Revert of Cross-repo recipe package system.

scripts/slave/recipe_modules/step/example.py

Index: scripts/slave/recipe_modules/step/example.py
diff --git a/scripts/slave/recipe_modules/step/example.py b/scripts/slave/recipe_modules/step/example.py
new file mode 100644
index 0000000000000000000000000000000000000000..ed1c6389d7ef563e7605fd2bbff8e576bddc2658
--- /dev/null
+++ b/scripts/slave/recipe_modules/step/example.py
@@ -0,0 +1,115 @@
+# Copyright 2013 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.
+
+DEPS = [
+  'properties',
+  'step',
+]
+
+from recipe_engine import recipe_api
+
+def RunSteps(api):
+  # TODO(martinis) change this
+  # The api.step object is directly callable.
+  api.step('hello', ['echo', 'Hello World'])
+  api.step('hello', ['echo', 'Why hello, there.'])
+
+  # You can also manipulate various aspects of the step, such as env.
+  # These are passed straight through to subprocess.Popen.
+  # Also, abusing bash -c in this way is a TERRIBLE IDEA DON'T DO IT.
+  api.step('goodbye', ['bash', '-c', 'echo Good bye, $friend.'],
+           env={'friend': 'Darth Vader'})
+
+  # Finally, you can make your step accept any return code
+  api.step('anything is cool', ['bash', '-c', 'exit 3'],
+           ok_ret='any')
+
+  # We can manipulate the step presentation arbitrarily until we run
+  # the next step.
+  step_result = api.step('hello', ['echo', 'hello'])
+  step_result.presentation.status = api.step.EXCEPTION
+  step_result.presentation.logs['the reason'] = ['The reason\nit failed']
+
+  # Without a command, a step can be used to present some data from the recipe.
+  step_result = api.step('Just print stuff', cmd=None)
+  step_result.presentation.logs['more'] = ['More stuff']
+
+  try:
+    api.step('goodbye', ['echo', 'goodbye'])
+    # Modifying step_result now would raise an AssertionError.
+  except api.step.StepFailure:
+    # Raising anything besides StepFailure causes the build to go purple.
+    raise ValueError('goodbye must exit 0!')
+
+  # Aggregate failures from tests!
+  try:
+    with recipe_api.defer_results():
+      api.step('testa', ['echo', 'testa'])
+      api.step('testb', ['echo', 'testb'])
+  except recipe_api.AggregatedStepFailure as f:
+    raise api.step.StepFailure("You can catch step failures.")
+
+  # Some steps are needed from an infrastructure point of view. If these
+  # steps fail, the build stops, but doesn't get turned red because it's
+  # not the developers' fault.
+  try:
+    api.step('cleanup', ['echo', 'cleaning', 'up', 'build'], infra_step=True)
+  except api.step.InfraFailure as f:
+    assert f.result.presentation.status == api.step.EXCEPTION
+
+  # Run a step through a made-up wrapper program.
+  api.step('application', ['echo', 'main', 'application'],
+           wrapper=['python', 'test-wrapper.py', '-v', '--'])
+
+  if api.properties.get('access_invalid_data'):
+    result = api.step('no-op', ['echo', 'I', 'do', 'nothing'])
+    # Trying to access non-existent attributes on the result should raise.
+    _ = result.json.output
+
+  # You can also raise a warning, which will act like a step failure, but
+  # will turn the build yellow, and stop the build.
+  raise api.step.StepWarning("Warning, robots approaching!")
+
+
+def GenTests(api):
+  yield (
+      api.test('basic') +
+      api.step_data('anything is cool', retcode=3)
+    )
+
+  # If you don't have the expect_exception in this test, you will get something
+  # like this output.
+  # ======================================================================
+  # ERROR: step:example.exceptional (..../exceptional.json)
+  # ----------------------------------------------------------------------
+  # Traceback (most recent call last):
+  #   <full stack trace ommitted>
+  #   File "annotated_run.py", line 537, in run
+  #     retcode = steps_function(api)
+  #   File "recipe_modules/step/example.py", line 39, in RunSteps
+  #     raise ValueError('goodbye must exit 0!')
+  # ValueError: goodbye must exit 0!
+
+  yield (
+      api.test('exceptional') +
+      api.step_data('goodbye (2)', retcode=1) +
+      api.expect_exception('ValueError')
+    )
+
+  yield (
+      api.test('defer_results') +
+      api.step_data('testa', retcode=1)
+    )
+
+  yield (
+      api.test('invalid_access') +
+      api.properties(access_invalid_data=True) +
+      api.expect_exception('StepDataAttributeError')
+    )
+
+  yield (
+      api.test('infra_failure') +
+      api.properties(raise_infra_failure=True) +
+      api.step_data('cleanup', retcode=1)
+    )