---
# Copyright 2016, Rackspace US, 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.

# When doing a rolling replacement of an existing cluster,
# a service may not yet exist on the target host. This will
# cause the service stop task to fail. To cater for this
# we only try to stop the service is it exists.
- name: Check whether a mysql service exists yet
  shell: >-
    systemctl list-unit-files --state=enabled --type=service | grep "^mysql.service .* enabled$"
  args:
    executable: /bin/bash
    warn: no
  changed_when: false
  failed_when: false
  register: _mysql_service_exists

- name: Stop MariaDB
  systemd:
    name: mysql
    state: stopped
  register: galera_restart_fall_back
  until: galera_restart_fall_back is success
  retries: 3
  delay: 5
  when:
    - _mysql_service_exists.rc == 0

- name: UN-Install galera-server package
  package:
    name: "{{ item }}"
    state: absent
  with_items:
    - "{{ galera_server_upgrade_packages_remove }}"

- name: Remove old apt sources
  block:
    # TODO: Remove the following three tasks in Pike
    # They're only required during upgrades transitioning to a
    # statically named apt sources file.
    - name: Find old sources
      command: >
        grep -rnil maria /etc/apt/sources.list.d/ --exclude MariaDB.list
      changed_when: false
      failed_when: false
      register: old_sources

    - name: Remove old sources
      file:
        path: "{{ item }}"
        state: absent
      with_items: "{{ old_sources.stdout_lines | default([]) }}"

    - name: Update apt sources (Forced)
      apt:
        update_cache: yes
        cache_valid_time: 0
      register: apt_update
      until: apt_update is success
      retries: 5
      delay: 2
  when:
    - ansible_pkg_mgr == "apt"