add the readfile action, hack the constraints to make it work

1 files changed, 4 insertions, 1 deletions

diff --git a/tutorius/constraints.py b/tutorius/constraints.py
index 36abdfb..e91f23a 100644
--- a/tutorius/constraints.py
+++ b/tutorius/constraints.py
@@ -200,7 +200,10 @@ class FileConstraint(Constraint):
     def validate(self, value):
         # TODO : Decide on the architecture for file retrieval on disk
         # Relative paths? From where? Support macros?
-        # 
+        # FIXME This is a hack to make cases where a default file is not valid
+        # work. It allows None values to be validated, though
+        if value is None:
+            return
         if not os.path.isfile(value):
             raise FileConstraintError("Non-existing file : %s"%value)
         return