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New module: blockinfile
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@yaegashi
yaegashi committed Oct 11, 2015
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#!/usr/bin/python
# -*- coding: utf-8 -*-

# (c) 2014, 2015 YAEGASHI Takeshi <yaegashi@debian.org>
#
# 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: blockinfile
author:
- 'YAEGASHI Takeshi (@yaegashi)'
extends_documentation_fragment:
- files
- validate
short_description: Insert/update/remove a text block
surrounded by marker lines.
version_added: '2.0'
description:
- This module will insert/update/remove a block of multi-line text
surrounded by customizable marker lines.
notes:
- This module supports check mode.
options:
dest:
aliases: [ name, destfile ]
required: true
description:
- The file to modify.
state:
required: false
choices: [ present, absent ]
default: present
description:
- Whether the block should be there or not.
marker:
required: false
default: '# {mark} ANSIBLE MANAGED BLOCK'
description:
- The marker line template.
"{mark}" will be replaced with "BEGIN" or "END".
block:
aliases: [ content ]
required: false
default: ''
description:
- The text to insert inside the marker lines.
If it's missing or an empty string,
the block will be removed as if C(state) were specified to C(absent).
insertafter:
required: false
default: EOF
description:
- If specified, the block will be inserted after the last match of
specified regular expression. A special value is available; C(EOF) for
inserting the block at the end of the file. If specified regular
expresion has no matches, C(EOF) will be used instead.
choices: [ 'EOF', '*regex*' ]
insertbefore:
required: false
default: null
description:
- If specified, the block will be inserted before the last match of
specified regular expression. A special value is available; C(BOF) for
inserting the block at the beginning of the file. If specified regular
expresion has no matches, the block will be inserted at the end of the
file.
choices: [ 'BOF', '*regex*' ]
create:
required: false
default: 'no'
choices: [ 'yes', 'no' ]
description:
- Create a new file if it doesn't exist.
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.
"""

EXAMPLES = r"""
- name: insert/update "Match User" configuation block in /etc/ssh/sshd_config
blockinfile:
dest: /etc/ssh/sshd_config
block: |
Match User ansible-agent
PasswordAuthentication no
- name: insert/update eth0 configuration stanza in /etc/network/interfaces
(it might be better to copy files into /etc/network/interfaces.d/)
blockinfile:
dest: /etc/network/interfaces
block: |
iface eth0 inet static
address 192.168.0.1
netmask 255.255.255.0
- name: insert/update HTML surrounded by custom markers after <body> line
blockinfile:
dest: /var/www/html/index.html
marker: "<!-- {mark} ANSIBLE MANAGED BLOCK -->"
insertafter: "<body>"
content: |
<h1>Welcome to {{ansible_hostname}}</h1>
<p>Last updated on {{ansible_date_time.iso8601}}</p>
- name: remove HTML as well as surrounding markers
blockinfile:
dest: /var/www/html/index.html
marker: "<!-- {mark} ANSIBLE MANAGED BLOCK -->"
content: ""
"""


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)


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']),
state=dict(default='present', choices=['absent', 'present']),
marker=dict(default='# {mark} ANSIBLE MANAGED BLOCK', type='str'),
block=dict(default='', type='str', aliases=['content']),
insertafter=dict(default=None),
insertbefore=dict(default=None),
create=dict(default=False, type='bool'),
backup=dict(default=False, type='bool'),
validate=dict(default=None, type='str'),
),
mutually_exclusive=[['insertbefore', 'insertafter']],
add_file_common_args=True,
supports_check_mode=True
)

params = module.params
dest = os.path.expanduser(params['dest'])
if module.boolean(params.get('follow', None)):
dest = os.path.realpath(dest)

if os.path.isdir(dest):
module.fail_json(rc=256,
msg='Destination %s is a directory !' % dest)

if not os.path.exists(dest):
if not module.boolean(params['create']):
module.fail_json(rc=257,
msg='Destination %s does not exist !' % dest)
original = None
lines = []
else:
f = open(dest, 'rb')
original = f.read()
f.close()
lines = original.splitlines()

insertbefore = params['insertbefore']
insertafter = params['insertafter']
block = params['block']
marker = params['marker']
present = params['state'] == 'present'

if insertbefore is None and insertafter is None:
insertafter = 'EOF'

if insertafter not in (None, 'EOF'):
insertre = re.compile(insertafter)
elif insertbefore not in (None, 'BOF'):
insertre = re.compile(insertbefore)
else:
insertre = None

marker0 = re.sub(r'{mark}', 'BEGIN', marker)
marker1 = re.sub(r'{mark}', 'END', marker)
if present and block:
# Escape seqeuences like '\n' need to be handled in Ansible 1.x
if ANSIBLE_VERSION.startswith('1.'):
block = re.sub('', block, '')
blocklines = [marker0] + block.splitlines() + [marker1]
else:
blocklines = []

n0 = n1 = None
for i, line in enumerate(lines):
if line.startswith(marker0):
n0 = i
if line.startswith(marker1):
n1 = i

if None in (n0, n1):
n0 = None
if insertre is not None:
for i, line in enumerate(lines):
if insertre.search(line):
n0 = i
if n0 is None:
n0 = len(lines)
elif insertafter is not None:
n0 += 1
elif insertbefore is not None:
n0 = 0 # insertbefore=BOF
else:
n0 = len(lines) # insertafter=EOF
elif n0 < n1:
lines[n0:n1+1] = []
else:
lines[n1:n0+1] = []
n0 = n1

lines[n0:n0] = blocklines

if lines:
result = '\n'.join(lines)+'\n'
else:
result = ''
if original == result:
msg = ''
changed = False
elif original is None:
msg = 'File created'
changed = True
elif not blocklines:
msg = 'Block removed'
changed = True
else:
msg = 'Block inserted'
changed = True

if changed and not module.check_mode:
if module.boolean(params['backup']) and os.path.exists(dest):
module.backup_local(dest)
write_changes(module, result, dest)

msg, changed = check_file_attrs(module, changed, msg)
module.exit_json(changed=changed, msg=msg)

# import module snippets
from ansible.module_utils.basic import *
from ansible.module_utils.splitter import *
if __name__ == '__main__':
main()

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