[recipe_modules/depot_tools] Add on_path helper.

This will be used by various things in build and build_internal which
"need" a depot_tools on PATH (though I suspect most of those should be
refactored to use the depot_tools in chromium/src.git).

R=tandrii@chromium.org

Bug: 789808
Change-Id: I5d0590ccdc5482bd8e3048ad46a39b5aedacbddb
Reviewed-on: https://chromium-review.googlesource.com/828465Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>

recipes/README.recipes.md

@@ -5,7 +5,7 @@
 **[Recipe Modules](#Recipe-Modules)**
   * [bot_update](#recipe_modules-bot_update) — Recipe module to ensure a checkout is consistent on a bot.
   * [cipd](#recipe_modules-cipd)
-  * [depot_tools](#recipe_modules-depot_tools)
+  * [depot_tools](#recipe_modules-depot_tools) — The `depot_tools` module provides safe functions to access paths within the depot_tools repo.
   * [gclient](#recipe_modules-gclient)
   * [gerrit](#recipe_modules-gerrit)
   * [git](#recipe_modules-git)
@@ -48,14 +48,14 @@ Recipe module to ensure a checkout is consistent on a bot.
 
 Wrapper for easy calling of bot_update.
 
-— **def [apply\_gerrit\_ref](/recipes/recipe_modules/bot_update/api.py#54)(self, root, gerrit_no_reset=False, gerrit_no_rebase_patch_ref=False, gerrit_repo=None, gerrit_ref=None, step_name='apply_gerrit', \*\*kwargs):**
+— **def [apply\_gerrit\_ref](/recipes/recipe_modules/bot_update/api.py#46)(self, root, gerrit_no_reset=False, gerrit_no_rebase_patch_ref=False, gerrit_repo=None, gerrit_ref=None, step_name='apply_gerrit', \*\*kwargs):**
 
-— **def [deapply\_patch](/recipes/recipe_modules/bot_update/api.py#450)(self, bot_update_step):**
+— **def [deapply\_patch](/recipes/recipe_modules/bot_update/api.py#442)(self, bot_update_step):**
 
 Deapplies a patch, taking care of DEPS and solution revisions properly.
     
 
-— **def [ensure\_checkout](/recipes/recipe_modules/bot_update/api.py#76)(self, gclient_config=None, suffix=None, patch=True, update_presentation=True, patch_root=None, no_shallow=False, with_branch_heads=False, with_tags=False, refs=None, patch_oauth2=False, oauth2_json=False, use_site_config_creds=True, clobber=False, root_solution_revision=None, rietveld=None, issue=None, patchset=None, gerrit_no_reset=False, gerrit_no_rebase_patch_ref=False, disable_syntax_validation=False, manifest_name=None, \*\*kwargs):**
+— **def [ensure\_checkout](/recipes/recipe_modules/bot_update/api.py#68)(self, gclient_config=None, suffix=None, patch=True, update_presentation=True, patch_root=None, no_shallow=False, with_branch_heads=False, with_tags=False, refs=None, patch_oauth2=False, oauth2_json=False, use_site_config_creds=True, clobber=False, root_solution_revision=None, rietveld=None, issue=None, patchset=None, gerrit_no_reset=False, gerrit_no_rebase_patch_ref=False, disable_syntax_validation=False, manifest_name=None, \*\*kwargs):**
 
 Args:
   use_site_config_creds: If the oauth2 credentials are in the buildbot
@@ -74,7 +74,7 @@ Args:
   manifest_name: The name of the manifest to upload to LogDog.  This must
     be unique for the whole build.
 
-— **def [get\_project\_revision\_properties](/recipes/recipe_modules/bot_update/api.py#427)(self, project_name, gclient_config=None):**
+— **def [get\_project\_revision\_properties](/recipes/recipe_modules/bot_update/api.py#419)(self, project_name, gclient_config=None):**
 
 Returns all property names used for storing the checked-out revision of
 a given project.
@@ -88,7 +88,7 @@ Args:
 Returns (list of str): All properties that'll hold the checked-out revision
     of the given project. An empty list if no such properties exist.
 
