Add a yaml sdb module (#37563)

* Add a yaml sdb module

* Fix bad release codename

* Add default to profile argument

salt/sdb/yaml.py

@@ -0,0 +1,87 @@
+# -*- coding: utf-8 -*-
+'''
+Pull sdb values from a YAML file
+
+:maintainer:    SaltStack
+:maturity:      New
+:platform:      all
+
+.. versionadded:: Nitrogen
+
+Configuration:
+
+.. code-block:: yaml
+
+    my-yaml-file:
+      driver: yaml
+      files:
+        - /path/to/foo.yaml
+        - /path/to/bar.yaml
+
+The files are merged together and the result is searched using the same
+mechanism Salt uses for searching Grains and Pillar data structures.
+
+Optional configuration:
+
+.. code-block:: yaml
+
+    my-yaml-file:
+      driver: yaml
+      files:
+        - /path/to/foo.yaml
+        - /path/to/bar.yaml
+      merge:
+        strategy: smart
+        merge_list: false
+'''
+
+# import python libs
+from __future__ import absolute_import
+import logging
+
+import salt.exceptions
+import salt.loader
+import salt.utils
+import salt.utils.dictupdate
+
+log = logging.getLogger(__name__)
+
+__func_alias__ = {
+    'set_': 'set'
+}
+
+
+def set_(*args, **kwargs):
+    '''
+    Setting a value is not supported; edit the YAML files directly
+    '''
+    raise salt.exceptions.NotImplemented()
+
+
+def get(key, profile=None):  # pylint: disable=W0613
+    '''
+    Get a value from the REST interface
+    '''
+    data = _get_values(profile)
+    return salt.utils.traverse_dict_and_list(data, key, None)
+
+
+def _get_values(profile=None):
+    '''
+    Retrieve all the referenced files, deserialize, then merge them together
+    '''
+    profile = profile or {}
+    serializers = salt.loader.serializers(__opts__)
+
+    ret = {}
+    for fname in profile.get('files', []):
+        try:
+            with salt.utils.flopen(fname) as f:
+                contents = serializers.yaml.deserialize(f)
+                ret = salt.utils.dictupdate.merge(ret, contents,
+                        **profile.get('merge', {}))
+        except IOError:
+            log.error("File not found '{0}'".format(fname))
+        except TypeError:
+            log.error("Error deserializing sdb file '{0}'".format(fname))
+    return ret