#!/usr/bin/env python3
# SPDX-License-Identifier: LGPL-2.1-only
#
# Basic cgrules functionality test
#
# Copyright (c) 2021 Oracle and/or its affiliates.
# Author: Tom Hromatka <tom.hromatka@oracle.com>
#

from cgroup import Cgroup, CgroupVersion
from process import Process
import consts
import ftests
import sys
import os

CONTROLLER = 'cpuset'
CGNAME = '007cgrules'

# move all perl processes to the 007cgrules cgroup in the
# cpuset controller
CGRULE = '*:/usr/bin/perl cpuset {}'.format(CGNAME)

cg = Cgroup(CGNAME)


def prereqs(config):
    result = consts.TEST_PASSED
    cause = None

    if config.args.container:
        result = consts.TEST_SKIPPED
        cause = 'This test cannot be run within a container'
        return result, cause

    if CgroupVersion.get_version('cpuset') != CgroupVersion.CGROUP_V2:
        result = consts.TEST_SKIPPED
        cause = 'This test requires the cgroup v2 cpuset controller'

    return result, cause


def setup(config):
    Cgroup.create(config, CONTROLLER, CGNAME)

    Cgroup.set_cgrules_conf(config, CGRULE, append=False)
    cg.start_cgrules(config)


def test(config):
    result = consts.TEST_PASSED
    cause = None

    pid = config.process.create_process(config)
    proc_cgroup = Process.get_cgroup(config, pid, CONTROLLER)

    # proc/{pid}/cgroup alsways prepends a '/' to the cgroup path
    if proc_cgroup != os.path.join('/', CGNAME):
        result = consts.TEST_FAILED
        cause = (
                    'PID {} was expected to be in cgroup {} but is in '
                    'cgroup {}'
                    ''.format(pid, os.path.join('/', CGNAME), proc_cgroup)
                )

    return result, cause


def teardown(config):
    # destroy the child processes
    config.process.join_children(config)
    cg.join_children(config)
    Cgroup.delete(config, CONTROLLER, CGNAME, recursive=False)


def main(config):
    [result, cause] = prereqs(config)
    if result != consts.TEST_PASSED:
        return [result, cause]

    try:
        setup(config)
        [result, cause] = test(config)
    finally:
        teardown(config)

    return [result, cause]


if __name__ == '__main__':
    config = ftests.parse_args()
    # this test was invoked directly.  run only it
    config.args.num = int(os.path.basename(__file__).split('-')[0])
    sys.exit(ftests.main(config))

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