add recipe continuous builders for each repo with recipes

scripts/slave/recipes/infra/recipe_simulation.py

 # Copyright 2016 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.
-"""A continious builder for build repo which simulates recipes."""
+"""A continuous builder which runs recipe tests."""
+
+from recipe_engine.recipe_api import Property
 
 DEPS = [
   'depot_tools/bot_update',
   'depot_tools/gclient',
   'recipe_engine/path',
   'recipe_engine/properties',
   'recipe_engine/python',
+  'recipe_engine/step',
+  'luci_config',
 ]
 
+PROPERTIES = {
+  'project_under_test': Property(
+      default='build', kind=str, help='luci-config project to run tests for')
+}
 
-def RunSteps(api):
-  api.gclient.set_config('build')
-  api.bot_update.ensure_checkout(force=True)
-  recipes_py = api.path['checkout'].join('scripts', 'slave', 'recipes.py')
-  api.python('recipe fetch deps', recipes_py, ['fetch'])
-  # In theory, this should work too. But in practice, this fails to import
-  # coverage module (http://crbug.com/577049).
-  # api.python('recipe simulation test', recipes_py, ['simulation_test'])
-  recipe_simulation_test = api.path['checkout'].join(
-      'scripts', 'slave', 'unittests', 'recipe_simulation_test.py')
-  api.python('recipe simulation test', recipe_simulation_test, ['test'])
 
+def RunSteps(api, project_under_test):
+  root_dir = api.path['slave_build']
+  cache_dir = root_dir.join('_cache_dir')
+
+  c = api.gclient.make_config(CACHE_DIR=cache_dir)
+  soln = c.solutions.add()
+  soln.name = project_under_test
+  soln.url = api.luci_config.get_project_metadata(
+      project_under_test)['repo_url']
+
+  api.bot_update.ensure_checkout(
+      force=True, gclient_config=c,
+      cwd=root_dir)
+
+  # TODO(martiniss): allow recipes.cfg patches to take affect
+  # This requires getting the refs.cfg from luci_config, reading the local
+  # patched version, etc.
+  result = api.luci_config.get_project_config(project_under_test, 'recipes.cfg')
+  recipes_cfg = api.luci_config.parse_textproto(result['content'].split('\n'))
+  path = recipes_cfg['recipes_path'][0].split('/')
+
+  api.step(
+      'recipe simulation test', [
+          root_dir.join(*([project_under_test] + path + ['recipes.py'])),
+          '--use-bootstrap', 'simulation_test'
+      ])
 
 def GenTests(api):
   yield (
       api.test('normal') +
       api.properties.generic(
           mastername='chromium.tools.build',
           buildername='recipe simulation tester',
           revision='deadbeaf',
-      )
+          project_under_test='build',
+      ) +
+      api.luci_config.get_projects(('build',)) +
+      api.luci_config.get_project_config(
+          'build', 'recipes.cfg',
+          'recipes_path: "foobar"')
   )