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#!/usr/bin/env python3
# SPDX-License-Identifier: LGPL-2.1-only
#
# Test to create a systemd scope with pid using cgcreate
#
# Copyright (c) 2023 Oracle and/or its affiliates.
# Author: Kamalesh Babulal <kamalesh.babulal@oracle.com>
#
from cgroup import Cgroup
from process import Process
from libcgroup import Mode
from run import RunError
import consts
import ftests
import sys
import os
CONTROLLERS = ['cpu', 'pids']
SLICE = 'libcgroup.slice'
CGNAME1 = os.path.join(SLICE, '084cgcreate1.scope')
CGNAME2 = os.path.join(SLICE, '084cgcreate2.scope')
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 Cgroup.get_cgroup_mode(config) != Mode.CGROUP_MODE_UNIFIED:
result = consts.TEST_SKIPPED
cause = 'This test requires the unified cgroup hierarchy'
return result, cause
def setup(config):
pass
def test(config):
result = consts.TEST_PASSED
cause = None
#
# Test 1: Pass invalid task pid as scope_pid and systemd scope creation
# should fail
#
try:
Cgroup.create_and_validate(config, CONTROLLERS, CGNAME1, create_scope=True,
scope_pid=1000000)
except RunError as re:
if 'Process with ID 1000000 does not exist' not in str(re):
raise re
#
# Test 2: Pass a valid task pid as scope_pid and systemd scope creation
# will succeed. Read the scope cgroup.procs to find if the task
# passed by us was used as scope task.
#
scope_pid = config.process.create_process(config)
Cgroup.create_and_validate(config, CONTROLLERS, CGNAME1, create_scope=True, scope_pid=scope_pid)
try:
pid = Cgroup.get_pids_in_cgroup(config, CGNAME1, CONTROLLERS[0])[0]
if scope_pid != pid:
result = consts.TEST_FAILED
cause = 'scope created with other pid {}, expected pid {}'.format(pid, scope_pid)
return result, cause
except RunError:
result = consts.TEST_FAILED
cause = 'Failed to read pid in {}\'s cgroup.procs'.format(CGNAME1)
return result, cause
#
# Test 3: Pass the already created task pid as scope_pid for a new systemd
# scope. This would mean the CGNAME1 should be killed and the pid
# should be the default scope task of CGNAME2
Cgroup.create_and_validate(config, CONTROLLERS, CGNAME2, create_scope=True, scope_pid=scope_pid)
# CGNAME1 should be deleted by the systemd.
try:
pid = Cgroup.get_pids_in_cgroup(config, CGNAME1, CONTROLLERS[0])[0]
except RunError as re:
if 'No such file or directory' not in re.stderr:
raise re
else:
result = consts.TEST_FAILED
cause = 'Erroneously succeeded reading cgroup.procs in {}'.format(CGNAME1)
return result, cause
try:
pid = Cgroup.get_pids_in_cgroup(config, CGNAME2, CONTROLLERS[0])[0]
if scope_pid != pid:
result = consts.TEST_FAILED
cause = 'scope created with other pid {}, expected pid {}'.format(pid, scope_pid)
return result, cause
except RunError:
result = consts.TEST_FAILED
cause = 'Failed to read pid in {}\'s cgroup.procs'.format(CGNAME2)
return result, cause
def teardown(config):
pid = Cgroup.get_pids_in_cgroup(config, CGNAME2, CONTROLLERS[0])[0]
Process.kill(config, pid)
# systemd will automatically remove the cgroup once there are no more pids in
# the cgroup, so we don't need to delete CGNAME2. But let's try to remove the
# slice
try:
Cgroup.delete(config, CONTROLLERS, SLICE)
except RunError:
pass
def main(config):
[result, cause] = prereqs(config)
if result != consts.TEST_PASSED:
return [result, cause]
setup(config)
[result, cause] = test(config)
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))
# vim: set et ts=4 sw=4:
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