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system_frr.py
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system_frr.py
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#!/usr/bin/env python3
#
# Copyright (C) 2021-2023 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from pathlib import Path
from sys import exit
from vyos import ConfigError
from vyos import airbag
from vyos.config import Config
from vyos.logger import syslog
from vyos.template import render_to_string
from vyos.utils.file import read_file
from vyos.utils.file import write_file
from vyos.utils.process import run
airbag.enable()
# path to daemons config and config status files
config_file = '/etc/frr/daemons'
vyos_status_file = '/tmp/vyos-config-status'
# path to watchfrr for FRR control
watchfrr = '/usr/lib/frr/watchfrr.sh'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['system', 'frr']
frr_config = conf.get_config_dict(base, get_first_key=True)
return frr_config
def verify(frr_config):
# Nothing to verify here
pass
def generate(frr_config):
# read daemons config file
daemons_config_current = read_file(config_file)
# generate new config file
daemons_config_new = render_to_string('frr/daemons.frr.tmpl', frr_config)
# update configuration file if this is necessary
if daemons_config_new != daemons_config_current:
syslog.warning('FRR daemons configuration file need to be changed')
write_file(config_file, daemons_config_new)
frr_config['config_file_changed'] = True
def apply(frr_config):
# check if this is initial commit during boot or intiated by CLI
# if the file exists, this must be CLI commit
commit_type_cli = Path(vyos_status_file).exists()
# display warning to user
if commit_type_cli and frr_config.get('config_file_changed'):
# Since FRR restart is not safe thing, better to give
# control over this to users
print('''
You need to reboot a router (preferred) or restart FRR
to apply changes in modules settings
''')
# restart FRR automatically. DUring the initial boot this should be
# safe in most cases
if not commit_type_cli and frr_config.get('config_file_changed'):
syslog.warning('Restarting FRR to apply changes in modules')
run(f'{watchfrr} restart')
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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