def run_process()

in nubia/internal/helpers.py [0:0]

• 12 lines of code
• 2 McCabe index (conditional complexity)

def run_process(process_arg_list, on_interrupt=None, working_dir=None):
    """
    This runs a process using subprocess python module but handles SIGINT
    properly. In case we received SIGINT (Ctrl+C) we will send a SIGTERM to
    terminate the subprocess and call the supplied callback.

    @param process_arg_list Is the list you would send to subprocess.Popen()
    @param on_interrupt     Is a python callable that will be called in case we
                            received SIGINT

    This may raise OSError if the command doesn't exist.

    @return the return code of this process after completion
    """
    assert isinstance(process_arg_list, list)
    old_handler = signal.getsignal(signal.SIGINT)
    process = subprocess.Popen(process_arg_list, cwd=working_dir)

    def handler(signum, frame):
        process.send_signal(signal.SIGTERM)
        # call the interrupted callack
        if on_interrupt:
            on_interrupt()

    # register the signal handler
    signal.signal(signal.SIGINT, handler)
    rv = process.wait()
    # after the process terminates, restore the original SIGINT handler
    # whatever it was.
    signal.signal(signal.SIGINT, old_handler)
    return rv