gn/standalone/check_buildtool_exists.py

#!/usr/bin/env python
# Copyright (C) 2018 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
""" Script to check whether a given buildtool folder exists.

Prints a user-friendly message if it doesn't.
"""

import os
import sys
import argparse


def main():
  parser = argparse.ArgumentParser(description='Test path for existence')
  parser.add_argument('path', help='Path to test for existence')
  parser.add_argument('--touch', help='Touch this path on success')
  args = parser.parse_args()

  if not os.path.exists(args.path):
    err = '\x1b[31mCannot find %s/%s\nRun tools/install-build-deps --ui\x1b[0m'
    print >> sys.stderr, err % (os.path.abspath('.'), sys.argv[1])
    return 127

  if args.touch:
    with open(args.touch, 'a'):
      os.utime(args.touch, None)

  return 0


if __name__ == '__main__':
  sys.exit(main())