Remove the 'host' module for now because the alias handling involves a bit too…

Remove the 'host' module for now because the alias handling involves a bit too much automagic.  Proposal is to come up with a spec
of how it should work and accept to spec, using the existing patch (cherry-picked) as a baseline.

CHANGELOG.md

@@ -38,7 +38,6 @@ New modules and plugins.
 * files: unarchive: pushes and extracts tarballs
 * files: synchronize: a useful wraper around rsyncing trees of files
 * system: firewalld -- manage the firewalld configuration
-* system: host -- manage `/etc/hosts` file entries
 * system: modprobe -- manage kernel modules on systems that support modprobe/rmmod
 * system: open_iscsi -- manage targets on an initiator using open-iscsi
 * system: blacklist: add or remove modules from the kernel blacklist

library/system/host

-#!/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
-version_added: "1.4"
-short_description: Add, update or remove entries in C(/etc/hosts).
-requirements:
-description:
-    - Manage entries in C(/etc/hosts).
-options:
-    ip:
-        required: false
-        description:
-            - IP address. Required if C(state=present).
-    hostname:
-        required: false
-        description:
-            - 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:
-            - 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
-- 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']
-
-        self._ip_matches        = False
-        self._hostname_matches  = False
-        self._aliases_matches   = 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')
-        self._hostsfile_lines = f.readlines()
-        f.close()
-
-        for lineno, line in enumerate(self._hostsfile_lines):
-            if line.startswith("#") or line.startswith("\n"):
-                continue
-
-            ip = line.split()[0:1]
-            hostname = line.split()[1:2]
-            aliases = ','.join(line.split()[2:])
-
-            if self.ip and self.ip in ip: 
-                self._ip_matches = True
-                self._found_on_line = lineno
-
-            if self.hostname and self.hostname in hostname:
-                self._hostname_matches = True
-                self._found_on_line = lineno
-
-            # only look at aliases if we found hostname or ip
-            if self._hostname_matches or self._ip_matches:
-                if self.aliases == aliases:
-                    self._aliases_matches = True
-                break
-
-    def full_entry_exists(self):
-        return self._ip_matches and self._hostname_matches and self._aliases_matches
-
-    def entry_exists(self):
-        return self._ip_matches or self._hostname_matches
-
-    def remove_entry(self):
-        self._hostsfile_lines.pop(self._found_on_line)
-
-    def add_entry(self):
-        aliases = ''
-        if self.aliases:
-            aliases = self.aliases.replace(',',' ')
-        host_entry = self.ip + " " + self.hostname + " " + aliases + "\n"
-        if self.entry_exists():
-            self._hostsfile_lines[self._found_on_line] = host_entry
-        else:
-            self._hostsfile_lines.extend(host_entry)
-
-    def write_changes(self):
-        tmpfd, tmpfile = tempfile.mkstemp()
-        f = os.fdopen(tmpfd,'wb')
-        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='', type='str'),
-        ),
-        supports_check_mode=True
-    )
-
-    result = {}
-    host = Host(module)
-    result['state'] = host.state
-    result['changed'] = False
-
-    result['msg'] = host.validate_has_hostname_on_present()
-    if result['msg']:
-        module.fail_json(**result)
-
-    result['msg'] = host.validate_has_ip_or_hostname_on_absent()
-    if result['msg']:
-        module.fail_json(**result)
-
-    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()
-            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()
-            result['changed'] = True
-
-    module.exit_json(**result)
-
-# include magic from lib/ansible/module_common.py
-#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
-main()