Add the ability to dump initial recipe properties.

recipes.py

 #!/usr/bin/env python
 # Copyright 2015 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 """Tool to interact with recipe repositories.
 
 This tool operates on the nearest ancestor directory containing an
 infra/config/recipes.cfg.
 """
@@ skipping 139 matching lines @@
     os.makedirs(workdir)
 
   old_cwd = os.getcwd()
   os.chdir(workdir)
   stream_engine = stream.ProductStreamEngine(
       stream.StreamEngineInvariants(),
       stream.AnnotatorStreamEngine(
         sys.stdout, emit_timestamps=(args.timestamps or
                                      op_args.annotation_flags.emit_timestamp)))
   with stream_engine:
+    # Emit initial properties if configured to do so.
+    if op_args.annotation_flags.emit_initial_properties:
+      with stream_engine.new_step_stream('Initial Properties') as s:
+        for key in sorted(properties.iterkeys()):
+          s.set_build_property(key, json.dumps(properties[key], sort_keys=True))
+
     try:
       ret = recipe_run.run_steps(
           properties, stream_engine,
           step_runner.SubprocessStepRunner(stream_engine),
           universe_view=universe_view)
     finally:
       os.chdir(old_cwd)
 
     return handle_recipe_return(ret, args.output_result_json, stream_engine)
 
@@ skipping 390 matching lines @@
   ret = main()
   if not isinstance(ret, int):
     if ret is None:
       ret = 0
     else:
       print >> sys.stderr, ret
       ret = 1
   sys.stdout.flush()
   sys.stderr.flush()
   os._exit(ret)