<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def config_read():
 """Read config info from config file."""

    config_file = (u"{0}config.ini".format(CONFIG_DIR))
    if not os.path.isfile(config_file):
        config_make(config_file)
    config = configparser.ConfigParser(allow_no_value=True)
    try:
        config.read(config_file, encoding='utf-8')
    except IOError:
        print("Error reading config file: {}".format(config_file))
        sys.exit()
    # De-duplicate provider-list
    providers = config_prov(config)
    # Read credentials for listed providers
    (cred, to_remove) = config_cred(config, providers)
    # remove unsupported and credential-less providers
    for item in to_remove:
        providers.remove(item)
    return cred, providers