Fix determining save_output_streams value through configuration

cdist/configuration.py

@@ -78,6 +78,9 @@ class OptionBase:
         else:
             return newval
 
+    def should_override(self, currval, newval):
+        return True
+
 
 class StringOption(OptionBase):
     def __init__(self, name):
@@ -98,8 +101,12 @@ class StringOption(OptionBase):
 class BooleanOption(OptionBase):
     BOOLEAN_STATES = configparser.ConfigParser.BOOLEAN_STATES
 
-    def __init__(self, name):
+    # If default_overrides is False then previous config value will not be
+    # overriden with default_value.
+    def __init__(self, name, default_overrides=True, default_value=True):
         super().__init__(name)
+        self.default_overrides = default_overrides
+        self.default_value = default_value
 
     def get_converter(self):
         def boolean_converter(val):
@@ -113,6 +120,11 @@ class BooleanOption(OptionBase):
     def translate(self, val):
         return self.BOOLEAN_STATES[val]
 
+    def should_override(self, currval, newval):
+        if not self.default_overrides:
+            return newval != self.default_value
+        return True
+
 
 class IntOption(OptionBase):
     def __init__(self, name):
@@ -286,7 +298,8 @@ class Configuration(metaclass=Singleton):
             'parallel': JobsOption('parallel'),
             'verbosity': VerbosityOption(),
             'archiving': ArchivingOption(),
-            'save_output_streams': BooleanOption('save_output_streams'),
+            'save_output_streams': BooleanOption('save_output_streams',
+                                                 default_overrides=False),
         },
     }
 
@@ -434,6 +447,7 @@ class Configuration(metaclass=Singleton):
             else:
                 currval = None
             option_object = self.CONFIG_FILE_OPTIONS[section][option]
+            if option_object.should_override(currval, newval):
                 config[section][option] = option_object.update_value(
                     currval, newval, update_appends)
 

cdist/test/configuration/__init__.py

@@ -1208,7 +1208,7 @@ class ConfigurationTestCase(test.CdistTestCase):
 
         expected_config_dict = {
             'GLOBAL': {
-                'save_output_streams': True,
+                'save_output_streams': False,
                 'verbosity': 0,
             },
         }

docs/changelog

@@ -11,6 +11,7 @@ next:
 	* Core: Fix main and inventory parent argparse options (Darko Poljak)
 	* Core: Fix lost error info with parallel jobs (option -j) (Darko Poljak)
 	* Core: Fix determining beta value through configuration (Darko Poljak)
+	* Core: Fix determining save_output_streams value through configuration (Darko Poljak)
 
 4.8.0: 2018-02-14
 	* Core: Skip empty lines in parameter files (Darko Poljak)