def obtain_lock()

in launcher/sdw_util/Util.py [0:0]

• 15 lines of code
• 3 McCabe index (conditional complexity)

def obtain_lock(basename):
    """
    Obtain an exclusive lock during the execution of this process.
    """
    lock_file = os.path.join(LOCK_DIRECTORY, basename)
    try:
        lh = open(lock_file, "w")
    except PermissionError:
        sdlog.error(
            f"Error writing to lock file '{lock_file}'. User may lack the required permissions."
        )
        return None

    try:
        # Obtain an exclusive, nonblocking lock
        fcntl.lockf(lh, fcntl.LOCK_EX | fcntl.LOCK_NB)
    except OSError:
        sdlog.error(LOCK_ERROR.format(lock_file))
        return None

    return lh