Generate static inventory with shade inventory (#538)

* Autogenerate inventory/hosts when 'inventory: static' (Default),
  with the shade-inventory tool.
* Drop unused anymore: openstack.py and associated GPL notes,
  an example static inventory, omit manual updates for the
  inventory DNS names in the deployment guide.
* Switch openstack.py formatted inventory hostvars
  to the shade-inventory format (omit openstack.* from hostvars).
* Populate node labels from inventory vars instead of the heat
  templates combined with inventory vars.
* Add app (k8s minions) nodes group for primary node labels.

Signed-off-by: Bogdan Dobrelya <bdobreli@redhat.com>

8 files changed, 43 insertions, 1028 deletions

diff --git a/playbooks/provisioning/openstack/INVENTORY-LICENSE.txt b/playbooks/provisioning/openstack/INVENTORY-LICENSE.txt
deleted file mode 100644
index 94a9ed024..000000000
--- a/playbooks/provisioning/openstack/INVENTORY-LICENSE.txt
+++ /dev/null
@@ -1,674 +0,0 @@
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-  15. Disclaimer of Warranty.
-
-  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
-APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
-HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
-OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
-THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
-IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
-ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
-
-  16. Limitation of Liability.
-
-  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
-THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
-GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
-USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
-DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
-PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
-EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
-SUCH DAMAGES.
-
-  17. Interpretation of Sections 15 and 16.
-
-  If the disclaimer of warranty and limitation of liability provided
-above cannot be given local legal effect according to their terms,
-reviewing courts shall apply local law that most closely approximates
-an absolute waiver of all civil liability in connection with the
-Program, unless a warranty or assumption of liability accompanies a
-copy of the Program in return for a fee.
-
-                     END OF TERMS AND CONDITIONS
-
-            How to Apply These Terms to Your New Programs
-
-  If you develop a new program, and you want it to be of the greatest
-possible use to the public, the best way to achieve this is to make it
-free software which everyone can redistribute and change under these terms.
-
-  To do so, attach the following notices to the program.  It is safest
-to attach them to the start of each source file to most effectively
-state the exclusion of warranty; and each file should have at least
-the "copyright" line and a pointer to where the full notice is found.
-
-    <one line to give the program's name and a brief idea of what it does.>
-    Copyright (C) <year>  <name of author>
-
-    This program 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.
-
-    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
-
-Also add information on how to contact you by electronic and paper mail.
-
-  If the program does terminal interaction, make it output a short
-notice like this when it starts in an interactive mode:
-
-    <program>  Copyright (C) <year>  <name of author>
-    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
-    This is free software, and you are welcome to redistribute it
-    under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate
-parts of the General Public License.  Of course, your program's commands
-might be different; for a GUI interface, you would use an "about box".
-
-  You should also get your employer (if you work as a programmer) or school,
-if any, to sign a "copyright disclaimer" for the program, if necessary.
-For more information on this, and how to apply and follow the GNU GPL, see
-<http://www.gnu.org/licenses/>.
-
-  The GNU General Public License does not permit incorporating your program
-into proprietary programs.  If your program is a subroutine library, you
-may consider it more useful to permit linking proprietary applications with
-the library.  If this is what you want to do, use the GNU Lesser General
-Public License instead of this License.  But first, please read
-<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/playbooks/provisioning/openstack/README.md b/playbooks/provisioning/openstack/README.md
index a92bc8837..d5b7c53ee 100644
--- a/playbooks/provisioning/openstack/README.md
+++ b/playbooks/provisioning/openstack/README.md
@@ -112,6 +112,9 @@ The `openstack_num_masters`, `openstack_num_infra` and
 `openstack_num_nodes` values specify the number of Master, Infra and
 App nodes to create.
 
+The `openshift_cluster_node_labels` defines custom labels for your openshift
+cluster node groups, like app or infra nodes. For example: `{'region': 'infra'}`.
+
 The `openstack_nodes_to_remove` allows you to specify the numerical indexes
 of App nodes that should be removed; for example, ['0', '2'],
 
@@ -141,18 +144,6 @@ be the case for development environments. When turned off, the servers will
 be provisioned omitting the ``yum update`` command. This brings security
 implications though, and is not recommended for production deployments.
 
