depot_tools: add infra_paths recipe module for infra-specific paths (attempt #2)

recipe_modules/infra_paths/path_config.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.
+
+import DEPS
+CONFIG_CTX = DEPS['path'].CONFIG_CTX
+
+
+@CONFIG_CTX()
+def infra_common(c):
+  c.dynamic_paths['checkout'] = None
+
+
+@CONFIG_CTX(includes=['infra_common'])
+def infra_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,)
+
+
+@CONFIG_CTX(includes=['infra_common'])
+def infra_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',)