---
# Copyright 2019 Red Hat, Inc.
# All Rights Reserved.
#
# 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: gather facts
  hosts: all

- name: upgrade ceph mdss cluster, deactivate all rank > 0
  hosts: "{{ groups[mon_group_name|default('mons')][0] }}"
  become: true
  tasks:
    - name: deactivate all mds rank > 0
      when: groups.get(mds_group_name, []) | length > 0
      block:
        - import_role:
            name: ceph-defaults
        - import_role:
            name: ceph-facts

        - name: deactivate all mds rank > 0 if any
          when: groups.get(mds_group_name, []) | length > 1
          block:
            - name: set max_mds 1 on ceph fs
              command: "{{ container_exec_cmd | default('') }} ceph --cluster {{ cluster }} fs set {{ cephfs }} max_mds 1"
              changed_when: false

            - name: wait until only rank 0 is up
              command: "{{ container_exec_cmd | default('') }} ceph --cluster {{ cluster }} fs get {{ cephfs }} -f json"
              changed_when: false
              register: wait_rank_zero
              retries: 720
              delay: 5
              until: (wait_rank_zero.stdout | from_json).mdsmap.in | length == 1 and (wait_rank_zero.stdout | from_json).mdsmap.in[0]  == 0

            - name: get name of remaining active mds
              command: "{{ container_exec_cmd | default('') }} ceph --cluster {{ cluster }} fs dump -f json"
              changed_when: false
              register: _mds_active_name

            - name: set_fact mds_active_name
              set_fact:
                mds_active_name: "{{ (_mds_active_name.stdout | from_json)['filesystems'][0]['mdsmap']['info'][item.key]['name'] }}"
              with_dict: "{{ (_mds_active_name.stdout | default('{}') | from_json).filesystems[0]['mdsmap']['info'] | default({}) }}"

            - name: set_fact mds_active_host
              set_fact:
                mds_active_host: "{{ [hostvars[item]['inventory_hostname']] }}"
              with_items: "{{ groups[mds_group_name] }}"
              when: hostvars[item]['ansible_hostname'] == mds_active_name

            - name: create standby_mdss group
              add_host:
                name: "{{ item }}"
                groups: standby_mdss
                ansible_host: "{{ hostvars[item]['ansible_host'] | default(omit) }}"
                ansible_port: "{{ hostvars[item]['ansible_port'] | default(omit) }}"
              with_items: "{{ groups[mds_group_name] | difference(mds_active_host) }}"

            - name: stop standby ceph mds
              systemd:
                name: "ceph-mds@{{ hostvars[item]['ansible_hostname'] }}"
                state: stopped
                enabled: false
              delegate_to: "{{ item }}"
              with_items: "{{ groups['standby_mdss'] }}"
              when: groups['standby_mdss'] | default([]) | length > 0

            # dedicated task for masking systemd unit
            # somehow, having a single task doesn't work in containerized context
            - name: mask systemd units for standby ceph mds
              systemd:
                name: "ceph-mds@{{ hostvars[item]['ansible_hostname'] }}"
                masked: true
              delegate_to: "{{ item }}"
              with_items: "{{ groups['standby_mdss'] }}"
              when: groups['standby_mdss'] | default([]) | length > 0

            - name: wait until all standbys mds are stopped
              command: "{{ container_exec_cmd | default('') }} ceph --cluster {{ cluster }} fs dump -f json"
              changed_when: false
              register: wait_standbys_down
              retries: 300
              delay: 5
              until: (wait_standbys_down.stdout | from_json).standbys | length == 0