#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright 2018-present ScyllaDB
#

#
# SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0

import os
import sys
import argparse
from scylla_util import is_container, sysconfig_parser

if __name__ == '__main__':
    if not is_container() and os.getuid() > 0:
        print('Requires root permission.')
        sys.exit(1)
    parser = argparse.ArgumentParser(description='Configure cpuset configuration for Scylla.')
    parser.add_argument('--cpuset',
                        help='CPUs to use (in cpuset(7) format; default: all))')
    parser.add_argument('--smp',
                        help='number of threads (default: one per CPU)')
    args = parser.parse_args()
    if not args.cpuset and not args.smp:
        parser.print_help()
        sys.exit(1)

    cpuset = smp = None
    try:
        cfg = sysconfig_parser('/etc/scylla.d/cpuset.conf')
        line = cfg.get('CPUSET')
        cpuset_args = parser.parse_args(line.split())
        cpuset = cpuset_args.cpuset
        smp = cpuset_args.smp
    except:
        pass
    if cpuset != args.cpuset or smp != args.smp:
        if os.path.exists('/etc/scylla.d/perftune.yaml'):
            os.remove('/etc/scylla.d/perftune.yaml')

        cfg.set('CPUSET', '{cpuset}{smp}'.format( \
                cpuset='--cpuset {} '.format(args.cpuset) if args.cpuset else '', \
                smp='--smp {} '.format(args.smp) if args.smp else '' \
                ))
        cfg.commit()