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#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2013, Evan Kaufman <evan@digitalflophouse.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/>.
import re
import os
import tempfile
DOCUMENTATION = """
---
module: replace
author: "Evan Kaufman (@EvanK)"
extends_documentation_fragment:
- files
- validate
short_description: Replace all instances of a particular string in a
file using a back-referenced regular expression.
description:
- This module will replace all instances of a pattern within a file.
- It is up to the user to maintain idempotence by ensuring that the
same pattern would never match any replacements made.
version_added: "1.6"
options:
dest:
required: true
aliases: [ name, destfile ]
description:
- The file to modify.
regexp:
required: true
description:
- The regular expression to look for in the contents of the file.
Uses Python regular expressions; see
U(http://docs.python.org/2/library/re.html).
Uses multiline mode, which means C(^) and C($) match the beginning
and end respectively of I(each line) of the file.
replace:
required: false
description:
- The string to replace regexp matches. May contain backreferences
that will get expanded with the regexp capture groups if the regexp
matches. If not set, matches are removed entirely.
backup:
required: false
default: "no"
choices: [ "yes", "no" ]
description:
- Create a backup file including the timestamp information so you can
get the original file back if you somehow clobbered it incorrectly.
others:
description:
- All arguments accepted by the M(file) module also work here.
required: false
follow:
required: false
default: "no"
choices: [ "yes", "no" ]
version_added: "1.9"
description:
- 'This flag indicates that filesystem links, if they exist, should be followed.'
"""
EXAMPLES = r"""
- replace:
dest: /etc/hosts
regexp: '(\s+)old\.host\.name(\s+.*)?$'
replace: '\1new.host.name\2'
backup: yes
- replace:
dest: /home/jdoe/.ssh/known_hosts
regexp: '^old\.host\.name[^\n]*\n'
owner: jdoe
group: jdoe
mode: 0644
- replace:
dest: /etc/apache/ports
regexp: '^(NameVirtualHost|Listen)\s+80\s*$'
replace: '\1 127.0.0.1:8080'
validate: '/usr/sbin/apache2ctl -f %s -t'
"""
def write_changes(module,contents,dest):
tmpfd, tmpfile = tempfile.mkstemp()
f = os.fdopen(tmpfd,'wb')
f.write(contents)
f.close()
validate = module.params.get('validate', None)
valid = not validate
if validate:
if "%s" not in validate:
module.fail_json(msg="validate must contain %%s: %s" % (validate))
(rc, out, err) = module.run_command(validate % tmpfile)
valid = rc == 0
if rc != 0:
module.fail_json(msg='failed to validate: '
'rc:%s error:%s' % (rc,err))
if valid:
module.atomic_move(tmpfile, dest, unsafe_writes=module.params['unsafe_writes'])
def check_file_attrs(module, changed, message):
file_args = module.load_file_common_arguments(module.params)
if module.set_file_attributes_if_different(file_args, False):
if changed:
message += " and "
changed = True
message += "ownership, perms or SE linux context changed"
return message, changed
def main():
module = AnsibleModule(
argument_spec=dict(
dest=dict(required=True, aliases=['name', 'destfile']),
regexp=dict(required=True),
replace=dict(default='', type='str'),
backup=dict(default=False, type='bool'),
validate=dict(default=None, type='str'),
),
add_file_common_args=True,
supports_check_mode=True
)
params = module.params
dest = os.path.expanduser(params['dest'])
res_args = dict()
if os.path.isdir(dest):
module.fail_json(rc=256, msg='Destination %s is a directory !' % dest)
if not os.path.exists(dest):
module.fail_json(rc=257, msg='Destination %s does not exist !' % dest)
else:
f = open(dest, 'rb')
contents = f.read()
f.close()
mre = re.compile(params['regexp'], re.MULTILINE)
result = re.subn(mre, params['replace'], contents, 0)
if result[1] > 0 and contents != result[0]:
msg = '%s replacements made' % result[1]
changed = True
if module._diff:
res_args['diff'] = {
'before_header': dest,
'before': contents,
'after_header': dest,
'after': result[0],
}
else:
msg = ''
changed = False
if changed and not module.check_mode:
if params['backup'] and os.path.exists(dest):
res_args['backup_file'] = module.backup_local(dest)
if params['follow'] and os.path.islink(dest):
dest = os.path.realpath(dest)
write_changes(module, result[0], dest)
res_args['msg'], res_args['changed'] = check_file_attrs(module, changed, msg)
module.exit_json(**res_args)
# this is magic, see lib/ansible/module_common.py
from ansible.module_utils.basic import *
if __name__ == '__main__':
main()
|
