return nil
+		}
+
+		log.Printf("Image in state %s, sleeping 2s before checking again",
+			imageResp.Images[0].State)
+		time.Sleep(2 * time.Second)
+	}
+}

builder/amazon/common/artifact.go

@@ -1,4 +1,4 @@
-package ebs
+package common
 
 import (
 	"fmt"
@@ -8,35 +8,39 @@ import (
 	"strings"
 )
 
-type artifact struct {
+// Artifact is an artifact implementation that contains built AMIs.
+type Artifact struct {
 	// A map of regions to AMI IDs.
-	amis map[string]string
+	Amis map[string]string
+
+	// BuilderId is the unique ID for the builder that created this AMI
+	BuilderIdValue string
 
 	// EC2 connection for performing API stuff.
-	conn *ec2.EC2
+	Conn *ec2.EC2
 }
 
-func (*artifact) BuilderId() string {
-	return BuilderId
+func (a *Artifact) BuilderId() string {
+	return a.BuilderIdValue
 }
 
-func (*artifact) Files() []string {
+func (*Artifact) Files() []string {
 	// We have no files
 	return nil
 }
 
-func (a *artifact) Id() string {
-	parts := make([]string, 0, len(a.amis))
-	for region, amiId := range a.amis {
+func (a *Artifact) Id() string {
+	parts := make([]string, 0, len(a.Amis))
+	for region, amiId := range a.Amis {
 		parts = append(parts, fmt.Sprintf("%s:%s", region, amiId))
 	}
 
 	return strings.Join(parts, ",")
 }
 
-func (a *artifact) String() string {
-	amiStrings := make([]string, 0, len(a.amis))
-	for region, id := range a.amis {
+func (a *Artifact) String() string {
+	amiStrings := make([]string, 0, len(a.Amis))
+	for region, id := range a.Amis {
 		single := fmt.Sprintf("%s: %s", region, id)
 		amiStrings = append(amiStrings, single)
 	}
@@ -44,12 +48,12 @@ func (a *artifact) String() string {
 	return fmt.Sprintf("AMIs were created:\n\n%s", strings.Join(amiStrings, "\n"))
 }
 
-func (a *artifact) Destroy() error {
+func (a *Artifact) Destroy() error {
 	errors := make([]error, 0)
 
-	for _, imageId := range a.amis {
+	for _, imageId := range a.Amis {
 		log.Printf("Deregistering image ID: %s", imageId)
-		if _, err := a.conn.DeregisterImage(imageId); err != nil {
+		if _, err := a.Conn.DeregisterImage(imageId); err != nil {
 			errors = append(errors, err)
 		}
 

builder/amazon/common/artifact_test.go

@@ -1,4 +1,4 @@
-package ebs
+package common
 
 import (
 	"cgl.tideland.biz/asserts"
@@ -10,7 +10,7 @@ func TestArtifact_Impl(t *testing.T) {
 	assert := asserts.NewTestingAsserts(t, true)
 
 	var actual packer.Artifact
-	assert.Implementor(&artifact{}, &actual, "should be an Artifact")
+	assert.Implementor(&Artifact{}, &actual, "should be an Artifact")
 }
 
 func TestArtifactId(t *testing.T) {
@@ -22,7 +22,10 @@ func TestArtifactId(t *testing.T) {
 	amis["east"] = "foo"
 	amis["west"] = "bar"
 
-	a := &artifact{amis, nil}
+	a := &Artifact{
+		Amis: amis,
+	}
+
 	result := a.Id()
 	assert.Equal(result, expected, "should match output")
 }
@@ -39,7 +42,7 @@ west: bar`
 	amis["east"] = "foo"
 	amis["west"] = "bar"
 
-	a := &artifact{amis, nil}
+	a := &Artifact{Amis: amis}
 	result := a.String()
 	assert.Equal(result, expected, "should match output")
 }

builder/amazon/common/instance.go

@@ -1,4 +1,4 @@
-package ebs
+package common
 
 import (
 	"fmt"
@@ -7,7 +7,7 @@ import (
 	"time"
 )
 
-func waitForState(ec2conn *ec2.EC2, originalInstance *ec2.Instance, pending []string, target string) (i *ec2.Instance, err error) {
+func WaitForState(ec2conn *ec2.EC2, originalInstance *ec2.Instance, pending []string, target string) (i *ec2.Instance, err error) {
 	log.Printf("Waiting for instance state to become: %s", target)
 
 	i = originalInstance

builder/amazon/common/run_config.go

@@ -0,0 +1,68 @@
+package common
+
+import (
+	"errors"
+	"fmt"
+	"github.com/mitchellh/goamz/aws"
+	"time"
+)
+
+// RunConfig contains configuration for running an instance from a source
+// AMI and details on how to access that launched image.
+type RunConfig struct {
+	Region          string
+	SourceAmi       string `mapstructure:"source_ami"`
+	InstanceType    string `mapstructure:"instance_type"`
+	RawSSHTimeout   string `mapstructure:"ssh_timeout"`
+	SSHUsername     string `mapstructure:"ssh_username"`
+	SSHPort         int    `mapstructure:"ssh_port"`
+	SecurityGroupId string `mapstructure:"security_group_id"`
+	SubnetId        string `mapstructure:"subnet_id"`
+	VpcId           string `mapstructure:"vpc_id"`
+
+	// Unexported fields that are calculated from others
+	sshTimeout time.Duration
+}
+
+func (c *RunConfig) Prepare() []error {
+	// Defaults
+	if c.SSHPort == 0 {
+		c.SSHPort = 22
+	}
+
+	if c.RawSSHTimeout == "" {
+		c.RawSSHTimeout = "1m"
+	}
+
+	// Validation
+	var err error
+	errs := make([]error, 0)
+	if c.SourceAmi == "" {
+		errs = append(errs, errors.New("A source_ami must be specified"))
+	}
+
+	if c.InstanceType == "" {
+		errs = append(errs, errors.New("An instance_type must be specified"))
+	}
+
+	if c.Region == "" {
+		errs = append(errs, errors.New("A region must be specified"))
+	} else if _, ok := aws.Regions[c.Region]; !ok {
+		errs = append(errs, fmt.Errorf("Unknown region: %s", c.Region))
+	}
+
+	if c.SSHUsername == "" {
+		errs = append(errs, errors.New("An ssh_username must be specified"))
+	}
+
+	c.sshTimeout, err = time.ParseDuration(c.RawSSHTimeout)
+	if err != nil {
+		errs = append(errs, fmt.Errorf("Failed parsing ssh_timeout: %s", err))
+	}
+
+	return errs
+}
+
+func (c *RunConfig) SSHTimeout() time.Duration {
+	return c.sshTimeout
+}

builder/amazon/common/run_config_test.go

@@ -0,0 +1,108 @@
+package common
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	// Clear out the AWS access key env vars so they don't
+	// affect our tests.
+	os.Setenv("AWS_ACCESS_KEY_ID", "")
+	os.Setenv("AWS_ACCESS_KEY", "")
+	os.Setenv("AWS_SECRET_ACCESS_KEY", "")
+	os.Setenv("AWS_SECRET_KEY", "")
+}
+
+func testConfig() *RunConfig {
+	return &RunConfig{
+		Region:       "us-east-1",
+		SourceAmi:    "abcd",
+		InstanceType: "m1.small",
+		SSHUsername:  "root",
+	}
+}
+
+func TestRunConfigPrepare(t *testing.T) {
+	c := testConfig()
+	err := c.Prepare()
+	if len(err) > 0 {
+		t.Fatalf("err: %s", err)
+	}
+}
+
+func TestRunConfigPrepare_InstanceType(t *testing.T) {
+	c := testConfig()
+	c.InstanceType = ""
+	if err := c.Prepare(); len(err) != 1 {
+		t.Fatalf("err: %s", err)
+	}
+}
+
+func TestRunConfigPrepare_Region(t *testing.T) {
+	c := testConfig()
+	c.Region = ""
+	if err := c.Prepare(); len(err) != 1 {
+		t.Fatalf("err: %s", err)
+	}
+
+	c.Region = "us-east-12"
+	if err := c.Prepare(); len(err) != 1 {
+		t.Fatalf("err: %s", err)
+	}
+
+	c.Region = "us-east-1"
+	if err := c.Prepare(); len(err) != 0 {
+		t.Fatalf("err: %s", err)
+	}
+}
+
+func TestRunConfigPrepare_SourceAmi(t *testing.T) {
+	c := testConfig()
+	c.SourceAmi = ""
+	if err := c.Prepare(); len(err) != 1 {
+		t.Fatalf("err: %s", err)
+	}
+}
+
+func TestRunConfigPrepare_SSHPort(t *testing.T) {
+	c := testConfig()
+	c.SSHPort = 0
+	if err := c.Prepare(); len(err) != 0 {
+		t.Fatalf("err: %s", err)
+	}
+
+	if c.SSHPort != 22 {
+		t.Fatalf("invalid value: %d", c.SSHPort)
+	}
+
+	c.SSHPort = 44
+	if err := c.Prepare(); len(err) != 0 {
+		t.Fatalf("err: %s", err)
+	}
+
+	if c.SSHPort != 44 {
+		t.Fatalf("invalid value: %d", c.SSHPort)
+	}
+}
+
+func TestRunConfigPrepare_SSHTimeout(t *testing.T) {
+	c := testConfig()
+	c.RawSSHTimeout = ""
+	if err := c.Prepare(); len(err) != 0 {
+		t.Fatalf("err: %s", err)
+	}
+
+	c.RawSSHTimeout = "bad"
+	if err := c.Prepare(); len(err) != 1 {
+		t.Fatalf("err: %s", err)
+	}
+}
+
+func TestRunConfigPrepare_SSHUsername(t *testing.T) {
+	c := testConfig()
+	c.SSHUsername = ""
+	if err := c.Prepare(); len(err) != 1 {
+		t.Fatalf("err: %s", err)
+	}
+}

