terraform/builtin/providers/aws/resource_aws_instance.go

928 lines
24 KiB
Go

package aws
import (
"bytes"
"crypto/sha1"
"encoding/base64"
"encoding/hex"
"fmt"
"log"
"strings"
"time"
"github.com/awslabs/aws-sdk-go/aws"
"github.com/awslabs/aws-sdk-go/aws/awserr"
"github.com/awslabs/aws-sdk-go/service/ec2"
"github.com/hashicorp/terraform/helper/hashcode"
"github.com/hashicorp/terraform/helper/resource"
"github.com/hashicorp/terraform/helper/schema"
)
func resourceAwsInstance() *schema.Resource {
return &schema.Resource{
Create: resourceAwsInstanceCreate,
Read: resourceAwsInstanceRead,
Update: resourceAwsInstanceUpdate,
Delete: resourceAwsInstanceDelete,
SchemaVersion: 1,
MigrateState: resourceAwsInstanceMigrateState,
Schema: map[string]*schema.Schema{
"ami": &schema.Schema{
Type: schema.TypeString,
Required: true,
ForceNew: true,
},
"associate_public_ip_address": &schema.Schema{
Type: schema.TypeBool,
Optional: true,
ForceNew: true,
},
"availability_zone": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Computed: true,
ForceNew: true,
},
"placement_group": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Computed: true,
ForceNew: true,
},
"instance_type": &schema.Schema{
Type: schema.TypeString,
Required: true,
ForceNew: true,
},
"key_name": &schema.Schema{
Type: schema.TypeString,
Optional: true,
ForceNew: true,
Computed: true,
},
"subnet_id": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Computed: true,
ForceNew: true,
},
"private_ip": &schema.Schema{
Type: schema.TypeString,
Optional: true,
ForceNew: true,
Computed: true,
},
"source_dest_check": &schema.Schema{
Type: schema.TypeBool,
Optional: true,
},
"user_data": &schema.Schema{
Type: schema.TypeString,
Optional: true,
ForceNew: true,
StateFunc: func(v interface{}) string {
switch v.(type) {
case string:
hash := sha1.Sum([]byte(v.(string)))
return hex.EncodeToString(hash[:])
default:
return ""
}
},
},
"security_groups": &schema.Schema{
Type: schema.TypeSet,
Optional: true,
Computed: true,
ForceNew: true,
Elem: &schema.Schema{Type: schema.TypeString},
Set: schema.HashString,
},
"vpc_security_group_ids": &schema.Schema{
Type: schema.TypeSet,
Optional: true,
Computed: true,
Elem: &schema.Schema{Type: schema.TypeString},
Set: func(v interface{}) int {
return hashcode.String(v.(string))
},
},
"public_dns": &schema.Schema{
Type: schema.TypeString,
Computed: true,
},
"public_ip": &schema.Schema{
Type: schema.TypeString,
Computed: true,
},
"private_dns": &schema.Schema{
Type: schema.TypeString,
Computed: true,
},
"ebs_optimized": &schema.Schema{
Type: schema.TypeBool,
Optional: true,
},
"disable_api_termination": &schema.Schema{
Type: schema.TypeBool,
Optional: true,
},
"iam_instance_profile": &schema.Schema{
Type: schema.TypeString,
ForceNew: true,
Optional: true,
},
"tenancy": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Computed: true,
ForceNew: true,
},
"tags": tagsSchema(),
"block_device": &schema.Schema{
Type: schema.TypeMap,
Optional: true,
Removed: "Split out into three sub-types; see Changelog and Docs",
},
"ebs_block_device": &schema.Schema{
Type: schema.TypeSet,
Optional: true,
Computed: true,
Elem: &schema.Resource{
Schema: map[string]*schema.Schema{
"delete_on_termination": &schema.Schema{
Type: schema.TypeBool,
Optional: true,
Default: true,
ForceNew: true,
},
"device_name": &schema.Schema{
Type: schema.TypeString,
Required: true,
ForceNew: true,
},
"encrypted": &schema.Schema{
Type: schema.TypeBool,
Optional: true,
Computed: true,
ForceNew: true,
},
"iops": &schema.Schema{
Type: schema.TypeInt,
Optional: true,
Computed: true,
ForceNew: true,
},
"snapshot_id": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Computed: true,
ForceNew: true,
},
"volume_size": &schema.Schema{
Type: schema.TypeInt,
Optional: true,
Computed: true,
ForceNew: true,
},
"volume_type": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Computed: true,
