#!/usr/bin/python # -*- coding: utf-8 -*- # (c) 2013, Evan Kaufman . import re import os import tempfile DOCUMENTATION = """ --- module: replace author: Evan Kaufman short_description: Replace all instances of a particular string in a file using a back-referenced regular expression. description: - This module will replace all instances of a pattern within a file. - It is up to the user to maintain idempotence by ensuring that the same pattern would never match any replacements made. version_added: "1.6" options: dest: required: true aliases: [ name, destfile ] description: - The file to modify. regexp: required: true description: - The regular expression to look for in the contents of the file. Uses Python regular expressions; see U(http://docs.python.org/2/library/re.html). Uses multiline mode, which means C(^) and C($) match the beginning and end respectively of I(each line) of the file. replace: required: false description: - The string to replace regexp matches. May contain backreferences that will get expanded with the regexp capture groups if the regexp matches. If not set, matches are removed entirely. backup: required: false default: "no" choices: [ "yes", "no" ] description: - Create a backup file including the timestamp information so you can get the original file back if you somehow clobbered it incorrectly. validate: required: false description: - validation to run before copying into place required: false default: None others: description: - All arguments accepted by the M(file) module also work here. required: false """ EXAMPLES = r""" - replace: dest=/etc/hosts regexp='(\s+)old\.host\.name(\s+.*)?$' replace='\1new.host.name\2' backup=yes - replace: dest=/home/jdoe/.ssh/known_hosts regexp='^old\.host\.name[^\n]*\n' owner=jdoe group=jdoe mode=644 - replace: dest=/etc/apache/ports regexp='^(NameVirtualHost|Listen)\s+80\s*$' replace='\1 127.0.0.1:8080' validate='/usr/sbin/apache2ctl -f %s -t' """ def write_changes(module,contents,dest): 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, 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 main(): module = AnsibleModule( argument_spec=dict( dest=dict(required=True, aliases=['name', 'destfile']), regexp=dict(required=True), replace=dict(default='', type='str'), backup=dict(default=False, type='bool'), validate=dict(default=None, type='str'), ), add_file_common_args=True, supports_check_mode=True ) params = module.params dest = os.path.expanduser(params['dest']) if os.path.isdir(dest): module.fail_json(rc=256, msg='Destination %s is a directory !' % dest) if not os.path.exists(dest): module.fail_json(rc=257, msg='Destination %s does not exist !' % dest) else: f = open(dest, 'rb') contents = f.read() f.close() mre = re.compile(params['regexp'], re.MULTILINE) result = re.subn(mre, params['replace'], contents, 0) if result[1] > 0 and contents != result[0]: msg = '%s replacements made' % result[1] changed = True else: msg = '' changed = False if changed and not module.check_mode: if params['backup'] and os.path.exists(dest): module.backup_local(dest) write_changes(module, result[0], dest) msg, changed = check_file_attrs(module, changed, msg) module.exit_json(changed=changed, msg=msg) # this is magic, see lib/ansible/module_common.py #<> main()