Provide MDT Dynamic Inventory script (#18352)

* Add files via upload

* Update mdt_dynamic_inventory.py

Adding maintainer name in docstring
fixing deprecated print syntax on a few lines
fixing configparser import to support python2 and python3

* Update mdt_dynamic_inventory.py

* Update mdt_dynamic_inventory.py

Adding --host functionality

mdt.ini

@@ -0,0 +1,17 @@
+[mdt]
+
+# Set the MDT server to connect to
+server = localhost.example.com
+
+# Set the MDT Instance
+instance = EXAMPLEINSTANCE
+
+# Set the MDT database
+database = MDTDB
+
+# Configure login credentials
+user = local.domain\admin
+password = adminpassword
+
+[tower]
+groupname = mdt

mdt_dynamic_inventory.py

@@ -0,0 +1,132 @@
+#!/usr/bin/env python
+
+# (c) 2016, Julian Barnett <jbarnett@tableau.com>
+#
+# 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/>.
+
+'''
+MDT external inventory script
+=================================
+author: J Barnett 06/23/2016 01:15
+maintainer: J Barnett (github @jbarnett1981)
+'''
+
+import argparse
+import json
+import pymssql
+try:
+    import configparser
+except ImportError:
+    import ConfigParser as configparser
+
+class MDTInventory(object):
+
+    def __init__(self):
+        ''' Main execution path '''
+        self.conn = None
+
+        # Initialize empty inventory
+        self.inventory = self._empty_inventory()
+
+        # Read CLI arguments
+        self.read_settings()
+        self.parse_cli_args()
+
+        # Get Hosts
+        if self.args.list:
+            self.get_hosts()
+
+        # Get specific host vars
+        if self.args.host:
+            self.get_hosts(self.args.host)
+
+    def _connect(self, query):
+        '''
+        Connect to MDT and dump contents of dbo.ComputerIdentity database
+        '''
+        if not self.conn:
+            self.conn = pymssql.connect(server=self.mdt_server + "\\" + self.mdt_instance, user=self.mdt_user, password=self.mdt_password, database=self.mdt_database)
+            cursor = self.conn.cursor()
+            cursor.execute(query)
+            self.mdt_dump = cursor.fetchall()
+            self.conn.close()
+
+    def get_hosts(self, hostname=False):
+        '''
+        Gets host from MDT Database
+        '''
+        if hostname:
+        	query = "SELECT t1.ID, t1.Description, t1.MacAddress, t2.Role FROM ComputerIdentity as t1 join Settings_Roles as t2 on t1.ID = t2.ID where t1.Description = '%s'" % hostname
+        else:
+        	query = 'SELECT t1.ID, t1.Description, t1.MacAddress, t2.Role FROM ComputerIdentity as t1 join Settings_Roles as t2 on t1.ID = t2.ID'
+        self._connect(query)
+
+        # Configure to group name configured in Ansible Tower for this inventory
+        groupname = self.mdt_groupname
+
+        # Initialize empty host list
+        hostlist = []
+
+        # Parse through db dump and populate inventory
+        for hosts in self.mdt_dump:
+            self.inventory['_meta']['hostvars'][hosts[1]] = {'id': hosts[0], 'name': hosts[1], 'mac': hosts[2], 'role': hosts[3]}
+            hostlist.append(hosts[1])
+        self.inventory[groupname] = hostlist
+
+        # Print it all out
+        print(json.dumps(self.inventory, indent=2))
+
+    def _empty_inventory(self):
+        '''
+        Create empty inventory dictionary
+        '''
+        return {"_meta" : {"hostvars" : {}}}
+
+    def read_settings(self):
+        '''
+        Reads the settings from the mdt.ini file
+        '''
+        config = configparser.SafeConfigParser()
+        config.read('mdt.ini')
+
+        # MDT Server and instance and database
+        self.mdt_server = config.get('mdt', 'server')
+        self.mdt_instance = config.get('mdt', 'instance')
+        self.mdt_database = config.get('mdt', 'database')
+
+        # MDT Login credentials
+        if config.has_option('mdt', 'user'):
+            self.mdt_user = config.get('mdt', 'user')
+        if config.has_option('mdt', 'password'):
+            self.mdt_password = config.get('mdt', 'password')
+
+        # Group name in Tower
+        if config.has_option('tower', 'groupname'):
+            self.mdt_groupname = config.get('tower', 'groupname')
+
+
+    def parse_cli_args(self):
+        '''
+        Command line argument processing
+        '''
+        parser = argparse.ArgumentParser(description='Produce an Ansible Inventory file based on MDT')
+        parser.add_argument('--list', action='store_true', default=False, help='List instances')
+        parser.add_argument('--host', action='store', help='Get all the variables about a specific instance')
+        self.args = parser.parse_args()
+
+if __name__ == "__main__":
+    # Run the script
+    MDTInventory()