text: #!/usr/bin/env python
  # Copyright (C) 2015 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.
  
  """This downloads an NPM binary, and bundles it with its dependencies.
  
  For full instructions on adding new binaries to the build, see
  http://gerrit-review.googlesource.com/Documentation/dev-bazel.html#npm-binary
  """
  
  from __future__ import print_function
  
  import atexit
  import json
  import os
  import shutil
  import subprocess
  import sys
  import tarfile
  import tempfile
  
  
  def is_bundled(tar):
      # No entries for directories, so scan for a matching prefix.
      for entry in tar.getmembers():
          if entry.name.startswith('package/node_modules/'):
              return True
      return False
  
  
  def bundle_dependencies():
      with open('package.json') as f:
          package = json.load(f)
      package['bundledDependencies'] = list(package['dependencies'].keys())
      with open('package.json', 'w') as f:
          json.dump(package, f)
  
  
  def main(args):
      if len(args) != 2:
          print('Usage: %s <package> <version>' % sys.argv[0], file=sys.stderr)
          return 1
  
      name, version = args
      filename = '%s-%s.tgz' % (name, version)
      url = 'https://registry.npmjs.org/%s/-/%s' % (name, filename)
  
      tmpdir = tempfile.mkdtemp()
      tgz = os.path.join(tmpdir, filename)
      atexit.register(lambda: shutil.rmtree(tmpdir))
  
      subprocess.check_call(['curl', '--proxy-anyauth', '-ksfo', tgz, url])
      with tarfile.open(tgz, 'r:gz') as tar:
          if is_bundled(tar):
              print('%s already has bundled node_modules' % filename)
              return 1
          tar.extractall(path=tmpdir)
  
      oldpwd = os.getcwd()
      os.chdir(os.path.join(tmpdir, 'package'))
      bundle_dependencies()
      subprocess.check_call(['npm', 'install'])
      subprocess.check_call(['npm', 'pack'])
      shutil.copy(filename, os.path.join(oldpwd, filename))
      return 0
  
  
  if __name__ == '__main__':
      sys.exit(main(sys.argv[1:]))
  