Assert when source is an absoluth path

pylib/gyp/generator/ninja.py

 # Copyright (c) 2013 Google Inc. 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 copy
 import hashlib
 import json
 import multiprocessing
 import os.path
@@ skipping 322 matching lines @@
     # Why this scheme and not some other one?
     # 1) for a given input, you can compute all derived outputs by matching
     #    its path, even if the input is brought via a gyp file with '..'.
     # 2) simple files like libraries and stamps have a simple filename.
 
     obj = 'obj'
     if self.toolset != 'target':
       obj += '.' + self.toolset
 
     path_dir, path_basename = os.path.split(path)
+    assert not os.path.isabs(path_dir), (
+        "'%s' can not be absolute path (see crbug.com/462153)." % path_dir)
+
     if qualified:
       path_basename = self.name + '.' + path_basename
     return os.path.normpath(os.path.join(obj, self.base_dir, path_dir,
                                          path_basename))
 
   def WriteCollapsedDependencies(self, name, targets, order_only=None):
     """Given a list of targets, return a path for a single file
     representing the result of building all the targets or None.
 
     Uses a stamp file if necessary."""
@@ skipping 2032 matching lines @@
           arglists.append(
               (target_list, target_dicts, data, params, config_name))
         pool.map(CallGenerateOutputForConfig, arglists)
       except KeyboardInterrupt, e:
         pool.terminate()
         raise e
     else:
       for config_name in config_names:
         GenerateOutputForConfig(target_list, target_dicts, data, params,
                                 config_name)