-### Update the DNS names in `inventory/hosts`
-
-The different server groups are currently grouped by the domain name,
-so if you end up using a different domain than
-`openshift.example.com`, you will need to update the `inventory/hosts`
-file.
-
-For example, if your final domain is `my.cloud.com`, you can run this
-command to fix update the `hosts` file:
-
-    sed -i 's/openshift.example.com/my.cloud.com/' inventory/hosts
-
 ### Configure the OpenShift parameters
 
 Finally, you need to update the DNS entry in
@@ -193,6 +184,4 @@ Once it succeeds, you can install openshift by running:
 ## License
 
 As the rest of the openshift-ansible-contrib repository, the code here is
-licensed under Apache 2. However, the openstack.py file under
-`sample-inventory` is GPLv3+. See the INVENTORY-LICENSE.txt file for the full
-text of the license.
+licensed under Apache 2.
diff --git a/playbooks/provisioning/openstack/openstack_dns_records.yml b/playbooks/provisioning/openstack/openstack_dns_records.yml
index b32b70ba9..b5f0840c5 100644
--- a/playbooks/provisioning/openstack/openstack_dns_records.yml
+++ b/playbooks/provisioning/openstack/openstack_dns_records.yml
@@ -1,7 +1,7 @@
 ---
 - name: "Generate list of private A records"
   set_fact:
-    private_records: "{{ private_records | default([]) + [ { 'type': 'A', 'hostname': hostvars[item]['ansible_hostname'], 'ip': hostvars[item]['openstack']['private_v4'] } ] }}"
+    private_records: "{{ private_records | default([]) + [ { 'type': 'A', 'hostname': hostvars[item]['ansible_hostname'], 'ip': hostvars[item]['private_v4'] } ] }}"
   with_items: "{{ groups['cluster_hosts'] }}"
 
 - name: "Set the private DNS server to use the external value (if provided)"
@@ -10,36 +10,36 @@
     nsupdate_key_secret_private: "{{ external_nsupdate_keys['private']['key_secret'] }}"
     nsupdate_key_algorithm_private: "{{ external_nsupdate_keys['private']['key_algorithm'] }}"
   when:
-  - external_nsupdate_keys is defined
-  - external_nsupdate_keys['private'] is defined
+    - external_nsupdate_keys is defined
+    - external_nsupdate_keys['private'] is defined
 
 - name: "Set the private DNS server to use the provisioned value"
   set_fact:
-    nsupdate_server_private: "{{ hostvars[groups['dns'][0]].openstack.public_v4 }}"
+    nsupdate_server_private: "{{ hostvars[groups['dns'][0]].public_v4 }}"
     nsupdate_key_secret_private: "{{ hostvars[groups['dns'][0]].nsupdate_keys['private-' + full_dns_domain].key_secret }}"
     nsupdate_key_algorithm_private: "{{ hostvars[groups['dns'][0]].nsupdate_keys['private-' + full_dns_domain].key_algorithm }}"
   when:
-  - nsupdate_server_private is undefined
+    - nsupdate_server_private is undefined
 
 - name: "Generate the private Add section for DNS"
   set_fact:
     private_named_records:
-    - view: "private"
-      zone: "{{ full_dns_domain }}"
-      server: "{{ nsupdate_server_private }}"
-      key_name: "{{ ( 'private-' + full_dns_domain ) }}"
-      key_secret: "{{ nsupdate_key_secret_private }}"
-      key_algorithm: "{{ nsupdate_key_algorithm_private | lower }}"
-      entries: "{{ private_records }}"
+      - view: "private"
+        zone: "{{ full_dns_domain }}"
+        server: "{{ nsupdate_server_private }}"
+        key_name: "{{ ( 'private-' + full_dns_domain ) }}"
+        key_secret: "{{ nsupdate_key_secret_private }}"
+        key_algorithm: "{{ nsupdate_key_algorithm_private | lower }}"
+        entries: "{{ private_records }}"
 
 - name: "Generate list of public A records"
   set_fact:
-    public_records: "{{ public_records | default([]) + [ { 'type': 'A', 'hostname': hostvars[item]['ansible_hostname'], 'ip': hostvars[item]['openstack']['public_v4'] } ] }}"
+    public_records: "{{ public_records | default([]) + [ { 'type': 'A', 'hostname': hostvars[item]['ansible_hostname'], 'ip': hostvars[item]['public_v4'] } ] }}"
   with_items: "{{ groups['cluster_hosts'] }}"
 