ForceNew: true,
},
},
},
Set: func(v interface{}) int {
var buf bytes.Buffer
m := v.(map[string]interface{})
buf.WriteString(fmt.Sprintf("%s-", m["device_name"].(string)))
buf.WriteString(fmt.Sprintf("%s-", m["snapshot_id"].(string)))
return hashcode.String(buf.String())
},
},
"ephemeral_block_device": &schema.Schema{
Type: schema.TypeSet,
Optional: true,
Computed: true,
ForceNew: true,
Elem: &schema.Resource{
Schema: map[string]*schema.Schema{
"device_name": &schema.Schema{
Type: schema.TypeString,
Required: true,
},
"virtual_name": &schema.Schema{
Type: schema.TypeString,
Required: true,
},
},
},
Set: func(v interface{}) int {
var buf bytes.Buffer
m := v.(map[string]interface{})
buf.WriteString(fmt.Sprintf("%s-", m["device_name"].(string)))
buf.WriteString(fmt.Sprintf("%s-", m["virtual_name"].(string)))
return hashcode.String(buf.String())
},
},
"root_block_device": &schema.Schema{
// TODO: This is a set because we don't support singleton
// sub-resources today. We'll enforce that the set only ever has
// length zero or one below. When TF gains support for
// sub-resources this can be converted.
Type: schema.TypeSet,
Optional: true,
Computed: true,
Elem: &schema.Resource{
// "You can only modify the volume size, volume type, and Delete on
// Termination flag on the block device mapping entry for the root
// device volume." - bit.ly/ec2bdmap
Schema: map[string]*schema.Schema{
"delete_on_termination": &schema.Schema{
Type: schema.TypeBool,
Optional: true,
Default: true,
ForceNew: true,
},
"iops": &schema.Schema{
Type: schema.TypeInt,
Optional: true,
Computed: true,
ForceNew: true,
},
"volume_size": &schema.Schema{
Type: schema.TypeInt,
Optional: true,
Computed: true,
ForceNew: true,
},
"volume_type": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Computed: true,
ForceNew: true,
},
},
},
Set: func(v interface{}) int {
// there can be only one root device; no need to hash anything
return 0
},
},
},
}
}
func resourceAwsInstanceCreate(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
// Figure out user data
userData := ""
if v := d.Get("user_data"); v != nil {
userData = base64.StdEncoding.EncodeToString([]byte(v.(string)))
}
// check for non-default Subnet, and cast it to a String
var hasSubnet bool
subnet, hasSubnet := d.GetOk("subnet_id")
subnetID := subnet.(string)
placement := &ec2.Placement{
AvailabilityZone: aws.String(d.Get("availability_zone").(string)),
GroupName: aws.String(d.Get("placement_group").(string)),
}
if hasSubnet {
// Tenancy is only valid inside a VPC
// See http://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_Placement.html
if v := d.Get("tenancy").(string); v != "" {
placement.Tenancy = aws.String(v)
}
}
iam := &ec2.IAMInstanceProfileSpecification{
Name: aws.String(d.Get("iam_instance_profile").(string)),
}
// Build the creation struct
runOpts := &ec2.RunInstancesInput{
ImageID: aws.String(d.Get("ami").(string)),
Placement: placement,
InstanceType: aws.String(d.Get("instance_type").(string)),
MaxCount: aws.Long(int64(1)),
MinCount: aws.Long(int64(1)),
UserData: aws.String(userData),
EBSOptimized: aws.Boolean(d.Get("ebs_optimized").(bool)),
DisableAPITermination: aws.Boolean(d.Get("disable_api_termination").(bool)),
IAMInstanceProfile: iam,
}
associatePublicIPAddress := false
if v := d.Get("associate_public_ip_address"); v != nil {
associatePublicIPAddress = v.(bool)
}
var groups []*string
if v := d.Get("security_groups"); v != nil {
// Security group names.
// For a nondefault VPC, you must use security group IDs instead.
// See http://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_RunInstances.html
sgs := v.(*schema.Set).List()
if len(sgs) > 0 && hasSubnet {
log.Printf("[WARN] Deprecated. Attempting to use 'security_groups' within a VPC instance. Use 'vpc_security_group_ids' instead.")
