added ansible inventory script

ansible/ansible.cfg

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+[defaults]
+inventory_plugins=./plugins/inventory

ansible/cosmos_inventory.yaml

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+plugin: cosmos_inventory

ansible/plugins/inventory/cosmos_inventory.py

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+from __future__ import (absolute_import, division, print_function)
+from ansible import constants as C
+from ansible.plugins.inventory import BaseInventoryPlugin
+from ansible.errors import AnsibleError, AnsibleParserError
+import os
+import yaml
+
+__metaclass__ = type
+
+DOCUMENTATION = r'''
+    name: cosmos_inventory
+    plugin_type: inventory
+    short_description: Returns Ansible inventory from CSV
+    description: Returns Ansible inventory from CSV
+    options:
+      plugin:
+          description: Name of the plugin
+          required: true
+          choices: ['cosmos_inventory']
+'''
+
+class InventoryModule(BaseInventoryPlugin):
+
+    NAME = 'cosmos_inventory'  # used internally by Ansible, it should match the file name but not required
+
+    def verify_file(self, path):
+      '''Return true/false if this is possibly a valid file for this plugin to consume
+
+      '''
+      valid = False
+      if super(InventoryModule, self).verify_file(path):
+          #base class verifies that file exists 
+          #and is readable by current user
+          if path.endswith(('cosmos_inventory.yaml',
+                            'cosmos_inventory.yml')):
+              valid = True
+      return valid
+    
+    def parse(self, inventory, loader, path, cache):
+      '''Return dynamic inventory from source '''
+      super(InventoryModule, self).parse(inventory, loader, path, cache)
+      # Read the inventory YAML file
+      self._read_config_data(path)
+      try:
+          # Store the options from the YAML file
+          self.plugin = self.get_option('plugin')
+      except Exception as e:
+          raise AnsibleParserError(
+              'All correct options required: {}'.format(e))
+      # Call our internal helper to populate the dynamic inventory
+      self._populate()
+
+    def _populate(self):
+      '''Return the hosts and groups'''
+      cosmos_rules = None
+      base_path = os.path.join(os.path.dirname(C.CONFIG_FILE),'..')
+      with open(f'{base_path}/cosmos-rules.yaml', 'r') as file:
+        cosmos_rules = yaml.safe_load(file)
+      for entry in os.listdir(base_path):
+        full_path = os.path.join(base_path, entry)
+        if not os.path.isdir(full_path):
+          continue
+        if entry == 'default':
+          continue
+        if '.' not in entry:
+          continue
+        if 'README' in os.listdir(full_path):
+          self.inventory.add_host(entry)