[ATMOSPHERE-463] Setup a lvm role to update lvm configure

roles/lvm/README.md

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+# `lvm`

roles/lvm/tasks/main.yml

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+# Copyright (c) 2023 VEXXHOST, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+- name: Discover lvm devices
+  ansible.builtin.shell: |
+    set -o pipefail
+    /sbin/pvdisplay | awk '/PV\ Name/ {print $3}' | sed 's/\/dev\///g'
+  register: lvm_devices
+  changed_when: lvm_devices.rc != 0
+  failed_when: false
+
+- name: Ensure "/etc/lvm" directory
+  ansible.builtin.file:
+    state: "directory"
+    path: "/etc/lvm"
+    mode: "0755"
+  when: lvm_devices.rc == 0
+
+- name: Drop lvm Config
+  ansible.builtin.template:
+    src: "lvm.conf.j2"
+    dest: "/etc/lvm/lvm.conf"
+    owner: "root"
+    group: "root"
+    backup: "yes"
+    mode: "0644"
+  when: lvm_devices.rc == 0

roles/lvm/templates/lvm.conf.j2

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+{% set used_lvm_devices = [] %}
+{% set cinder_lvm_devices_filter_override = [] %}
+{% if cinder_lvm_devices_filter_override|length > 0 %}
+    {% set used_lvm_devices = cinder_lvm_devices_filter_override %}
+{% else %}
+    {% set lv_devices = lvm_devices.stdout.split('\n') %}
+    {% if lv_devices|length > 0 %}
+        {% for net in lv_devices %}
+            {% if net != '' %}
+                {% set lv_device = '"a/' + net + '/"' %}
+                {% if used_lvm_devices.append(lv_device) %}{% endif %}
+            {% endif %}
+        {% endfor %}
+    {% endif %}
+
+# Ansible Discovered LVM Devices {{ lv_devices }}
+{% endif %}
+
+{% if used_lvm_devices|length <= 0 %}
+    {# If there are no LVM devices present, allow all devices to be scanned #}
+    {% if used_lvm_devices.append('"a/.*/"') %}{% endif %}
+{% else %}
+    {# Append 'loop.*' to the list to help with AIO deployments. #}
+    {% if used_lvm_devices.append('"a/loop.*/"') %}{% endif %}
+    {# Disable scanning any other devices than the ones listed. #}
+    {% if used_lvm_devices.append('"r/.*/"') %}{% endif %}
+{% endif %}
+
+devices {
+    filter = [ {{ used_lvm_devices|join(', ') }} ]
+}