builder/amazon/common/ssh.go

@@ -0,0 +1,45 @@
+package common
+
+import (
+	gossh "code.google.com/p/go.crypto/ssh"
+	"fmt"
+	"github.com/mitchellh/goamz/ec2"
+	"github.com/mitchellh/packer/communicator/ssh"
+)
+
+// SSHAddress returns a function that can be given to the SSH communicator
+// for determining the SSH address based on the instance DNS name.
+func SSHAddress(port int) func(map[string]interface{}) (string, error) {
+	return func(state map[string]interface{}) (string, error) {
+		var host string
+		instance := state["instance"].(*ec2.Instance)
+		if instance.VpcId != "" {
+			host = instance.PrivateIpAddress
+		} else {
+			host = instance.DNSName
+		}
+
+		return fmt.Sprintf("%s:%d", host, port), nil
+	}
+}
+
+// SSHConfig returns a function that can be used for the SSH communicator
+// config for connecting to the instance created over SSH using the generated
+// private key.
+func SSHConfig(username string) func(map[string]interface{}) (*gossh.ClientConfig, error) {
+	return func(state map[string]interface{}) (*gossh.ClientConfig, error) {
+		privateKey := state["privateKey"].(string)
+
+		keyring := new(ssh.SimpleKeychain)
+		if err := keyring.AddPEMKey(privateKey); err != nil {
+			return nil, fmt.Errorf("Error setting up SSH config: %s", err)
+		}
+
+		return &gossh.ClientConfig{
+			User: username,
+			Auth: []gossh.ClientAuth{
+				gossh.ClientAuthKeyring(keyring),
+			},
+		}, nil
+	}
+}

builder/amazon/common/step_key_pair.go

@@ -1,4 +1,4 @@
-package ebs
+package common
 
 import (
 	"cgl.tideland.biz/identifier"
@@ -10,11 +10,11 @@ import (
 	"log"
 )
 
-type stepKeyPair struct {
+type StepKeyPair struct {
 	keyName string
 }
 
-func (s *stepKeyPair) Run(state map[string]interface{}) multistep.StepAction {
+func (s *StepKeyPair) Run(state map[string]interface{}) multistep.StepAction {
 	ec2conn := state["ec2"].(*ec2.EC2)
 	ui := state["ui"].(packer.Ui)
 
@@ -23,9 +23,7 @@ func (s *stepKeyPair) Run(state map[string]interface{}) multistep.StepAction {
 	log.Printf("temporary keypair name: %s", keyName)
 	keyResp, err := ec2conn.CreateKeyPair(keyName)
 	if err != nil {
-		err := fmt.Errorf("Error creating temporary keypair: %s", err)
-		state["error"] = err
-		ui.Error(err.Error())
+		state["error"] = fmt.Errorf("Error creating temporary keypair: %s", err)
 		return multistep.ActionHalt
 	}
 
@@ -39,7 +37,7 @@ func (s *stepKeyPair) Run(state map[string]interface{}) multistep.StepAction {
 	return multistep.ActionContinue
 }
 
-func (s *stepKeyPair) Cleanup(state map[string]interface{}) {
+func (s *StepKeyPair) Cleanup(state map[string]interface{}) {
 	// If no key name is set, then we never created it, so just return
 	if s.keyName == "" {
 		return

builder/amazon/common/step_run_source_instance.go

@@ -1,4 +1,4 @@
-package ebs
+package common
 
 import (
 	"fmt"
@@ -8,12 +8,16 @@ import (
 	"log"
 )
 
-type stepRunSourceInstance struct {
+type StepRunSourceInstance struct {
+	ExpectedRootDevice string
+	InstanceType       string
+	SourceAMI          string
+	SubnetId           string
+
 	instance *ec2.Instance
 }
 
-func (s *stepRunSourceInstance) Run(state map[string]interface{}) multistep.StepAction {
-	config := state["config"].(config)
+func (s *StepRunSourceInstance) Run(state map[string]interface{}) multistep.StepAction {
 	ec2conn := state["ec2"].(*ec2.EC2)
 	keyName := state["keyPair"].(string)
 	securityGroupId := state["securityGroupId"].(string)
@@ -21,25 +25,26 @@ func (s *stepRunSourceInstance) Run(state map[string]interface{}) multistep.Step
 
 	runOpts := &ec2.RunInstances{
 		KeyName:        keyName,
-		ImageId:        config.SourceAmi,
-		InstanceType:   config.InstanceType,
+		ImageId:        s.SourceAMI,
+		InstanceType:   s.InstanceType,
 		MinCount:       0,
 		MaxCount:       0,
 		SecurityGroups: []ec2.SecurityGroup{ec2.SecurityGroup{Id: securityGroupId}},
-		SubnetId:       config.SubnetId,
+		SubnetId:       s.SubnetId,
 	}
 
 	ui.Say("Launching a source AWS instance...")
-	imageResp, err := ec2conn.Images([]string{config.SourceAmi}, ec2.NewFilter())
+	imageResp, err := ec2conn.Images([]string{s.SourceAMI}, ec2.NewFilter())
 	if err != nil {
 		state["error"] = fmt.Errorf("There was a problem with the source AMI: %s", err)
 		return multistep.ActionHalt
 	}
 
-	if imageResp.Images[0].RootDeviceType != "ebs" {
+	if s.ExpectedRootDevice != "" && imageResp.Images[0].RootDeviceType != s.ExpectedRootDevice {
 		state["error"] = fmt.Errorf(
-			"The provided source AMI is instance-store based. The\n" +
-				"amazon-ebs bundler can only work with EBS based AMIs.")
+			"The provided source AMI has an invalid root device type.\n"+
+				"Expected '%s', got '%s'.",
+			s.ExpectedRootDevice, imageResp.Images[0].RootDeviceType)
 		return multistep.ActionHalt
 	}
 
@@ -55,7 +60,7 @@ func (s *stepRunSourceInstance) Run(state map[string]interface{}) multistep.Step
 	log.Printf("instance id: %s", s.instance.InstanceId)
 
 	ui.Say(fmt.Sprintf("Waiting for instance (%s) to become ready...", s.instance.InstanceId))
-	s.instance, err = waitForState(ec2conn, s.instance, []string{"pending"}, "running")
+	s.instance, err = WaitForState(ec2conn, s.instance, []string{"pending"}, "running")
 	if err != nil {
 		err := fmt.Errorf("Error waiting for instance (%s) to become ready: %s", s.instance.InstanceId, err)
 		state["error"] = err
@@ -68,7 +73,7 @@ func (s *stepRunSourceInstance) Run(state map[string]interface{}) multistep.Step
 	return multistep.ActionContinue
 }
 
-func (s *stepRunSourceInstance) Cleanup(state map[string]interface{}) {
+func (s *StepRunSourceInstance) Cleanup(state map[string]interface{}) {
 	if s.instance == nil {
 		return
 	}
@@ -83,5 +88,5 @@ func (s *stepRunSourceInstance) Cleanup(state map[string]interface{}) {
 	}
 
 	pending := []string{"pending", "running", "shutting-down", "stopped", "stopping"}
-	waitForState(ec2conn, s.instance, pending, "terminated")
+	WaitForState(ec2conn, s.instance, pending, "terminated")
 }

builder/amazon/common/step_security_group.go

@@ -1,4 +1,4 @@
-package ebs
+package common
 
 import (
 	"cgl.tideland.biz/identifier"
@@ -10,40 +10,52 @@ import (
 	"log"
 )
 
-type stepSecurityGroup struct {
-	groupId string
+type StepSecurityGroup struct {
+	SecurityGroupId string
+	SSHPort         int
+	VpcId           string
+
+	createdGroupId string
 }
 
-func (s *stepSecurityGroup) Run(state map[string]interface{}) multistep.StepAction {
-	config := state["config"].(config)
+func (s *StepSecurityGroup) Run(state map[string]interface{}) multistep.StepAction {
 	ec2conn := state["ec2"].(*ec2.EC2)
 	ui := state["ui"].(packer.Ui)
 
-	if config.SecurityGroupId != "" {
-		log.Printf("Using specified security group: %s", config.SecurityGroupId)
-		state["securityGroupId"] = config.SecurityGroupId
+	if s.SecurityGroupId != "" {
+		log.Printf("Using specified security group: %s", s.SecurityGroupId)
+		state["securityGroupId"] = s.SecurityGroupId
 		return multistep.ActionContinue
 	}
 