-&emsp; **@property**<br>&mdash; **def [last\_returned\_properties](/recipes/recipe_modules/bot_update/api.py#48)(self):**
+&emsp; **@property**<br>&mdash; **def [last\_returned\_properties](/recipes/recipe_modules/bot_update/api.py#40)(self):**
 ### *recipe_modules* / [cipd](/recipes/recipe_modules/cipd)
 
 [DEPS](/recipes/recipe_modules/cipd/__init__.py#1): [infra\_paths](#recipe_modules-infra_paths), [recipe\_engine/json][recipe_engine/recipe_modules/json], [recipe\_engine/path][recipe_engine/recipe_modules/path], [recipe\_engine/platform][recipe_engine/recipe_modules/platform], [recipe\_engine/properties][recipe_engine/recipe_modules/properties], [recipe\_engine/python][recipe_engine/recipe_modules/python], [recipe\_engine/raw\_io][recipe_engine/recipe_modules/raw_io], [recipe\_engine/step][recipe_engine/recipe_modules/step]
@@ -193,27 +193,39 @@ parameters will be used.
 &mdash; **def [set\_tag](/recipes/recipe_modules/cipd/api.py#366)(self, package_name, version, tags):**
 ### *recipe_modules* / [depot\_tools](/recipes/recipe_modules/depot_tools)
 
-[DEPS](/recipes/recipe_modules/depot_tools/__init__.py#1): [recipe\_engine/platform][recipe_engine/recipe_modules/platform]
+[DEPS](/recipes/recipe_modules/depot_tools/__init__.py#5): [recipe\_engine/context][recipe_engine/recipe_modules/context], [recipe\_engine/platform][recipe_engine/recipe_modules/platform], [recipe\_engine/runtime][recipe_engine/recipe_modules/runtime]
 
-#### **class [DepotToolsApi](/recipes/recipe_modules/depot_tools/api.py#7)([RecipeApi][recipe_engine/wkt/RecipeApi]):**
+The `depot_tools` module provides safe functions to access paths within
+the depot_tools repo.
 
-&emsp; **@property**<br>&mdash; **def [cros\_path](/recipes/recipe_modules/depot_tools/api.py#21)(self):**
+#### **class [DepotToolsApi](/recipes/recipe_modules/depot_tools/api.py#12)([RecipeApi][recipe_engine/wkt/RecipeApi]):**
 
-&emsp; **@property**<br>&mdash; **def [download\_from\_google\_storage\_path](/recipes/recipe_modules/depot_tools/api.py#8)(self):**
+&emsp; **@property**<br>&mdash; **def [cros\_path](/recipes/recipe_modules/depot_tools/api.py#26)(self):**
 
-&emsp; **@property**<br>&mdash; **def [gn\_py\_path](/recipes/recipe_modules/depot_tools/api.py#25)(self):**
+&emsp; **@property**<br>&mdash; **def [download\_from\_google\_storage\_path](/recipes/recipe_modules/depot_tools/api.py#13)(self):**
 
-&emsp; **@property**<br>&mdash; **def [gsutil\_py\_path](/recipes/recipe_modules/depot_tools/api.py#31)(self):**
+&emsp; **@property**<br>&mdash; **def [gn\_py\_path](/recipes/recipe_modules/depot_tools/api.py#30)(self):**
 
-&emsp; **@property**<br>&mdash; **def [ninja\_path](/recipes/recipe_modules/depot_tools/api.py#35)(self):**
+&emsp; **@property**<br>&mdash; **def [gsutil\_py\_path](/recipes/recipe_modules/depot_tools/api.py#36)(self):**
 
-&emsp; **@property**<br>&mdash; **def [presubmit\_support\_py\_path](/recipes/recipe_modules/depot_tools/api.py#40)(self):**
+&emsp; **@property**<br>&mdash; **def [ninja\_path](/recipes/recipe_modules/depot_tools/api.py#40)(self):**
 
-&emsp; **@property**<br>&mdash; **def [root](/recipes/recipe_modules/depot_tools/api.py#16)(self):**
+&emsp; **@contextlib.contextmanager**<br>&mdash; **def [on\_path](/recipes/recipe_modules/depot_tools/api.py#49)(self):**
+
+Use this context manager to put depot_tools on $PATH.
+
+Example:
+
+  with api.depot_tools.on_path():
+    # run some steps
+
+&emsp; **@property**<br>&mdash; **def [presubmit\_support\_py\_path](/recipes/recipe_modules/depot_tools/api.py#45)(self):**
+
+&emsp; **@property**<br>&mdash; **def [root](/recipes/recipe_modules/depot_tools/api.py#21)(self):**
 
 Returns (Path): The "depot_tools" root directory.
 
