ansible/system/debconf

#!/usr/bin/python
# -*- coding: utf-8 -*-

"""
Ansible module to configure .deb packages.
(c) 2014, Brian Coca <briancoca+ansible@gmail.com>

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: debconf
short_description: Configure a .deb package
description:
     - Configure a .deb package using debconf-set-selections
version_added: "1.5"
notes:
    - A number of questions have to be answered (depending on the package).
      Use 'debconf-show <package>' on any Debian or derivative with the package
      installed to see questions/settings available.
options:
  name:
    description:
      - Name of package to configure.
    required: true
    default: null
    aliases: ['pkg']
  setting:
    description:
      - A debconf configuration setting
    required: false
    default: null
    aliases: ['question', 'selection']
  type:
    description:
      - The type of the value supplied
    required: false
    default: null
    choices: [string, boolean, select, multiselect, note, text, password, title]
    aliases: []
  value:
    description:
      -  Value to set the configuration to
    required: false
    default: null
    aliases: ['awnser']
  unseen:
    description:
      - Do not set 'seen' flag when pre-seeding
    required: false
    default: False
    aliases: []
author: Brian Coca

'''

EXAMPLES = '''
# Set default locale to fr_FR.UTF-8
debconf: name=locales setting='locales/default_environment_locale' value=fr_FR.UTF-8

# set to generate locales:
debconf: name=locales setting='locales/locales_to_be_generated  value='en_US.UTF-8 UTF-8, fr_FR.UTF-8 UTF-8'

# Accept oracle license
debconf: names='oracle-java7-installer' question='shared/accepted-oracle-license-v1-1' value='true' type='select'
'''

def get_selections(module, pkg):
    cmd = [module.get_bin_path('debconf-show', True), pkg]
    rc, out, err = module.run_command(' '.join(cmd))

    if rc == 0:
        selections = {}
    for line in out.splitlines():
            #if not line.startswith('*'): # only awnsered
            #    continue
            (key, value) = line.split(':')
            selections[ key.strip('*').strip() ] = value.strip()
        return selections
    else:
        module.fail_json(msg=err)


def set_selection(module, pkg, question, type, value, unseen):

    awnser = [ question ]
    if 'type':
        awnser.append(type)
    awnser.append(value)

    data = ' '.join(awnser)

    setsel = module.get_bin_path('debconf-set-selections', True)
    cmd = ["echo '%s %s' |" % (pkg, data), setsel]
    if unseen:
        cmd.append('-u')

    return module.run_command(' '.join(cmd))

def main():

    module = AnsibleModule(
        argument_spec = dict(
           name = dict(required=True, aliases=['pkg'], type='str'),
           setting = dict(required=False, aliases=['question', 'selection'], type='str'),
           type = dict(required=False, type='str', choices=['string', 'boolean', 'select',  'multiselect', 'note', 'text', 'password', 'title']),
           value= dict(required=False, type='str'),
           unseen = dict(required=False, type='bool'),
        ),
        supports_check_mode=True,
    )

    #TODO: enable passing array of optionas and/or debconf file from get-selections dump
    pkg      = module.params["name"]
    question = module.params["setting"]
    type     = module.params["type"]
    value    = module.params["value"]
    unseen   = module.params["unseen"]

    prev = get_selections(module, pkg)
    diff = ''

    changed = False
    msg = ""

    if question is not None:
        if not question in prev or prev[question] != value:
            changed = True

    if changed:
        if not module.check_mode:
            rc, msg, e = set_selection(module, pkg, question, type, value, unseen)
            if rc:
                module.fail_json(msg=e)

        curr = { question: value }
        if question in prev:
            prev = {question: prev[question]}
        else:
            prev[question] = ''

        module.exit_json(changed=changed, msg=msg, current=curr, previous=prev)

    module.exit_json(changed=changed, msg=msg, current=prev)

# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()