}
for _, v := range sgs {
str := v.(string)
groups = append(groups, aws.String(str))
}
}
if hasSubnet && associatePublicIPAddress {
// If we have a non-default VPC / Subnet specified, we can flag
// AssociatePublicIpAddress to get a Public IP assigned. By default these are not provided.
// You cannot specify both SubnetId and the NetworkInterface.0.* parameters though, otherwise
// you get: Network interfaces and an instance-level subnet ID may not be specified on the same request
// You also need to attach Security Groups to the NetworkInterface instead of the instance,
// to avoid: Network interfaces and an instance-level security groups may not be specified on
// the same request
ni := &ec2.InstanceNetworkInterfaceSpecification{
AssociatePublicIPAddress: aws.Boolean(associatePublicIPAddress),
DeviceIndex: aws.Long(int64(0)),
SubnetID: aws.String(subnetID),
Groups: groups,
}
if v, ok := d.GetOk("private_ip"); ok {
ni.PrivateIPAddress = aws.String(v.(string))
}
if v := d.Get("vpc_security_group_ids"); v != nil {
for _, v := range v.(*schema.Set).List() {
ni.Groups = append(ni.Groups, aws.String(v.(string)))
}
}
runOpts.NetworkInterfaces = []*ec2.InstanceNetworkInterfaceSpecification{ni}
} else {
if subnetID != "" {
runOpts.SubnetID = aws.String(subnetID)
}
if v, ok := d.GetOk("private_ip"); ok {
runOpts.PrivateIPAddress = aws.String(v.(string))
}
if runOpts.SubnetID != nil &&
*runOpts.SubnetID != "" {
runOpts.SecurityGroupIDs = groups
} else {
runOpts.SecurityGroups = groups
}
if v := d.Get("vpc_security_group_ids"); v != nil {
for _, v := range v.(*schema.Set).List() {
runOpts.SecurityGroupIDs = append(runOpts.SecurityGroupIDs, aws.String(v.(string)))
}
}
}
if v, ok := d.GetOk("key_name"); ok {
runOpts.KeyName = aws.String(v.(string))
}
blockDevices := make([]*ec2.BlockDeviceMapping, 0)
if v, ok := d.GetOk("ebs_block_device"); ok {
vL := v.(*schema.Set).List()
for _, v := range vL {
bd := v.(map[string]interface{})
ebs := &ec2.EBSBlockDevice{
DeleteOnTermination: aws.Boolean(bd["delete_on_termination"].(bool)),
}
if v, ok := bd["snapshot_id"].(string); ok && v != "" {
ebs.SnapshotID = aws.String(v)
}
if v, ok := bd["encrypted"].(bool); ok && v {
ebs.Encrypted = aws.Boolean(v)
}
if v, ok := bd["volume_size"].(int); ok && v != 0 {
ebs.VolumeSize = aws.Long(int64(v))
}
if v, ok := bd["volume_type"].(string); ok && v != "" {
ebs.VolumeType = aws.String(v)
}
if v, ok := bd["iops"].(int); ok && v > 0 {
ebs.IOPS = aws.Long(int64(v))
}
blockDevices = append(blockDevices, &ec2.BlockDeviceMapping{
DeviceName: aws.String(bd["device_name"].(string)),
EBS: ebs,
})
}
}
if v, ok := d.GetOk("ephemeral_block_device"); ok {
vL := v.(*schema.Set).List()
for _, v := range vL {
bd := v.(map[string]interface{})
blockDevices = append(blockDevices, &ec2.BlockDeviceMapping{
DeviceName: aws.String(bd["device_name"].(string)),
VirtualName: aws.String(bd["virtual_name"].(string)),
})
}
}
if v, ok := d.GetOk("root_block_device"); ok {
vL := v.(*schema.Set).List()
if len(vL) > 1 {
return fmt.Errorf("Cannot specify more than one root_block_device.")
