Add git-reup and friends

git_reparent_branch.py

Index: git_reparent_branch.py
diff --git a/git_reparent_branch.py b/git_reparent_branch.py
new file mode 100755
index 0000000000000000000000000000000000000000..3f3914f0589e5768ce90b53bf186037b2609bce9
--- /dev/null
+++ b/git_reparent_branch.py
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+#!/usr/bin/env python
+# 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.
+

[agable, 2014/03/21 01:14:21]

docstring

+import sys
+
+from git_common import upstream, current_branch, run
+from git_common import get_or_create_merge_base
+
+import subprocess2
+
+def main(argv):
+  # TODO(iannucci): Add --verbose
+  # TODO(iannucci): Merge-base-tag before altering parent info.
+  # TODO(iannucci): Allow specification of the branch-to-reparent
+
+  assert len(argv) == 2, "Must supply new parent"

[agable, 2014/03/21 01:14:21]

use argparse

+  branch = current_branch()
+  new_parent = argv[1]
+  cur_parent = upstream(branch)
+  assert branch != 'HEAD', 'Must be on the branch you want to reparent'
+  assert cur_parent != new_parent
+
+  get_or_create_merge_base(branch, cur_parent)
+
+  print "Reparenting %s to track %s (was %s)" % (branch, new_parent, cur_parent)
+  run('branch', '--set-upstream-to', new_parent, branch)
+  try:
+    subprocess2.check_call(['git', 'rebase-update'])
+  except:
+    print "Resetting parent back to %s" % (cur_parent)

[agable, 2014/03/21 01:14:21]

Print failure message in between; otherwise not clear why it is setting back.

[iannucci, 2014/03/22 04:17:35]

The rebase-update command already prints a lot of error material when it can't
do it's operation cleanly.

+    run('branch', '--set-upstream-to', cur_parent, branch)
+    raise
+
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))
+
+