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ansible/library/lineinfile
tin f9b70822d2 Fixed to the lineinfile module. 
Added the backrefs parameter to the lineinfile module.
Added tests for the backrefs functionality of the lineinfile module.
2013-03-27 01:31:58 +01:00

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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:
- 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. Uses Python regular expressions; see
U(http://docs.python.org/2/library/re.html).
state:
required: false
choices: [ present, absent ]
default: "present"
aliases: []
description:
- Whether the line should be there or not.
line:
required: false
description:
- Required for C(state=present). The line to insert/replace into the
file. May contain backreferences.
insertafter:
required: false
default: EOF
description:
- Used with C(state=present). If specified, the line will be inserted
after the specified regular expression. A special value is
available; C(EOF) for inserting the line at the end of the file.
choices: [ 'EOF', '*regex*' ]
insertbefore:
required: false
version_added: 1.1
description:
- Used with C(state=present). If specified, the line will be inserted
before the specified regular expression. A value is available;
C(BOF) for inserting the line at the beginning of the
file.
choices: [ 'BOF', '*regex*' ]
create:
required: false
choices: [ "yes", "no" ]
default: "no"
description:
- Used with C(state=present). If specified, the file will be created
if it does not already exist. By default it will fail if the file
is missing.
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
"""
EXAMPLES = """
lineinfile: dest=/etc/selinux/config regexp=^SELINUX= line=SELINUX=disabled
lineinfile: dest=/etc/sudoers state=absent regexp="^%wheel"
lineinfile: dest=/etc/host regexp='^127\.0\.0\.1' line='127.0.0.1 localhost' owner=root group=root mode=0644
lineinfile: dest=/etc/httpd/conf/httpd.conf regexp="^Listen " insertafter="^#Listen " line="Listen 8080"
lineinfile: dest=/etc/services regexp="^# port for http" insertbefore="^www.*80/tcp" line="# port for http by default"
lineinfile: \\\"dest=/etc/sudoers state=present regexp='^%wheel' line ='%wheel ALL=(ALL) NOPASSWD: ALL'\\\"
lineinfile dest=/tmp/grub.conf state=present regexp='^(splashimage=.*)$' line="#\\1"
"""
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 present(module, dest, regexp, line, insertafter, insertbefore, create,
backup, backrefs):
if os.path.isdir(dest):
module.fail_json(rc=256, msg='Destination %s is a directory !' % dest)
elif not os.path.exists(dest):
if not create:
module.fail_json(rc=257, msg='Destination %s does not exist !' % dest)
destpath = os.path.dirname(dest)
if not os.path.exists(destpath):
os.makedirs(destpath)
lines = []
else:
f = open(dest, 'rb')
lines = f.readlines()
f.close()
msg = ""
mre = re.compile(regexp)
if insertafter not in (None, 'BOF', 'EOF'):
insre = re.compile(insertafter)
elif insertbefore not in (None, 'BOF'):
insre = re.compile(insertbefore)
else:
insre = None
# index[0] is the line num where regexp has been found
# index[1] is the line num where insertafter/inserbefore has been found
index = [-1, -1]
m = None
for lineno, cur_line in enumerate(lines):
match_found = mre.search(cur_line)
if match_found:
index[0] = lineno
m = match_found
elif insre is not None and insre.search(cur_line):
if insertafter:
# + 1 for the next line
index[1] = lineno + 1
if insertbefore:
# + 1 for the previous line
index[1] = lineno
msg = ''
changed = False
# Regexp matched a line in the file
if index[0] != -1:
if backrefs:
new_line = m.expand(line)
else:
# Don't do backref expansion if not asked.
new_line = line
if lines[index[0]] != new_line + os.linesep:
lines[index[0]] = new_line + os.linesep
msg = 'line replaced'
changed = True
elif backrefs:
# Do absolutely nothing, since it's not safe generating the line
# without the regexp matching to populate the backrefs.
pass
# Add it to the beginning of the file
elif insertbefore == 'BOF' or 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=/insertbefore didn't match anything
# (so default behaviour is to add at the end)
elif insertafter == 'EOF':
lines.append(line + os.linesep)
msg = 'line added'
changed = True
# Do nothing if insert* didn't match
elif index[1] == -1:
pass
# insert* matched, but not the regexp
else:
lines.insert(index[1], line + os.linesep)
msg = 'line added'
changed = True
if changed and not module.check_mode:
if backup and os.path.exists(dest):
module.backup_local(dest)
f = open(dest, 'wb')
f.writelines(lines)
f.close()
msg, changed = check_file_attrs(module, changed, msg)
module.exit_json(changed=changed, msg=msg)
def absent(module, dest, regexp, backup):
if os.path.isdir(dest):
module.fail_json(rc=256, msg='Destination %s is a directory !' % dest)
elif not os.path.exists(dest):
module.exit_json(changed=False, msg="file not present")
msg = ""
f = open(dest, 'rb')
lines = f.readlines()
f.close()
cre = re.compile(regexp)
found = []
def matcher(line):
if cre.search(line):
found.append(line)
return False
else:
return True
lines = filter(matcher, lines)
changed = len(found) > 0
if changed and not module.check_mode:
if backup:
module.backup_local(dest)
f = open(dest, 'wb')
f.writelines(lines)
f.close()
if changed:
msg = "%s line(s) removed" % len(found)
msg, changed = check_file_attrs(module, changed, msg)
module.exit_json(changed=changed, found=len(found), msg=msg)
def main():
module = AnsibleModule(
argument_spec=dict(
dest=dict(required=True, aliases=['name', 'destfile']),
state=dict(default='present', choices=['absent', 'present']),
regexp=dict(required=True),
line=dict(aliases=['value']),
insertafter=dict(default=None),
insertbefore=dict(default=None),
backrefs=dict(default=False, type='bool'),
create=dict(default=False, type='bool'),
backup=dict(default=False, type='bool'),
),
mutually_exclusive=[['insertbefore', 'insertafter']],
add_file_common_args=True,
supports_check_mode=True
)
params = module.params
create = module.params['create']
backup = module.params['backup']
backrefs = module.params['backrefs']
dest = os.path.expanduser(params['dest'])
if params['state'] == 'present':
if 'line' not in params:
module.fail_json(msg='line= is required with state=present')
# Deal with the insertafter default value manually, to avoid errors
# because of the mutually_exclusive mechanism.
ins_bef, ins_aft = params['insertbefore'], params['insertafter']
if ins_bef is None and ins_aft is None:
ins_aft = 'EOF'
present(module, dest, params['regexp'], params['line'],
ins_aft, ins_bef, create, backup, backrefs)
else:
absent(module, dest, params['regexp'], backup)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()
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