Track step nesting in StreamEngine.

recipe_modules/generator_script/api.py

 # Copyright 2013 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.
 
 from recipe_engine import recipe_api
 
 class GeneratorScriptApi(recipe_api.RecipeApi):
   def __call__(self, path_to_script, *args, **kwargs):
     """Run a script and generate the steps emitted by that script.
 
@@ skipping 12 matching lines @@
       env: a {key:value} dictionary of the environment variables to override.
        every value is formatted with the current environment with the python
        % operator, so a value of "%(PATH)s:/some/other/path" would resolve to
        the current PATH value, concatenated with ":/some/other/path"
 
       ok_ret: a list of non-error return codes. This defaults to [0]
 
       infra_step: a bool which indicates that failures in this step are 'infra'
         failures and should abort with a purple coloration instead red.
 
-      step_nest_level: an integer which indicates that this step should appear
-        on the build status page with this indentation level.
+      nested: true if this step is nested.
 
       always_run: a bool which indicates that this step should run, even if
         some previous step failed.
 
       outputs_presentation_json: a bool which indicates that this step will emit
         a presentation json file. If this is True, the cmd will be extended with
         a `--presentation-json /path/to/file.json`. This file will be used to
         update the step's presentation on the build status page. The file will
         be expected to contain a single json object, with any of the following
         keys:
@@ skipping 38 matching lines @@
         step['env'] = new_env
       outputs_json = step.pop('outputs_presentation_json', False)
       if outputs_json:
         # This step has requested a JSON file which the binary that
         # it invokes can write to, so provide it with one.
         step['cmd'].extend(['--presentation-json', self.m.json.output(False)])
 
       #TODO(martiniss) change this to use a regular step call
       step['ok_ret'] = set(step.pop('ok_ret', {0}))
       step['infra_step'] = bool(step.pop('infra_step', False))
-      step['step_nest_level'] = int(step.pop('step_nest_level', 0))

[dnj, 2016/08/15 17:33:53]

(This will be re-added in next PS, was oversight).

 
       if step.pop('always_run', False) or not failed_steps:
         try:
           self.m.step.run_from_dict(step)
         except self.m.step.StepFailure:
           failed_steps.append(step['name'])
         finally:
           step_result = self.m.step.active_result
           if outputs_json:
             p = step_result.presentation
             j = step_result.json.output
 
             if j:
               p.logs.update(j.get('logs', {}))
               p.links.update(j.get('links', {}))
               p.step_summary_text = j.get('step_summary_text', '')
               p.step_text = j.get('step_text', '')
               p.properties.update(j.get('properties', {}))
 
     if failed_steps:
       raise self.m.step.StepFailure(
         "the following steps in %s failed: %s" %
         (step_name, failed_steps))