+	if s.SSHPort == 0 {
+		panic("SSHPort must be set to a non-zero value.")
+	}
+
 	// Create the group
 	ui.Say("Creating temporary security group for this instance...")
 	groupName := fmt.Sprintf("packer %s", hex.EncodeToString(identifier.NewUUID().Raw()))
 	log.Printf("Temporary group name: %s", groupName)
-	groupResp, err := ec2conn.CreateSecurityGroup(ec2.SecurityGroup{Name: groupName, Description: "Temporary group for Packer", VpcId: config.VpcId})
+	group := ec2.SecurityGroup{
+		Name:        groupName,
+		Description: "Temporary group for Packer",
+		VpcId:       s.VpcId,
+	}
+	groupResp, err := ec2conn.CreateSecurityGroup(group)
 	if err != nil {
 		ui.Error(err.Error())
 		return multistep.ActionHalt
 	}
 
 	// Set the group ID so we can delete it later
-	s.groupId = groupResp.Id
+	s.createdGroupId = groupResp.Id
 
 	// Authorize the SSH access
 	perms := []ec2.IPPerm{
 		ec2.IPPerm{
 			Protocol:  "tcp",
-			FromPort:  config.SSHPort,
-			ToPort:    config.SSHPort,
+			FromPort:  s.SSHPort,
+			ToPort:    s.SSHPort,
 			SourceIPs: []string{"0.0.0.0/0"},
 		},
 	}
@@ -57,13 +69,13 @@ func (s *stepSecurityGroup) Run(state map[string]interface{}) multistep.StepActi
 	}
 
 	// Set some state data for use in future steps
-	state["securityGroupId"] = s.groupId
+	state["securityGroupId"] = s.createdGroupId
 
 	return multistep.ActionContinue
 }
 
-func (s *stepSecurityGroup) Cleanup(state map[string]interface{}) {
-	if s.groupId == "" {
+func (s *StepSecurityGroup) Cleanup(state map[string]interface{}) {
+	if s.createdGroupId == "" {
 		return
 	}
 
@@ -71,10 +83,10 @@ func (s *stepSecurityGroup) Cleanup(state map[string]interface{}) {
 	ui := state["ui"].(packer.Ui)
 
 	ui.Say("Deleting temporary security group...")
-	_, err := ec2conn.DeleteSecurityGroup(ec2.SecurityGroup{Id: s.groupId})
+	_, err := ec2conn.DeleteSecurityGroup(ec2.SecurityGroup{Id: s.createdGroupId})
 	if err != nil {
 		log.Printf("Error deleting security group: %s", err)
 		ui.Error(fmt.Sprintf(
-			"Error cleaning up security group. Please delete the group manually: %s", s.groupId))
+			"Error cleaning up security group. Please delete the group manually: %s", s.createdGroupId))
 	}
 }

builder/amazon/ebs/builder.go

@@ -11,39 +11,23 @@ import (
 	"github.com/mitchellh/goamz/aws"
 	"github.com/mitchellh/goamz/ec2"
 	"github.com/mitchellh/multistep"
+	awscommon "github.com/mitchellh/packer/builder/amazon/common"
 	"github.com/mitchellh/packer/builder/common"
 	"github.com/mitchellh/packer/packer"
 	"log"
 	"text/template"
-	"time"
 )
 
 // The unique ID for this builder
 const BuilderId = "mitchellh.amazonebs"
 
 type config struct {
-	// Access information
-	AccessKey string `mapstructure:"access_key"`
-	SecretKey string `mapstructure:"secret_key"`
-
-	// Information for the source instance
-	Region          string
-	SourceAmi       string `mapstructure:"source_ami"`
-	InstanceType    string `mapstructure:"instance_type"`
-	SSHUsername     string `mapstructure:"ssh_username"`
-	SSHPort         int    `mapstructure:"ssh_port"`
-	SecurityGroupId string `mapstructure:"security_group_id"`
-	VpcId           string `mapstructure:"vpc_id"`
-	SubnetId        string `mapstructure:"subnet_id"`
+	common.PackerConfig    `mapstructure:",squash"`
+	awscommon.AccessConfig `mapstructure:",squash"`
+	awscommon.RunConfig    `mapstructure:",squash"`
 
 	// Configuration of the resulting AMI
 	AMIName string `mapstructure:"ami_name"`
-
-	PackerDebug   bool   `mapstructure:"packer_debug"`
-	RawSSHTimeout string `mapstructure:"ssh_timeout"`
-
-	// Unexported fields that are calculated from others
-	sshTimeout time.Duration
 }
 
 type Builder struct {
@@ -59,45 +43,10 @@ func (b *Builder) Prepare(raws ...interface{}) error {
 
 	// Accumulate any errors
 	errs := common.CheckUnusedConfig(md)
-
-	if b.config.SSHPort == 0 {
-		b.config.SSHPort = 22
-	}
-
-	if b.config.RawSSHTimeout == "" {
-		b.config.RawSSHTimeout = "1m"
-	}
+	errs = packer.MultiErrorAppend(errs, b.config.AccessConfig.Prepare()...)
+	errs = packer.MultiErrorAppend(errs, b.config.RunConfig.Prepare()...)
 
 	// Accumulate any errors
-	if b.config.SourceAmi == "" {
-		errs = packer.MultiErrorAppend(
-			errs, errors.New("A source_ami must be specified"))
-	}
-
-	if b.config.InstanceType == "" {
-		errs = packer.MultiErrorAppend(
-			errs, errors.New("An instance_type must be specified"))
-	}
-
-	if b.config.Region == "" {
-		errs = packer.MultiErrorAppend(
-			errs, errors.New("A region must be specified"))
-	} else if _, ok := aws.Regions[b.config.Region]; !ok {
-		errs = packer.MultiErrorAppend(
-			errs, fmt.Errorf("Unknown region: %s", b.config.Region))
-	}
-
-	if b.config.SSHUsername == "" {
-		errs = packer.MultiErrorAppend(
-			errs, errors.New("An ssh_username must be specified"))
-	}
-
-	b.config.sshTimeout, err = time.ParseDuration(b.config.RawSSHTimeout)
-	if err != nil {
-		errs = packer.MultiErrorAppend(
-			errs, fmt.Errorf("Failed parsing ssh_timeout: %s", err))
-	}
-
 	if b.config.AMIName == "" {
 		errs = packer.MultiErrorAppend(
 			errs, errors.New("ami_name must be specified"))
@@ -123,7 +72,7 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 		panic("region not found")
 	}
 
-	auth, err := aws.GetAuth(b.config.AccessKey, b.config.SecretKey)
+	auth, err := b.config.AccessConfig.Auth()
 	if err != nil {
 		return nil, err
 	}
@@ -139,13 +88,22 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 
 	// Build the steps
 	steps := []multistep.Step{
-		&stepKeyPair{},
-		&stepSecurityGroup{},
-		&stepRunSourceInstance{},
+		&awscommon.StepKeyPair{},
+		&awscommon.StepSecurityGroup{
+			SecurityGroupId: b.config.SecurityGroupId,
+			SSHPort:         b.config.SSHPort,
+			VpcId:           b.config.VpcId,
+		},
+		&awscommon.StepRunSourceInstance{
+			ExpectedRootDevice: "ebs",
+			InstanceType:       b.config.InstanceType,
+			SourceAMI:          b.config.SourceAmi,
+			SubnetId:           b.config.SubnetId,
+		},
 		&common.StepConnectSSH{
-			SSHAddress:     sshAddress,
-			SSHConfig:      sshConfig,
-			SSHWaitTimeout: b.config.sshTimeout,
+			SSHAddress:     awscommon.SSHAddress(b.config.SSHPort),
+			SSHConfig:      awscommon.SSHConfig(b.config.SSHUsername),
+			SSHWaitTimeout: b.config.SSHTimeout(),
 		},
 		&common.StepProvision{},
 		&stepStopInstance{},
@@ -175,9 +133,10 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 	}
 
 	// Build the artifact and return it
-	artifact := &artifact{
-		amis: state["amis"].(map[string]string),
-		conn: ec2conn,
+	artifact := &awscommon.Artifact{
+		Amis:           state["amis"].(map[string]string),
+		BuilderIdValue: BuilderId,
+		Conn:           ec2conn,
 	}
 
 	return artifact, nil

builder/amazon/ebs/builder_test.go

@@ -2,19 +2,9 @@ package ebs
 
 import (
 	"github.com/mitchellh/packer/packer"
-	"os"
 	"testing"
 )
 
-func init() {
-	// Clear out the AWS access key env vars so they don't
-	// affect our tests.
-	os.Setenv("AWS_ACCESS_KEY_ID", "")
-	os.Setenv("AWS_ACCESS_KEY", "")
-	os.Setenv("AWS_SECRET_ACCESS_KEY", "")
-	os.Setenv("AWS_SECRET_KEY", "")
-}
-
 func testConfig() map[string]interface{} {
 	return map[string]interface{}{
 		"access_key":    "foo",
@@ -75,30 +65,6 @@ func TestBuilderPrepare_AMIName(t *testing.T) {
 	}
 }
 
