Revert of Cross-repo recipe package system.

scripts/slave/recipe_modules/step/config.py

Index: scripts/slave/recipe_modules/step/config.py
diff --git a/scripts/slave/recipe_modules/step/config.py b/scripts/slave/recipe_modules/step/config.py
new file mode 100644
index 0000000000000000000000000000000000000000..0c3f249e5a4ecfb3671ad0ab104dae7172796fc3
--- /dev/null
+++ b/scripts/slave/recipe_modules/step/config.py
@@ -0,0 +1,58 @@
+# 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.
+
+import collections
+
+from recipe_engine.config import List
+from recipe_engine.config import (config_item_context, ConfigGroup, ConfigList,
+                          Dict, Single, Set)
+from recipe_engine.config_types import Path
+from recipe_engine.util import Placeholder
+
+
+def BaseConfig(**_kwargs):
+  def render_cmd(lst):
+    return [(x if isinstance(x, Placeholder) else str(x)) for x in lst]
+
+  return ConfigGroup(
+    # For compatibility with buildbot, the step name must be ascii, which is why
+    # this is a 'str' and not a 'basestring'.
+    name = Single(str),
+    cmd = List(inner_type=(int,basestring,Path,Placeholder),
+               jsonish_fn=render_cmd),
+
+    # optional
+    env = Dict(item_fn=lambda (k, v): (k, v if v is None else str(v)),
+               value_type=(basestring,int,Path,type(None))),
+    cwd = Single(Path, jsonish_fn=str, required=False),
+
+    stdout = Single(Placeholder, required=False),
+    stderr = Single(Placeholder, required=False),
+    stdin = Single(Placeholder, required=False),
+
+    allow_subannotations = Single(bool, required=False),
+
+    trigger_specs = ConfigList(
+        lambda: ConfigGroup(
+            bucket=Single(basestring),
+            builder_name=Single(basestring),
+            properties=Dict(value_type=object),
+            buildbot_changes=List(dict),
+        ),
+    ),
+
+    step_test_data = Single(collections.Callable, required=False),
+
+    ok_ret = Set(int),
+    infra_step = Single(bool, required=False),
+    step_nest_level = Single(int, required=False),
+  )
+
+
+config_ctx = config_item_context(BaseConfig)
+
+@config_ctx()
+def test(c):  # pragma: no cover
+  c.name = 'test'
+  c.cmd = [Path('[CHECKOUT]', 'build', 'tools', 'cool_script.py')]