azure@desktop5  ~/ansible   master ✚  cat plugins/inventory/terraform.py             
import json
import os
from subprocess import check_output

from ansible.plugins.inventory import BaseInventoryPlugin, Constructable, Cacheable


def get_state(terraform_dir):
    terraform_bin = os.environ.get('ANSIBLE_TF_BIN', 'terraform')
    output = check_output([terraform_bin, 'state', 'pull', '-input=false'],
                          cwd=terraform_dir)
    return json.loads(output)


class InventoryModule(BaseInventoryPlugin, Constructable, Cacheable):
    NAME = 'terraform'

    def verify_file(self, path):
        """Checks the path is a directory containing a .tf file."""
        return path.endswith('.tf')

    def parse(self, inventory, loader, path, cache=True):
        super(InventoryModule, self).parse(inventory, loader, path, cache)

        state = get_state(os.path.dirname(path))
        for module in state['modules']:
            self._parse_azurerm_resources(module['resources'])

    def _parse_azurerm_resources(self, resources):
        """Populate the ansible inventory from azure resources."""
        interfaces = self._get_azurerm_interfaces(resources)
        self._parse_azurerm_vms(interfaces, resources)

    def _get_azurerm_interfaces(self, resources):
        """Returns a dict associating the interface's attributes to
        each interface ID."""
        interfaces = {}
        for (name, resource) in resources.items():
            if resource['type'] == 'azurerm_network_interface':
                id_ = resource['primary']['id']
                interfaces[id_] = resource['primary']['attributes']
        return interfaces

    def _parse_azurerm_vms(self, interfaces, resources):
        """Populates the ansible inventory with the VMs in the `resources`
        dict."""
        for (name, resource) in resources.items():
            if resource['type'] == 'azurerm_virtual_machine':
                attributes = resource['primary']['attributes']
                host = attributes['name']
                self.inventory.add_host(host)

                interface = interfaces[attributes['network_interface_ids.0']]
                ip_address = interface['private_ip_address']
                self.inventory.set_variable(host, 'ansible_host', ip_address)

 azure@desktop5  ~/ansible   master ✚  cat ansible.cfg| sed "s/#.*//" | grep inventory
inventory      = /home/azure/ansible/hosts,/home/azure/ansible/terraform/test.tf
inventory_plugins  = /home/azure/ansible/plugins/inventory
[inventory]