[poky] [PATCH 2/4][Image Creator]Put extra requested fields into different cache files

[Liping Ke]

From: Liping Ke <liping.ke at intel.com>

This patch splits Cache Data Retrieve method from Data Fields.
Data Retrive methods will be reused by Extra Cache Data fields.
It is independent Class methods for data retrieving.

Signed-off-by: Liping Ke <liping.ke at intel.com>
---
 bitbake/lib/bb/cache.py |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/bitbake/lib/bb/cache.py b/bitbake/lib/bb/cache.py
index c86aa14..dec8bdd 100644
--- a/bitbake/lib/bb/cache.py
+++ b/bitbake/lib/bb/cache.py
@@ -83,7 +83,7 @@ recipe_fields = (
 )
 
 
-class RecipeInfo(namedtuple('RecipeInfo', recipe_fields)):
+class RecipeRetrieve():
     __slots__ = ()
 
     @classmethod
@@ -117,6 +117,7 @@ class RecipeInfo(namedtuple('RecipeInfo', recipe_fields)):
     def getvar(cls, var, metadata):
         return metadata.getVar(var, True) or ''
 
+class RecipeInfo(namedtuple('RecipeInfo', recipe_fields), RecipeRetrieve):
     @classmethod
     def make_optional(cls, default=None, **kwargs):
         """Construct the namedtuple from the specified keyword arguments,
-- 
1.7.0.4