old_contents: #!/usr/bin/env python3
  #
  # Copyright 2013 The Flutter 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 json
  import zipfile
  import os
  import sys
  
  
  def _zip_dir(path, zip_file, prefix):
    path = path.rstrip('/\\')
    for root, dirs, files in os.walk(path):
      for file in files:
        zip_file.write(os.path.join(root, file), os.path.join(
            root.replace(path, prefix), file))
  
  
  def main(args):
    zip_file = zipfile.ZipFile(args.output, 'w', zipfile.ZIP_DEFLATED)
    if args.source_file:
      with open(args.source_file) as source_file:
        file_dict_list = json.load(source_file)
        for file_dict in file_dict_list:
          if os.path.isdir(file_dict['source']):
            _zip_dir(file_dict['source'], zip_file, file_dict['destination'])
          else:
            zip_file.write(file_dict['source'], file_dict['destination'])
    else:
      for path, archive_name in args.input_pairs:
        if os.path.isdir(path):
          _zip_dir(path, zip_file, archive_name)
        else:
          zip_file.write(path, archive_name)
    zip_file.close()
  
  
  if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description='This script creates zip files.')
    parser.add_argument('-o', dest='output', action='store',
        help='The name of the output zip file.')
    parser.add_argument('-i', dest='input_pairs', nargs=2, action='append',
        help='The input file and its destination location in the zip archive.')
    parser.add_argument('-f', dest='source_file', action='store',
        help='The path to the file list to zip.')
    sys.exit(main(parser.parse_args()))
  
new_contents: #!/usr/bin/env python3
  #
  # Copyright 2013 The Flutter 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 json
  import zipfile
  import os
  import stat
  import sys
  
  
  def _zip_dir(path, zip_file, prefix):
    path = path.rstrip('/\\')
    for root, dirs, files in os.walk(path):
      for file in files:
        if os.path.islink(os.path.join(root, file)):
          add_symlink(
              zip_file,
              os.path.join(root, file),
              os.path.join(root.replace(path, prefix), file)
          )
          continue
        zip_file.write(os.path.join(root, file), os.path.join(
            root.replace(path, prefix), file))
  
  
  def add_symlink(zip_file, source, target):
    """Adds a symlink to a zip file.
  
    Args:
      zip_file: The ZipFile obj where the symlink will be added.
      source: The full path to the symlink.
      target: The target path for the symlink within the zip file.
    """
    zip_info  = zipfile.ZipInfo(target)
    zip_info.create_system = 3 # Unix like system
    unix_st_mode = (stat.S_IFLNK | stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR |
                    stat.S_IRGRP | stat.S_IWGRP | stat.S_IXGRP | stat.S_IROTH |
                    stat.S_IWOTH | stat.S_IXOTH)
    zip_info.external_attr = unix_st_mode << 16
    zip_file.writestr(zip_info, source)
  
  
  def main(args):
    zip_file = zipfile.ZipFile(args.output, 'w', zipfile.ZIP_DEFLATED)
    if args.source_file:
      with open(args.source_file) as source_file:
        file_dict_list = json.load(source_file)
        for file_dict in file_dict_list:
          if os.path.islink(file_dict['source']):
            add_symlink(zip_file, file_dict['source'], file_dict['destination'])
            continue
          if os.path.isdir(file_dict['source']):
            _zip_dir(file_dict['source'], zip_file, file_dict['destination'])
          else:
            zip_file.write(file_dict['source'], file_dict['destination'])
    else:
      for path, archive_name in args.input_pairs:
        if os.path.islink(path):
          add_symlink(zip_file, path, archive_name)
          continue
        if os.path.isdir(path):
          _zip_dir(path, zip_file, archive_name)
        else:
          zip_file.write(path, archive_name)
    zip_file.close()
  
  
  if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description='This script creates zip files.')
    parser.add_argument('-o', dest='output', action='store',
        help='The name of the output zip file.')
    parser.add_argument('-i', dest='input_pairs', nargs=2, action='append',
        help='The input file and its destination location in the zip archive.')
    parser.add_argument('-f', dest='source_file', action='store',
        help='The path to the file list to zip.')
    sys.exit(main(parser.parse_args()))
  
subject: Add symlink support to zip script (#32257)