recipes: use python3 for git_footers.py

Bug: 1327534
Recipe-Nontrivial-Roll: chromiumos
Recipe-Nontrivial-Roll: build
Recipe-Nontrivial-Roll: build_limited
Recipe-Nontrivial-Roll: infra
Change-Id: I5c84648eef8930f51d3809692d1cb3ffa46db6f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3775846
Commit-Queue: Gavin Mak <gavinmak@google.com>
Reviewed-by: Gavin Mak <gavinmak@google.com>
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>

recipes/README.recipes.md

@@ -799,7 +799,7 @@ Returns:
 &emsp; **@property**<br>&mdash; **def [presubmit\_support\_path](/recipes/recipe_modules/presubmit/api.py#24)(self):**
 ### *recipe_modules* / [tryserver](/recipes/recipe_modules/tryserver)
 
-[DEPS](/recipes/recipe_modules/tryserver/__init__.py#7): [gerrit](#recipe_modules-gerrit), [git](#recipe_modules-git), [git\_cl](#recipe_modules-git_cl), [recipe\_engine/buildbucket][recipe_engine/recipe_modules/buildbucket], [recipe\_engine/context][recipe_engine/recipe_modules/context], [recipe\_engine/json][recipe_engine/recipe_modules/json], [recipe\_engine/led][recipe_engine/recipe_modules/led], [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]
+[DEPS](/recipes/recipe_modules/tryserver/__init__.py#7): [gerrit](#recipe_modules-gerrit), [git](#recipe_modules-git), [git\_cl](#recipe_modules-git_cl), [recipe\_engine/buildbucket][recipe_engine/recipe_modules/buildbucket], [recipe\_engine/context][recipe_engine/recipe_modules/context], [recipe\_engine/json][recipe_engine/recipe_modules/json], [recipe\_engine/led][recipe_engine/recipe_modules/led], [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/raw\_io][recipe_engine/recipe_modules/raw_io], [recipe\_engine/step][recipe_engine/recipe_modules/step]
 
 PYTHON_VERSION_COMPATIBILITY: PY2+3
 
@@ -880,7 +880,7 @@ Args:
 
 Returned paths will be relative to to api.path['root'].
 
-&mdash; **def [get\_footer](/recipes/recipe_modules/tryserver/api.py#373)(self, tag, patch_text=None):**
+&mdash; **def [get\_footer](/recipes/recipe_modules/tryserver/api.py#375)(self, tag, patch_text=None):**
 
 Gets a specific tag from a CL description
 
@@ -903,11 +903,11 @@ Returns true iff the properties exist to match a Gerrit issue.
 
 Returns true iff we have a change to check out.
 
-&mdash; **def [normalize\_footer\_name](/recipes/recipe_modules/tryserver/api.py#381)(self, footer):**
+&mdash; **def [normalize\_footer\_name](/recipes/recipe_modules/tryserver/api.py#383)(self, footer):**
 
 &mdash; **def [require\_is\_tryserver](/recipes/recipe_modules/tryserver/api.py#220)(self):**
 
-&mdash; **def [set\_change](/recipes/recipe_modules/tryserver/api.py#384)(self, change):**
+&mdash; **def [set\_change](/recipes/recipe_modules/tryserver/api.py#386)(self, change):**
 
 Set the gerrit change for this module.
 

recipes/recipe_modules/tryserver/__init__.py

@@ -15,7 +15,6 @@ DEPS = [
   'recipe_engine/path',
   'recipe_engine/platform',
   'recipe_engine/properties',
-  'recipe_engine/python',
   'recipe_engine/raw_io',
   'recipe_engine/step',
 ]

recipes/recipe_modules/tryserver/api.py

@@ -364,10 +364,12 @@ class TryserverApi(recipe_api.RecipeApi):
         'No patch text or associated changelist, cannot get footers')  #pragma: nocover
 
   def _get_footer_step(self, patch_text):
-    result = self.m.python(
-        'parse description', self.repo_resource('git_footers.py'),
-        args=['--json', self.m.json.output()],
-        stdin=self.m.raw_io.input(data=patch_text))
+    result = self.m.step('parse description', [
+        'python3',
+        self.repo_resource('git_footers.py'), '--json',
+        self.m.json.output()
+    ],
+                         stdin=self.m.raw_io.input(data=patch_text))
     return result.json.output
 
   def get_footer(self, tag, patch_text=None):

recipes/recipe_modules/tryserver/examples/full.expected/basic_tags.json

 [
   {
     "cmd": [
-      "python",
+      "python3",
       "RECIPE_REPO[depot_tools]/git_footers.py",
       "--json",
       "/path/to/tmp/json"
@@ -26,7 +26,7 @@
   },
   {
     "cmd": [
-      "python",
+      "python3",
       "RECIPE_REPO[depot_tools]/git_footers.py",
       "--json",
       "/path/to/tmp/json"

recipes/recipe_modules/tryserver/examples/full.expected/with_gerrit_patch.json

@@ -116,7 +116,7 @@
   },
   {
     "cmd": [
-      "python",
+      "python3",
       "RECIPE_REPO[depot_tools]/git_footers.py",
       "--json",
       "/path/to/tmp/json"
@@ -204,7 +204,7 @@
   },
   {
     "cmd": [
-      "python",
+      "python3",
       "RECIPE_REPO[depot_tools]/git_footers.py",
       "--json",
       "/path/to/tmp/json"

recipes/recipe_modules/tryserver/examples/full.expected/with_gerrit_patch_and_target_ref.json

@@ -116,7 +116,7 @@
   },
   {
     "cmd": [
-      "python",
+      "python3",
       "RECIPE_REPO[depot_tools]/git_footers.py",
       "--json",
       "/path/to/tmp/json"
@@ -204,7 +204,7 @@
   },
   {
     "cmd": [
-      "python",
+      "python3",
       "RECIPE_REPO[depot_tools]/git_footers.py",
       "--json",
       "/path/to/tmp/json"