[Release] Automatically notify mailing list on a pending merge

tools/release/create_release.py

Index: tools/release/create_release.py
diff --git a/tools/release/create_release.py b/tools/release/create_release.py
index 3bbb50e491aa5bc175d747f3af996a8c4236226d..7477ea1461f5ebc8b10de654fd7136033a8292b4 100755
--- a/tools/release/create_release.py
+++ b/tools/release/create_release.py
@@ -11,7 +11,6 @@ import urllib2
 
 from common_includes import *
 
-
 class Preparation(Step):
   MESSAGE = "Preparation."
 
@@ -164,6 +163,7 @@ class MakeBranch(Step):
     self.Git("checkout -b work-branch %s" % self["push_hash"])
     self.GitCheckoutFile(CHANGELOG_FILE, self["latest_version"])
     self.GitCheckoutFile(VERSION_FILE, self["latest_version"])
+    self.GitCheckoutFile(WATCHLISTS_FILE, self["latest_version"])
 
 
 class AddChangeLog(Step):
@@ -183,6 +183,19 @@ class SetVersion(Step):
     self.SetVersion(os.path.join(self.default_cwd, VERSION_FILE), "new_")
 
 
+class EnableMergeWatchlist(Step):
+  MESSAGE = "Enable watchlist entry for merge notifications."
+
+  def RunStep(self):
+    old_watchlist_content = FileToText(os.path.join(self.default_cwd,
+                                                    WATCHLISTS_FILE))
+    new_watchlist_content = re.sub("(# 'v8-merges@googlegroups\.com',)",
+                                   "'v8-merges@googlegroups.com',",
+                                   old_watchlist_content)
+    TextToFile(new_watchlist_content, os.path.join(self.default_cwd,
+                                                   WATCHLISTS_FILE))
+
+
 class CommitBranch(Step):
   MESSAGE = "Commit version and changelog to new branch."
 
@@ -288,6 +301,7 @@ class CreateRelease(ScriptsBase):
       MakeBranch,
       AddChangeLog,
       SetVersion,
+      EnableMergeWatchlist,
       CommitBranch,
       PushBranch,
       TagRevision,