Let auto-roll push the lkgr.

tools/push-to-trunk/auto_roll.py

Index: tools/push-to-trunk/auto_roll.py
diff --git a/tools/push-to-trunk/auto_roll.py b/tools/push-to-trunk/auto_roll.py
index ebe2397525d99ee05f1a90645ff216d0598fdfd6..014016c9c71dbb2d4a30a7d6eb9f89e2b16f1f15 100755
--- a/tools/push-to-trunk/auto_roll.py
+++ b/tools/push-to-trunk/auto_roll.py
@@ -44,6 +44,8 @@ CONFIG = {
   SETTINGS_LOCATION: "~/.auto-roll",
 }
 
+PUSH_MESSAGE_RE = re.compile(r".* \(based on bleeding_edge revision r(\d+)\)$")
+
 
 class Preparation(Step):
   MESSAGE = "Preparation."
@@ -77,42 +79,40 @@ class CheckTreeStatus(Step):
                % self["tree_message"])
 
 
-class FetchLatestRevision(Step):
-  MESSAGE = "Fetching latest V8 revision."
+class FetchLKGR(Step):
+  MESSAGE = "Fetching V8 LKGR."
 
   def RunStep(self):
-    match = re.match(r"^r(\d+) ", self.GitSVNLog())
-    if not match:  # pragma: no cover
-      self.Die("Could not extract current svn revision from log.")
-    self["latest"] = match.group(1)
+    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])
 
 
 class CheckLastPush(Step):
   MESSAGE = "Checking last V8 push to trunk."
 
   def RunStep(self):
-    last_push_hash = self.FindLastTrunkPush()
-    last_push = int(self.GitSVNFindSVNRev(last_push_hash))
+    last_push = self.FindLastTrunkPush()
+
+    # Retrieve the bleeding edge revision of the last push from the text in
+    # the push commit message.
+    last_push_title = self.GitLog(n=1, format="%s", git_hash=last_push)
+    last_push_be = PUSH_MESSAGE_RE.match(last_push_title).group(1)
+
+    if not last_push_be:  # pragma: no cover
+      self.Die("Could not retrieve bleeding edge revision for trunk push %s"
+               % last_push)
 
     # TODO(machenbach): This metric counts all revisions. It could be
     # improved by counting only the revisions on bleeding_edge.
-    if int(self["latest"]) - last_push < 10:  # pragma: no cover
+    if int(self["lkgr"]) - int(last_push_be) < 10:  # pragma: no cover
       # This makes sure the script doesn't push twice in a row when the cron
       # job retries several times.
-      self.Die("Last push too recently: %d" % last_push)
-
-
-class FetchLKGR(Step):
-  MESSAGE = "Fetching V8 LKGR."
-
-  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.Die("Last push too recently: %s" % last_push_be)
 
 
 class PushToTrunk(Step):
-  MESSAGE = "Pushing to trunk if possible."
+  MESSAGE = "Pushing to trunk if specified."
 
   def PushTreeStatus(self, message):
     if not self._options.status_password:
@@ -129,26 +129,21 @@ class PushToTrunk(Step):
                  wait_plan=[5, 20])
 
   def RunStep(self):
-    latest = int(self["latest"])
-    lkgr = int(self["lkgr"])
-    if latest == lkgr:
-      print "ToT (r%d) is clean. Pushing to trunk." % latest
-      self.PushTreeStatus("Tree is closed (preparing to push)")
-
-      # TODO(machenbach): Update the script before calling it.
-      try:
-        if self._options.push:
-          P = push_to_trunk.PushToTrunk
-          self._side_effect_handler.Call(
-              P(push_to_trunk.CONFIG, self._side_effect_handler).Run,
-              ["-a", self._options.author,
-               "-r", self._options.reviewer,
-               "-f"])
-      finally:
-        self.PushTreeStatus(self["tree_message"])
-    else:
-      print("ToT (r%d) is ahead of the LKGR (r%d). Skipping push to trunk."
-            % (latest, lkgr))
+    print "Pushing lkgr %s to trunk." % self["lkgr"]
+    self.PushTreeStatus("Tree is closed (preparing to push)")
+
+    # TODO(machenbach): Update the script before calling it.
+    try:
+      if self._options.push:
+        P = push_to_trunk.PushToTrunk
+        self._side_effect_handler.Call(
+            P(push_to_trunk.CONFIG, self._side_effect_handler).Run,
+            ["-author", self._options.author,
+             "-reviewer", self._options.reviewer,
+             "-revision", self["lkgr"],
+             "-force"])
+    finally:
+      self.PushTreeStatus(self["tree_message"])
 
 
 class AutoRoll(ScriptsBase):
@@ -173,9 +168,8 @@ class AutoRoll(ScriptsBase):
       Preparation,
       CheckAutoRollSettings,
       CheckTreeStatus,
-      FetchLatestRevision,
-      CheckLastPush,
       FetchLKGR,
+      CheckLastPush,
       PushToTrunk,
     ]