ansible/library/system/host

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#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# (c) 2013, René Moser <mail@renemoser.net>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible 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 Ansible. If not, see <http://www.gnu.org/licenses/>.
DOCUMENTATION = '''
---
module: host
author: René Moser
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version_added: "1.4"
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short_description: Add, update or remove entries in C(/etc/hosts).
requirements:
description:
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- Manage entries in C(/etc/hosts).
options:
ip:
required: false
description:
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- IP address. Required if C(state=present).
hostname:
required: false
description:
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- name of host. Required if C(state=present).
aliases:
required: false
description:
- list of alias hostnames, comma separated.
state:
required: false
default: "present"
choices: [ present, absent ]
description:
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- Whether the entries should be present or not in C(/etc/hosts).
'''
EXAMPLES = '''
# Example host command from Ansible Playbooks
- host: ip=127.0.0.1 hostname=localhost state=present
- host: ip=127.0.0.1 hostname=localhost aliases=foobar.com,localhost.foobar.com
- host: ip=192.168.1.1 state=absent
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- host: hostname=www.example.com state=absent
- host: ip=::1 hostname=localhost6 aliases=ip6-localhost,ip6-loopback
'''
import os
import tempfile
import fileinput
class Host(object):
HOSTSFILE = '/etc/hosts'
def __init__(self, module):
self.module = module
self.state = module.params['state']
self.ip = module.params['ip']
self.hostname = module.params['hostname']
self.aliases = module.params['aliases']
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self._ip_matches = False
self._hostname_matches = False
self._aliases_matches = False
self._has_aliases = False
self._found_on_line = -1
def validate_has_hostname_on_present(self):
err = ''
if self.state == 'present' and not (self.hostname and self.ip):
err = "Error: No param 'hostnames' or 'ip' given in state 'present'."
return err
def validate_has_ip_or_hostname_on_absent(self):
err = ''
if self.state == 'absent':
if not (self.hostname or self.ip):
err = "Error: Either param 'hostnames' or 'ip' must be given in state 'absent'."
if self.hostname and self.ip:
err = "Error: Either param 'hostnames' or 'ip' must be given in state 'absent'."
return err
def proceed_hosts_entries(self):
f = open(self.HOSTSFILE,'rb')
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self._hostsfile_lines = f.readlines()
f.close()
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for lineno, line in enumerate(self._hostsfile_lines):
if line.startswith("#"):
continue
ip = line.split()[0:1]
hostname = line.split()[1:2]
aliases = ','.join(line.split()[2:])
if self.ip and self.ip in ip:
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self._ip_matches = True
self._found_on_line = lineno
if self.hostname and self.hostname in hostname:
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self._hostname_matches = True
self._found_on_line = lineno
# only look at aliases if we found hostname or ip
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if self._hostname_matches or self._ip_matches:
if aliases:
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self._has_aliases = True
if self.aliases and self.aliases == aliases:
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self._aliases_matches = True
break
def full_entry_exists(self):
if self.aliases and not self._aliases_matches:
return False
return self._ip_matches and self._hostname_matches
def entry_exists(self):
return self._ip_matches or self._hostname_matches
def remove_entry(self):
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self._hostsfile_lines.pop(self._found_on_line)
def add_entry(self):
aliases = ''
if self.aliases:
aliases = self.aliases.replace(',',' ')
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host_entry = self.ip + " " + self.hostname + " " + aliases + "\n"
if self.entry_exists():
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self._hostsfile_lines[self._found_on_line] = host_entry
else:
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self._hostsfile_lines.extend(host_entry)
def write_changes(self):
tmpfd, tmpfile = tempfile.mkstemp()
f = os.fdopen(tmpfd,'wb')
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f.writelines(self._hostsfile_lines)
f.close()
self.module.atomic_move(tmpfile, self.HOSTSFILE)
def main():
module = AnsibleModule(
argument_spec = dict(
state=dict(default='present', choices=['present', 'absent'], type='str'),
ip=dict(default=None, type='str'),
hostname=dict(default=None, type='str'),
aliases=dict(default=None, type='str'),
),
supports_check_mode=True
)
result = {}
host = Host(module)
result['state'] = host.state
result['changed'] = False
err = host.validate_has_hostname_on_present()
if err:
module.fail_json(msg=err)
err = host.validate_has_ip_or_hostname_on_absent()
if err:
module.fail_json(msg=err)
host.proceed_hosts_entries()
if host.state == 'present':
if not host.full_entry_exists():
if module.check_mode:
module.exit_json(changed=True)
host.add_entry()
host.write_changes()
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result['changed'] = True
elif host.state == 'absent':
if host.entry_exists():
if module.check_mode:
module.exit_json(changed=True)
host.remove_entry()
host.write_changes()
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result['changed'] = True
module.exit_json(**result)
# include magic from lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()