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community.general/lib/ansible/modules/files/blockinfile.py
Dag Wieers 1ad55ec9de Consistent path attribute for file-related modules 
Not all file-related modules consistently use "path" as the attribute to specify a single filename, some use "dest", others use "name". Most do have aliases for either "name" or "destfile".

This change makes "path" the default attribute for (single) file-related modules, but also adds "dest" and "name" as aliases, so that people can use a consistent way of attributing paths, but also to ensure backward compatibility with existing playbooks.

NOTE: The reason for changing this, is that it makes Ansible needlessly harder to use if you have to remember that e.g. the xattr module requires the name attribute, the lineinfile module requires a dest attribute, and the stat module requires a path attribute.
2017-01-13 15:49:42 -05:00

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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/>.
ANSIBLE_METADATA = {'status': ['preview'],
'supported_by': 'core',
'version': '1.0'}
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.
options:
path:
aliases: [ dest, destfile, name ]
required: true
description:
- The file to modify.
- Before 2.3 this option was only usable as I(dest), I(destfile) and I(name).
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: None
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.
follow:
required: false
default: "no"
choices: [ "yes", "no" ]
description:
- 'This flag indicates that filesystem links, if they exist, should be followed.'
version_added: "2.1"
notes:
- This module supports check mode.
- When using 'with_*' loops be aware that if you do not set a unique mark the block will be overwritten on each iteration.
- As of Ansible 2.3, the I(dest) option has been changed to I(path) as default, but I(dest) still works as well.
"""
EXAMPLES = r"""
# Before 2.3, option 'dest' or 'name' was used instead of 'path'
- name: insert/update "Match User" configuration block in /etc/ssh/sshd_config
blockinfile:
path: /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:
path: /etc/network/interfaces
block: |
iface eth0 inet static
address 192.0.2.23
netmask 255.255.255.0
- name: insert/update HTML surrounded by custom markers after <body> line
blockinfile:
path: /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:
path: /var/www/html/index.html
marker: "<!-- {mark} ANSIBLE MANAGED BLOCK -->"
content: ""
- name: Add mappings to /etc/hosts
blockinfile:
path: /etc/hosts
block: |
{{ item.ip }} {{ item.name }}
marker: "# {mark} ANSIBLE MANAGED BLOCK {{ item.name }}"
with_items:
- { name: host1, ip: 10.10.1.10 }
- { name: host2, ip: 10.10.1.11 }
- { name: host3, ip: 10.10.1.12 }
"""
import re
import os
import tempfile
from ansible.module_utils.six import b
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils._text import to_bytes
def write_changes(module, contents, path):
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, path, 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(
path=dict(required=True, aliases=['dest', 'destfile', 'name'], type='path'),
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
path = params['path']
if module.boolean(params.get('follow', None)):
path = os.path.realpath(path)
if os.path.isdir(path):
module.fail_json(rc=256,
msg='Path %s is a directory !' % path)
path_exists = os.path.exists(path)
if not path_exists:
if not module.boolean(params['create']):
module.fail_json(rc=257,
msg='Path %s does not exist !' % path)
original = None
lines = []
else:
f = open(path, 'rb')
original = f.read()
f.close()
lines = original.splitlines()
insertbefore = params['insertbefore']
insertafter = params['insertafter']
block = to_bytes(params['block'])
marker = to_bytes(params['marker'])
present = params['state'] == 'present'
if not present and not path_exists:
module.exit_json(changed=False, msg="File %s not present" % path)
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(b(r'{mark}'), b('BEGIN'), marker)
marker1 = re.sub(b(r'{mark}'), b('END'), marker)
if present and block:
# Escape seqeuences like '\n' need to be handled in Ansible 1.x
if module.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 == marker0:
n0 = i
if line == 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 = b('\n').join(lines)
if original is None or original.endswith(b('\n')):
result += b('\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 path_exists:
module.backup_local(path)
write_changes(module, result, path)
if module.check_mode and not path_exists:
module.exit_json(changed=changed, msg=msg)
msg, changed = check_file_attrs(module, changed, msg)
module.exit_json(changed=changed, msg=msg)
if __name__ == '__main__':
main()
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