suspend to disk? #411

* Error handler in case of error when saving domain state with a hint
how to handle the problem. 
* Managed saves are deleted prior to undefining a domain.

Task-Url: https://github.com/pradels/vagrant-libvirt/issues/411
Signed-off-by: Max Kutsevol <max@coolvds.com>

lib/vagrant-libvirt/action/destroy_domain.rb

@@ -28,6 +28,11 @@ module VagrantPlugins
             end
           end
 
+          # must remove managed saves
+          if libvirt_domain.has_managed_save?
+            libvirt_domain.managed_save_remove
+          end
+
           domain = env[:machine].provider.driver.connection.servers.get(env[:machine].id.to_s)
 
           if env[:machine].provider_config.disks.empty?

lib/vagrant-libvirt/action/suspend_domain.rb

@@ -20,7 +20,12 @@ module VagrantPlugins
           config = env[:machine].provider_config
           if config.suspend_mode == 'managedsave'
             libvirt_domain =  env[:machine].provider.driver.connection.client.lookup_domain_by_uuid(env[:machine].id)
-            libvirt_domain.managed_save
+            begin
+              libvirt_domain.managed_save
+            rescue => e
+              env[:ui].error("Error doing a managed save for domain. It may have entered a paused state.
+                Check the output of `virsh managedsave DOMAIN_NAME --verbose` on the VM host, error: #{e.message}")
+            end
           else
             domain.suspend
           end