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#!/usr/bin/env python
# (c) 2014, Tomas Karasek <tomas.karasek@digile.fi>
#
# 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/>.
# Dynamic inventory script which lets you use aliases from ~/.ssh/config.
#
# There were some issues with various Paramiko versions. I took a deeper look
# and tested heavily. Now, ansible parses this alright with Paramiko versions
# 1.7.2 to 1.15.2.
#
# It prints inventory based on parsed ~/.ssh/config. You can refer to hosts
# with their alias, rather than with the IP or hostname. It takes advantage
# of the ansible_ssh_{host,port,user,private_key_file}.
#
# If you have in your .ssh/config:
# Host git
# HostName git.domain.org
# User tkarasek
# IdentityFile /home/tomk/keys/thekey
#
# You can do
# $ ansible git -m ping
#
# Example invocation:
# ssh_config.py --list
# ssh_config.py --host <alias>
import argparse
import os.path
import sys
import json
import paramiko
from ansible.module_utils.common._collections_compat import MutableSequence
SSH_CONF = '~/.ssh/config'
_key = 'ssh_config'
_ssh_to_ansible = [('user', 'ansible_ssh_user'),
('hostname', 'ansible_ssh_host'),
('identityfile', 'ansible_ssh_private_key_file'),
('port', 'ansible_ssh_port')]
def get_config():
if not os.path.isfile(os.path.expanduser(SSH_CONF)):
return {}
with open(os.path.expanduser(SSH_CONF)) as f:
cfg = paramiko.SSHConfig()
cfg.parse(f)
ret_dict = {}
for d in cfg._config:
if isinstance(d['host'], MutableSequence):
alias = d['host'][0]
else:
alias = d['host']
if ('?' in alias) or ('*' in alias):
continue
_copy = dict(d)
del _copy['host']
if 'config' in _copy:
ret_dict[alias] = _copy['config']
else:
ret_dict[alias] = _copy
return ret_dict
def print_list():
cfg = get_config()
meta = {'hostvars': {}}
for alias, attributes in cfg.items():
tmp_dict = {}
for ssh_opt, ans_opt in _ssh_to_ansible:
if ssh_opt in attributes:
# If the attribute is a list, just take the first element.
# Private key is returned in a list for some reason.
attr = attributes[ssh_opt]
if isinstance(attr, MutableSequence):
attr = attr[0]
tmp_dict[ans_opt] = attr
if tmp_dict:
meta['hostvars'][alias] = tmp_dict
print(json.dumps({_key: list(set(meta['hostvars'].keys())), '_meta': meta}))
def print_host(host):
cfg = get_config()
print(json.dumps(cfg[host]))
def get_args(args_list):
parser = argparse.ArgumentParser(
description='ansible inventory script parsing .ssh/config')
mutex_group = parser.add_mutually_exclusive_group(required=True)
help_list = 'list all hosts from .ssh/config inventory'
mutex_group.add_argument('--list', action='store_true', help=help_list)
help_host = 'display variables for a host'
mutex_group.add_argument('--host', help=help_host)
return parser.parse_args(args_list)
def main(args_list):
args = get_args(args_list)
if args.list:
print_list()
if args.host:
print_host(args.host)
if __name__ == '__main__':
main(sys.argv[1:])
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