}
for _, v := range vL {
bd := v.(map[string]interface{})
ebs := &ec2.EBSBlockDevice{
DeleteOnTermination: aws.Boolean(bd["delete_on_termination"].(bool)),
}
if v, ok := bd["volume_size"].(int); ok && v != 0 {
ebs.VolumeSize = aws.Long(int64(v))
}
if v, ok := bd["volume_type"].(string); ok && v != "" {
ebs.VolumeType = aws.String(v)
}
if v, ok := bd["iops"].(int); ok && v > 0 {
ebs.IOPS = aws.Long(int64(v))
}
if dn, err := fetchRootDeviceName(d.Get("ami").(string), conn); err == nil {
if dn == nil {
return fmt.Errorf(
"Expected 1 AMI for ID: %s, got none",
d.Get("ami").(string))
}
blockDevices = append(blockDevices, &ec2.BlockDeviceMapping{
DeviceName: dn,
EBS: ebs,
})
} else {
return err
}
}
}
if len(blockDevices) > 0 {
runOpts.BlockDeviceMappings = blockDevices
}
// Create the instance
log.Printf("[DEBUG] Run configuration: %#v", runOpts)
var err error
var runResp *ec2.Reservation
for i := 0; i < 5; i++ {
runResp, err = conn.RunInstances(runOpts)
if awsErr, ok := err.(awserr.Error); ok {
// IAM profiles can take ~10 seconds to propagate in AWS:
// http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html#launch-instance-with-role-console
if awsErr.Code() == "InvalidParameterValue" && strings.Contains(awsErr.Message(), "Invalid IAM Instance Profile") {
log.Printf("[DEBUG] Invalid IAM Instance Profile referenced, retrying...")
time.Sleep(2 * time.Second)
continue
}
}
break
}
if err != nil {
return fmt.Errorf("Error launching source instance: %s", err)
}
instance := runResp.Instances[0]
log.Printf("[INFO] Instance ID: %s", *instance.InstanceID)
// Store the resulting ID so we can look this up later
d.SetId(*instance.InstanceID)
// Wait for the instance to become running so we can get some attributes
// that aren't available until later.
log.Printf(
"[DEBUG] Waiting for instance (%s) to become running",
*instance.InstanceID)
stateConf := &resource.StateChangeConf{
Pending: []string{"pending"},
Target: "running",
Refresh: InstanceStateRefreshFunc(conn, *instance.InstanceID),
Timeout: 10 * time.Minute,
Delay: 10 * time.Second,
MinTimeout: 3 * time.Second,
}
instanceRaw, err := stateConf.WaitForState()
if err != nil {
return fmt.Errorf(
"Error waiting for instance (%s) to become ready: %s",
*instance.InstanceID, err)
}
instance = instanceRaw.(*ec2.Instance)
// Initialize the connection info
if instance.PublicIPAddress != nil {
d.SetConnInfo(map[string]string{
"type": "ssh",
"host": *instance.PublicIPAddress,
})
} else if instance.PrivateIPAddress != nil {
d.SetConnInfo(map[string]string{
"type": "ssh",
"host": *instance.PrivateIPAddress,
})
}
// Set our attributes
if err := resourceAwsInstanceRead(d, meta); err != nil {
return err
}
// Update if we need to
return resourceAwsInstanceUpdate(d, meta)
}
func resourceAwsInstanceRead(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
resp, err := conn.DescribeInstances(&ec2.DescribeInstancesInput{
InstanceIDs: []*string{aws.String(d.Id())},
})
if err != nil {
// If the instance was not found, return nil so that we can show
// that the instance is gone.
if ec2err, ok := err.(awserr.Error); ok && ec2err.Code() == "InvalidInstanceID.NotFound" {
d.SetId("")
return nil
}
// Some other error, report it
return err
}
// If nothing was found, then return no state
if len(resp.Reservations) == 0 {
d.SetId("")
return nil
}
instance := resp.Reservations[0].Instances[0]
// If the instance is terminated, then it is gone
if *instance.State.Name == "terminated" {
d.SetId("")
return nil
}
if instance.Placement != nil {
d.Set("availability_zone", instance.Placement.AvailabilityZone)
}
if instance.Placement.Tenancy != nil {
d.Set("tenancy", instance.Placement.Tenancy)
}
d.Set("key_name", instance.KeyName)
d.Set("public_dns", instance.PublicDNSName)
d.Set("public_ip", instance.PublicIPAddress)
d.Set("private_dns", instance.PrivateDNSName)
d.Set("private_ip", instance.PrivateIPAddress)
if len(instance.NetworkInterfaces) > 0 {
d.Set("subnet_id", instance.NetworkInterfaces[0].SubnetID)
} else {
d.Set("subnet_id", instance.SubnetID)
}
d.Set("ebs_optimized", instance.EBSOptimized)
d.Set("tags", tagsToMap(instance.Tags))
// Determine whether we're referring to security groups with
// IDs or names. We use a heuristic to figure this out. By default,
// we use IDs if we're in a VPC. However, if we previously had an
// all-name list of security groups, we use names. Or, if we had any
// IDs, we use IDs.
