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vyos-config-host-name.py
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vyos-config-host-name.py
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#!/usr/bin/env python3
#
# Copyright (C) 2018 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/>.
#
#
import os
import re
import sys
import subprocess
from vyos.config import Config
from vyos.util import ConfigError
hostname_regex = re.compile("^[A-Za-z0-9][-.A-Za-z0-9]*[A-Za-z0-9]$")
def get_config():
conf = Config()
hostname = conf.return_value("system host-name")
domain = conf.return_value("system domain-name")
# No one likes fixups, but we really don't want VyOS fail to boot
# if hostname is not in the config
if not hostname:
hostname = "vyos"
if domain:
fqdn = "{0}.{1}".format(hostname, domain)
else:
fqdn = hostname
return {"hostname": hostname, "domain": domain, "fqdn": fqdn}
def verify(config):
# check for invalid host
# pattern $VAR(@) "^[[:alnum:]][-.[:alnum:]]*[[:alnum:]]$" ; "invalid host name $VAR(@)"
if not hostname_regex.match(config["hostname"]):
raise ConfigError('Invalid host name ' + config["hostname"])
# pattern $VAR(@) "^.{1,63}$" ; "invalid host-name length"
length = len(config["hostname"])
if length < 1 or length > 63:
raise ConfigError('Invalid host-name length, must be less than 63 characters')
return None
def generate(config):
# read the hosts file
with open('/etc/hosts', 'r') as f:
hosts = f.read()
# get the current hostname
old_hostname = subprocess.check_output(['hostname']).decode().strip()
# replace the local host line
hosts = re.sub(r"(127.0.1.1\s+{0}.*)".format(old_hostname), r"127.0.1.1\t{0} # VyOS entry\n".format(config["fqdn"]), hosts)
with open('/etc/hosts', 'w') as f:
f.write(hosts)
return None
def apply(config):
os.system("hostnamectl set-hostname {0}".format(config["fqdn"]))
# restart services that use the hostname
os.system("systemctl restart rsyslog.service")
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
sys.exit(1)

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