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step_encrypted_ami.go
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step_encrypted_ami.go
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package common
import (
"fmt"
"log"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/mitchellh/multistep"
"github.com/mitchellh/packer/packer"
)
type StepCreateEncryptedAMICopy struct {
image *ec2.Image
KeyID string
EncryptBootVolume bool
Name string
}
func (s *StepCreateEncryptedAMICopy) Run(state multistep.StateBag) multistep.StepAction {
ec2conn := state.Get("ec2").(*ec2.EC2)
ui := state.Get("ui").(packer.Ui)
kmsKeyId := s.KeyID
// Encrypt boot not set, so skip step
if !s.EncryptBootVolume {
if kmsKeyId != "" {
log.Printf("Ignoring KMS Key ID: %s, encrypted=false", kmsKeyId)
}
return multistep.ActionContinue
}
ui.Say("Creating Encrypted AMI Copy")
amis := state.Get("amis").(map[string]string)
var region, id string
if amis != nil {
for region, id = range amis {
break // Only get the first
}
}
ui.Say(fmt.Sprintf("Copying AMI: %s(%s)", region, id))
if kmsKeyId != "" {
ui.Say(fmt.Sprintf("Encypting with KMS Key ID: %s", kmsKeyId))
}
copyOpts := &ec2.CopyImageInput{
Name: &s.Name, // Try to overwrite existing AMI
SourceImageId: aws.String(id),
SourceRegion: aws.String(region),
Encrypted: aws.Bool(true),
KmsKeyId: aws.String(kmsKeyId),
}
copyResp, err := ec2conn.CopyImage(copyOpts)
if err != nil {
err := fmt.Errorf("Error copying AMI: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
// Wait for the copy to become ready
stateChange := StateChangeConf{
Pending: []string{"pending"},
Target: "available",
Refresh: AMIStateRefreshFunc(ec2conn, *copyResp.ImageId),
StepState: state,
}
ui.Say("Waiting for AMI copy to become ready...")
if _, err := WaitForState(&stateChange); err != nil {
err := fmt.Errorf("Error waiting for AMI Copy: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
// Get the encrypted AMI image, we need the new snapshot id's
encImagesResp, err := ec2conn.DescribeImages(&ec2.DescribeImagesInput{ImageIds: []*string{aws.String(*copyResp.ImageId)}})
if err != nil {
err := fmt.Errorf("Error searching for AMI: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
encImage := encImagesResp.Images[0]
var encSnapshots []string
for _, blockDevice := range encImage.BlockDeviceMappings {
if blockDevice.Ebs != nil && blockDevice.Ebs.SnapshotId != nil {
encSnapshots = append(encSnapshots, *blockDevice.Ebs.SnapshotId)
}
}
// Get the unencrypted AMI image
unencImagesResp, err := ec2conn.DescribeImages(&ec2.DescribeImagesInput{ImageIds: []*string{aws.String(id)}})
if err != nil {
err := fmt.Errorf("Error searching for AMI: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
unencImage := unencImagesResp.Images[0]
// Remove unencrypted AMI
ui.Say("Deregistering unencrypted AMI")
deregisterOpts := &ec2.DeregisterImageInput{ImageId: aws.String(id)}
if _, err := ec2conn.DeregisterImage(deregisterOpts); err != nil {
ui.Error(fmt.Sprintf("Error deregistering AMI, may still be around: %s", err))
return multistep.ActionHalt
}
// Remove associated unencrypted snapshot(s)
ui.Say("Deleting unencrypted snapshots")
snapshots := state.Get("snapshots").(map[string][]string)
for _, blockDevice := range unencImage.BlockDeviceMappings {
if blockDevice.Ebs != nil && blockDevice.Ebs.SnapshotId != nil {
ui.Message(fmt.Sprintf("Snapshot ID: %s", *blockDevice.Ebs.SnapshotId))
deleteSnapOpts := &ec2.DeleteSnapshotInput{
SnapshotId: aws.String(*blockDevice.Ebs.SnapshotId),
}
if _, err := ec2conn.DeleteSnapshot(deleteSnapOpts); err != nil {
ui.Error(fmt.Sprintf("Error deleting snapshot, may still be around: %s", err))
return multistep.ActionHalt
}
}
}
// Replace original AMI ID with Encrypted ID in state
amis[region] = *copyResp.ImageId
snapshots[region] = encSnapshots
state.Put("amis", amis)
state.Put("snapshots", snapshots)
imagesResp, err := ec2conn.DescribeImages(&ec2.DescribeImagesInput{ImageIds: []*string{copyResp.ImageId}})
if err != nil {
err := fmt.Errorf("Error searching for AMI: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
s.image = imagesResp.Images[0]
return multistep.ActionContinue
}
func (s *StepCreateEncryptedAMICopy) Cleanup(state multistep.StateBag) {
if s.image == nil {
return
}
_, cancelled := state.GetOk(multistep.StateCancelled)
_, halted := state.GetOk(multistep.StateHalted)
if !cancelled && !halted {
return
}
ec2conn := state.Get("ec2").(*ec2.EC2)
ui := state.Get("ui").(packer.Ui)
ui.Say("Deregistering the AMI because cancelation or error...")
deregisterOpts := &ec2.DeregisterImageInput{ImageId: s.image.ImageId}
if _, err := ec2conn.DeregisterImage(deregisterOpts); err != nil {
ui.Error(fmt.Sprintf("Error deregistering AMI, may still be around: %s", err))
return
}
}