install: fix command line option validation

The code which calls the validators was accidentally removed, re-add it.

https://fedorahosted.org/freeipa/ticket/5386
https://fedorahosted.org/freeipa/ticket/5391
https://fedorahosted.org/freeipa/ticket/5392

Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>

ipapython/install/cli.py

@@ -282,7 +282,8 @@ class ConfigureTool(admintool.AdminTool):
         kwargs = {}
 
         transformed_cls = self._transform(self.configurable_class)
-        for owner_cls, name in transformed_cls.knobs():
+        knob_classes = {n: getattr(c, n) for c, n in transformed_cls.knobs()}
+        for name in knob_classes:
             value = getattr(self.options, name, None)
             if value is not None:
                 kwargs[name] = value
@@ -294,8 +295,10 @@ class ConfigureTool(admintool.AdminTool):
         try:
             cfgr = transformed_cls(**kwargs)
         except core.KnobValueError as e:
-            knob_cls = getattr(transformed_cls, e.name)
+            knob_cls = knob_classes[e.name]
             try:
+                if self.positional_arguments is None:
+                    raise IndexError
                 index = self.positional_arguments.index(e.name)
             except IndexError:
                 cli_name = knob_cls.cli_name or e.name.replace('_', '-')

ipapython/install/core.py

@@ -118,6 +118,16 @@ class KnobBase(PropertyBase):
     def __init__(self, outer):
         self.outer = outer
 
+    def __set__(self, obj, value):
+        try:
+            self.validate(value)
+        except KnobValueError:
+            raise
+        except ValueError as e:
+            raise KnobValueError(self.__outer_name__, str(e))
+
+        super(KnobBase, self).__set__(obj, value)
+
     def validate(self, value):
         pass
 
@@ -243,7 +253,8 @@ class Configurable(six.with_metaclass(abc.ABCMeta, object)):
             except KeyError:
                 pass
             else:
-                setattr(self, name, value)
+                prop = prop_cls(self)
+                prop.__set__(self, value)
 
         if kwargs:
             extra = sorted(kwargs)