Add initial 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 100755
index 0000000000000000000000000000000000000000..9547301184b9f438f71dbaaa775b245a366be8ba
--- /dev/null
+++ b/tools/push-to-trunk/auto_roll.py
@@ -0,0 +1,119 @@
+#!/usr/bin/env python
+# Copyright 2013 the V8 project authors. All rights reserved.
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+#       copyright notice, this list of conditions and the following
+#       disclaimer in the documentation and/or other materials provided
+#       with the distribution.
+#     * Neither the name of Google Inc. nor the names of its
+#       contributors may be used to endorse or promote products derived
+#       from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import optparse
+import re
+import sys
+import urllib2
+
+from common_includes import *
+
+CONFIG = {
+  PERSISTFILE_BASENAME: "/tmp/v8-auto-roll-tempfile",
+  DOT_GIT_LOCATION: ".git",
+}
+
+
+class Preparation(Step):
+  def __init__(self):
+    Step.__init__(self, "Preparation.")
+
+  def RunStep(self):
+    self.InitialEnvironmentChecks()
+    self.CommonPrepare()
+
+
+class FetchLatestRevision(Step):
+  def __init__(self):
+    Step.__init__(self, "Fetching latest V8 revision.")
+
+  def RunStep(self):
+    log = self.Git("svn log -1 --oneline").strip()
+    match = re.match(r"^r(\d+) ", log)
+    if not match:
+      self.Die("Could not extract current svn revision from log.")
+    self.Persist("latest", match.group(1))
+
+
+class FetchLKGR(Step):
+  def __init__(self):
+    Step.__init__(self, "Fetching V8 LKGR.")
+
+  def RunStep(self):
+    lkgr_url = "https://v8-status.appspot.com/lkgr"
+    try:
+      # pylint: disable=E1121
+      url_fh = urllib2.urlopen(lkgr_url, None, 60)
+    except urllib2.URLError:
+      self.Die("URLException while fetching %s" % lkgr_url)
+    try:
+      self.Persist("lkgr", url_fh.read())
+    finally:
+      url_fh.close()
+
+
+class PushToTrunk(Step):
+  def __init__(self):
+    Step.__init__(self, "Pushing to trunk if possible.")
+
+  def RunStep(self):
+    self.RestoreIfUnset("latest")
+    self.RestoreIfUnset("lkgr")
+    latest = int(self._state["latest"])
+    lkgr = int(self._state["lkgr"])
+    if latest == lkgr:
+      print "ToT (r%d) is clean. Pushing to trunk." % latest
+      # TODO(machenbach): Call push to trunk script.
+    else:
+      print("ToT (r%d) is ahead of the LKGR (r%d). Skipping push to trunk."
+            % (latest, lkgr))
+
+
+def BuildOptions():
+  result = optparse.OptionParser()
+  result.add_option("-s", "--step", dest="s",
+                    help="Specify the step where to start work. Default: 0.",
+                    default=0, type="int")
+  return result
+
+
+def Main():
+  parser = BuildOptions()
+  (options, args) = parser.parse_args()
+
+  step_classes = [
+    Preparation,
+    FetchLatestRevision,
+    FetchLKGR,
+    PushToTrunk,
+  ]
+
+  RunScript(step_classes, CONFIG, options, DEFAULT_SIDE_EFFECT_HANDLER)
+
+if __name__ == "__main__":
+  sys.exit(Main())