Make gn.py support root directories other than 'src'.

gclient_utils.py

 # Copyright (c) 2012 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.
 
 """Generic utils."""
 
 import codecs
 import cStringIO
 import datetime
 import logging
@@ skipping 663 matching lines @@
       top_dir[0] = os.path.normpath(line.rstrip('\n'))
     try:
       CheckCallAndFilter(["git", "rev-parse", "--show-toplevel"],
                          print_stdout=False, filter_fn=filter_fn)
     except Exception:
       pass
     top_dir = top_dir[0]
     if os.path.exists(os.path.join(top_dir, 'buildtools')):
       return os.path.join(top_dir, 'buildtools')
     return None
-  return os.path.join(gclient_root, 'src', 'buildtools')
+
+  # Some projects' top directory is not named 'src'.
+  source_dir_name = GetGClientPrimarySolutionName(gclient_root) or 'src'
+  return os.path.join(gclient_root, source_dir_name, 'buildtools')
 
 
 def GetBuildtoolsPlatformBinaryPath():
   """Returns the full path to the binary directory for the current platform."""
   # Mac and Windows just have one directory, Linux has two according to whether
   # it's 32 or 64 bits.
   buildtools_path = GetBuildtoolsPath()
   if not buildtools_path:
     return None
 
@@ skipping 11 matching lines @@
   return os.path.join(buildtools_path, subdir)
 
 
 def GetExeSuffix():
   """Returns '' or '.exe' depending on how executables work on this platform."""
   if sys.platform.startswith(('cygwin', 'win')):
     return '.exe'
   return ''
 
 
+def GetGClientPrimarySolutionName(gclient_root_dir_path):
+  """Returns the name of the primary solution in the .gclient file specified."""
+  gclient_config_file = os.path.join(gclient_root_dir_path, '.gclient')
+  env = {}
+  execfile(gclient_config_file, env)
+  solutions = env.get('solutions', [])
+  if solutions:
+    return solutions[0].get('name')
+  return None
+
+
 def GetGClientRootAndEntries(path=None):
   """Returns the gclient root and the dict of entries."""
   config_file = '.gclient_entries'
   root = FindFileUpwards(config_file, path)
   if not root:
     print "Can't find %s" % config_file
     return None
   config_path = os.path.join(root, config_file)
   env = {}
   execfile(config_path, env)
@@ skipping 415 matching lines @@
 def DefaultIndexPackConfig(url=''):
   """Return reasonable default values for configuring git-index-pack.
 
   Experiments suggest that higher values for pack.threads don't improve
   performance."""
   cache_limit = DefaultDeltaBaseCacheLimit()
   result = ['-c', 'core.deltaBaseCacheLimit=%s' % cache_limit]
   if url in THREADED_INDEX_PACK_BLACKLIST:
     result.extend(['-c', 'pack.threads=1'])
   return result