assert_content

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

# (c) 2014, Allan Denot <adenot@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: assert_content
version_added: 1.5
short_description: Check if a file contains certain content
description:
  - Check if a file contains certain content
options: 
  name: 
    description:
    - host to connect to, including port
    required: True
    default: null
  should_match: 
    description: 
    - content to match on the file, regex can be used
  required: True
author: Allan Denot
'''

EXAMPLES = '''
# Assert if testfile matches the regular expression provided
assert_content: name=/tmp/testfile should_match="example.*string"
'''

import re

def main():
    module = AnsibleModule(
        argument_spec = dict(
            name=dict(required=True, default=None),
            should_match=dict(required=True),
        ),
        supports_check_mode=True
    )
    file = module.params.get('name')
    match = module.params.get('should_match')
    
    with open(file, 'r') as content_file:
        content = content_file.read()
    
    res = re.search(match, content)

    if res:
        module.exit_json()
    
    module.fail_json(msg="Expression '%s' not found on file %s" % (match,file))
    
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()