Add `slave_alloc_update` tool.

scripts/common/chromium_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.
 
 """ Set of basic operations/utilities that are used by the build. """
 
 from contextlib import contextmanager
 import ast
 import base64
 import cStringIO
@@ skipping 1242 matching lines @@
   path = os.path.join(BUILD_DIR, 'masters/*/' + cue)
   filenames = []
   if include_public:
     filenames += glob.glob(path)
   if include_internal:
     filenames += glob.glob(path_internal)
   return [os.path.abspath(os.path.dirname(f)) for f in filenames]
 
 
 def MasterPath(mastername, include_public=True, include_internal=True):
-  path = os.path.join(BUILD_DIR, 'masters', 'master.%s' % mastername)
-  path_internal = os.path.join(
-      BUILD_DIR, os.pardir, 'build_internal', 'masters',
-      'master.%s' % mastername)
-  if include_public and os.path.isdir(path):
-    return path
-  if include_internal and os.path.isdir(path_internal):
-    return path_internal
+  if not mastername.startswith('master.'):

[ghost stip (do not use), 2015/10/21 16:26:06]

weird. that should be for a user-facing util, not down in the bowels of
chromium_utils

+    mastername = 'master.' + mastername
+
+  for inc, base in (
+      (include_public, env.Build),
+      (include_internal, env.BuildInternal)):
+    if inc and base:
+      path = os.path.join(base, 'masters', mastername)
+      if os.path.isdir(path):
+        return path
   raise LookupError('Path for master %s not found' % mastername)
 
 
 def ListMastersWithSlaves(include_public=True, include_internal=True):
   masters_path = ListMasters('builders.pyl', include_public, include_internal)
   masters_path.extend(ListMasters('slaves.cfg', include_public,
                                   include_internal))
   return masters_path
 
 
@@ skipping 85 matching lines @@
       yield
     finally:
       os.chdir(old_cwd)
 
 
 def ParsePythonCfg(cfg_filepath, fail_hard=False):
   """Retrieves data from a python config file."""
   if not os.path.exists(cfg_filepath):
     return None
 
-  # Execute 'slaves.sfg' in the master path environment.
+  # Execute 'slaves.cfg' in the master path environment.
   with MasterEnvironment(os.path.dirname(os.path.abspath(cfg_filepath))):
     try:
       local_vars = {}
       execfile(os.path.join(cfg_filepath), local_vars)
       del local_vars['__builtins__']
       return local_vars
     except Exception as e:
       # pylint: disable=C0323
       print >>sys.stderr, 'An error occurred while parsing %s: %s' % (
           cfg_filepath, e)
@@ skipping 541 matching lines @@
     return False
   # Matches e.g. "cl_x86 = path/to/clang-cl.exe"
   clang_cl_re = re.compile(
       r'^cl_x\d\d\s+\=\s+(?P<compiler_path>[^ ]+)\s.*$',
       re.VERBOSE)
   for line in open(build_file):
     m = clang_cl_re.match(line)
     if m:
       return 'clang' in m.group('compiler_path')
   return False