From eb569c05c70be702519180e8d382ecf1ba8189ca Mon Sep 17 00:00:00 2001
From: Ethan Paul <e@enp.one>
Date: Sat, 13 Nov 2021 21:09:54 -0500
Subject: [PATCH] Add install of gluster storage plugin to swarm role

---
 roles/swarm/tasks/gluster.yaml | 62 ++++++++++++++++++++++++++++++++++
 roles/swarm/tasks/main.yaml    |  3 ++
 2 files changed, 65 insertions(+)
 create mode 100644 roles/swarm/tasks/gluster.yaml

diff --git a/roles/swarm/tasks/gluster.yaml b/roles/swarm/tasks/gluster.yaml
new file mode 100644
index 0000000..8a43de4
--- /dev/null
+++ b/roles/swarm/tasks/gluster.yaml
@@ -0,0 +1,62 @@
+---
+- name: Fetch glusterfs plugin state
+  block:
+    - name: Fetch glusterfs storage plugin state
+      ansible.builtin.command:
+        cmd: docker plugin inspect glusterfs
+      changed_when: false
+      register: _docker_glusterfs_storage_plugin_raw
+  rescue:
+    - name: Install glusterfs storage plugin
+      ansible.builtin.command:
+        cmd: docker plugin install --alias glusterfs mochoa/glusterfs-volume-plugin --grant-all-permissions --disable
+      changed_when: true
+
+    - name: Fetch glusterfs storage plugin state
+      ansible.builtin.command:
+        cmd: docker plugin inspect glusterfs
+      changed_when: false
+      register: _docker_glusterfs_storage_plugin_raw
+
+- name: Process glusterfs storage plugin config
+  ansible.builtin.set_fact:
+    _docker_glusterfs_storage_plugin: "{{ (_docker_glusterfs_storage_plugin_raw.stdout | from_json)[0] }}"
+
+# Note that this might not end up being defined if the plugin has not been configured
+- name: Identify plugin server settings
+  when: item.startswith('SERVERS')
+  ansible.builtin.set_fact:
+    _docker_glusterfs_existing_setting: "{{ item }}"
+  loop: "{{ _docker_glusterfs_storage_plugin.Settings.Env }}"
+
+- name: Determine gluster servers
+  run_once: true
+  when: "'datastore' in hostvars[item].skylab_roles | default([])"
+  vars:
+    _docker_glusterfs_hostnames: []
+  ansible.builtin.set_fact:
+    _docker_glusterfs_hostnames: "{{ _docker_glusterfs_hostnames + [item + '.local'] }}"
+  loop: "{{ groups.cluster }}"
+
+- name: Determine gluster plugin setting
+  ansible.builtin.set_fact:
+    _docker_glusterfs_setting: "SERVERS={{ _docker_glusterfs_hostnames | join(',') }}"
+
+- name: Configure plugin
+  when: _docker_glusterfs_setting != _docker_glusterfs_existing_setting
+  block:
+    - name: Disable plugin
+      when: _docker_glusterfs_storage_plugin.Enabled
+      ansible.builtin.command:
+        cmd: docker plugin disable glusterfs
+
+    - name: Set plugin servers setting
+      changed_when: true
+      ansible.builtin.command:
+        cmd: docker plugin set glusterfs {{ _docker_glusterfs_setting }}
+      register: _docker_glusterfs_set_setting
+
+- name: Enable plugin
+  when: not _docker_glusterfs_storage_plugin.Enabled or _docker_glusterfs_set_setting.changed | default(false)
+  ansible.builtin.command:
+    cmd: docker plugin enable glusterfs
diff --git a/roles/swarm/tasks/main.yaml b/roles/swarm/tasks/main.yaml
index 3ff7665..cff4e13 100644
--- a/roles/swarm/tasks/main.yaml
+++ b/roles/swarm/tasks/main.yaml
@@ -16,3 +16,6 @@
 - name: Join server to swarm
   when: _docker_swarm_needs_join
   ansible.builtin.include_tasks: join.yaml
+
+- name: Configure gluster storage driver
+  ansible.builtin.import_tasks: gluster.yaml