 - name: "Add wildcard records to the public A records"
   set_fact:
-    public_records: "{{ public_records | default([]) + [ { 'type': 'A', 'hostname': '*.' + openshift_app_domain, 'ip': hostvars[item]['openstack']['public_v4'] } ] }}"
+    public_records: "{{ public_records | default([]) + [ { 'type': 'A', 'hostname': '*.' + openshift_app_domain, 'ip': hostvars[item]['public_v4'] } ] }}"
   with_items: "{{ groups['infra_hosts'] }}"
 
 - name: "Set the public DNS server details to use the external value (if provided)"
@@ -48,27 +48,27 @@
     nsupdate_key_secret_public: "{{ external_nsupdate_keys['public']['key_secret'] }}"
     nsupdate_key_algorithm_public: "{{ external_nsupdate_keys['public']['key_algorithm'] }}"
   when:
-  - external_nsupdate_keys is defined
-  - external_nsupdate_keys['public'] is defined
+    - external_nsupdate_keys is defined
+    - external_nsupdate_keys['public'] is defined
 
 - name: "Set the public DNS server details to use the provisioned value"
   set_fact:
-    nsupdate_server_public: "{{ hostvars[groups['dns'][0]].openstack.public_v4 }}"
+    nsupdate_server_public: "{{ hostvars[groups['dns'][0]].public_v4 }}"
     nsupdate_key_secret_public: "{{ hostvars[groups['dns'][0]].nsupdate_keys['public-' + full_dns_domain].key_secret }}"
     nsupdate_key_algorithm_public: "{{ hostvars[groups['dns'][0]].nsupdate_keys['public-' + full_dns_domain].key_algorithm }}"
   when:
-  - nsupdate_server_public is undefined
+    - nsupdate_server_public is undefined
 
 - name: "Generate the public Add section for DNS"
   set_fact:
     public_named_records:
-    - view: "public"
-      zone: "{{ full_dns_domain }}"
-      server: "{{ nsupdate_server_public }}"
-      key_name: "{{ ( 'public-' + full_dns_domain ) }}"
-      key_secret: "{{ nsupdate_key_secret_public }}"
-      key_algorithm: "{{ nsupdate_key_algorithm_public | lower }}"
-      entries: "{{ public_records }}"
+      - view: "public"
+        zone: "{{ full_dns_domain }}"
+        server: "{{ nsupdate_server_public }}"
+        key_name: "{{ ( 'public-' + full_dns_domain ) }}"
+        key_secret: "{{ nsupdate_key_secret_public }}"
+        key_algorithm: "{{ nsupdate_key_algorithm_public | lower }}"
+        entries: "{{ public_records }}"
 
 - name: "Generate the final dns_records_add"
   set_fact:
diff --git a/playbooks/provisioning/openstack/openstack_dns_views.yml b/playbooks/provisioning/openstack/openstack_dns_views.yml
index ea0a7cb96..7165b4269 100644
--- a/playbooks/provisioning/openstack/openstack_dns_views.yml
+++ b/playbooks/provisioning/openstack/openstack_dns_views.yml
@@ -1,24 +1,24 @@
 ---
 - name: "Generate ACL list for DNS server"
   set_fact:
-    acl_list: "{{ acl_list | default([]) + [ (hostvars[item]['openstack']['private_v4'] + '/32') ] }}"
+    acl_list: "{{ acl_list | default([]) + [ (hostvars[item]['private_v4'] + '/32') ] }}"
   with_items: "{{ groups['cluster_hosts'] }}"
 
 - name: "Generate the private view"
   set_fact:
     private_named_view:
-    - name: "private"
-      acl_entry: "{{ acl_list }}"
-      zone:
-      - dns_domain: "{{ full_dns_domain }}"
+      - name: "private"
+        acl_entry: "{{ acl_list }}"
+        zone:
+          - dns_domain: "{{ full_dns_domain }}"
 