-&emsp; **@property**<br>&mdash; **def [upload\_to\_google\_storage\_path](/recipes/recipe_modules/depot_tools/api.py#12)(self):**
+&emsp; **@property**<br>&mdash; **def [upload\_to\_google\_storage\_path](/recipes/recipe_modules/depot_tools/api.py#17)(self):**
 ### *recipe_modules* / [gclient](/recipes/recipe_modules/gclient)
 
 [DEPS](/recipes/recipe_modules/gclient/__init__.py#1): [infra\_paths](#recipe_modules-infra_paths), [tryserver](#recipe_modules-tryserver), [recipe\_engine/context][recipe_engine/recipe_modules/context], [recipe\_engine/json][recipe_engine/recipe_modules/json], [recipe\_engine/path][recipe_engine/recipe_modules/path], [recipe\_engine/platform][recipe_engine/recipe_modules/platform], [recipe\_engine/properties][recipe_engine/recipe_modules/properties], [recipe\_engine/python][recipe_engine/recipe_modules/python], [recipe\_engine/step][recipe_engine/recipe_modules/step]
@@ -767,9 +779,9 @@ like checkout or compile), and some of these tests have failed.
 &mdash; **def [RunSteps](/recipes/recipe_modules/cipd/examples/platform_suffix.py#22)(api, arch_override, bits_override, expect_error):**
 ### *recipes* / [depot\_tools:examples/full](/recipes/recipe_modules/depot_tools/examples/full.py)
 
-[DEPS](/recipes/recipe_modules/depot_tools/examples/full.py#5): [depot\_tools](#recipe_modules-depot_tools), [recipe\_engine/path][recipe_engine/recipe_modules/path], [recipe\_engine/platform][recipe_engine/recipe_modules/platform], [recipe\_engine/step][recipe_engine/recipe_modules/step]
+[DEPS](/recipes/recipe_modules/depot_tools/examples/full.py#5): [depot\_tools](#recipe_modules-depot_tools), [recipe\_engine/path][recipe_engine/recipe_modules/path], [recipe\_engine/platform][recipe_engine/recipe_modules/platform], [recipe\_engine/runtime][recipe_engine/recipe_modules/runtime], [recipe\_engine/step][recipe_engine/recipe_modules/step]
 
-&mdash; **def [RunSteps](/recipes/recipe_modules/depot_tools/examples/full.py#13)(api):**
+&mdash; **def [RunSteps](/recipes/recipe_modules/depot_tools/examples/full.py#14)(api):**
 ### *recipes* / [fetch\_end\_to\_end\_test](/recipes/recipes/fetch_end_to_end_test.py)
 
 [DEPS](/recipes/recipes/fetch_end_to_end_test.py#5): [bot\_update](#recipe_modules-bot_update), [gclient](#recipe_modules-gclient), [recipe\_engine/context][recipe_engine/recipe_modules/context], [recipe\_engine/file][recipe_engine/recipe_modules/file], [recipe\_engine/path][recipe_engine/recipe_modules/path], [recipe\_engine/python][recipe_engine/recipe_modules/python], [recipe\_engine/step][recipe_engine/recipe_modules/step]

recipes/recipe_modules/bot_update/api.py

@@ -34,15 +34,7 @@ class BotUpdateApi(recipe_api.RecipeApi):
     bot_update_path = self.resource('bot_update.py')
     kwargs.setdefault('infra_step', True)
 
-    # On buildbot we have to put this on the FRONT of path, to combat the
-    # 'automatic' depot_tools. However, on LUCI, there is no automatic
-    # depot_tools, so it's safer to put it at the END of path, where it won't
-    # accidentally override e.g. python, vpython, etc.
-    key = 'env_prefixes'
-    if self.m.runtime.is_luci:
-      key = 'env_suffixes'
-
-    with self.m.context(**{key: {'PATH': [self.m.depot_tools.root]}}):
+    with self.m.depot_tools.on_path():
       return self.m.python(name, bot_update_path, cmd, **kwargs)
 
   @property

recipes/recipe_modules/depot_tools/__init__.py

+# Copyright 2017 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 = [
+  'recipe_engine/context',
   'recipe_engine/platform',
+  'recipe_engine/runtime',
 ]

recipes/recipe_modules/depot_tools/api.py

@@ -2,6 +2,11 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+"""The `depot_tools` module provides safe functions to access paths within
+the depot_tools repo."""
+
+import contextlib
+
 from recipe_engine import recipe_api
 
