Re: [RFC][StGit PATCH] Add support for merge-friendly branches

@@ -67,10 +67,10 @@ options = [

 directory = common.DirectoryHasRepositoryLib()

-def __create_commit(repository, tree, parents, options):
+def __create_commit(repository, tree, parents, options, message = ''):
     """Return a new Commit object."""
     cd = git.CommitData(
-        tree = tree, parents = parents, message = '',
+        tree = tree, parents = parents, message = message,
         author = git.Person.author(), committer = git.Person.committer())
     cd = common.update_commit_data(cd, options, allow_edit = True)

@@ -106,8 +106,10 @@ def func(parser, options, args):
     # base by setting two parents.
     merge_bases = repository.get_merge_bases(public_head, stack.base)
     if not stack.base in merge_bases:
+        message = 'Merge ' + repository.describe(stack.base)
         public_head = __create_commit(repository, stack.head.data.tree,
-                                      [public_head, stack.base], options)
+                                      [public_head, stack.base], options,
+                                      message)
         repository.refs.set(public_ref, public_head, 'publish')
         out.info('Merged the stack base into "%s"' % public_ref)
         return

@@ -614,6 +614,10 @@ class Repository(RunWithEnv):
         sha1_list = self.run(['git', 'merge-base', '--all',
                               commit1.sha1, commit2.sha1]).output_lines()
         return set(self.get_commit(sha1) for sha1 in sha1_list)
+    def describe(self, commit):
+        """Use git describe --all on the given commit."""
+        return self.run(['git', 'describe', '--all', commit.sha1]
+                       ).discard_stderr().discard_exitcode().raw_output()
     def simple_merge(self, base, ours, theirs):
         index = self.temp_index()
         try: