depot_tools/git-reparent-branch

#!/usr/bin/env bash
# Copyright 2014 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# git_reparent_branch.py -- Change the parent (upstream) branch of the current
# branch. Afterwards, run a `git rebase-update` cycle to ensure that all
# branches correctly reflect their parentage.

. $(type -P python_git_runner.sh)