packer-cn/builder/amazon/ebs/step_cleanup_volumes.go

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package ebs
import (
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/mitchellh/multistep"
"github.com/mitchellh/packer/builder/amazon/common"
"github.com/mitchellh/packer/packer"
)
// stepCleanupVolumes cleans up any orphaned volumes that were not designated to
// remain after termination of the instance. These volumes are typically ones
// that are marked as "delete on terminate:false" in the source_ami of a build.
type stepCleanupVolumes struct {
BlockDevices common.BlockDevices
}
func (s *stepCleanupVolumes) Run(state multistep.StateBag) multistep.StepAction {
// stepCleanupVolumes is for Cleanup only
return multistep.ActionContinue
}
func (s *stepCleanupVolumes) Cleanup(state multistep.StateBag) {
ec2conn := state.Get("ec2").(*ec2.EC2)
instanceRaw := state.Get("instance")
var instance *ec2.Instance
if instanceRaw != nil {
instance = instanceRaw.(*ec2.Instance)
}
ui := state.Get("ui").(packer.Ui)
if instance == nil {
ui.Say("No volumes to clean up, skipping")
return
}
ui.Say("Cleaning up any extra volumes...")
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// We don't actually care about the value here, but we need Set behavior
save := make(map[string]struct{})
for _, b := range s.BlockDevices.AMIMappings {
if !b.DeleteOnTermination {
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save[b.DeviceName] = struct{}{}
}
}
for _, b := range s.BlockDevices.LaunchMappings {
if !b.DeleteOnTermination {
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save[b.DeviceName] = struct{}{}
}
}
// Collect Volume information from the cached Instance as a map of volume-id
// to device name, to compare with save list above
var vl []*string
volList := make(map[string]string)
for _, bdm := range instance.BlockDeviceMappings {
if bdm.Ebs != nil {
vl = append(vl, bdm.Ebs.VolumeId)
volList[*bdm.Ebs.VolumeId] = *bdm.DeviceName
}
}
// Using the volume list from the cached Instance, check with AWS for up to
// date information on them
resp, err := ec2conn.DescribeVolumes(&ec2.DescribeVolumesInput{
Filters: []*ec2.Filter{
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{
Name: aws.String("volume-id"),
Values: vl,
},
},
})
if err != nil {
ui.Say(fmt.Sprintf("Error describing volumes: %s", err))
return
}
// If any of the returned volumes are in a "deleting" stage or otherwise not
// available, remove them from the list of volumes
for _, v := range resp.Volumes {
if v.State != nil && *v.State != "available" {
delete(volList, *v.VolumeId)
}
}
if len(resp.Volumes) == 0 {
ui.Say("No volumes to clean up, skipping")
return
}
// Filter out any devices marked for saving
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for saveName := range save {
for volKey, volName := range volList {
if volName == saveName {
delete(volList, volKey)
}
}
}
// Destroy remaining volumes
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for k := range volList {
ui.Say(fmt.Sprintf("Destroying volume (%s)...", k))
_, err := ec2conn.DeleteVolume(&ec2.DeleteVolumeInput{VolumeId: aws.String(k)})
if err != nil {
ui.Say(fmt.Sprintf("Error deleting volume: %s", k))
ui.Say(fmt.Sprintf("The error is: %s", err))
}
}
}