Add git-reup and friends

git_new_branch.py

Index: git_new_branch.py
diff --git a/git_new_branch.py b/git_new_branch.py
new file mode 100755
index 0000000000000000000000000000000000000000..1f93e07c9362401d40572deb0e4c36269adb34c0
--- /dev/null
+++ b/git_new_branch.py
@@ -0,0 +1,50 @@
+#!/usr/local/bin/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.
+
+import argparse
+import sys
+
+from git_common import run, root, set_config, get_or_create_merge_base
+
+
+def main():
+  parser = argparse.ArgumentParser(
+    formatter_class=argparse.ArgumentDefaultsHelpFormatter
+  )
+  parser.add_argument('branch_name')
+  g = parser.add_mutually_exclusive_group()
+  g.add_argument('--upstream_current', action='store_true',
+                 help='set upstream branch to current branch.')
+  g.add_argument('--upstream', metavar='REF', default=root(),
+                 help='upstream branch to track.')
+
+  parser.add_argument(
+    '--lkgr', action='store_const', const=('.', 'refs/tags/lkgr'),

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

indent +4

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

Done.

+    dest='basis_ref', help='set basis ref for new branch to lkgr.')
+
+  opts = parser.parse_args()
+
+  if opts.upstream_current:
+    if opts.basis_ref:
+      parser.error('Cannot specify basis_ref with upstream_current.')
+    run('checkout', '--track', '-b', opts.branch_name)
+  else:
+    if opts.basis_ref:

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

You implemented a general approach to tracking tags, but only allow lkgr to be
tracked. This is especially weird considering lkgr isn't even a tag yet, and
won't be until flag day.

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

Done.

+      # TODO(iannucci): ensure that basis_ref is an ancestor of HEAD?
+      run('checkout', '--no-track', '-b', opts.branch_name, opts.basis_ref)
+      run('branch', '-u', opts.upstream)
+      remote, merge = opts.basis_ref
+      set_config('branch.%s.remote', remote)
+      set_config('branch.%s.merge', merge)
+    else:
+      # TODO(iannucci): Detect unclean workdir then stash+pop if we need to
+      # teleport to a conflicting portion of history?
+      run('checkout', '--track', opts.upstream, '-b', opts.branch_name)
+
+  get_or_create_merge_base(opts.branch_name)
+
+
+if __name__ == '__main__':
+  sys.exit(main())