support _path for symlinkoption and root OD

tiramisu/option/baseoption.py

@@ -298,7 +298,8 @@ class Base:
                 _setattr(self, '_extra', tuple([tuple(extra.keys()), tuple(extra.values())]))
 
     def impl_is_readonly(self) -> str:
-        return not isinstance(getattr(self, '_informations', dict()), dict)
+        # _path is None when initialise SymlinkOption
+        return hasattr(self, '_path') and self._path is not None
 
     def impl_getproperties(self) -> FrozenSet[str]:
         return getattr(self, '_properties', frozenset())

tiramisu/option/optiondescription.py

@@ -150,9 +150,8 @@ class CacheOptionDescription(BaseOption):
                                             raise ValueError(_('malformed requirements option "{0}" '
                                                                'must not be a multi for "{1}"').format(
                                                                    require_opt.impl_getname(), option.impl_getname()))
-            if not hasattr(option, '_path'):
-                option._path = subpath
-                option._set_readonly()
+            option._path = subpath
+            option._set_readonly()
         if init:
             if __debug__ and len(cache_option) != len(set(cache_option)):
                 for idx in range(1, len(cache_option) + 1):
@@ -169,6 +168,7 @@ class CacheOptionDescription(BaseOption):
                                                 opt.impl_getname()))
                     self._cache_consistencies[opt] = tuple(cons)
             self._cache_force_store_values = force_store_values
+            self._path = subpath
             self._set_readonly()
 
     def impl_build_force_store_values(self,

tiramisu/option/symlinkoption.py

@@ -38,6 +38,7 @@ class SymLinkOption(BaseOption):
         _setattr(self, '_name', name)
         _setattr(self, '_opt', opt)
         opt._add_dependency(self)
+        self._path = None
 
     def __getattr__(self,
                     name: str) -> Any: