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system_lcd.py
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system_lcd.py
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#!/usr/bin/env python3
#
# Copyright 2020 VyOS maintainers and contributors <maintainers@vyos.io>
#
# 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
from sys import exit
from vyos.config import Config
from vyos.util import call
from vyos.util import find_device_file
from vyos.template import render
from vyos import ConfigError
from vyos import airbag
airbag.enable()
lcdd_conf = '/run/LCDd/LCDd.conf'
lcdproc_conf = '/run/lcdproc/lcdproc.conf'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['system', 'lcd']
lcd = conf.get_config_dict(base, key_mangling=('-', '_'),
get_first_key=True)
# Return (possibly empty) dictionary
return lcd
def verify(lcd):
if not lcd:
return None
if 'model' in lcd and lcd['model'] in ['sdec']:
# This is a fixed LCD display, no device needed - bail out early
return None
if not {'device', 'model'} <= set(lcd):
raise ConfigError('Both device and driver must be set!')
return None
def generate(lcd):
if not lcd:
return None
if 'device' in lcd:
lcd['device'] = find_device_file(lcd['device'])
# Render config file for daemon LCDd
render(lcdd_conf, 'lcd/LCDd.conf.tmpl', lcd, trim_blocks=True)
# Render config file for client lcdproc
render(lcdproc_conf, 'lcd/lcdproc.conf.tmpl', lcd, trim_blocks=True)
return None
def apply(lcd):
if not lcd:
call('systemctl stop lcdproc.service LCDd.service')
for file in [lcdd_conf, lcdproc_conf]:
if os.path.exists(file):
os.remove(file)
else:
# Restart server
call('systemctl restart LCDd.service lcdproc.service')
return None
if __name__ == '__main__':
try:
config_dict = get_config()
verify(config_dict)
generate(config_dict)
apply(config_dict)
except ConfigError as e:
print(e)
exit(1)

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