vm: add RecoverOperation

circle/vm/models/instance.py

@@ -264,6 +264,7 @@ class Instance(AclBase, VirtualMachineDescModel, StatusModel, OperatedMixin,
             ('change_resources', _('Can change resources of a running VM.')),
             ('set_resources', _('Can change resources of a new VM.')),
             ('config_ports', _('Can configure port forwards.')),
+            ('recover', _('Can recover a destroyed VM.')),
         )
         verbose_name = _('instance')
         verbose_name_plural = _('instances')

circle/vm/operations.py

@@ -628,3 +628,30 @@ class ScreenshotOperation(InstanceOperation):
 
 
 register_operation(ScreenshotOperation)
+
+
+class RecoverOperation(InstanceOperation):
+    activity_code_suffix = 'recover'
+    id = 'recover'
+    name = _("recover")
+    description = _("Recover virtual machine from destroyed state.")
+    acl_level = "owner"
+    required_perms = ('vm.recover', )
+
+    def check_precond(self):
+        if not self.instance.destroyed_at:
+            raise self.instance.WrongStateError(self.instance)
+
+    def on_commit(self, activity):
+        activity.resultant_state = 'PENDING'
+
+    def _operation(self):
+        for disk in self.instance.disks.all():
+            disk.destroyed = None
+            disk.restore()
+            disk.save()
+        self.instance.destroyed_at = None
+        self.instance.save()
+
+
+register_operation(RecoverOperation)