// machineVolumeParams retrieves VolumeParams for the volumes that should be
// provisioned with, and attached to, the machine. The client should ignore
// parameters that it does not know how to handle.
func (p *ProvisionerAPI) machineVolumeParams(m *state.Machine) ([]params.VolumeParams, error) {
volumeAttachments, err := m.VolumeAttachments()
if err != nil {
return nil, err
}
if len(volumeAttachments) == 0 {
return nil, nil
}
envConfig, err := p.st.EnvironConfig()
if err != nil {
return nil, err
}
poolManager := poolmanager.New(state.NewStateSettings(p.st))
allVolumeParams := make([]params.VolumeParams, 0, len(volumeAttachments))
for _, volumeAttachment := range volumeAttachments {
volumeTag := volumeAttachment.Volume()
volume, err := p.st.Volume(volumeTag)
if err != nil {
return nil, errors.Annotatef(err, "getting volume %q", volumeTag.Id())
}
storageInstance, err := storagecommon.MaybeAssignedStorageInstance(
volume.StorageInstance, p.st.StorageInstance,
)
if err != nil {
return nil, errors.Annotatef(err, "getting volume %q storage instance", volumeTag.Id())
}
volumeParams, err := storagecommon.VolumeParams(volume, storageInstance, envConfig, poolManager)
if err != nil {
return nil, errors.Annotatef(err, "getting volume %q parameters", volumeTag.Id())
}
provider, err := registry.StorageProvider(storage.ProviderType(volumeParams.Provider))
if err != nil {
return nil, errors.Annotate(err, "getting storage provider")
}
if provider.Dynamic() {
// Leave dynamic storage to the storage provisioner.
continue
}
volumeAttachmentParams, ok := volumeAttachment.Params()
if !ok {
// Attachment is already provisioned; this is an insane
// state, so we should not proceed with the volume.
return nil, errors.Errorf(
"volume %s already attached to machine %s",
volumeTag.Id(), m.Id(),
)
}
// Not provisioned yet, so ask the cloud provisioner do it.
volumeParams.Attachment = ¶ms.VolumeAttachmentParams{
volumeTag.String(),
m.Tag().String(),
"", // we're creating the volume, so it has no volume ID.
"", // we're creating the machine, so it has no instance ID.
volumeParams.Provider,
volumeAttachmentParams.ReadOnly,
}
allVolumeParams = append(allVolumeParams, volumeParams)
}
return allVolumeParams, nil
}