-func TestBuilderPrepare_InstanceType(t *testing.T) {
-	var b Builder
-	config := testConfig()
-
-	// Test good
-	config["instance_type"] = "foo"
-	err := b.Prepare(config)
-	if err != nil {
-		t.Fatalf("should not have error: %s", err)
-	}
-
-	if b.config.InstanceType != "foo" {
-		t.Errorf("invalid: %s", b.config.InstanceType)
-	}
-
-	// Test bad
-	delete(config, "instance_type")
-	b = Builder{}
-	err = b.Prepare(config)
-	if err == nil {
-		t.Fatal("should have error")
-	}
-}
-
 func TestBuilderPrepare_InvalidKey(t *testing.T) {
 	var b Builder
 	config := testConfig()
@@ -110,129 +76,3 @@ func TestBuilderPrepare_InvalidKey(t *testing.T) {
 		t.Fatal("should have error")
 	}
 }
-
-func TestBuilderPrepare_Region(t *testing.T) {
-	var b Builder
-	config := testConfig()
-
-	// Test good
-	config["region"] = "us-east-1"
-	err := b.Prepare(config)
-	if err != nil {
-		t.Fatalf("should not have error: %s", err)
-	}
-
-	if b.config.Region != "us-east-1" {
-		t.Errorf("invalid: %s", b.config.Region)
-	}
-
-	// Test bad
-	delete(config, "region")
-	b = Builder{}
-	err = b.Prepare(config)
-	if err == nil {
-		t.Fatal("should have error")
-	}
-
-	// Test invalid
-	config["region"] = "i-am-not-real"
-	b = Builder{}
-	err = b.Prepare(config)
-	if err == nil {
-		t.Fatal("should have error")
-	}
-}
-
-func TestBuilderPrepare_SourceAmi(t *testing.T) {
-	var b Builder
-	config := testConfig()
-
-	// Test good
-	config["source_ami"] = "foo"
-	err := b.Prepare(config)
-	if err != nil {
-		t.Fatalf("should not have error: %s", err)
-	}
-
-	if b.config.SourceAmi != "foo" {
-		t.Errorf("invalid: %s", b.config.SourceAmi)
-	}
-
-	// Test bad
-	delete(config, "source_ami")
-	b = Builder{}
-	err = b.Prepare(config)
-	if err == nil {
-		t.Fatal("should have error")
-	}
-}
-
-func TestBuilderPrepare_SSHPort(t *testing.T) {
-	var b Builder
-	config := testConfig()
-
-	// Test default
-	err := b.Prepare(config)
-	if err != nil {
-		t.Fatalf("should not have error: %s", err)
-	}
-
-	if b.config.SSHPort != 22 {
-		t.Errorf("invalid: %d", b.config.SSHPort)
-	}
-
-	// Test set
-	config["ssh_port"] = 35
-	b = Builder{}
-	err = b.Prepare(config)
-	if err != nil {
-		t.Fatalf("should not have error: %s", err)
-	}
-
-	if b.config.SSHPort != 35 {
-		t.Errorf("invalid: %d", b.config.SSHPort)
-	}
-}
-
-func TestBuilderPrepare_SSHTimeout(t *testing.T) {
-	var b Builder
-	config := testConfig()
-
-	// Test with a bad value
-	config["ssh_timeout"] = "this is not good"
-	err := b.Prepare(config)
-	if err == nil {
-		t.Fatal("should have error")
-	}
-
-	// Test with a good one
-	config["ssh_timeout"] = "5s"
-	err = b.Prepare(config)
-	if err != nil {
-		t.Fatalf("should not have error: %s", err)
-	}
-}
-
-func TestBuilderPrepare_SSHUsername(t *testing.T) {
-	var b Builder
-	config := testConfig()
-
-	// Test good
-	config["ssh_username"] = "foo"
-	err := b.Prepare(config)
-	if err != nil {
-		t.Fatalf("should not have error: %s", err)
-	}
-
-	if b.config.SSHUsername != "foo" {
-		t.Errorf("invalid: %s", b.config.SSHUsername)
-	}
-
-	// Test bad
-	delete(config, "ssh_username")
-	b = Builder{}
-	err = b.Prepare(config)
-	if err == nil {
-		t.Fatal("should have error")
-	}
-}

builder/amazon/ebs/ssh.go

@@ -1,35 +0,0 @@
-package ebs
-
-import (
-	gossh "code.google.com/p/go.crypto/ssh"
-	"fmt"
-	"github.com/mitchellh/goamz/ec2"
-	"github.com/mitchellh/packer/communicator/ssh"
-)
-
-func sshAddress(state map[string]interface{}) (string, error) {
-	config := state["config"].(config)
-	instance := state["instance"].(*ec2.Instance)
-	if config.VpcId == "" {
-		return fmt.Sprintf("%s:%d", instance.DNSName, config.SSHPort), nil
-	} else {
-		return fmt.Sprintf("%s:%d", instance.PrivateIpAddress, config.SSHPort), nil
-	}
-}
-
-func sshConfig(state map[string]interface{}) (*gossh.ClientConfig, error) {
-	config := state["config"].(config)
-	privateKey := state["privateKey"].(string)
-
-	keyring := new(ssh.SimpleKeychain)
-	if err := keyring.AddPEMKey(privateKey); err != nil {
-		return nil, fmt.Errorf("Error setting up SSH config: %s", err)
-	}
-
-	return &gossh.ClientConfig{
-		User: config.SSHUsername,
-		Auth: []gossh.ClientAuth{
-			gossh.ClientAuthKeyring(keyring),
-		},
-	}, nil
-}

builder/amazon/ebs/step_create_ami.go

@@ -5,8 +5,8 @@ import (
 	"fmt"
 	"github.com/mitchellh/goamz/ec2"
 	"github.com/mitchellh/multistep"
+	awscommon "github.com/mitchellh/packer/builder/amazon/common"
 	"github.com/mitchellh/packer/packer"
-	"log"
 	"strconv"
 	"text/template"
 	"time"
@@ -57,23 +57,11 @@ func (s *stepCreateAMI) Run(state map[string]interface{}) multistep.StepAction {
 
 	// Wait for the image to become ready
 	ui.Say("Waiting for AMI to become ready...")
-	for {
-		imageResp, err := ec2conn.Images([]string{createResp.ImageId}, ec2.NewFilter())
-		if err != nil {
-			err := fmt.Errorf("Error querying images: %s", err)
-			state["error"] = err
-			ui.Error(err.Error())
-			return multistep.ActionHalt
-		}
-
-		if imageResp.Images[0].State == "available" {
-			break
-		}
-
-		log.Printf("Image in state %s, sleeping 2s before checking again",
-			imageResp.Images[0].State)
-
-		time.Sleep(2 * time.Second)
+	if err := awscommon.WaitForAMI(ec2conn, createResp.ImageId); err != nil {
+		err := fmt.Errorf("Error waiting for AMI: %s", err)
+		state["error"] = err
+		ui.Error(err.Error())
+		return multistep.ActionHalt
 	}
 
 	return multistep.ActionContinue

builder/amazon/ebs/step_stop_instance.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"github.com/mitchellh/goamz/ec2"
 	"github.com/mitchellh/multistep"
+	awscommon "github.com/mitchellh/packer/builder/amazon/common"
 	"github.com/mitchellh/packer/packer"
 )
 
@@ -26,7 +27,7 @@ func (s *stepStopInstance) Run(state map[string]interface{}) multistep.StepActio
 
 	// Wait for the instance to actual stop
 	ui.Say("Waiting for the instance to stop...")
-	instance, err = waitForState(ec2conn, instance, []string{"running", "stopping"}, "stopped")
+	instance, err = awscommon.WaitForState(ec2conn, instance, []string{"running", "stopping"}, "stopped")
 	if err != nil {
 		err := fmt.Errorf("Error waiting for instance to stop: %s", err)
 		state["error"] = err

