Add a dry-run param to args validation (#913)

* Add a dry-run param to args validation

* Update docstrings

dftimewolf/cli/dftimewolf_recipes.py

@@ -310,9 +310,12 @@ def ParseArguments(self, arguments: List[str]) -> None:
 
     self._state.command_line_options = vars(self._command_line_options)
 
-  def ValidateArguments(self) -> None:
+  def ValidateArguments(self, dry_run: bool=False) -> None:
     """Validate the arguments.
 
+    Args:
+      dry_run: True if the tool is only testing parameters, False otherwise.
+
     Raises:
       errors.CriticalError: If one or more arguments could not be validated.
     """
@@ -329,7 +332,7 @@ def ValidateArguments(self) -> None:
       if argument_mandatory or argument_value is not None:
         try:
           valid_value = validators_manager.ValidatorsManager.Validate(
-              argument_value, arg)
+              argument_value, arg, dry_run)
           self.state.command_line_options[switch] = valid_value
         except errors.RecipeArgsValidationFailure as exception:
           error_messages.append(
@@ -519,7 +522,7 @@ def RunTool(cdm: Optional[CursesDisplayManager] = None) -> int:
     recipe_name)
 
   try:
-    tool.ValidateArguments()
+    tool.ValidateArguments(tool.dry_run)
   except errors.CriticalError as exception:
     if cdm:
       cdm.EnqueueMessage('dftimewolf', str(exception), True)

dftimewolf/lib/args_validator.py

@@ -12,8 +12,13 @@ class AbstractValidator(abc.ABC):
 
   NAME: str = None  # type: ignore
 
-  def __init__(self) -> None:
-    """Initialize."""
+  def __init__(self, dry_run: bool=False) -> None:
+    """Initialize.
+
+    Args:
+      dry_run: True if the tool is only testing parameters, False otherwise.
+    """
+    self._dry_run = dry_run
 
   @abc.abstractmethod
   def Validate(self,

dftimewolf/lib/validators/manager.py

@@ -92,12 +92,14 @@ def GetValidatorByName(
   @classmethod
   def Validate(cls,
                argument_value: Any,
-               recipe_argument: resources.RecipeArgument) -> Any:
+               recipe_argument: resources.RecipeArgument,
+               dry_run: bool=False) -> Any:
     """Validate an argument value.
 
     Args:
       argument_value: The argument value to validate.
       recipe_argument: The definition of the argument.
+      dry_run: True if the tool is only testing parameters, False otherwise.
 
     Returns:
       The validated argument value. If the recipe argument doesn't specify a
@@ -116,6 +118,6 @@ def Validate(cls,
           f'{validator_name} is not a registered validator')
 
     validator_class = cls._validator_classes[validator_name]
-    validator = validator_class()
+    validator = validator_class(dry_run)
 
     return validator.Validate(argument_value, recipe_argument)