Push roll candidates based on candidate ref instead of lkgr.

tools/push-to-trunk/auto_push.py

Index: tools/push-to-trunk/auto_push.py
diff --git a/tools/push-to-trunk/auto_push.py b/tools/push-to-trunk/auto_push.py
index 31d39612bbbd935c8c7e85e1ded43b0b44cbd8c6..68fba55d59bae0b06cb5f7afc3f815f698a66bbc 100755
--- a/tools/push-to-trunk/auto_push.py
+++ b/tools/push-to-trunk/auto_push.py
@@ -70,13 +70,12 @@ class CheckTreeStatus(Step):
                % self["tree_message"])
 
 
-class FetchLKGR(Step):
-  MESSAGE = "Fetching V8 LKGR."
+class FetchCandidate(Step):
+  MESSAGE = "Fetching V8 roll candidate ref."
 
   def RunStep(self):
-    lkgr_url = "https://v8-status.appspot.com/lkgr"
-    # Retry several times since app engine might have issues.
-    self["lkgr"] = self.ReadURL(lkgr_url, wait_plan=[5, 20, 300, 300])
+    self.Git("fetch origin +refs/heads/candidate:refs/heads/candidate")
+    self["candidate"] = self.Git("show-ref -s refs/heads/candidate")
 
 
 class CheckLastPush(Step):
@@ -94,8 +93,8 @@ class CheckLastPush(Step):
       self.Die("Could not retrieve bleeding edge revision for trunk push %s"
                % last_push)
 
-    if self["lkgr"] == last_push_be:
-      print "Already pushed current lkgr %s" % last_push_be
+    if self["candidate"] == last_push_be:
+      print "Already pushed current candidate %s" % last_push_be
       return True
 
 
@@ -103,12 +102,12 @@ class PushToCandidates(Step):
   MESSAGE = "Pushing to candidates if specified."
 
   def RunStep(self):
-    print "Pushing lkgr %s to candidates." % self["lkgr"]
+    print "Pushing candidate %s to candidates." % self["candidate"]
 
     args = [
       "--author", self._options.author,
       "--reviewer", self._options.reviewer,
-      "--revision", self["lkgr"],
+      "--revision", self["candidate"],
       "--force",
     ]
 
@@ -144,7 +143,7 @@ class AutoPush(ScriptsBase):
       Preparation,
       CheckAutoPushSettings,
       CheckTreeStatus,
-      FetchLKGR,
+      FetchCandidate,
       CheckLastPush,
       PushToCandidates,
     ]