def install(h, pip, groups, save, save_dev, packages):
    """Install a pip or bower package."""
    if groups:
        groups = [text_type.strip(group) for group in groups.split(",")]
    else:
        groups = h.requirements.keys()

    if not packages:
        for group in groups:
            if group not in h.requirements:
                warning("{} not in requirements".format(group))
                continue
            install = (h.install_bower if group.startswith("bower")
                       else h.install_pip)
            for requirement in h.requirements[group]:
                install(str(requirement), save=False, save_dev=False)
    if pip:
        for package in packages:
            h.install_pip(package, save=save, save_dev=save_dev)
    else:
        for package in packages:
            h.install_bower(package, save=save, save_dev=save_dev)
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)