Add openshift inventory plugin

This plugin will list all your git repositories from a openshift
provider, and allow you to manage them using ansible.

The inventory either use a environement variable or reuse the
existing rhc configuration file if it exist.

plugins/inventory/openshift.py

+#!/bin/python
+
+# (c) 2013, Michael Scherer <misc@zarb.org>
+#
+# 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/>.
+
+DOCUMENTATION = '''
+---
+inventory: openshift
+short_description: Openshift gears external inventory script
+description:
+  - Generates inventory of Openshift gears using the REST interface
+  - this permit to reuse playbook to setup a Openshift gear
+version_added: None
+author: Michael Scherer
+'''
+
+import urllib2
+try:
+    import json
+except ImportError:
+    import simplejson as json
+import os
+import os.path
+import sys
+import ConfigParser
+import StringIO
+
+configparser = None
+
+
+def get_from_rhc_config(variable):
+    global configparser
+    CONF_FILE = os.path.expanduser('~/.openshift/express.conf')
+    if os.path.exists(CONF_FILE):
+        if not configparser:
+            ini_str = '[root]\n' + open(CONF_FILE, 'r').read()
+            configparser = ConfigParser.SafeConfigParser()
+            configparser.readfp(StringIO.StringIO(ini_str))
+        try:
+            return configparser.get('root', variable)
+        except ConfigParser.NoOptionError:
+            return None
+
+
+def get_config(env_var, config_var):
+    result = os.getenv(env_var)
+    if not result:
+        result = get_from_rhc_config(config_var)
+    if not result:
+        print "failed=True msg='missing %s'" % env_var
+        sys.exit(1)
+    return result
+
+
+def get_json_from_api(url):
+    req = urllib2.Request(url, None, {'Accept': 'application/json; version=1.5'})
+    response = urllib2.urlopen(req)
+    return json.loads(response.read())['data']
+
+
+def passwd_setup(top_level_url, username, password):
+    # create a password manager
+    password_mgr = urllib2.HTTPPasswordMgrWithDefaultRealm()
+    password_mgr.add_password(None, top_level_url, username, password)
+
+    handler = urllib2.HTTPBasicAuthHandler(password_mgr)
+    opener = urllib2.build_opener(handler)
+
+    urllib2.install_opener(opener)
+
+
+username = get_config('ANSIBLE_OPENSHIFT_USERNAME', 'default_rhlogin')
+password = get_config('ANSIBLE_OPENSHIFT_PASSWORD', 'password')
+broker_url = 'https://%s/broker/rest/' % get_config('ANSIBLE_OPENSHIFT_BROKER', 'libra_server')
+
+
+passwd_setup(broker_url, username, password)
+
+response = get_json_from_api(broker_url + '/domains')
+
+response = get_json_from_api("%s/domains/%s/applications" %
+                             (broker_url, response[0]['id']))
+
+result = {}
+for app in response:
+
+    # ssh://520311404832ce3e570000ff@blog-johndoe.example.org
+    (user, host) = app['ssh_url'][6:].split('@')
+    app_name = host.split('-')[0]
+
+    result[app_name] = {}
+    result[app_name]['hosts'] = []
+    result[app_name]['hosts'].append(host)
+    result[app_name]['vars'] = {}
+    result[app_name]['vars']['ansible_ssh_user'] = user
+
+if len(sys.argv) == 2 and sys.argv[1] == '--list':
+    print json.dumps(result)
+elif len(sys.argv) == 3 and sys.argv[1] == '--host':
+    print json.dumps({})
+else:
+    print "Need a argument, either --list or --host <host>"