Add a basic method for checking the minimal size needed for a backend

Add a basic way to query a backend for how much space is needed on a
per-partition basis.  This isn't always able to be known and if it's
unknown, then you'll get back 0.  Add the implementation for / on
livecd

1 files changed, 4 insertions, 0 deletions

diff --git a/backend.py b/backend.py
index ad0285eed..300867146 100644
--- a/backend.py
+++ b/backend.py
@@ -188,6 +188,10 @@ class AnacondaBackend:
     def kernelVersionList(self, rootPath="/"):
         return []
 
+    def getMinimumSizeMB(self, part):
+        """Return the minimal size for part in megabytes if we can."""
+        return 0
+
     def doBackendSetup(self, anaconda):
         log.warning("doBackendSetup not implemented for backend!")
         raise NotImplementedError