builder/amazon/instance/builder.go

@@ -0,0 +1,219 @@
+// The instance package contains a packer.Builder implementation that builds
+// AMIs for Amazon EC2 backed by instance storage, as opposed to EBS storage.
+package instance
+
+import (
+	"errors"
+	"fmt"
+	"github.com/mitchellh/goamz/aws"
+	"github.com/mitchellh/goamz/ec2"
+	"github.com/mitchellh/multistep"
+	awscommon "github.com/mitchellh/packer/builder/amazon/common"
+	"github.com/mitchellh/packer/builder/common"
+	"github.com/mitchellh/packer/packer"
+	"log"
+	"os"
+	"strings"
+	"text/template"
+)
+
+// The unique ID for this builder
+const BuilderId = "mitchellh.amazon.instance"
+
+// Config is the configuration that is chained through the steps and
+// settable from the template.
+type Config struct {
+	common.PackerConfig    `mapstructure:",squash"`
+	awscommon.AccessConfig `mapstructure:",squash"`
+	awscommon.RunConfig    `mapstructure:",squash"`
+
+	AccountId           string `mapstructure:"account_id"`
+	AMIName             string `mapstructure:"ami_name"`
+	BundleDestination   string `mapstructure:"bundle_destination"`
+	BundlePrefix        string `mapstructure:"bundle_prefix"`
+	BundleUploadCommand string `mapstructure:"bundle_upload_command"`
+	BundleVolCommand    string `mapstructure:"bundle_vol_command"`
+	S3Bucket            string `mapstructure:"s3_bucket"`
+	X509CertPath        string `mapstructure:"x509_cert_path"`
+	X509KeyPath         string `mapstructure:"x509_key_path"`
+	X509UploadPath      string `mapstructure:"x509_upload_path"`
+}
+
+type Builder struct {
+	config Config
+	runner multistep.Runner
+}
+
+func (b *Builder) Prepare(raws ...interface{}) error {
+	md, err := common.DecodeConfig(&b.config, raws...)
+	if err != nil {
+		return err
+	}
+
+	if b.config.BundleDestination == "" {
+		b.config.BundleDestination = "/tmp"
+	}
+
+	if b.config.BundlePrefix == "" {
+		b.config.BundlePrefix = "image-{{.CreateTime}}"
+	}
+
+	if b.config.BundleUploadCommand == "" {
+		b.config.BundleUploadCommand = "sudo -n ec2-upload-bundle " +
+			"-b {{.BucketName}} " +
+			"-m {{.ManifestPath}} " +
+			"-a {{.AccessKey}} " +
+			"-s {{.SecretKey}} " +
+			"-d {{.BundleDirectory}} " +
+			"--batch " +
+			"--retry"
+	}
+
+	if b.config.BundleVolCommand == "" {
+		b.config.BundleVolCommand = "sudo -n ec2-bundle-vol " +
+			"-k {{.KeyPath}} " +
+			"-u {{.AccountId}} " +
+			"-c {{.CertPath}} " +
+			"-r {{.Architecture}} " +
+			"-e {{.PrivatePath}} " +
+			"-d {{.Destination}} " +
+			"-p {{.Prefix}} " +
+			"--batch"
+	}
+
+	if b.config.X509UploadPath == "" {
+		b.config.X509UploadPath = "/tmp"
+	}
+
+	// Accumulate any errors
+	errs := common.CheckUnusedConfig(md)
+	errs = packer.MultiErrorAppend(errs, b.config.AccessConfig.Prepare()...)
+	errs = packer.MultiErrorAppend(errs, b.config.RunConfig.Prepare()...)
+
+	if b.config.AccountId == "" {
+		errs = packer.MultiErrorAppend(errs, errors.New("account_id is required"))
+	} else {
+		b.config.AccountId = strings.Replace(b.config.AccountId, "-", "", -1)
+	}
+
+	if b.config.AMIName == "" {
+		errs = packer.MultiErrorAppend(
+			errs, errors.New("ami_name must be specified"))
+	} else {
+		_, err = template.New("ami").Parse(b.config.AMIName)
+		if err != nil {
+			errs = packer.MultiErrorAppend(
+				errs, fmt.Errorf("Failed parsing ami_name: %s", err))
+		}
+	}
+
+	if b.config.S3Bucket == "" {
+		errs = packer.MultiErrorAppend(errs, errors.New("s3_bucket is required"))
+	}
+
+	if b.config.X509CertPath == "" {
+		errs = packer.MultiErrorAppend(errs, errors.New("x509_cert_path is required"))
+	} else if _, err := os.Stat(b.config.X509CertPath); err != nil {
+		errs = packer.MultiErrorAppend(
+			errs, fmt.Errorf("x509_cert_path points to bad file: %s", err))
+	}
+
+	if b.config.X509KeyPath == "" {
+		errs = packer.MultiErrorAppend(errs, errors.New("x509_key_path is required"))
+	} else if _, err := os.Stat(b.config.X509KeyPath); err != nil {
+		errs = packer.MultiErrorAppend(
+			errs, fmt.Errorf("x509_key_path points to bad file: %s", err))
+	}
+
+	if errs != nil && len(errs.Errors) > 0 {
+		return errs
+	}
+
+	log.Printf("Config: %+v", b.config)
+	return nil
+}
+
+func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packer.Artifact, error) {
+	region, ok := aws.Regions[b.config.Region]
+	if !ok {
+		panic("region not found")
+	}
+
+	auth, err := b.config.AccessConfig.Auth()
+	if err != nil {
+		return nil, err
+	}
+
+	ec2conn := ec2.New(auth, region)
+
+	// Setup the state bag and initial state for the steps
+	state := make(map[string]interface{})
+	state["config"] = &b.config
+	state["ec2"] = ec2conn
+	state["hook"] = hook
+	state["ui"] = ui
+
+	// Build the steps
+	steps := []multistep.Step{
+		&awscommon.StepKeyPair{},
+		&awscommon.StepSecurityGroup{
+			SecurityGroupId: b.config.SecurityGroupId,
+			SSHPort:         b.config.SSHPort,
+			VpcId:           b.config.VpcId,
+		},
+		&awscommon.StepRunSourceInstance{
+			ExpectedRootDevice: "instance-store",
+			InstanceType:       b.config.InstanceType,
+			SourceAMI:          b.config.SourceAmi,
+			SubnetId:           b.config.SubnetId,
+		},
+		&common.StepConnectSSH{
+			SSHAddress:     awscommon.SSHAddress(b.config.SSHPort),
+			SSHConfig:      awscommon.SSHConfig(b.config.SSHUsername),
+			SSHWaitTimeout: b.config.SSHTimeout(),
+		},
+		&common.StepProvision{},
+		&StepUploadX509Cert{},
+		&StepBundleVolume{},
+		&StepUploadBundle{},
+		&StepRegisterAMI{},
+	}
+
+	// Run!
+	if b.config.PackerDebug {
+		b.runner = &multistep.DebugRunner{
+			Steps:   steps,
+			PauseFn: common.MultistepDebugFn(ui),
+		}
+	} else {
+		b.runner = &multistep.BasicRunner{Steps: steps}
+	}
+
+	b.runner.Run(state)
+
+	// If there was an error, return that
+	if rawErr, ok := state["error"]; ok {
+		return nil, rawErr.(error)
+	}
+
+	// If there are no AMIs, then just return
+	if _, ok := state["amis"]; !ok {
+		return nil, nil
+	}
+
+	// Build the artifact and return it
+	artifact := &awscommon.Artifact{
+		Amis:           state["amis"].(map[string]string),
+		BuilderIdValue: BuilderId,
+		Conn:           ec2conn,
+	}
+
+	return artifact, nil
+}
+
+func (b *Builder) Cancel() {
+	if b.runner != nil {
+		log.Println("Cancelling the step runner...")
+		b.runner.Cancel()
+	}
+}

builder/amazon/instance/builder_test.go

@@ -0,0 +1,219 @@
+package instance
+
+import (
+	"github.com/mitchellh/packer/packer"
+	"io/ioutil"
+	"os"
+	"testing"
+)
+
+func testConfig() map[string]interface{} {
+	tf, err := ioutil.TempFile("", "packer")
+	if err != nil {
+		panic(err)
+	}
+
+	return map[string]interface{}{
+		"account_id":       "foo",
+		"ami_name":         "foo",
+		"instance_type":    "m1.small",
+		"region":           "us-east-1",
+		"s3_bucket":        "foo",
+		"source_ami":       "foo",
+		"ssh_username":     "bob",
+		"x509_cert_path":   tf.Name(),
+		"x509_key_path":    tf.Name(),
+		"x509_upload_path": "/foo",
+	}
+}
+
+func TestBuilder_ImplementsBuilder(t *testing.T) {
+	var raw interface{}
+	raw = &Builder{}
+	if _, ok := raw.(packer.Builder); !ok {
+		t.Fatalf("Builder should be a builder")
+	}
+}
+
+func TestBuilderPrepare_AccountId(t *testing.T) {
+	b := &Builder{}
+	config := testConfig()
+
+	config["account_id"] = ""
+	err := b.Prepare(config)
+	if err == nil {
+		t.Fatal("should have error")
+	}
+
+	config["account_id"] = "foo"
+	err = b.Prepare(config)
+	if err != nil {
+		t.Errorf("err: %s", err)
+	}
+
+	config["account_id"] = "0123-0456-7890"
+	err = b.Prepare(config)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if b.config.AccountId != "012304567890" {
+		t.Errorf("should strip hyphens: %s", b.config.AccountId)
+	}
+}
+
+func TestBuilderPrepare_AMIName(t *testing.T) {
+	var b Builder
+	config := testConfig()
+
+	// Test good
+	config["ami_name"] = "foo"
+	err := b.Prepare(config)
+	if err != nil {
+		t.Fatalf("should not have error: %s", err)
+	}
+
+	// Test bad
+	config["ami_name"] = "foo {{"
+	b = Builder{}
+	err = b.Prepare(config)
+	if err == nil {
+		t.Fatal("should have error")
+	}
+
+	// Test bad
+	delete(config, "ami_name")
+	b = Builder{}
+	err = b.Prepare(config)
+	if err == nil {
+		t.Fatal("should have error")
+	}
+}
+
+func TestBuilderPrepare_BundleDestination(t *testing.T) {
+	b := &Builder{}
+	config := testConfig()
+
+	config["bundle_destination"] = ""
+	err := b.Prepare(config)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if b.config.BundleDestination != "/tmp" {
+		t.Fatalf("bad: %s", b.config.BundleDestination)
+	}
+}
+
+func TestBuilderPrepare_BundlePrefix(t *testing.T) {
+	b := &Builder{}
+	config := testConfig()
+
+	config["bundle_prefix"] = ""
+	err := b.Prepare(config)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if b.config.BundlePrefix != "image-{{.CreateTime}}" {
+		t.Fatalf("bad: %s", b.config.BundlePrefix)
+	}
+}
+
+func TestBuilderPrepare_InvalidKey(t *testing.T) {
+	var b Builder
+	config := testConfig()
+
+	// Add a random key
+	config["i_should_not_be_valid"] = true
+	err := b.Prepare(config)
+	if err == nil {
+		t.Fatal("should have error")
+	}
+}
+
+func TestBuilderPrepare_S3Bucket(t *testing.T) {
+	b := &Builder{}
+	config := testConfig()
+
+	config["s3_bucket"] = ""
+	err := b.Prepare(config)
+	if err == nil {
+		t.Fatal("should have error")
+	}
+
+	config["s3_bucket"] = "foo"
+	err = b.Prepare(config)
+	if err != nil {
+		t.Errorf("err: %s", err)
+	}
+}
+
+func TestBuilderPrepare_X509CertPath(t *testing.T) {
+	b := &Builder{}
+	config := testConfig()
+
+	config["x509_cert_path"] = ""
+	err := b.Prepare(config)
+	if err == nil {
+		t.Fatal("should have error")
+	}
+
+	config["x509_cert_path"] = "i/am/a/file/that/doesnt/exist"
+	err = b.Prepare(config)
+	if err == nil {
+		t.Error("should have error")
+	}
+
+	tf, err := ioutil.TempFile("", "packer")
+	if err != nil {
+		t.Fatalf("error tempfile: %s", err)
+	}
+	defer os.Remove(tf.Name())
+
+	config["x509_cert_path"] = tf.Name()
+	err = b.Prepare(config)
+	if err != nil {
+		t.Fatalf("should not have error: %s", err)
+	}
+}
+
+func TestBuilderPrepare_X509KeyPath(t *testing.T) {
+	b := &Builder{}
+	config := testConfig()
+
+	config["x509_key_path"] = ""
+	err := b.Prepare(config)
+	if err == nil {
+		t.Fatal("should have error")
+	}
+
+	config["x509_key_path"] = "i/am/a/file/that/doesnt/exist"
+	err = b.Prepare(config)
+	if err == nil {
+		t.Error("should have error")
+	}
+
+	tf, err := ioutil.TempFile("", "packer")
+	if err != nil {
+		t.Fatalf("error tempfile: %s", err)
+	}
+	defer os.Remove(tf.Name())
+
+	config["x509_key_path"] = tf.Name()
+	err = b.Prepare(config)
+	if err != nil {
+		t.Fatalf("should not have error: %s", err)
+	}
+}
+
+func TestBuilderPrepare_X509UploadPath(t *testing.T) {
+	b := &Builder{}
+	config := testConfig()
+
+	config["x509_upload_path"] = ""
+	err := b.Prepare(config)
+	if err != nil {
+		t.Fatalf("should not have error: %s", err)
+	}
+}

