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#!/usr/bin/env python3
#
# Copyright (C) VyOS Inc.
#
# 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/>.
"""Render the FRR configuration and reload FRR without vyos-configd.
Only vyos-configd renders FRR, and only at the end of a commit it handled
itself. Two paths need a render without it: a DHCP lease event, which changes
the rendered configuration without any CLI change, and a commit which fell back
to running the conf-mode scripts directly."""
import sys
from argparse import ArgumentParser
from time import sleep
from vyos.config import Config
from vyos.frrender import FRRender
from vyos.frrender import frr_applied_config_file
from vyos.frrender import frr_config_file
from vyos.frrender import frr_render_lock
from vyos.frrender import get_frrender_dict
from vyos.utils.commit import commit_in_progress2
from vyos.utils.file import read_file
from vyos import ConfigError
def render() -> None:
"""Reload FRR if the rendered configuration differs from the one FRR was
last reloaded with.
A fresh instance has no cached configuration, thus its own change detection
can not be used here. The rendered file is no substitute for it - a render
which failed before the reload leaves it unapplied."""
frr = FRRender()
frr.generate(get_frrender_dict(Config()))
if read_file(frr_config_file) == read_file(frr_applied_config_file, None):
return
frr.apply()
if __name__ == '__main__':
parser = ArgumentParser()
# The active configuration only changes once a commit is complete. Reading
# it earlier renders the pre-commit state, which the commit then never
# corrects as its own FRR render has already run. Not for callers which
# are part of a commit - they would wait for themselves.
parser.add_argument('--after-commit', action='store_true',
help='Wait for a running commit to complete first')
args = parser.parse_args()
while args.after_commit and commit_in_progress2():
sleep(0.25)
try:
with frr_render_lock():
render()
except ConfigError as e:
print(e)
sys.exit(1)
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