recipe engine: extract infra-specific paths out of the engine

recipe_modules/path/config.py

Index: recipe_modules/path/config.py
diff --git a/recipe_modules/path/config.py b/recipe_modules/path/config.py
index 0ae25c5688db3b3564da538c14e6f7b4fa22c63d..cead31ae75e432dca7570233044dc9ac467c9c4f 100644
--- a/recipe_modules/path/config.py
+++ b/recipe_modules/path/config.py
@@ -5,7 +5,7 @@
 from recipe_engine.config import config_item_context, ConfigGroup, Dict, Static
 from recipe_engine.config_types import Path
 
-def BaseConfig(PLATFORM, CURRENT_WORKING_DIR, TEMP_DIR, **_kwargs):
+def BaseConfig(CURRENT_WORKING_DIR, TEMP_DIR, **_kwargs):
   assert CURRENT_WORKING_DIR[0].endswith(('\\', '/'))
   assert TEMP_DIR[0].endswith(('\\', '/'))
   return ConfigGroup(
@@ -15,61 +15,16 @@ def BaseConfig(PLATFORM, CURRENT_WORKING_DIR, TEMP_DIR, **_kwargs):
     # dynamic path name -> Path object (referencing one of the base_paths)
     dynamic_paths = Dict(value_type=(Path, type(None))),
 
-    PLATFORM = Static(PLATFORM),
     CURRENT_WORKING_DIR = Static(tuple(CURRENT_WORKING_DIR)),
     TEMP_DIR = Static(tuple(TEMP_DIR)),
   )
 
-def test_name(args):  # pragma: no cover
-  if args['CURRENT_WORKING_DIR'][0] == '/':
-    return 'posix'
-  else:
-    return 'windows'
-
 config_ctx = config_item_context(BaseConfig)
 
 @config_ctx(is_root=True)
 def BASE(c):
   c.base_paths['cwd'] = c.CURRENT_WORKING_DIR
-  c.base_paths['tmp_base'] = c.TEMP_DIR
-
-@config_ctx()
-def buildbot(c):
-  c.base_paths['root'] = c.CURRENT_WORKING_DIR[:-4]
-  c.base_paths['slave_build'] = c.CURRENT_WORKING_DIR
-  c.base_paths['cache'] = c.base_paths['root'] + (
-      'build', 'slave', 'cache')
-  c.base_paths['git_cache'] = c.base_paths['root'] + (
-      'build', 'slave', 'cache_dir')
-  c.base_paths['goma_cache'] = c.base_paths['root'] + (
-      'build', 'slave', 'goma_cache')
-  for token in ('build_internal', 'build', 'depot_tools'):
-    c.base_paths[token] = c.base_paths['root'] + (token,)
-  c.dynamic_paths['checkout'] = None
-
-@config_ctx(includes=['buildbot'])
-def swarming(c):
-  c.base_paths['slave_build'] = (
-      c.CURRENT_WORKING_DIR[:1] +
-      ('b', 'fake_build', 'slave', 'fake_slave', 'build'))
+  c.base_paths['tmp'] = c.TEMP_DIR
+  c.base_paths['root'] = c.CURRENT_WORKING_DIR[:1]
 
-@config_ctx()
-def kitchen(c):
-  c.base_paths['root'] = c.CURRENT_WORKING_DIR
-  c.base_paths['slave_build'] = c.CURRENT_WORKING_DIR
-  # TODO(phajdan.jr): have one cache dir, let clients append suffixes.
-  # TODO(phajdan.jr): set persistent cache path for remaining platforms.
-  # NOTE: do not use /b/swarm_slave here - it gets deleted on bot redeploy,
-  # and may happen even after a reboot.
-  if c.PLATFORM == 'linux':
-    c.base_paths['cache'] = (
-        '/', 'b', 'cache', 'chromium')
-    c.base_paths['git_cache'] = (
-        '/', 'b', 'cache', 'chromium', 'git_cache')
-    c.base_paths['goma_cache'] = (
-        '/', 'b', 'cache', 'chromium', 'goma_cache')
-  else:
-    c.base_paths['cache'] = c.base_paths['root'] + ('cache',)
-    c.base_paths['git_cache'] = c.base_paths['root'] + ('cache_dir',)
-    c.base_paths['goma_cache'] = c.base_paths['root'] + ('goma_cache',)
   c.dynamic_paths['checkout'] = None