builder/amazon/instance/step_bundle_volume.go

@@ -0,0 +1,104 @@
+package instance
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/mitchellh/goamz/ec2"
+	"github.com/mitchellh/multistep"
+	"github.com/mitchellh/packer/packer"
+	"strconv"
+	"text/template"
+	"time"
+)
+
+type bundleCmdData struct {
+	AccountId    string
+	Architecture string
+	CertPath     string
+	Destination  string
+	KeyPath      string
+	Prefix       string
+	PrivatePath  string
+}
+
+type bundlePrefixData struct {
+	CreateTime string
+}
+
+type StepBundleVolume struct{}
+
+func (s *StepBundleVolume) Run(state map[string]interface{}) multistep.StepAction {
+	comm := state["communicator"].(packer.Communicator)
+	config := state["config"].(*Config)
+	instance := state["instance"].(*ec2.Instance)
+	ui := state["ui"].(packer.Ui)
+	x509RemoteCertPath := state["x509RemoteCertPath"].(string)
+	x509RemoteKeyPath := state["x509RemoteKeyPath"].(string)
+
+	// Verify the AMI tools are available
+	ui.Say("Checking for EC2 AMI tools...")
+	cmd := &packer.RemoteCmd{Command: "ec2-ami-tools-version"}
+	if err := comm.Start(cmd); err != nil {
+		state["error"] = fmt.Errorf("Error checking for AMI tools: %s", err)
+		ui.Error(state["error"].(error).Error())
+		return multistep.ActionHalt
+	}
+	cmd.Wait()
+
+	if cmd.ExitStatus != 0 {
+		state["error"] = fmt.Errorf(
+			"The EC2 AMI tools could not be detected. These must be manually\n" +
+				"via a provisioner or some other means and are required for Packer\n" +
+				"to create an instance-store AMI.")
+		ui.Error(state["error"].(error).Error())
+		return multistep.ActionHalt
+	}
+
+	// Bundle the volume
+	var bundlePrefix bytes.Buffer
+	prefixTData := bundlePrefixData{
+		CreateTime: strconv.FormatInt(time.Now().UTC().Unix(), 10),
+	}
+	t := template.Must(template.New("bundlePrefix").Parse(config.BundlePrefix))
+	t.Execute(&bundlePrefix, prefixTData)
+
+	var bundleCmd bytes.Buffer
+	tData := bundleCmdData{
+		AccountId:    config.AccountId,
+		Architecture: instance.Architecture,
+		CertPath:     x509RemoteCertPath,
+		Destination:  config.BundleDestination,
+		KeyPath:      x509RemoteKeyPath,
+		Prefix:       bundlePrefix.String(),
+		PrivatePath:  config.X509UploadPath,
+	}
+	t = template.Must(template.New("bundleCmd").Parse(config.BundleVolCommand))
+	t.Execute(&bundleCmd, tData)
+
+	ui.Say("Bundling the volume...")
+	cmd = new(packer.RemoteCmd)
+	cmd.Command = bundleCmd.String()
+	if err := cmd.StartWithUi(comm, ui); err != nil {
+		state["error"] = fmt.Errorf("Error bundling volume: %s", err)
+		ui.Error(state["error"].(error).Error())
+		return multistep.ActionHalt
+	}
+
+	if cmd.ExitStatus != 0 {
+		state["error"] = fmt.Errorf(
+			"Volume bundling failed. Please see the output above for more\n" +
+				"details on what went wrong.")
+		ui.Error(state["error"].(error).Error())
+		return multistep.ActionHalt
+	}
+
+	// Store the manifest path
+	manifestName := bundlePrefix.String() + ".manifest.xml"
+	state["manifest_name"] = manifestName
+	state["manifest_path"] = fmt.Sprintf(
+		"%s/%s", config.BundleDestination, manifestName)
+
+	return multistep.ActionContinue
+}
+
+func (s *StepBundleVolume) Cleanup(map[string]interface{}) {}

builder/amazon/instance/step_register_ami.go

@@ -0,0 +1,68 @@
+package instance
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/mitchellh/goamz/ec2"
+	"github.com/mitchellh/multistep"
+	awscommon "github.com/mitchellh/packer/builder/amazon/common"
+	"github.com/mitchellh/packer/packer"
+	"strconv"
+	"text/template"
+	"time"
+)
+
+type amiNameData struct {
+	CreateTime string
+}
+
+type StepRegisterAMI struct{}
+
+func (s *StepRegisterAMI) Run(state map[string]interface{}) multistep.StepAction {
+	config := state["config"].(*Config)
+	ec2conn := state["ec2"].(*ec2.EC2)
+	manifestPath := state["remote_manifest_path"].(string)
+	ui := state["ui"].(packer.Ui)
+
+	// Parse the name of the AMI
+	amiNameBuf := new(bytes.Buffer)
+	tData := amiNameData{
+		strconv.FormatInt(time.Now().UTC().Unix(), 10),
+	}
+
+	t := template.Must(template.New("ami").Parse(config.AMIName))
+	t.Execute(amiNameBuf, tData)
+	amiName := amiNameBuf.String()
+
+	ui.Say("Registering the AMI...")
+	registerOpts := &ec2.RegisterImage{
+		ImageLocation: manifestPath,
+		Name:          amiName,
+	}
+
+	registerResp, err := ec2conn.RegisterImage(registerOpts)
+	if err != nil {
+		state["error"] = fmt.Errorf("Error registering AMI: %s", err)
+		ui.Error(state["error"].(error).Error())
+		return multistep.ActionHalt
+	}
+
+	// Set the AMI ID in the state
+	ui.Say(fmt.Sprintf("AMI: %s", registerResp.ImageId))
+	amis := make(map[string]string)
+	amis[config.Region] = registerResp.ImageId
+	state["amis"] = amis
+
+	// Wait for the image to become ready
+	ui.Say("Waiting for AMI to become ready...")
+	if err := awscommon.WaitForAMI(ec2conn, registerResp.ImageId); err != nil {
+		err := fmt.Errorf("Error waiting for AMI: %s", err)
+		state["error"] = err
+		ui.Error(err.Error())
+		return multistep.ActionHalt
+	}
+
+	return multistep.ActionContinue
+}
+
+func (s *StepRegisterAMI) Cleanup(map[string]interface{}) {}

