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#!/opt/cloudlinux/venv/bin/python3 -bb
# coding: utf-8
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2018 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
import fcntl
import sys
import time
import os
from argparse import ArgumentParser
from clcommon.sysctl import SysCtlConf, SysCtlMigrate, SYSCTL_CL_CONF_FILE, SYSCTL_FILE
SELF_LOCK_FILE = '/var/log/cl_sysctl.lock'
def create_parser():
config_help = 'Path to sysctl config file. It\'s %(default)s by default'
config_path = SYSCTL_CL_CONF_FILE
parser = ArgumentParser(description='Utility for working with sysctl configs. INTERNAL USAGE ONLY!')
subparsers = parser.add_subparsers(dest='command')
subparser_set = subparsers.add_parser(name='set', help='Set or add the the sysctl parameter to the sysctl config')
subparser_set.add_argument('-P', '--parameter', action='store', required=True,
help='Name of the sysctl parameter')
subparser_set.add_argument('-V', '--value', action='store', required=True,
help='Value of the sysctl parameter')
subparser_set.add_argument('-C', '--config', action='store',
help=config_help,
default=config_path)
subparser_get = subparsers.add_parser(name='get', help='Get the sysctl parameter')
subparser_get.add_argument('-P', '--parameter', action='store', required=True,
help='Name of the sysctl parameter')
subparser_get.add_argument('-C', '--config', action='store',
help=config_help,
default=config_path)
subparser_remove = subparsers.add_parser(name='remove', help='Remove the sysctl parameter from the sysctl config')
subparser_remove.add_argument('-P', '--parameter', action='store', required=True,
help='Name of the sysctl parameter')
subparser_remove.add_argument('-C', '--config', action='store',
help=config_help,
default=config_path)
subparsers_migrate = subparsers.add_parser(name='migrate',
help='Migrate sysctl param from {} to {}'.format(
SYSCTL_FILE,
SYSCTL_CL_CONF_FILE,
))
subparsers_migrate.add_argument('-P', '--parameter', action='store', required=True,
help='Name of the sysctl parameter')
subparsers_migrate.add_argument('-dV', '--default-value', action='store',
help='Default value of sysctl parameter if it is absent in source file')
return parser
def _parse_args(argv):
parser = create_parser()
params = parser.parse_args(argv)
return params
def main_(args):
params = _parse_args(args)
command = params.command
if command == 'set':
config_file = params.config
sysctl = SysCtlConf(config_file=config_file)
sysctl.set(name=params.parameter,
value=params.value)
elif command == 'get':
config_file = params.config
sysctl = SysCtlConf(config_file=config_file)
value = sysctl.get(name=params.parameter)
print(value)
elif command == 'remove':
config_file = params.config
sysctl = SysCtlConf(config_file=config_file)
sysctl.remove(name=params.parameter)
elif command == 'migrate':
sysctl_migrate = SysCtlMigrate()
sysctl_migrate.migrate(
param_name=params.parameter,
default_value=params.default_value,
)
def main():
with open(SELF_LOCK_FILE, 'w') as lock_file:
lock_file_is_locked = True
for _ in range(20):
try:
fcntl.flock(lock_file, fcntl.LOCK_EX | fcntl.LOCK_NB)
lock_file_is_locked = False
break
except IOError:
print('Another app is currently holding the cl_sysctl lock; waiting for it to exit.')
time.sleep(5)
if lock_file_is_locked:
print('Another app is still holding the cl_sysctl lock after 20 attempts. Please, try again later.')
exit(1)
else:
main_(sys.argv[1:])
try:
os.remove(SELF_LOCK_FILE)
except (IOError, OSError):
pass
if __name__ == '__main__':
main()