func destroyVolume(client *ec2.EC2, volumeId string) (err error) {
defer func() {
if err != nil {
if ec2ErrCode(err) == volumeNotFound || errors.IsNotFound(err) {
// Either the volume isn't found, or we queried the
// instance corresponding to a DeleteOnTermination
// attachment; in either case, the volume is or will
// be destroyed.
logger.Tracef("Ignoring error destroying volume %q: %v", volumeId, err)
err = nil
}
}
}()
logger.Debugf("destroying %q", volumeId)
// Volumes must not be in-use when destroying. A volume may
// still be in-use when the instance it is attached to is
// in the process of being terminated.
volume, err := waitVolume(client, volumeId, destroyVolumeAttempt, func(volume *ec2.Volume) (bool, error) {
if volume.Status != volumeStatusInUse {
// Volume is not in use, it should be OK to destroy now.
return true, nil
}
if len(volume.Attachments) == 0 {
// There are no attachments remaining now; keep querying
// until volume transitions out of in-use.
return false, nil
}
var deleteOnTermination []string
var args []storage.VolumeAttachmentParams
for _, a := range volume.Attachments {
switch a.Status {
case attachmentStatusAttaching, attachmentStatusAttached:
// The volume is attaching or attached to an
// instance, we need for it to be detached
// before we can destroy it.
args = append(args, storage.VolumeAttachmentParams{
AttachmentParams: storage.AttachmentParams{
InstanceId: instance.Id(a.InstanceId),
},
VolumeId: volumeId,
})
if a.DeleteOnTermination {
// The volume is still attached, and the
// attachment is "delete on termination";
// check if the related instance is being
// terminated, in which case we can stop
// waiting and skip destroying the volume.
//
// Note: we still accrue in "args" above
// in case the instance is not terminating;
// in that case we detach and destroy as
// usual.
deleteOnTermination = append(
deleteOnTermination, a.InstanceId,
)
}
}
}
if len(deleteOnTermination) > 0 {
result, err := client.Instances(deleteOnTermination, nil)
if err != nil {
return false, errors.Trace(err)
}
for _, reservation := range result.Reservations {
for _, instance := range reservation.Instances {
switch instance.State.Name {
case instanceStateShuttingDown, instanceStateTerminated:
// The instance is or will be terminated,
// and so the volume will be deleted by
// virtue of delete-on-termination.
return true, nil
}
}
}
}
if len(args) == 0 {
return false, nil
}
results, err := detachVolumes(client, args)
if err != nil {
return false, errors.Trace(err)
}
for _, err := range results {
if err != nil {
return false, errors.Trace(err)
}
}
return false, nil
})
if err != nil {
if err == errWaitVolumeTimeout {
return errors.Errorf("timed out waiting for volume %v to not be in-use", volumeId)
}
return errors.Trace(err)
}
if volume.Status == volumeStatusInUse {
// If the volume is in-use, that means it will be
// handled by delete-on-termination and we have
// nothing more to do.
return nil
}
if _, err := client.DeleteVolume(volumeId); err != nil {
return errors.Annotatef(err, "destroying %q", volumeId)
}
return nil
}