step_create_tags.go

package common

import (
	"fmt"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/awserr"
	"github.com/aws/aws-sdk-go/aws/session"
	"github.com/aws/aws-sdk-go/service/ec2"
	"github.com/mitchellh/multistep"
	retry "github.com/mitchellh/packer/common"
	"github.com/mitchellh/packer/packer"
)

type StepCreateTags struct {
	Tags map[string]string
}

func (s *StepCreateTags) Run(state multistep.StateBag) multistep.StepAction {
	ec2conn := state.Get("ec2").(*ec2.EC2)
	ui := state.Get("ui").(packer.Ui)
	amis := state.Get("amis").(map[string]string)

	if len(s.Tags) > 0 {
		for region, ami := range amis {
			ui.Say(fmt.Sprintf("Adding tags to AMI (%s)...", ami))

			var ec2Tags []*ec2.Tag
			for key, value := range s.Tags {
				ui.Message(fmt.Sprintf("Adding tag: \"%s\": \"%s\"", key, value))
				ec2Tags = append(ec2Tags, &ec2.Tag{
					Key:   aws.String(key),
					Value: aws.String(value),
				})
			}

			// Declare list of resources to tag
			resourceIds := []*string{&ami}
			awsConfig := aws.Config{
				Credentials: ec2conn.Config.Credentials,
				Region:      aws.String(region),
			}
			session, err := session.NewSession(&awsConfig)
			if err != nil {
				err := fmt.Errorf("Error creating AWS session: %s", err)
				state.Put("error", err)
				ui.Error(err.Error())
				return multistep.ActionHalt
			}

			regionconn := ec2.New(session)

			// Retrieve image list for given AMI
			imageResp, err := regionconn.DescribeImages(&ec2.DescribeImagesInput{
				ImageIds: resourceIds,
			})

			if err != nil {
				err := fmt.Errorf("Error retrieving details for AMI (%s): %s", ami, err)
				state.Put("error", err)
				ui.Error(err.Error())
				return multistep.ActionHalt
			}

			if len(imageResp.Images) == 0 {
				err := fmt.Errorf("Error retrieving details for AMI (%s), no images found", ami)
				state.Put("error", err)
				ui.Error(err.Error())
				return multistep.ActionHalt
			}

			image := imageResp.Images[0]

			// Add only those with a Snapshot ID, i.e. not Ephemeral
			for _, device := range image.BlockDeviceMappings {
				if device.Ebs != nil && device.Ebs.SnapshotId != nil {
					ui.Say(fmt.Sprintf("Tagging snapshot: %s", *device.Ebs.SnapshotId))
					resourceIds = append(resourceIds, device.Ebs.SnapshotId)
				}
			}

			// Retry creating tags for about 2.5 minutes
			err = retry.Retry(0.2, 30, 11, func() (bool, error) {
				_, err := regionconn.CreateTags(&ec2.CreateTagsInput{
					Resources: resourceIds,
					Tags:      ec2Tags,
				})
				if err == nil {
					return true, nil
				}
				if awsErr, ok := err.(awserr.Error); ok {
					if awsErr.Code() == "InvalidAMIID.NotFound" ||
						awsErr.Code() == "InvalidSnapshot.NotFound" {
						return false, nil
					}
				}
				return true, err
			})

			if err != nil {
				err := fmt.Errorf("Error adding tags to Resources (%#v): %s", resourceIds, err)
				state.Put("error", err)
				ui.Error(err.Error())
				return multistep.ActionHalt
			}
		}
	}

	return multistep.ActionContinue
}

func (s *StepCreateTags) Cleanup(state multistep.StateBag) {
	// No cleanup...
}