# Copyright 2014 DreamHost, LLC
#
# Author: DreamHost, LLC
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.


from astara_router.drivers import base
from astara_router import utils


class HostnameManager(base.Manager):
    EXECUTABLE = 'hostname'

    def update(self, config):
        self.update_hostname(config)
        self.update_hosts(config)

    def update_hostname(self, config):
        self.sudo(config.hostname)
        utils.replace_file('/tmp/hostname', config.hostname)
        utils.execute(
            ['mv', '/tmp/hostname', '/etc/hostname'], self.root_helper
        )

    def update_hosts(self, config):
        mgt_addr = config.management_address

        if not mgt_addr:
            return

        config_data = [
            '127.0.0.1  localhost',
            '::1  localhost ip6-localhost ip6-loopback',
            '%s  %s' % (mgt_addr, config.hostname)
        ]
        utils.replace_file('/tmp/hosts', '\n'.join(config_data))
        utils.execute(['mv', '/tmp/hosts', '/etc/hosts'], self.root_helper)