useID := instance.SubnetID != nil && *instance.SubnetID != ""
if v := d.Get("security_groups"); v != nil {
match := useID
sgs := v.(*schema.Set).List()
if len(sgs) > 0 {
match = false
for _, v := range v.(*schema.Set).List() {
if strings.HasPrefix(v.(string), "sg-") {
match = true
break
}
}
}
useID = match
}
// Build up the security groups
sgs := make([]string, 0, len(instance.SecurityGroups))
if useID {
for _, sg := range instance.SecurityGroups {
sgs = append(sgs, *sg.GroupID)
}
log.Printf("[DEBUG] Setting Security Group IDs: %#v", sgs)
if err := d.Set("vpc_security_group_ids", sgs); err != nil {
return err
}
} else {
for _, sg := range instance.SecurityGroups {
sgs = append(sgs, *sg.GroupName)
}
log.Printf("[DEBUG] Setting Security Group Names: %#v", sgs)
if err := d.Set("security_groups", sgs); err != nil {
return err
}
}
if err := readBlockDevices(d, instance, conn); err != nil {
return err
}
return nil
}
func resourceAwsInstanceUpdate(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
d.Partial(true)
if err := setTags(conn, d); err != nil {
return err
} else {
d.SetPartial("tags")
}
// SourceDestCheck can only be set on VPC instances
if d.Get("subnet_id").(string) != "" {
log.Printf("[INFO] Modifying instance %s", d.Id())
_, err := conn.ModifyInstanceAttribute(&ec2.ModifyInstanceAttributeInput{
InstanceID: aws.String(d.Id()),
SourceDestCheck: &ec2.AttributeBooleanValue{
Value: aws.Boolean(d.Get("source_dest_check").(bool)),
},
})
if err != nil {
return err
}
}
if d.HasChange("vpc_security_group_ids") {
var groups []*string
if v := d.Get("vpc_security_group_ids"); v != nil {
for _, v := range v.(*schema.Set).List() {
groups = append(groups, aws.String(v.(string)))
}
}
_, err := conn.ModifyInstanceAttribute(&ec2.ModifyInstanceAttributeInput{
InstanceID: aws.String(d.Id()),
Groups: groups,
})
if err != nil {
return err
}
}
if d.HasChange("disable_api_termination") {
_, err := conn.ModifyInstanceAttribute(&ec2.ModifyInstanceAttributeInput{
InstanceID: aws.String(d.Id()),
DisableAPITermination: &ec2.AttributeBooleanValue{
Value: aws.Boolean(d.Get("disable_api_termination").(bool)),
},
})
if err != nil {
return err
}
}
// TODO(mitchellh): wait for the attributes we modified to
// persist the change...
d.Partial(false)
return resourceAwsInstanceRead(d, meta)
}
func resourceAwsInstanceDelete(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
log.Printf("[INFO] Terminating instance: %s", d.Id())
req := &ec2.TerminateInstancesInput{
InstanceIDs: []*string{aws.String(d.Id())},
}
if _, err := conn.TerminateInstances(req); err != nil {
return fmt.Errorf("Error terminating instance: %s", err)
}
log.Printf(
"[DEBUG] Waiting for instance (%s) to become terminated",
d.Id())
stateConf := &resource.StateChangeConf{
Pending: []string{"pending", "running", "shutting-down", "stopped", "stopping"},
Target: "terminated",
Refresh: InstanceStateRefreshFunc(conn, d.Id()),
Timeout: 10 * time.Minute,
Delay: 10 * time.Second,
MinTimeout: 3 * time.Second,
}
_, err := stateConf.WaitForState()
if err != nil {
return fmt.Errorf(
"Error waiting for instance (%s) to terminate: %s",
d.Id(), err)
}
d.SetId("")
return nil
}
// InstanceStateRefreshFunc returns a resource.StateRefreshFunc that is used to watch
// an EC2 instance.
