recipe_engine: change resource API to use repo root

recipe_engine/package.py

 # Copyright 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 ast
 import collections
 import contextlib
 import copy
 import functools
 import itertools
@@ skipping 337 matching lines @@
       return False
     return self._proto_file == other._proto_file
 
 
 class Package(object):
   """Package represents a loaded package, and contains path and dependency
   information.
 
   This is accessed by loader.py through RecipeDeps.get_package.
   """
-  def __init__(self, name, repo_spec, deps, recipes_dir):
+  def __init__(self, name, repo_spec, deps, repo_root, recipes_dir):
     self.name = name
     self.repo_spec = repo_spec
     self.deps = deps
+    self.repo_root = repo_root
     self.recipes_dir = recipes_dir
 
   def __repr__(self):
     return '<Package(name=%r,repo_spec=%r,deps=%r,recipes_dir=%r)>' % (
         self.name, self.repo_spec, self.deps, self.recipes_dir)
 
   @property
   def recipe_dirs(self):
     return [os.path.join(self.recipes_dir, 'recipes')]
 
@@ skipping 251 matching lines @@
             'Package specs do not match: %s vs %s' %
             (repo_spec, self._packages[project_id].repo_spec))
     self._packages[project_id] = None
 
     deps = {}
     for dep, dep_repo in sorted(package_spec.deps.items()):
       deps[dep] = self._create_package(dep_repo, allow_fetch)
 
     package = Package(
         project_id, repo_spec, deps,
+        repo_spec.repo_root(self._context),
         os.path.join(repo_spec.repo_root(self._context),
                      package_spec.recipes_path))
 
     self._packages[project_id] = package
     return package
 
   # TODO(luqui): Remove this, so all accesses to packages are done
   # via other packages with properly scoped deps.
   def get_package(self, package_id):
     return self._packages[package_id]
@@ skipping 82 matching lines @@
   >>> d = { 'x': 1, 'y': 2 }
   >>> sorted(_updated(d, { 'y': 3, 'z': 4 }).items())
   [('x', 1), ('y', 3), ('z', 4)]
   >>> sorted(d.items())
   [('x', 1), ('y', 2)]
   """
 
   d = copy.copy(d)
   d.update(updates)
   return d