 - name: "Generate the public view"
   set_fact:
     public_named_view:
-    - name: "public"
-      zone:
-      - dns_domain: "{{ full_dns_domain }}"
-      forwarder: "{{ public_dns_nameservers }}"
+      - name: "public"
+        zone:
+          - dns_domain: "{{ full_dns_domain }}"
+        forwarder: "{{ public_dns_nameservers }}"
 
 - name: "Generate the final named_config_views"
   set_fact:
diff --git a/playbooks/provisioning/openstack/pre_tasks.yml b/playbooks/provisioning/openstack/pre_tasks.yml
index a4ff7c4ac..d73945644 100644
--- a/playbooks/provisioning/openstack/pre_tasks.yml
+++ b/playbooks/provisioning/openstack/pre_tasks.yml
@@ -15,12 +15,6 @@
     env_id: "{{ env_id | default(default_env_id) }}"
   delegate_to: localhost
 
-- name: Set Dynamic Inventory Filters
-  become: false
-  shell: >
-    export OS_INV_FILTER_KEY=clusterid && export OS_INV_FILTER_VALUE={{ env_id }}
-  delegate_to: localhost
-
 - name: Updating DNS domain to include env_id (if not empty)
   set_fact:
     full_dns_domain: "{{ (env_id|trim == '') | ternary(public_dns_domain, env_id + '.' + public_dns_domain) }}"
diff --git a/playbooks/provisioning/openstack/sample-inventory/group_vars/OSEv3.yml b/playbooks/provisioning/openstack/sample-inventory/group_vars/OSEv3.yml
index 4ce96a031..a16c1d867 100644
--- a/playbooks/provisioning/openstack/sample-inventory/group_vars/OSEv3.yml
+++ b/playbooks/provisioning/openstack/sample-inventory/group_vars/OSEv3.yml
@@ -5,9 +5,11 @@ openshift_release: 1.5.1
 #openshift_release: v3.5
 openshift_master_default_subdomain: "apps.{{ env_id }}.{{ public_dns_domain }}"
 
-# NOTE(shadower): do not remove this line, otherwise the default node labels
-# won't be set up.
-openshift_node_labels: "{{ openstack.metadata.node_labels }}"
+#openshift_cluster_node_labels:
+#  app:
+#    region: primary
+#  infra:
+#    region: infra
 
 osm_default_node_selector: 'region=primary'
 
