Closes #3908: Adds snapshot tag overrides

This commit adds the ability to configure unique tags on snapshots
that are separate from the tags defined on the AMI. Anything applied
to the AMI will also be applied to the snapshots, but `snapshot_tags`
will override and append tags to the tags already applied to the snapshots

builder/amazon/chroot/builder.go

@@ -262,7 +262,8 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 			ProductCodes: b.config.AMIProductCodes,
 		},
 		&awscommon.StepCreateTags{
-			Tags: b.config.AMITags,
+			Tags:         b.config.AMITags,
+			SnapshotTags: b.config.SnapshotTags,
 		},
 	)
 

builder/amazon/common/ami_config.go

@@ -20,6 +20,7 @@ type AMIConfig struct {
 	AMIEnhancedNetworking   bool              `mapstructure:"enhanced_networking"`
 	AMIForceDeregister      bool              `mapstructure:"force_deregister"`
 	AMIEncryptBootVolume    bool              `mapstructure:"encrypt_boot"`
+	SnapshotTags            map[string]string `mapstructure:"snapshot_tags"`
 }
 
 func (c *AMIConfig) Prepare(ctx *interpolate.Context) []error {

builder/amazon/common/step_create_tags.go

@@ -13,7 +13,8 @@ import (
 )
 
 type StepCreateTags struct {
-	Tags map[string]string
+	Tags         map[string]string
+	SnapshotTags map[string]string
 }
 
 func (s *StepCreateTags) Run(state multistep.StateBag) multistep.StepAction {
@@ -21,21 +22,15 @@ func (s *StepCreateTags) Run(state multistep.StateBag) multistep.StepAction {
 	ui := state.Get("ui").(packer.Ui)
 	amis := state.Get("amis").(map[string]string)
 
-	if len(s.Tags) > 0 {
+	if len(s.Tags) > 0 || len(s.SnapshotTags) > 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),
-				})
-			}
+			// Convert tags to ec2.Tag format
+			ec2Tags := ConvertToEC2Tags(s.Tags, ui)
+			snapshotTags := ConvertToEC2Tags(s.SnapshotTags, ui)
 
 			// Declare list of resources to tag
-			resourceIds := []*string{&ami}
 			awsConfig := aws.Config{
 				Credentials: ec2conn.Config.Credentials,
 				Region:      aws.String(region),
@@ -47,10 +42,10 @@ func (s *StepCreateTags) Run(state multistep.StateBag) multistep.StepAction {
 				ui.Error(err.Error())
 				return multistep.ActionHalt
 			}
-
 			regionconn := ec2.New(session)
 
 			// Retrieve image list for given AMI
+			resourceIds := []*string{&ami}
 			imageResp, err := regionconn.DescribeImages(&ec2.DescribeImagesInput{
 				ImageIds: resourceIds,
 			})
@@ -70,17 +65,20 @@ func (s *StepCreateTags) Run(state multistep.StateBag) multistep.StepAction {
 			}
 
 			image := imageResp.Images[0]
+			snapshotIds := []*string{}
 
 			// 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)
+					snapshotIds = append(snapshotIds, device.Ebs.SnapshotId)
 				}
 			}
 
 			// Retry creating tags for about 2.5 minutes
 			err = retry.Retry(0.2, 30, 11, func() (bool, error) {
+				// Tag images and snapshots
 				_, err := regionconn.CreateTags(&ec2.CreateTagsInput{
 					Resources: resourceIds,
 					Tags:      ec2Tags,
@@ -94,6 +92,20 @@ func (s *StepCreateTags) Run(state multistep.StateBag) multistep.StepAction {
 						return false, nil
 					}
 				}
+
+				// Override tags on snapshots
+				_, err = regionconn.CreateTags(&ec2.CreateTagsInput{
+					Resources: snapshotIds,
+					Tags:      snapshotTags,
+				})
+				if err == nil {
+					return true, nil
+				}
+				if awsErr, ok := err.(awserr.Error); ok {
+					if awsErr.Code() == "InvalidSnapshot.NotFound" {
+						return false, nil
+					}
+				}
 				return true, err
 			})
 
@@ -112,3 +124,15 @@ func (s *StepCreateTags) Run(state multistep.StateBag) multistep.StepAction {
 func (s *StepCreateTags) Cleanup(state multistep.StateBag) {
 	// No cleanup...
 }
+
+func ConvertToEC2Tags(tags map[string]string, ui packer.Ui) []*ec2.Tag {
+	var ec2Tags []*ec2.Tag
+	for key, value := range tags {
+		ui.Message(fmt.Sprintf("Adding tag: \"%s\": \"%s\"", key, value))
+		ec2Tags = append(ec2Tags, &ec2.Tag{
+			Key:   aws.String(key),
+			Value: aws.String(value),
+		})
+	}
+	return ec2Tags
+}

builder/amazon/ebs/builder.go

@@ -182,7 +182,8 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 			ProductCodes: b.config.AMIProductCodes,
 		},
 		&awscommon.StepCreateTags{
-			Tags: b.config.AMITags,
+			Tags:         b.config.AMITags,
+			SnapshotTags: b.config.SnapshotTags,
 		},
 	}
 

builder/amazon/instance/builder.go

@@ -263,7 +263,8 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 			ProductCodes: b.config.AMIProductCodes,
 		},
 		&awscommon.StepCreateTags{
-			Tags: b.config.AMITags,
+			Tags:         b.config.AMITags,
+			SnapshotTags: b.config.SnapshotTags,
 		},
 	}
 

website/source/docs/builders/amazon-chroot.html.md

@@ -200,6 +200,9 @@ each category, the available configuration keys are alphabetized.
     -   `most_recent` (bool) - Selects the newest created image when true.
          This is most useful for selecting a daily distro build.
 
+-   `snapshot_tags` (object of key/value strings) - Tags to apply to snapshot.
+     They will override AMI tags if already applied to snapshot.
+
 -   `tags` (object of key/value strings) - Tags applied to the AMI.
 
 ## Basic Example

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

@@ -203,6 +203,9 @@ builder.
     -   `most_recent` (bool) - Selects the newest created image when true.
          This is most useful for selecting a daily distro build.
 
+-   `snapshot_tags` (object of key/value strings) - Tags to apply to snapshot.
+     They will override AMI tags if already applied to snapshot.
+
 -   `spot_price` (string) - The maximum hourly price to pay for a spot instance
     to create the AMI. Spot instances are a type of instance that EC2 starts
     when the current spot price is less than the maximum price you specify. Spot

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

@@ -219,6 +219,9 @@ builder.
     -   `most_recent` (bool) - Selects the newest created image when true.
          This is most useful for selecting a daily distro build.
 
+-   `snapshot_tags` (object of key/value strings) - Tags to apply to snapshot.
+     They will override AMI tags if already applied to snapshot.
+
 -   `spot_price` (string) - The maximum hourly price to launch a spot instance
     to create the AMI. It is a type of instances that EC2 starts when the
     maximum price that you specify exceeds the current spot price. Spot price