From 7b7c6c38bcc2ad23d096007f0268247a444a6db8 Mon Sep 17 00:00:00 2001
From: Tomas Karasek <tomas.karasek@digile.fi>
Date: Thu, 13 Feb 2014 16:33:25 +0200
Subject: [PATCH] Added inventory plugin for hosts from ~/.ssh/config

---
 plugins/inventory/ssh_config.py | 110 ++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100755 plugins/inventory/ssh_config.py

diff --git a/plugins/inventory/ssh_config.py b/plugins/inventory/ssh_config.py
new file mode 100755
index 00000000000..24017e62282
--- /dev/null
+++ b/plugins/inventory/ssh_config.py
@@ -0,0 +1,110 @@
+#!/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.
+#
+# 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 paramiko
+
+try:
+    import json
+except ImportError:
+    import simplejson as json
+
+_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():
+    with open(os.path.expanduser('~/.ssh/config')) as f:
+        cfg = paramiko.SSHConfig()
+        cfg.parse(f)
+        ret_dict = {}
+        for d in cfg._config:
+            _copy = dict(d)
+            del _copy['host']
+            ret_dict[d['host']] = _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:
+                tmp_dict[ans_opt] = attributes[ssh_opt]
+        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:])