diff --git a/playbooks/provisioning/openstack/sample-inventory/hosts b/playbooks/provisioning/openstack/sample-inventory/hosts
deleted file mode 100644
index 5f73b60f6..000000000
--- a/playbooks/provisioning/openstack/sample-inventory/hosts
+++ /dev/null
@@ -1,44 +0,0 @@
-#[all:vars]
-# For all group_vars, see ./group_vars/all.yml
-
-# Create an OSEv3 group that contains the master, nodes, etcd, and lb groups.
-# The lb group lets Ansible configure HAProxy as the load balancing solution.
-# Comment lb out if your load balancer is pre-configured.
-[cluster_hosts:children]
-OSEv3
-dns
-
-[OSEv3:children]
-masters
-nodes
-etcd
-
-# Set variables common for all OSEv3 hosts
-#[OSEv3:vars]
-
-# For OSEv3 normal group vars, see ./group_vars/OSEv3.yml
-
-# Host Groups
-
-[masters:children]
-masters.openshift.example.com
-
-[etcd:children]
-etcd.openshift.example.com
-
-[nodes:children]
-masters
-infra.openshift.example.com
-nodes.openshift.example.com
-
-[infra_hosts:children]
-infra.openshift.example.com
-
-[dns:children]
-dns.openshift.example.com
-
-[masters.openshift.example.com]
-[etcd.openshift.example.com]
-[infra.openshift.example.com]
-[nodes.openshift.example.com]
-[dns.openshift.example.com]
diff --git a/playbooks/provisioning/openstack/sample-inventory/openstack.py b/playbooks/provisioning/openstack/sample-inventory/openstack.py
deleted file mode 100755
index 8de73e1e0..000000000
--- a/playbooks/provisioning/openstack/sample-inventory/openstack.py
+++ /dev/null
@@ -1,252 +0,0 @@
-#!/usr/bin/env python
-
-# Copyright (c) 2012, Marco Vito Moscaritolo <marco@agavee.com>
-# Copyright (c) 2013, Jesse Keating <jesse.keating@rackspace.com>
-# Copyright (c) 2015, Hewlett-Packard Development Company, L.P.
-# Copyright (c) 2016, Rackspace Australia
-#
-# This module 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.
-#
-# This software 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 this software.  If not, see <http://www.gnu.org/licenses/>.
-
-# The OpenStack Inventory module uses os-client-config for configuration.
-# https://github.com/stackforge/os-client-config
-# This means it will either:
-#  - Respect normal OS_* environment variables like other OpenStack tools
-#  - Read values from a clouds.yaml file.
-# If you want to configure via clouds.yaml, you can put the file in:
-#  - Current directory
-#  - ~/.config/openstack/clouds.yaml
-#  - /etc/openstack/clouds.yaml
-#  - /etc/ansible/openstack.yml
-# The clouds.yaml file can contain entries for multiple clouds and multiple
-# regions of those clouds. If it does, this inventory module will connect to
-# all of them and present them as one contiguous inventory.
-#
-# See the adjacent openstack.yml file for an example config file
-# There are two ansible inventory specific options that can be set in
-# the inventory section.
-# expand_hostvars controls whether or not the inventory will make extra API
-#                 calls to fill out additional information about each server
-# use_hostnames changes the behavior from registering every host with its UUID
-#               and making a group of its hostname to only doing this if the
-#               hostname in question has more than one server
-# fail_on_errors causes the inventory to fail and return no hosts if one cloud
-#                has failed (for example, bad credentials or being offline).
-#                When set to False, the inventory will return hosts from
-#                whichever other clouds it can contact. (Default: True)
-
-import argparse
-import collections
-import os
-import sys
-import time
-from distutils.version import StrictVersion
-
-try:
-    import json
-except ImportError:
-    import simplejson as json
-
-import os_client_config
-import shade
-import shade.inventory
-
-CONFIG_FILES = ['/etc/ansible/openstack.yaml', '/etc/ansible/openstack.yml']
-
-
-def get_groups_from_server(server_vars, namegroup=True):
-    groups = []
-
-    region = server_vars['region']
-    cloud = server_vars['cloud']
-    metadata = server_vars.get('metadata', {})
-
-    # Create a group for the cloud
-    groups.append(cloud)
-
-    # Create a group on region
-    groups.append(region)
-
-    # And one by cloud_region
-    groups.append("%s_%s" % (cloud, region))
-
-    # Check if group metadata key in servers' metadata
-    if 'group' in metadata:
-        groups.append(metadata['group'])
-
-    for extra_group in metadata.get('groups', '').split(','):
-        if extra_group:
-            groups.append(extra_group.strip())
-
-    groups.append('instance-%s' % server_vars['id'])
-    if namegroup:
-        groups.append(server_vars['name'])
-
-    for key in ('flavor', 'image'):
-        if 'name' in server_vars[key]:
-            groups.append('%s-%s' % (key, server_vars[key]['name']))
-
-    for key, value in iter(metadata.items()):
-        groups.append('meta-%s_%s' % (key, value))
-
-    az = server_vars.get('az', None)
-    if az:
-        # Make groups for az, region_az and cloud_region_az
-        groups.append(az)
-        groups.append('%s_%s' % (region, az))
-        groups.append('%s_%s_%s' % (cloud, region, az))
-    return groups
-
-
-def get_host_groups(inventory, refresh=False):
-    (cache_file, cache_expiration_time) = get_cache_settings()
