Implement auto-roll script.

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
new file mode 100644
index 0000000000000000000000000000000000000000..d2ca52a3626919ae6759e83e28e16d4f35ba144e
--- /dev/null
+++ b/tools/push-to-trunk/auto_roll.py
@@ -0,0 +1,107 @@
+#!/usr/bin/env python
+# Copyright 2014 the V8 project 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 argparse
+import json
+import os
+import sys
+import urllib
+
+from common_includes import *
+import chromium_roll
+
+CR_DEPS_URL = 'http://src.chromium.org/svn/trunk/src/DEPS'
+
+class CheckActiveRoll(Step):
+  MESSAGE = "Check active roll."
+
+  @staticmethod
+  def ContainsChromiumRoll(changes):
+    for change in changes:
+      if change["subject"].startswith("Update V8 to"):
+        return True
+    return False
+
+  def RunStep(self):
+    params = {
+      "closed": 3,
+      "owner": self._options.author,
+      "limit": 30,
+      "format": "json",
+    }
+    params = urllib.urlencode(params)
+    search_url = "https://codereview.chromium.org/search"
+    result = self.ReadURL(search_url, params, wait_plan=[5, 20])
+    if self.ContainsChromiumRoll(json.loads(result)["results"]):
+      print "Stop due to existing Chromium roll."
+      return True
+
+
+class DetectLastPush(Step):
+  MESSAGE = "Detect commit ID of the last push to trunk."
+
+  def RunStep(self):
+    push_hash = self.FindLastTrunkPush()
+    self["last_push"] = self.GitSVNFindSVNRev(push_hash)
+
+
+class DetectLastRoll(Step):
+  MESSAGE = "Detect commit ID of the last Chromium roll."
+
+  def RunStep(self):
+    # Interpret the DEPS file to retrieve the v8 revision.
+    Var = lambda var: '%s'
+    exec(self.ReadURL(CR_DEPS_URL))
+    last_roll = vars['v8_revision']
+    if last_roll >= self["last_push"]:
+      print("There is no newer v8 revision than the one in Chromium (%s)."
+            % last_roll)
+      return True
+
+
+class RollChromium(Step):
+  MESSAGE = "Roll V8 into Chromium."
+
+  def RunStep(self):
+    if self._options.roll:
+      R = chromium_roll.ChromiumRoll
+      self._side_effect_handler.Call(
+          R(chromium_roll.CONFIG, self._side_effect_handler).Run,
+          ["--author", self._options.author,
+           "--reviewer", self._options.reviewer,
+           "--chromium", self._options.chromium,
+           "--force"])
+
+
+class AutoRoll(ScriptsBase):
+  def _PrepareOptions(self, parser):
+    group = parser.add_mutually_exclusive_group()
+    parser.add_argument("-c", "--chromium", required=True,
+                        help=("The path to your Chromium src/ "
+                              "directory to automate the V8 roll."))
+    parser.add_argument("--roll",
+                        help="Make Chromium roll. Dry run if unspecified.",
+                        default=False, action="store_true")
+
+  def _ProcessOptions(self, options):  # pragma: no cover
+    if not options.reviewer:
+      print "A reviewer (-r) is required."
+      return False
+    if not options.author:
+      print "An author (-a) is required."
+      return False
+    return True
+
+  def _Steps(self):
+    return [
+      CheckActiveRoll,
+      DetectLastPush,
+      DetectLastRoll,
+      RollChromium,
+    ]
+
+
+if __name__ == "__main__":  # pragma: no cover
+  sys.exit(AutoRoll(CONFIG).Run())