[schema] Add a constraint on process_input_file preventing usage of script's file

migration/0.2.0_Any.py

@@ -42,5 +42,5 @@ add_relation_type('process_stderr')
 
 sync_schema_props_perms('DataTransformationProcess')
 sync_schema_props_perms('DataValidationProcess')
-sync_schema_props_perms('process_input_file', syncprops=False)
+sync_schema_props_perms('process_input_file')
 sync_schema_props_perms('File', syncprops=False)

schema.py

@@ -20,7 +20,7 @@ from yams.buildobjs import (ComputedRelation, EntityType, RelationDefinition,
                             Int, String)
 
 from cubicweb.schema import (RRQLExpression, ERQLExpression,
-                             WorkflowableEntityType)
+                             RQLConstraint, WorkflowableEntityType)
 
 from cubes.file.schema import File
 
@@ -70,6 +70,10 @@ class process_input_file(RelationDefinition):
     object = 'File'
     cardinality = '?*'
     description = _('input file of the data process')
+    constraints = [
+        RQLConstraint('NOT EXISTS(SC implemented_by O)',
+                      msg=_('file is used by a script')),
+    ]
 
 
 class validated_by(RelationDefinition):