ansible/library/lineinfile

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2012, Daniel Hokka Zakrisson <daniel@hozac.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
DOCUMENTATION = '''
---
module: lineinfile
author: Daniel Hokka Zakrisson
short_description: Ensure a particular line is in a file
description:
- This module will search a file for a line, and ensure that it is present or absent.
- This is primarily useful when you want to change a single line in a
file only. For other cases, see the M(copy) or M(template) modules.
version_added: "0.7"
options:
dest:
required: true
aliases: [ name, destfile ]
description:
- The file to modify
regexp:
required: true
description:
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- The regular expression to look for in the file. For C(state=present),
the pattern to replace. For C(state=absent), the pattern of the line
to remove.
state:
required: false
choices: [ present, absent ]
default: "present"
aliases: []
description:
- Whether the line should be there or not.
line:
required: false
description:
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- Required for C(state=present). The line to insert/replace into the
file. Must match the value given to C(regexp).
insertafter:
required: false
default: EOF
description:
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- Used with C(state=present). If specified, the line will be inserted
after the specified regular expression. Two special values are
available; C(BOF) for inserting the line at the beginning of the
file, and C(EOF) for inserting the line at the end of the file.
choices: [ BOF, EOF ]
default: EOF
backup:
required: false
default: 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:
- code: lineinfile dest=/etc/selinux/config regexp=^SELINUX= line=SELINUX=disabled
- code: lineinfile dest=/etc/sudoers state=absent regexp="^%wheel"
'''
def present(module, dest, regexp, line, insertafter, backup):
f = open(dest, 'rb')
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lines = f.readlines()
f.close()
mre = re.compile(regexp)
if not mre.search(line):
module.fail_json(msg="usage error: line= doesn't match regexp (%s)" % regexp)
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if insertafter in ('BOF', 'EOF'):
iare = None
else:
iare = re.compile(insertafter)
index = [-1, -1]
for lineno in range(0, len(lines)):
if mre.search(lines[lineno]):
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index[0] = lineno
elif iare is not None and iare.search(lines[lineno]):
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# + 1 for the next line
index[1] = lineno + 1
# Regexp matched a line in the file
if index[0] != -1:
if lines[index[0]] == line + os.linesep:
msg = ''
changed = False
else:
lines[index[0]] = line + os.linesep
msg = 'line replaced'
changed = True
# Add it to the beginning of the file
elif insertafter == 'BOF':
lines.insert(0, line + os.linesep)
msg = 'line added'
changed = True
# Add it to the end of the file if requested or if insertafter= didn't match
elif insertafter == 'EOF' or index[1] == -1:
lines.append(line + os.linesep)
msg = 'line added'
changed = True
# insertafter= matched
else:
lines.insert(index[1], line + os.linesep)
msg = 'line added'
changed = True
if changed:
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if backup:
module.backup_local(dest)
f = open(dest, 'wb')
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f.writelines(lines)
f.close()
module.exit_json(changed=changed, msg=msg)
def absent(module, dest, regexp, backup):
f = open(dest, 'rb')
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lines = f.readlines()
f.close()
cre = re.compile(regexp)
found = []
def matcher(line):
if cre.search(line):
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found.append(line)
return False
else:
return True
lines = filter(matcher, lines)
changed = len(found) > 0
if changed:
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if backup:
module.backup_local(dest)
f = open(dest, 'wb')
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f.writelines(lines)
f.close()
module.exit_json(changed=changed, found=len(found))
def main():
module = AnsibleModule(
argument_spec = dict(
dest=dict(required=True, aliases=['name', 'destfile']),
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state=dict(default='present', choices=['absent', 'present']),
regexp=dict(required=True),
line=dict(aliases=['value']),
insertafter=dict(default='EOF'),
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backup=dict(default=False, choices=BOOLEANS),
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),
)
params = module.params
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backup = module.boolean(module.params.get('backup', False))
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if params['state'] == 'present':
if 'line' not in params:
module.fail_json(msg='line= is required with state=present')
present(module, params['dest'], params['regexp'], params['line'],
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params['insertafter'], backup)
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else:
absent(module, params['dest'], params['regexp'], backup)
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# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()