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ansible/library/lineinfile
tin ca581840ef Added additional lineinfile documentation. 
A little more unit testing.
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, or replace an
existing line using a back-referenced regular expression.
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 every line of the file. For
C(state=present), the pattern to replace if found; only the last line
found will be replaced. 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. If backrefs is set, may contain backreferences that will get
expanded with the regexp capture groups if the regexp matches. The
backreferences should be double escaped (see examples).
backrefs:
required: false
default: "no"
choices: [ "yes", "no" ]
version_added: 1.1
description:
- Used with C(state=present). If set, line can contain backreferences
(both positional and named) that will get populated if the regexp
matches. This flag changes the operation of the module slightly;
insertbefore) and insertafter will be ignored, and if the regexp
doesn't match anywhere in the file, the file will be left unchanged.
If the regexp does match, the last matching line will be replaced by
the expanded line parameter.
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.
May not be used with backrefs.
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.
May not be used with backrefs.
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 = r"""
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=/opt/jboss-as/bin/standalone.conf state=present regexp='^(.*)Xms(\d+)m(.*)$' line='\\1Xms${xms}m\\3'
"""
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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