Add fallback to DEPS from a missing deps file.

gclient.py

 #!/usr/bin/env python
 # 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.
 
 """Meta checkout manager supporting both Subversion and GIT."""
 # Files
 #   .gclient      : Current client configuration, written by 'config' command.
 #                   Format is a Python script defining 'solutions', a list whose
 #                   entries each are maps binding the strings "name" and "url"
@@ skipping 517 matching lines @@
     new_deps.update(target_os_deps)
     return new_deps
 
   def ParseDepsFile(self):
     """Parses the DEPS file for this dependency."""
     assert not self.deps_parsed
     assert not self.dependencies
 
     deps_content = None
     use_strict = False
-    filepath = os.path.join(self.root.root_dir, self.name, self.deps_file)
-    if not os.path.isfile(filepath):
+
+    # First try to locate the configured deps file.  If it's missing, fallback
+    # to DEPS.
+    deps_files = set([self.deps_file, 'DEPS'])

[iannucci, 2014/07/01 22:13:58]

yeah but order is still important and set() ordering is the same as dict
ordering (read: not defined).

+    for deps_file in deps_files:
+      filepath = os.path.join(self.root.root_dir, self.name, deps_file)
+      if os.path.isfile(filepath):
+        logging.info(
+            'ParseDepsFile(%s): %s file found at %s' % (
+              self.name, deps_file, filepath))
+        break
       logging.info(
           'ParseDepsFile(%s): No %s file found at %s' % (
-            self.name, self.deps_file, filepath))
-    else:
+            self.name, deps_file, filepath))
+
+    if os.path.isfile(filepath):
       deps_content = gclient_utils.FileRead(filepath)
       logging.debug('ParseDepsFile(%s) read:\n%s' % (self.name, deps_content))
       use_strict = 'use strict' in deps_content.splitlines()[0]
 
     local_scope = {}
     if deps_content:
       # One thing is unintuitive, vars = {} must happen before Var() use.
       var = self.VarImpl(self.custom_vars, local_scope)
       if use_strict:
         logging.info(
@@ skipping 1479 matching lines @@
     print >> sys.stderr, 'Error: %s' % str(e)
     return 1
   finally:
     gclient_utils.PrintWarnings()
 
 
 if '__main__' == __name__:
   sys.exit(Main(sys.argv[1:]))
 
 # vim: ts=2:sw=2:tw=80:et: