v8/tools/push-to-trunk/auto_roll.py

#!/usr/bin/env python
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import argparse
import json
import os
import re
import sys
import urllib

from common_includes import *
import push_to_trunk

SETTINGS_LOCATION = "SETTINGS_LOCATION"

CONFIG = {
  PERSISTFILE_BASENAME: "/tmp/v8-auto-roll-tempfile",
  DOT_GIT_LOCATION: ".git",
  SETTINGS_LOCATION: "~/.auto-roll",
}


class Preparation(Step):
  MESSAGE = "Preparation."

  def RunStep(self):
    self.InitialEnvironmentChecks()
    self.CommonPrepare()


class CheckAutoRollSettings(Step):
  MESSAGE = "Checking settings file."

  def RunStep(self):
    settings_file = os.path.realpath(self.Config(SETTINGS_LOCATION))
    if os.path.exists(settings_file):
      settings_dict = json.loads(FileToText(settings_file))
      if settings_dict.get("enable_auto_roll") is False:
        self.Die("Push to trunk disabled by auto-roll settings file: %s"
                 % settings_file)


class CheckTreeStatus(Step):
  MESSAGE = "Checking v8 tree status message."

  def RunStep(self):
    status_url = "https://v8-status.appspot.com/current?format=json"
    status_json = self.ReadURL(status_url, wait_plan=[5, 20, 300, 300])
    self["tree_message"] = json.loads(status_json)["message"]
    if re.search(r"nopush|no push", self["tree_message"], flags=re.I):
      self.Die("Push to trunk disabled by tree state: %s"
               % self["tree_message"])


class FetchLatestRevision(Step):
  MESSAGE = "Fetching latest V8 revision."

  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)


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))

    # 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
      # 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])


class PushToTrunk(Step):
  MESSAGE = "Pushing to trunk if possible."

  def PushTreeStatus(self, message):
    if not self._options.status_password:
      print "Skipping tree status update without password file."
      return
    params = {
      "message": message,
      "username": "v8-auto-roll@chromium.org",
      "password": FileToText(self._options.status_password).strip(),
    }
    params = urllib.urlencode(params)
    print "Pushing tree status: '%s'" % message
    self.ReadURL("https://v8-status.appspot.com/status", params,
                 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))


class AutoRoll(ScriptsBase):
  def _PrepareOptions(self, parser):
    parser.add_argument("-c", "--chromium",
                        help=("Deprecated."))
    parser.add_argument("-p", "--push",
                        help="Push to trunk. Dry run if unspecified.",
                        default=False, action="store_true")
    parser.add_argument("--status-password",
                        help="A file with the password to the status app.")

  def _ProcessOptions(self, options):
    if not options.author or not options.reviewer:  # pragma: no cover
      print "You need to specify author and reviewer."
      return False
    options.requires_editor = False
    return True

  def _Steps(self):
    return [
      Preparation,
      CheckAutoRollSettings,
      CheckTreeStatus,
      FetchLatestRevision,
      CheckLastPush,
      FetchLKGR,
      PushToTrunk,
    ]


if __name__ == "__main__":  # pragma: no cover
  sys.exit(AutoRoll(CONFIG).Run())