def extract_bower_zipfile(self, zip_file, dest, expected_version=None):
        bower_json = None
        root = None
        deps_installed = []
        for info in zip_file.infolist():
            if PurePath(info.filename).name == "bower.json":
                with zip_file.open(info) as f:
                    bower_json = json.load(f)
                    root = str(PurePath(info.filename).parent)
                break
        version = bower_json["version"]
        if expected_version is not None:
            expected_version = Bower.clean_semver(expected_version)
            if not semver.match(version, expected_version):
                click.secho("error: versions do not match ({} =/= {})".format(
                    version, expected_version))
                raise InvalidPackageError
        if "dependencies" in bower_json:
            for package, version in bower_json["dependencies"].items():
                url = Bower.get_package_url(package)
                deps_installed.extend(self.get_bower_package(
                    url, dest=dest, version=version))
        ignore_patterns = [GitIgnorePattern(ig) for ig in bower_json["ignore"]]
        path_spec = PathSpec(ignore_patterns)
        namelist = [path for path in zip_file.namelist()
                    if PurePath(path).parts[0] == root]
        ignored = list(path_spec.match_files(namelist))
        for path in namelist:
            dest_path = PurePath(
                bower_json["name"],
                *PurePath(path).parts[1:])

            if path in ignored:
                continue

            for path in ignored:
                for parent in PurePath(path):
                    if parent in ignored:
                        continue

            if path.endswith("/"):
                if list(path_spec.match_files([str(dest_path)])):
                    ignored.append(PurePath(path))
                elif not (dest / dest_path).is_dir():
                    (dest / dest_path).mkdir(parents=True)
            else:
                target_path = dest / dest_path.parent / dest_path.name
                source = zip_file.open(path)
                target = target_path.open("wb")
                with source, target:
                    shutil.copyfileobj(source, target)
        deps_installed.append((bower_json["name"], bower_json["version"]))
        return deps_installed
def _handle_signal_gracefully(cls, signum, signame, traceback_lines):
        """Signal handler for non-fatal signals which raises or logs an error and exits with
        failure."""
        # Extract the stack, and format an entry to be written to the exception log.
        formatted_traceback = cls._format_traceback(
            traceback_lines=traceback_lines, should_print_backtrace=True
        )
        signal_error_log_entry = cls._CATCHABLE_SIGNAL_ERROR_LOG_FORMAT.format(
            signum=signum, signame=signame, formatted_traceback=formatted_traceback
        )
        # TODO: determine the appropriate signal-safe behavior here (to avoid writing to our file
        # descriptors re-entrantly, which raises an IOError).
        # This method catches any exceptions raised within it.
        cls.log_exception(signal_error_log_entry)

        # Create a potentially-abbreviated traceback for the terminal or other interactive stream.
        formatted_traceback_for_terminal = cls._format_traceback(
            traceback_lines=traceback_lines,
            should_print_backtrace=cls._should_print_backtrace_to_terminal,
        )
        terminal_log_entry = cls._CATCHABLE_SIGNAL_ERROR_LOG_FORMAT.format(
            signum=signum, signame=signame, formatted_traceback=formatted_traceback_for_terminal
        )
        # Exit, printing the output to the terminal.
        cls._exit_with_failure(terminal_log_entry)