-    if is_cache_stale(cache_file, cache_expiration_time, refresh=refresh):
-        groups = to_json(get_host_groups_from_cloud(inventory))
-        open(cache_file, 'w').write(groups)
-    else:
-        groups = open(cache_file, 'r').read()
-    return groups
-
-
-def append_hostvars(hostvars, groups, key, server, namegroup=False):
-    hostvars[key] = dict(
-        ansible_ssh_host=server['interface_ip'],
-        openshift_hostname=server['name'],
-        openshift_public_hostname=server['name'],
-        openstack=server)
-    for group in get_groups_from_server(server, namegroup=namegroup):
-        groups[group].append(key)
-
-
-def get_host_groups_from_cloud(inventory):
-    groups = collections.defaultdict(list)
-    firstpass = collections.defaultdict(list)
-    hostvars = {}
-    list_args = {}
-    if hasattr(inventory, 'extra_config'):
-        use_hostnames = inventory.extra_config['use_hostnames']
-        list_args['expand'] = inventory.extra_config['expand_hostvars']
-        if StrictVersion(shade.__version__) >= StrictVersion("1.6.0"):
-            list_args['fail_on_cloud_config'] = \
-                inventory.extra_config['fail_on_errors']
-    else:
-        use_hostnames = False
-
-    for server in inventory.list_hosts(**list_args):
-
-        if 'interface_ip' not in server:
-            continue
-        try:
-            if server["metadata"][os.environ['OS_INV_FILTER_KEY']] == os.environ['OS_INV_FILTER_VALUE']:
-                firstpass[server['name']].append(server)
-        except Exception:
-            firstpass[server['name']].append(server)
-    for name, servers in firstpass.items():
-        if len(servers) == 1 and use_hostnames:
-            append_hostvars(hostvars, groups, name, servers[0])
-        else:
-            server_ids = set()
-            # Trap for duplicate results
-            for server in servers:
-                server_ids.add(server['id'])
-            if len(server_ids) == 1 and use_hostnames:
-                append_hostvars(hostvars, groups, name, servers[0])
-            else:
-                for server in servers:
-                    append_hostvars(
-                        hostvars, groups, server['id'], server,
-                        namegroup=True)
-    groups['_meta'] = {'hostvars': hostvars}
-    return groups
-
-
-def is_cache_stale(cache_file, cache_expiration_time, refresh=False):
-    ''' Determines if cache file has expired, or if it is still valid '''
-    if refresh:
-        return True
-    if os.path.isfile(cache_file) and os.path.getsize(cache_file) > 0:
-        mod_time = os.path.getmtime(cache_file)
-        current_time = time.time()
-        if (mod_time + cache_expiration_time) > current_time:
-            return False
-    return True
-
-
-def get_cache_settings():
-    config = os_client_config.config.OpenStackConfig(
-        config_files=os_client_config.config.CONFIG_FILES + CONFIG_FILES)
-    # For inventory-wide caching
-    cache_expiration_time = config.get_cache_expiration_time()
-    cache_path = config.get_cache_path()
-    if not os.path.exists(cache_path):
-        os.makedirs(cache_path)
-    cache_file = os.path.join(cache_path, 'ansible-inventory.cache')
-    return (cache_file, cache_expiration_time)
-
-
-def to_json(in_dict):
-    return json.dumps(in_dict, sort_keys=True, indent=2)
-
-
-def parse_args():
-    parser = argparse.ArgumentParser(description='OpenStack Inventory Module')
-    parser.add_argument('--private',
-                        action='store_true',
-                        help='Use private address for ansible host')
-    parser.add_argument('--refresh', action='store_true',
-                        help='Refresh cached information')
-    parser.add_argument('--debug', action='store_true', default=False,
-                        help='Enable debug output')
-    group = parser.add_mutually_exclusive_group(required=True)
-    group.add_argument('--list', action='store_true',
-                       help='List active servers')
-    group.add_argument('--host', help='List details about the specific host')
-
-    return parser.parse_args()
-
-
-def main():
-    args = parse_args()
-    try:
-        config_files = os_client_config.config.CONFIG_FILES + CONFIG_FILES
-        shade.simple_logging(debug=args.debug)
-        inventory_args = dict(
-            refresh=args.refresh,
-            config_files=config_files,
-            private=args.private,
-        )
-        if hasattr(shade.inventory.OpenStackInventory, 'extra_config'):
-            inventory_args.update(dict(
-                config_key='ansible',
-                config_defaults={
-                    'use_hostnames': False,
-                    'expand_hostvars': True,
-                    'fail_on_errors': True,
-                }
-            ))
-
-        inventory = shade.inventory.OpenStackInventory(**inventory_args)
-
-        if args.list:
-            output = get_host_groups(inventory, refresh=args.refresh)
-        elif args.host:
-            output = to_json(inventory.get_host(args.host))
-        print(output)
-    except shade.OpenStackCloudException as e:
-        sys.stderr.write('%s\n' % str(e))
-        sys.exit(1)
-    sys.exit(0)
-
-
-if __name__ == '__main__':
-    main()