func InstanceStateRefreshFunc(conn *ec2.EC2, instanceID string) resource.StateRefreshFunc {
return func() (interface{}, string, error) {
resp, err := conn.DescribeInstances(&ec2.DescribeInstancesInput{
InstanceIDs: []*string{aws.String(instanceID)},
})
if err != nil {
if ec2err, ok := err.(awserr.Error); ok && ec2err.Code() == "InvalidInstanceID.NotFound" {
// Set this to nil as if we didn't find anything.
resp = nil
} else {
log.Printf("Error on InstanceStateRefresh: %s", err)
return nil, "", err
}
}
if resp == nil || len(resp.Reservations) == 0 || len(resp.Reservations[0].Instances) == 0 {
// Sometimes AWS just has consistency issues and doesn't see
// our instance yet. Return an empty state.
return nil, "", nil
}
i := resp.Reservations[0].Instances[0]
return i, *i.State.Name, nil
}
}
func readBlockDevices(d *schema.ResourceData, instance *ec2.Instance, conn *ec2.EC2) error {
ibds, err := readBlockDevicesFromInstance(instance, conn)
if err != nil {
return err
}
if err := d.Set("ebs_block_device", ibds["ebs"]); err != nil {
return err
}
if ibds["root"] != nil {
if err := d.Set("root_block_device", []interface{}{ibds["root"]}); err != nil {
return err
}
}
return nil
}
func readBlockDevicesFromInstance(instance *ec2.Instance, conn *ec2.EC2) (map[string]interface{}, error) {
blockDevices := make(map[string]interface{})
blockDevices["ebs"] = make([]map[string]interface{}, 0)
blockDevices["root"] = nil
instanceBlockDevices := make(map[string]*ec2.InstanceBlockDeviceMapping)
for _, bd := range instance.BlockDeviceMappings {
if bd.EBS != nil {
instanceBlockDevices[*(bd.EBS.VolumeID)] = bd
}
}
if len(instanceBlockDevices) == 0 {
return nil, nil
}
volIDs := make([]*string, 0, len(instanceBlockDevices))
for volID := range instanceBlockDevices {
volIDs = append(volIDs, aws.String(volID))
}
// Need to call DescribeVolumes to get volume_size and volume_type for each
// EBS block device
volResp, err := conn.DescribeVolumes(&ec2.DescribeVolumesInput{
VolumeIDs: volIDs,
})
if err != nil {
return nil, err
}
for _, vol := range volResp.Volumes {
instanceBd := instanceBlockDevices[*vol.VolumeID]
bd := make(map[string]interface{})
if instanceBd.EBS != nil && instanceBd.EBS.DeleteOnTermination != nil {
bd["delete_on_termination"] = *instanceBd.EBS.DeleteOnTermination
}
if vol.Size != nil {
bd["volume_size"] = *vol.Size
}
if vol.VolumeType != nil {
bd["volume_type"] = *vol.VolumeType
}
if vol.IOPS != nil {
bd["iops"] = *vol.IOPS
}
if blockDeviceIsRoot(instanceBd, instance) {
blockDevices["root"] = bd
} else {
if instanceBd.DeviceName != nil {
bd["device_name"] = *instanceBd.DeviceName
}
if vol.Encrypted != nil {
bd["encrypted"] = *vol.Encrypted
}
if vol.SnapshotID != nil {
bd["snapshot_id"] = *vol.SnapshotID
}
blockDevices["ebs"] = append(blockDevices["ebs"].([]map[string]interface{}), bd)
}
}
return blockDevices, nil
}
func blockDeviceIsRoot(bd *ec2.InstanceBlockDeviceMapping, instance *ec2.Instance) bool {
return (bd.DeviceName != nil &&
instance.RootDeviceName != nil &&
*bd.DeviceName == *instance.RootDeviceName)
}
func fetchRootDeviceName(ami string, conn *ec2.EC2) (*string, error) {
if ami == "" {
return nil, fmt.Errorf("Cannot fetch root device name for blank AMI ID.")
}
log.Printf("[DEBUG] Describing AMI %q to get root block device name", ami)
req := &ec2.DescribeImagesInput{ImageIDs: []*string{aws.String(ami)}}
if res, err := conn.DescribeImages(req); err == nil {
if len(res.Images) == 1 {
return res.Images[0].RootDeviceName, nil
} else if len(res.Images) == 0 {
return nil, nil
} else {
return nil, fmt.Errorf("Expected 1 AMI for ID: %s, got: %#v", ami, res.Images)
}
} else {
return nil, err
}
}