CrOS: Load Chromite pins from JSON.

masters/master.chromiumos/chromiumos_board_config.py

 # Copyright (c) 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import collections
 import logging
 import sys
 
+from common.cros_chromite import Get, ChromiteTarget
 from common.slave_alloc import SlaveAllocator
-from common.cros_chromite import Get, ChromiteTarget
 from master.cros import builder_config
 
 
 # Declare a slave allocator. We do this here so we can access the slaves
 # configured by 'slaves.cfg' in 'master.cfg'.
 slave_allocator = SlaveAllocator()
 
 
 # Get the pinned Chromite configuration.
 cbb_config = Get(allow_fetch=True)
 
 
 # Select any board that is configured to build on this waterfall.
 def _GetWaterfallTargets():
   result = collections.OrderedDict()
   for config in cbb_config.itervalues():
     if config.get('active_waterfall') != 'chromiumos':
       continue
     result[config.name] = config
   return result
 waterfall_targets = _GetWaterfallTargets()
 
 
 # Load the builder configs.
 builder_configs = builder_config.GetBuilderConfigs(waterfall_targets)
 builder_name_map = dict((c.builder_name, c)
                         for c in builder_configs.itervalues())