---
#   Copyright 2019 Red Hat, 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: TripleO Undercloud backup workflows
  hosts: undercloud
  gather_facts: false
  any_errors_fatal: true
  max_fail_percentage: 0
  vars:
    sources_path: '/home/stack/'
  handlers:
    # Perform some cleanup
    - name: cleanup the backup
      become: true
      file:
        path: "{{ item }}"
        state: absent
      with_items:
        - "{{ bkp_path }}"
        - "{{ tmpdir.path }}/"

  pre_tasks:
    # Action to know if there is enough available space
    # to run the Undercloud backup
    - name: Get free space
      shell: |
        set -o pipefail
        if [[ $(df -T /var/tmp | tail -n 1 | awk '{print $2}') == "btrfs" ]]; then
          btrfs fi usage --gbytes / | awk '/^.*Free / {print $3}'| sed 's/\..*//'
        else
          df -BG /var/tmp | awk '!/^Filesystem/ {print $4}' | sed 's/G//'
        fi
      register: var_space_available

    - name: Fail if any of the volumes are too small
      fail:
        msg: >
          Minimum free space required for /var/tmp: 10G
          - current free space: {{ var_space_available.stdout|int  |round(1) }}G
      when:
        - (var_space_available.stdout | int) < 10
  tasks:
    - name: Create a timestamp variable
      set_fact:
        timestamp: "{{ lookup('pipe','date +%Y%m%d%H%M%S') }}"

    - name: Create staging directory
      tempfile:
        state: directory
        prefix: "undercloud-backup-"
        path: "/var/tmp"
      register: tmpdir
      notify:
        - cleanup the backup

    # The Undercloud database password for the root
    # user is stored in a Mistral environment, we
    # need the password in order to run the database dump
    - name: get_database_credentials
      shell: |-
        set -o pipefail
        mistral environment-get tripleo.undercloud-config -f json | jq -r ".Variables" | jq -r ".undercloud_db_password"
      register: undercloud_db_password

    - name: Create the names for the temporary backup files
      set_fact:
        db_path: "{{ tmpdir.path }}/all-databases-{{ timestamp }}.sql.gz"
        fs_path: "{{ tmpdir.path }}/filesystem-{{ timestamp }}.sql.gz"
        bkp_path: "/tmp/UC-backup-{{ timestamp }}.tar"

    # We use the undercloud database password for the root
    # to backup the databases
    - name: Backup the databases
      become: true
      shell: |-
        set -o pipefail
        podman exec -i mysql mysqldump -u root -p{{ undercloud_db_password.stdout }} --opt --all-databases | gzip > {{ db_path }}

    - name: Backup the filesystem
      become: true
      shell: |
        tar --xattrs --ignore-failed-read -C / -cf {{ fs_path }} {{ sources_path }}
        chown stack. {{ fs_path }}

    - name: compress all the files in tar.gz
      archive:
        path: "{{ tmpdir.path }}"
        dest: "{{ bkp_path }}"
        format: tar
      notify:
        - cleanup the backup

    - name: Swift save block
      when:
        - save_swift is defined and save_swift
      block:
        - name: Save the backup to swift
          shell: |-
            swift upload --header "X-Delete-After: 86400" undercloud-backups {{ bkp_path }}

        - name: Backup saved
          debug:
            msg: "The undercloud backup was saved to swift"

    - name: Local save block
      when:
        - save_swift is not defined or not save_swift
      block:
        - name: Create the backup directory
          become: true
          file:
            path: /var/lib/tripleo/backups
            state: directory
            mode: '0755'

        - name: Copy backup file
          become: true
          copy:
            src: "{{ bkp_path }}"
            dest: "/var/lib/tripleo/backups/{{ bkp_path | basename }}"
            remote_src: true

        - name: Print out the backup location
          debug:
            msg: >-
              The undercloud backup was saved in
              "/var/lib/tripleo/backups/{{ bkp_path | basename }}"