Add step generator protocol, remove annotated_checkout, remove script.

scripts/slave/git_setup.py

+# Copyright (c) 2013 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.
+
+"""This script ensures that a given directory is an initialized git repo."""
+
+import argparse
+import logging
+import os
+import subprocess
+import sys
+
+
+def run_git(*args, **kwargs):
+  """Runs git with given arguments.
+
+  kwargs are passed through to subprocess.
+
+  If the kwarg 'throw' is provided, this behaves as check_call, otherwise will
+  return git's return value.
+  """
+  logging.info('Running: git %s %s', args, kwargs)
+  func = subprocess.check_call if kwargs.pop('throw', True) else subprocess.call
+  return func(('git',)+args, **kwargs)
+
+
+def main():
+  parser = argparse.ArgumentParser()
+  parser.add_argument('path', help='Path to prospective git repo.',
+                      required=True)
+  parser.add_argument('url', help='URL of remote to make origin.',
+                      required=True)
+  parser.add_argument('verbose', action='store_true')
+  opts = parser.parse_args()
+
+  path = opts.path
+  url = opts.url
+
+  logging.getLogger().setLevel(logging.DEBUG if opts.verbose else logging.WARN)
+
+  if not os.path.exists(path):
+    os.makedirs(path)
+
+  exists = run_git('branch', cwd=path, throw=False) == 0
+  if exists:
+    run_git('remote', 'rm', 'origin', cwd=path)
+  else:
+    run_git('init', cwd=path)
+  run_git('remote', 'add', 'origin', url, cwd=path)
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())