[PATCH] cache: Improve versions fields handling

[Richard Purdie <richard.purdie@linuxfoundation.org>]

Firstly, don't store the versions fields in memory in the cache objects
data store. This just complicates the code for no good reason.

Secondly, write the version fields to all cache files, not just the
core one. This makes everything consistent and easier.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/bitbake/lib/bb/cache.py b/bitbake/lib/bb/cache.py
index b90d488..d0fb234 100644
--- a/bitbake/lib/bb/cache.py
+++ b/bitbake/lib/bb/cache.py
@@ -290,25 +290,6 @@ class Cache(object):
             logger.info("Out of date cache found, rebuilding...")
 
     def load_cachefile(self):
-        # Firstly, using core cache file information for
-        # valid checking
-        with open(self.cachefile, "rb") as cachefile:
-            pickled = pickle.Unpickler(cachefile)
-            try:
-                cache_ver = pickled.load()
-                bitbake_ver = pickled.load()
-            except Exception:
-                logger.info('Invalid cache, rebuilding...')
-                return
-
-            if cache_ver != __cache_version__:
-                logger.info('Cache version mismatch, rebuilding...')
-                return
-            elif bitbake_ver != bb.__version__:
-                logger.info('Bitbake version mismatch, rebuilding...')
-                return
-
-
         cachesize = 0
         previous_progress = 0
         previous_percent = 0
@@ -326,7 +307,24 @@ class Cache(object):
             if type(cache_class) is type and issubclass(cache_class, RecipeInfoCommon):
                 cachefile = getCacheFile(self.cachedir, cache_class.cachefile, self.data_hash)
                 with open(cachefile, "rb") as cachefile:
-                    pickled = pickle.Unpickler(cachefile)                    
+                    pickled = pickle.Unpickler(cachefile)
+                    # Check cache version information
+                    try:
+                        cache_ver = pickled.load()
+                        bitbake_ver = pickled.load()
+                    except Exception:
+                        logger.info('Invalid cache, rebuilding...')
+                        return
+
+                    if cache_ver != __cache_version__:
+                        logger.info('Cache version mismatch, rebuilding...')
+                        return
+                    elif bitbake_ver != bb.__version__:
+                         logger.info('Bitbake version mismatch, rebuilding...')
+                         return
+
+                    # Load the rest of the cache file
+                    current_progress = 0
                     while cachefile:
                         try:
                             key = pickled.load()
@@ -608,9 +606,8 @@ class Cache(object):
                 cachefile = getCacheFile(self.cachedir, cache_class.cachefile, self.data_hash)
                 file_dict[cache_class_name] = open(cachefile, "wb")
                 pickler_dict[cache_class_name] =  pickle.Pickler(file_dict[cache_class_name], pickle.HIGHEST_PROTOCOL)
-                   
-        pickler_dict['CoreRecipeInfo'].dump(__cache_version__)
-        pickler_dict['CoreRecipeInfo'].dump(bb.__version__)
+                pickler_dict[cache_class_name].dump(__cache_version__)
+                pickler_dict[cache_class_name].dump(bb.__version__)
 
         try:
             for key, info_array in self.depends_cache.items():