 class DepotToolsApi(recipe_api.RecipeApi):
@@ -40,3 +45,23 @@ class DepotToolsApi(recipe_api.RecipeApi):
   @property
   def presubmit_support_py_path(self):
     return self.package_repo_resource('presubmit_support.py')
+
+  @contextlib.contextmanager
+  def on_path(self):
+    """Use this context manager to put depot_tools on $PATH.
+
+    Example:
+
+      with api.depot_tools.on_path():
+        # run some steps
+    """
+    # On buildbot we have to put this on the FRONT of path, to combat the
+    # 'automatic' depot_tools. However, on LUCI, there is no automatic
+    # depot_tools, so it's safer to put it at the END of path, where it won't
+    # accidentally override e.g. python, vpython, etc.
+    key = 'env_prefixes'
+    if self.m.runtime.is_luci:
+      key = 'env_suffixes'
+
+    with self.m.context(**{key: {'PATH': [self.root]}}):
+      yield

recipes/recipe_modules/depot_tools/examples/full.expected/basic.json

@@ -55,6 +55,18 @@
     ],
     "name": "presubmit_support_py_path"
   },
+  {
+    "cmd": [
+      "echo",
+      "$PATH"
+    ],
+    "env_prefixes": {
+      "PATH": [
+        "RECIPE_PACKAGE_REPO[depot_tools]"
+      ]
+    },
+    "name": "on_path"
+  },
   {
     "name": "$result",
     "recipe_result": null,

recipes/recipe_modules/depot_tools/examples/full.expected/basic_luci.json

+[
+  {
+    "cmd": [
+      "ls",
+      "RECIPE_PACKAGE_REPO[depot_tools]"
+    ],
+    "name": "root"
+  },
+  {
+    "cmd": [
+      "ls",
+      "RECIPE_PACKAGE_REPO[depot_tools]/download_from_google_storage.py"
+    ],
+    "name": "download_from_google_storage"
+  },
+  {
+    "cmd": [
+      "ls",
+      "RECIPE_PACKAGE_REPO[depot_tools]/upload_to_google_storage.py"
+    ],
+    "name": "upload_to_google_storage"
+  },
+  {
+    "cmd": [
+      "ls",
+      "RECIPE_PACKAGE_REPO[depot_tools]/cros"
+    ],
+    "name": "cros"
+  },
+  {
+    "cmd": [
+      "ls",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gn.py"
+    ],
+    "name": "gn_py_path"
+  },
+  {
+    "cmd": [
+      "ls",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py"
+    ],
+    "name": "gsutil_py_path"
+  },
+  {
+    "cmd": [
+      "ls",
+      "RECIPE_PACKAGE_REPO[depot_tools]/ninja"
+    ],
+    "name": "ninja_path"
+  },
+  {
+    "cmd": [
+      "ls",
+      "RECIPE_PACKAGE_REPO[depot_tools]/presubmit_support.py"
+    ],
+    "name": "presubmit_support_py_path"
+  },
+  {
+    "cmd": [
+      "echo",
+      "$PATH"
+    ],
+    "env_suffixes": {
+      "PATH": [
+        "RECIPE_PACKAGE_REPO[depot_tools]"
+      ]
+    },
+    "name": "on_path"
+  },
+  {
+    "name": "$result",
+    "recipe_result": null,
+    "status_code": 0
+  }
+]
\ No newline at end of file

recipes/recipe_modules/depot_tools/examples/full.expected/win.json

@@ -55,6 +55,18 @@
     ],
     "name": "presubmit_support_py_path"
   },
+  {
+    "cmd": [
+      "echo",
+      "$PATH"
+    ],
+    "env_prefixes": {
+      "PATH": [
+        "RECIPE_PACKAGE_REPO[depot_tools]"
+      ]
+    },
+    "name": "on_path"
+  },
   {
     "name": "$result",
     "recipe_result": null,

recipes/recipe_modules/depot_tools/examples/full.py

@@ -4,9 +4,10 @@
 
 DEPS = [
   'depot_tools',
-  'recipe_engine/step',
   'recipe_engine/path',
   'recipe_engine/platform',
+  'recipe_engine/runtime',
+  'recipe_engine/step',
 ]
 
 
@@ -36,8 +37,16 @@ def RunSteps(api):
       'presubmit_support_py_path',
       ['ls', api.depot_tools.presubmit_support_py_path])
 
+  with api.depot_tools.on_path():
+    api.step('on_path', ['echo', '$PATH'])
+
 
 def GenTests(api):
   yield api.test('basic')
 
+  yield (
+    api.test('basic_luci')
+    + api.runtime(is_experimental=False, is_luci=True)
+  )
+
   yield api.test('win') + api.platform('win', 32)