builder/amazon/instance/step_upload_bundle.go

@@ -0,0 +1,61 @@
+package instance
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/mitchellh/multistep"
+	"github.com/mitchellh/packer/packer"
+	"text/template"
+)
+
+type uploadCmdData struct {
+	AccessKey       string
+	BucketName      string
+	BundleDirectory string
+	ManifestPath    string
+	SecretKey       string
+}
+
+type StepUploadBundle struct{}
+
+func (s *StepUploadBundle) Run(state map[string]interface{}) multistep.StepAction {
+	comm := state["communicator"].(packer.Communicator)
+	config := state["config"].(*Config)
+	manifestName := state["manifest_name"].(string)
+	manifestPath := state["manifest_path"].(string)
+	ui := state["ui"].(packer.Ui)
+
+	var uploadCmd bytes.Buffer
+	tData := uploadCmdData{
+		AccessKey:       config.AccessKey,
+		BucketName:      config.S3Bucket,
+		BundleDirectory: config.BundleDestination,
+		ManifestPath:    manifestPath,
+		SecretKey:       config.SecretKey,
+	}
+	t := template.Must(template.New("uploadCmd").Parse(config.BundleUploadCommand))
+	t.Execute(&uploadCmd, tData)
+
+	ui.Say("Uploading the bundle...")
+	cmd := &packer.RemoteCmd{Command: uploadCmd.String()}
+	if err := cmd.StartWithUi(comm, ui); err != nil {
+		state["error"] = fmt.Errorf("Error uploading volume: %s", err)
+		ui.Error(state["error"].(error).Error())
+		return multistep.ActionHalt
+	}
+
+	if cmd.ExitStatus != 0 {
+		state["error"] = fmt.Errorf(
+			"Bundle upload failed. Please see the output above for more\n" +
+				"details on what went wrong.")
+		ui.Error(state["error"].(error).Error())
+		return multistep.ActionHalt
+	}
+
+	state["remote_manifest_path"] = fmt.Sprintf(
+		"%s/%s", config.S3Bucket, manifestName)
+
+	return multistep.ActionContinue
+}
+
+func (s *StepUploadBundle) Cleanup(state map[string]interface{}) {}

builder/amazon/instance/step_upload_x509_cert.go

@@ -0,0 +1,49 @@
+package instance
+
+import (
+	"fmt"
+	"github.com/mitchellh/multistep"
+	"github.com/mitchellh/packer/packer"
+	"os"
+)
+
+type StepUploadX509Cert struct{}
+
+func (s *StepUploadX509Cert) Run(state map[string]interface{}) multistep.StepAction {
+	comm := state["communicator"].(packer.Communicator)
+	config := state["config"].(*Config)
+	ui := state["ui"].(packer.Ui)
+
+	x509RemoteCertPath := config.X509UploadPath + "/cert.pem"
+	x509RemoteKeyPath := config.X509UploadPath + "/key.pem"
+
+	ui.Say("Uploading X509 Certificate...")
+	if err := s.uploadSingle(comm, x509RemoteCertPath, config.X509CertPath); err != nil {
+		state["error"] = fmt.Errorf("Error uploading X509 cert: %s", err)
+		ui.Error(state["error"].(error).Error())
+		return multistep.ActionHalt
+	}
+
+	if err := s.uploadSingle(comm, x509RemoteKeyPath, config.X509KeyPath); err != nil {
+		state["error"] = fmt.Errorf("Error uploading X509 cert: %s", err)
+		ui.Error(state["error"].(error).Error())
+		return multistep.ActionHalt
+	}
+
+	state["x509RemoteCertPath"] = x509RemoteCertPath
+	state["x509RemoteKeyPath"] = x509RemoteKeyPath
+
+	return multistep.ActionContinue
+}
+
+func (s *StepUploadX509Cert) Cleanup(map[string]interface{}) {}
+
+func (s *StepUploadX509Cert) uploadSingle(comm packer.Communicator, dst, src string) error {
+	f, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	return comm.Upload(dst, f)
+}

builder/common/packer_config.go

@@ -0,0 +1,10 @@
+package common
+
+// PackerConfig is a struct that contains the configuration keys that
+// are sent by packer, properly tagged already so mapstructure can load
+// them. Embed this structure into your configuration class to get it.
+type PackerConfig struct {
+	PackerBuildName string `mapstructure:"packer_build_name"`
+	PackerDebug     bool   `mapstructure:"packer_debug"`
+	PackerForce     bool   `mapstructure:"packer_force"`
+}

builder/digitalocean/builder.go

@@ -28,6 +28,8 @@ type snapshotNameData struct {
 // to use while communicating with DO and describes the image
 // you are creating
 type config struct {
+	common.PackerConfig `mapstructure:",squash"`
+
 	ClientID string `mapstructure:"client_id"`
 	APIKey   string `mapstructure:"api_key"`
 	RegionID uint   `mapstructure:"region_id"`
@@ -38,8 +40,6 @@ type config struct {
 	SSHUsername  string `mapstructure:"ssh_username"`
 	SSHPort      uint   `mapstructure:"ssh_port"`
 
-	PackerDebug bool `mapstructure:"packer_debug"`
-
 	RawSnapshotName string `mapstructure:"snapshot_name"`
 	RawSSHTimeout   string `mapstructure:"ssh_timeout"`
 	RawEventDelay   string `mapstructure:"event_delay"`

builder/virtualbox/builder.go

@@ -24,6 +24,8 @@ type Builder struct {
 }
 
 type config struct {
+	common.PackerConfig `mapstructure:",squash"`
+
 	BootCommand          []string   `mapstructure:"boot_command"`
 	DiskSize             uint       `mapstructure:"disk_size"`
 	FloppyFiles          []string   `mapstructure:"floppy_files"`
@@ -49,10 +51,6 @@ type config struct {
 	VBoxManage           [][]string `mapstructure:"vboxmanage"`
 	VMName               string     `mapstructure:"vm_name"`
 
-	PackerBuildName string `mapstructure:"packer_build_name"`
-	PackerDebug     bool   `mapstructure:"packer_debug"`
-	PackerForce     bool   `mapstructure:"packer_force"`
-
 	RawBootWait        string `mapstructure:"boot_wait"`
 	RawShutdownTimeout string `mapstructure:"shutdown_timeout"`
 	RawSSHWaitTimeout  string `mapstructure:"ssh_wait_timeout"`

builder/vmware/builder.go

@@ -25,6 +25,8 @@ type Builder struct {
 }
 
 type config struct {
+	common.PackerConfig `mapstructure:",squash"`
+
 	DiskName          string            `mapstructure:"vmdk_name"`
 	DiskSize          uint              `mapstructure:"disk_size"`
 	FloppyFiles       []string          `mapstructure:"floppy_files"`
@@ -50,10 +52,6 @@ type config struct {
 	VNCPortMin        uint              `mapstructure:"vnc_port_min"`
 	VNCPortMax        uint              `mapstructure:"vnc_port_max"`
 
-	PackerBuildName string `mapstructure:"packer_build_name"`
-	PackerDebug     bool   `mapstructure:"packer_debug"`
-	PackerForce     bool   `mapstructure:"packer_force"`
-
 	RawBootWait        string `mapstructure:"boot_wait"`
 	RawShutdownTimeout string `mapstructure:"shutdown_timeout"`
 	RawSSHWaitTimeout  string `mapstructure:"ssh_wait_timeout"`

config.go

@@ -20,6 +20,7 @@ const defaultConfig = `
 
 	"builders": {
 		"amazon-ebs": "packer-builder-amazon-ebs",
+		"amazon-instance": "packer-builder-amazon-instance",
 		"digitalocean": "packer-builder-digitalocean",
 		"virtualbox": "packer-builder-virtualbox",
 		"vmware": "packer-builder-vmware"

plugin/builder-amazon-instance/main.go

@@ -0,0 +1,10 @@
+package main
+
+import (
+	"github.com/mitchellh/packer/builder/amazon/instance"
+	"github.com/mitchellh/packer/packer/plugin"
+)
+
+func main() {
+	plugin.ServeBuilder(new(instance.Builder))
+}

website/source/docs/builders/amazon-ebs.html.markdown

@@ -1,22 +1,17 @@
 ---
 layout: "docs"
+page_title: "Amazon AMI Builder (EBS backed)"
 ---
 
-# Amazon AMI Builder
+# AMI Builder (EBS backed)
 
 Type: `amazon-ebs`
 
 The `amazon-ebs` builder is able to create Amazon AMIs backed by EBS
-volumes for use in [EC2](http://aws.amazon.com/ec2/). The builder takes
-an initial source AMI, runs any provisioning necesary on the instance,
-and snapshots it into a reusable AMI.
-
-Amazon supports two types of AMIs: EBS-backed and instance-store. Instance
-store AMIs are considerably harder to create, requiring many platform-specific
-steps that can often take a very long time. EBS-backed AMIs, on the hand,
-only require a source AMI to exist. This builder only builds EBS-backed
-instances, because they are easier to create, especially across many
-platforms running Packer.
+volumes for use in [EC2](http://aws.amazon.com/ec2/). For more information
+on the difference betwen EBS-backed instances and instance-store backed
+instances, see the
+["storage for the root device" section in the EC2 documentation](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ComponentsAMIs.html#storage-for-the-root-device).
 
