#!/usr/bin/python # -*- coding: utf-8 -*- # (c) 2012, Daniel Hokka Zakrisson # # 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 . import re import os import tempfile 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 regexp='^(.*)Xms(\d+)m(.*)$' line='\\1Xms${xms}m\\3' backrefs=yes """ def write_changes(module,lines,dest): tmpfd, tmpfile = tempfile.mkstemp() f = os.fdopen(tmpfd,'wb') f.writelines(lines) f.close() 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 present(module, dest, regexp, line, insertafter, insertbefore, create, backup, backrefs): if 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) write_changes(module, lines, dest) msg, changed = check_file_attrs(module, changed, msg) module.exit_json(changed=changed, msg=msg) def absent(module, dest, regexp, backup): if 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) write_changes(module, lines, dest) 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 os.path.isdir(dest): module.fail_json(rc=256, msg='Destination %s is a directory !' % 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 #<> main()