Add support for passing the new size into StorageDevice.updateSize.

This is intended to be used under a very limited set of circumstances,
such as resize of inactive LVs from outside of blivet.

blivet/devices/btrfs.py

@@ -76,7 +76,7 @@ def update_sysfs_path(self):
         self.sysfs_path = self.parents[0].sysfs_path
         log.debug("%s sysfs_path set to %s", self.name, self.sysfs_path)
 
-    def update_size(self):
+    def update_size(self, newsize=None):
         pass
 
     def _post_create(self):

blivet/devices/container.py

@@ -191,5 +191,5 @@ def remove(self, member):
         if member in self.parents:
             self.parents.remove(member)
 
-    def update_size(self):
+    def update_size(self, newsize=None):
         pass

blivet/devices/md.py

@@ -235,12 +235,12 @@ def size(self):
 
         return size
 
-    def update_size(self):
+    def update_size(self, newsize=None):
         # container size is determined by the member disks, so there is nothing
         # to update in that case
         if self.type != "mdcontainer":
             # pylint: disable=bad-super-call
-            super(ContainerDevice, self).update_size()
+            super(ContainerDevice, self).update_size(newsize=newsize)
 
     @property
     def description(self):

blivet/devices/nfs.py

@@ -71,7 +71,7 @@ def destroy(self):
         """ Destroy the device. """
         log_method_call(self, self.name, status=self.status)
 
-    def update_size(self):
+    def update_size(self, newsize=None):
         pass
 
     @classmethod

blivet/devices/nodev.py

@@ -72,7 +72,7 @@ def destroy(self):
         log_method_call(self, self.name, status=self.status)
         self._pre_destroy()
 
-    def update_size(self):
+    def update_size(self, newsize=None):
         pass
 
 

blivet/devices/storage.py

@@ -589,9 +589,24 @@ def current_size(self):
             self._current_size = self.read_current_size()
         return self._current_size
 
-    def update_size(self):
-        """ Update size, current_size, and target_size to actual size. """
-        self._current_size = Size(0)
+    def update_size(self, newsize=None):
+        """ Update size, current_size, and target_size to actual size.
+
+            :keyword :class:`~.size.Size` newsize: new size for device
+
+            .. note::
+
+                Most callers will not pass a new size. It is for special cases
+                like outside resize of inactive LVs, which precludes updating
+                the size from /sys.
+        """
+        if newsize is None:
+            self._currentSize = Size(0)
+        elif isinstance(newsize, Size):
+            self._currentSize = newsize
+        else:
+            raise ValueError("new size must be an instance of class Size")
+
         new_size = self.current_size
         self._size = new_size
         self._target_size = new_size  # bypass setter checks