 This builder builds an AMI by launching an EC2 instance from a source AMI,
 provisioning that running machine, and then creating an AMI from that machine.

website/source/docs/builders/amazon-instance.html.markdown

@@ -0,0 +1,217 @@
+---
+layout: "docs"
+page_title: "Amazon AMI Builder (instance-store)"
+---
+
+# AMI Builder (instance-store)
+
+Type: `amazon-instance`
+
+The `amazon-instance` builder is able to create Amazon AMIs backed by
+instance storage as the root device. For more information on the difference
+between instance storage and EBS-backed instances, see the
+["storage for the root device" section in the EC2 documentation](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ComponentsAMIs.html#storage-for-the-root-device).
+
+This builder builds an AMI by launching an EC2 instance from an existing
+instance-storage backed AMI, provisioning that running machine, and then
+bundling and creating a new AMI from that machine.
+This is all done in your own AWS account. The builder will create temporary
+keypairs, security group rules, etc. that provide it temporary access to
+the instance while the image is being created. This simplifies configuration
+quite a bit.
+
+The builder does _not_ manage AMIs. Once it creates an AMI and stores it
+in your account, it is up to you to use, delete, etc. the AMI.
+
+## Configuration Reference
+
+There are many configuration options available for the builder. They are
+segmented below into two categories: required and optional parameters. Within
+each category, the available configuration keys are alphabetized.
+
+Required:
+
+* `access_key` (string) - The access key used to communicate with AWS.
+  If not specified, Packer will attempt to read this from environmental
+  variables `AWS_ACCESS_KEY_ID` or `AWS_ACCESS_KEY` (in that order).
+
+* `account_id` (string) - Your AWS account ID. This is required for bundling
+  the AMI. This is _not the same_ as the access key. You can find your
+  account ID in the security credentials page of your AWS account.
+
+* `ami_name` (string) - The name of the resulting AMI that will appear
+  when managing AMIs in the AWS console or via APIs. This must be unique.
+  To help make this unique, certain template parameters are available for
+  this value, which are documented below.
+
+* `instance_type` (string) - The EC2 instance type to use while building
+  the AMI, such as "m1.small".
+
+* `region` (string) - The name of the region, such as "us-east-1", in which
+  to launch the EC2 instance to create the AMI.
+
+* `s3_bucket` (string) - The name of the S3 bucket to upload the AMI.
+  This bucket will be created if it doesn't exist.
+
+* `secret_key` (string) - The secret key used to communicate with AWS.
+  If not specified, Packer will attempt to read this from environmental
+  variables `AWS_SECRET_ACCESS_KEY` or `AWS_SECRET_KEY` (in that order).
+
+* `source_ami` (string) - The initial AMI used as a base for the newly
+  created machine.
+
+* `ssh_username` (string) - The username to use in order to communicate
+  over SSH to the running machine.
+
+* `x509_cert_path` (string) - The local path to a valid X509 certificate for
+  your AWS account. This is used for bundling the AMI. This X509 certificate
+  must be registered with your account from the security credentials page
+  in the AWS console.
+
+* `x509_key_path` (string) - The local path to the private key for the X509
+  certificate specified by `x509_cert_path`. This is used for bundling the AMI.
+
+Optional:
+
+* `bundle_destination` (string) - The directory on the running instance
+  where the bundled AMI will be saved prior to uploading. By default this is
+  "/tmp". This directory must exist and be writable.
+
+* `bundle_prefix` (string) - The prefix for files created from bundling
+  the root volume. By default this is "image-{{.Createtime}}". The `CreateTime`
+  variable should be used to make sure this is unique, otherwise it can
+  collide with other created AMIs by Packer in your account.
+
+* `bundle_upload_command` (string) - The command to use to upload the
+  bundled volume. See the "custom bundle commands" section below for more
+  information.
+
+* `bundle_vol_command` (string) - The command to use to bundle the volume.
+  See the "custom bundle commands" section below for more information.
+
+* `security_group_id` (string) - The ID (_not_ the name) of the security
+  group to assign to the instance. By default this is not set and Packer
+  will automatically create a new temporary security group to allow SSH
+  access. Note that if this is specified, you must be sure the security
+  group allows access to the `ssh_port` given below.
+
+* `ssh_port` (int) - The port that SSH will be available on. This defaults
+  to port 22.
+
+* `ssh_timeout` (string) - The time to wait for SSH to become available
+  before timing out. The format of this value is a duration such as "5s"
+  or "5m". The default SSH timeout is "1m", or one minute.
+
+* `subnet_id` (string) - If using VPC, the ID of the subnet, such as
+  "subnet-12345def", where Packer will launch the EC2 instance.
+
+* `vpc_id` (string) - If launching into a VPC subnet, Packer needs the
+  VPC ID in order to create a temporary security group within the VPC.
+
+* `x509_upload_path` (string) - The path on the remote machine where the
+  X509 certificate will be uploaded. This path must already exist and be
+  writable. X509 certificates are uploaded after provisioning is run, so
+  it is perfectly okay to create this directory as part of the provisioning
+  process.
+
+## Basic Example
+
+Here is a basic example. It is completely valid except for the access keys:
+
+<pre class="prettyprint">
+{
+  "type": "amazon-instance",
+  "access_key": "YOUR KEY HERE",
+  "secret_key": "YOUR SECRET KEY HERE",
+  "region": "us-east-1",
+  "source_ami": "ami-d9d6a6b0",
+  "instance_type": "m1.small",
+  "ssh_username": "ubuntu",
+
+  "account_id": "0123-4567-0890",
+  "s3_bucket": "packer-images",
+  "x509_cert_path": "x509.cert",
+  "x509_key_path": "x509.key",
+  "x509_upload_path": "/tmp",
+
+  "ami_name": "packer-quick-start {{.CreateTime}}"
+}
+</pre>
+
+<div class="alert alert-block alert-info">
+<strong>Note:</strong> Packer can also read the access key and secret
+access key from environmental variables. See the configuration reference in
+the section above for more information on what environmental variables Packer
+will look for.
+</div>
+
+## AMI Name Variables
+
+The AMI name specified by the `ami_name` configuration variable is actually
+treated as a [configuration template](/docs/templates/configuration-templates.html).
+Packer provides a set of variables that it will replace
+within the AMI name. This helps ensure the AMI name is unique, as AWS requires.
+
+The available variables are shown below:
+
+* `CreateTime` - This will be replaced with the Unix timestamp of when
+  the AMI was built.
+
+## Custom Bundle Commands
+
+A lot of the process required for creating an instance-store backed AMI
+involves commands being run on the actual source instance. Specifically, the
+`ec2-bundle-vol` and `ec2-upload-bundle` commands must be used to bundle
+the root filesystem and upload it, respectively.
+
+Each of these commands have a lot of available flags. Instead of exposing each
+possible flag as a template configuration option, the instance-store AMI
+builder for Packer lets you customize the entire command used to bundle
+and upload the AMI.
+
+These are configured with `bundle_vol_command` and `bundle_upload_command`.
+Both of these configurations are
+[configuration templates](/docs/templates/configuration-templates.html)
+and have support for their own set of template variables.
+
+### Bundle Volume Command
+
+The default value for `bundle_vol_command` is shown below. It is split
+across multiple lines for convenience of reading. The bundle volume command
+is responsible for executing `ec2-bundle-vol` in order to store and image
+of the root filesystem to use to create the AMI.
+
+```
+sudo -n ec2-bundle-vol \
+	-k {{.KeyPath}}  \
+	-u {{.AccountId}} \
+	-c {{.CertPath}} \
+	-r {{.Architecture}} \
+	-e {{.PrivatePath}} \
+	-d {{.Destination}} \
+	-p {{.Prefix}} \
+	--batch
+```
+
+The available template variables should be self-explanatory based on the
+parameters they're used to satisfy the `ec2-bundle-vol` command.
+
+### Bundle Upload Command
+
+The default value for `bundle_upload_command` is shown below. It is split
+across multiple lines for convenience of reading. The bundle upload command
+is responsible for taking the bundled volume and uploading it to S3.
+
+```
+sudo -n ec2-upload-bundle \
+	-b {{.BucketName}} \
+	-m {{.ManifestPath}} \
+	-a {{.AccessKey}} \
+	-s {{.SecretKey}} \
+	-d {{.BundleDirectory}} \
+	--batch \
+	--retry
+```
+
+The available template variables should be self-explanatory based on the
+parameters they're used to satisfy the `ec2-upload-bundle` command.

website/source/docs/builders/amazon.html.markdown

@@ -0,0 +1,25 @@
+---
+layout: "docs"
+page_title: "Amazon AMI Builder"
+---
+
+# Amazon AMI Builder
+
+Packer is able to create Amazon AMIs. To achieve this, Packer comes with
+multiple builders depending on the strategy you want to use to build the
+AMI. Packer supports the following builders at the moment:
+
+* [amazon-ebs](/docs/builders/amazon-ebs.html) - Create EBS-backed AMIs
+  by launching a source instance and re-packaging it into a new AMI after
+  provisioning. If in doubt, use this builder, which is the easiest to get
+  started with.
+
+* [amazon-instance](/docs/builders/amazon-instance.html) - Create
+  instance-store AMIs by launching and provisioning a source instance, then
+  rebundling it and uploading it to S3.
+
+<div class="alert alert-block alert-info">
+<strong>Don't know which builder to use?</strong> If in doubt, use the
+<a href="/docs/builders/amazon-ebs.html">amazon-ebs builder</a>. It is
+much easier to use and Amazon generally recommends EBS-backed images nowadays.
+</div>

website/source/layouts/docs.erb

@@ -27,7 +27,7 @@
 
 		<ul>
 			<li><h4>Builders</h4></li>
-			<li><a href="/docs/builders/amazon-ebs.html">Amazon EC2 (AMI)</a></li>
+			<li><a href="/docs/builders/amazon.html">Amazon EC2 (AMI)</a></li>
 			<li><a href="/docs/builders/digitalocean.html">DigitalOcean</a></li>
 			<li><a href="/docs/builders/virtualbox.html">VirtualBox</a></li>
 			<li><a href="/docs/builders/vmware.html">VMware</a></li>