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How to use fetch_necessary_packages method in autotest

Best Python code snippet using autotest_python

build_externals.py

Source:build_externals.py

...48    env_python_path = os.environ.get(env_python_path_varname, '')49    if install_dir+':' not in env_python_path:50        os.environ[env_python_path_varname] = ':'.join([51            install_dir, env_python_path])52    fetched_packages, fetch_errors = fetch_necessary_packages(package_dir,53                                                              install_dir)54    install_errors = build_and_install_packages(fetched_packages, install_dir)55    # Byte compile the code after it has been installed in its final56    # location as .pyc files contain the path passed to compile_dir().57    # When printing exception tracebacks, python uses that path first to look58    # for the source code before checking the directory of the .pyc file.59    # Don't leave references to our temporary build dir in the files.60    logging.info('compiling .py files in %s to .pyc', install_dir)61    compileall.compile_dir(install_dir, quiet=True)62    # Some things install with whacky permissions, fix that.63    external_packages.system("chmod -R a+rX '%s'" % install_dir)64    errors = fetch_errors + install_errors65    for error_msg in errors:66        logging.error(error_msg)67    return len(errors)68def fetch_necessary_packages(dest_dir, install_dir):69    """70    Fetches all ExternalPackages into dest_dir.71    @param dest_dir: Directory the packages should be fetched into.72    @param install_dir: Directory where packages will later installed.73    @returns A tuple containing two lists:74             * A list of ExternalPackage instances that were fetched and75               need to be installed.76             * A list of error messages for any failed fetches.77    """78    names_to_check = sys.argv[1:]79    errors = []80    fetched_packages = []81    for package_class in external_packages.ExternalPackage.subclasses:82        package = package_class()...

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