Fixes #57 (#67)

tests/spec_test.py

@@ -202,6 +202,18 @@ def test_load_config_multi_part_dictionary(spec_with_dicts):
                                  'port': 1234}
 
 
+@patch('os.path.isfile', Mock(return_value=True))
+def test_migrate_config_file():
+    spec = YapconfSpec({'foo': {'bootstrap': True}})
+    with patch('yapconf.open', mock_open(read_data='{}')):
+        config = spec.migrate_config_file(
+            '/path/to/file',
+            create=False,
+            include_bootstrap=False
+        )
+    assert config == {}
+
+
 @patch('os.path.isfile', Mock(return_value=True))
 def test_migrate_config_file_no_changes(basic_spec):
     open_path = 'yapconf.open'

yapconf/spec.py

@@ -261,6 +261,7 @@ def migrate_config_file(
         create=True,
         update_defaults=True,
         dump_kwargs=None,
+        include_bootstrap=True,
     ):
         """Migrates a configuration file.
 
@@ -303,6 +304,7 @@ def migrate_config_file(
             update_defaults (bool): Update values that have a value set to
                 something listed in the previous_defaults
             dump_kwargs (dict): A key-value pair that will be passed to dump
+            include_bootstrap (bool): Include bootstrap items in the output
 
         Returns:
             box.Box: The newly migrated configuration.
@@ -317,7 +319,15 @@ def migrate_config_file(
                                                     current_file_type)
 
         migrated_config = {}
-        for item in self._yapconf_items.values():
+
+        if include_bootstrap:
+            items = self._yapconf_items.values()
+        else:
+            items = [
+                item for item in self._yapconf_items.values()
+                if not item.bootstrap
+            ]
+        for item in items:
             item.migrate_config(current_config, migrated_config,
                                 always_update, update_defaults)