---
# Copyright Red Hat
# SPDX-License-Identifier: Apache-2.0
#
# This playbook can help in order to backup some Ceph files and restore them later.
#
# Usage:
#
# ansible-playbook -i <inventory> backup-and-restore-ceph-files.yml -e backup_dir=<backup directory path> -e mode=<backup|restore> -e target_node=<inventory_name>
#
# Required run-time variables
# ------------------
# backup_dir : a path where files will be read|write.
# mode : tell the playbook either to backup or restore files.
# target_node : the name of the node being processed, it must match the name set in the inventory.
#
# Examples
# --------
# ansible-playbook -i hosts, backup-and-restore-ceph-files.yml -e backup_dir=/usr/share/ceph-ansible/backup-ceph-files -e mode=backup -e target_node=mon01
# ansible-playbook -i hosts, backup-and-restore-ceph-files.yml -e backup_dir=/usr/share/ceph-ansible/backup-ceph-files -e mode=restore -e target_node=mon01

- name: Backup and restore Ceph files
  hosts: localhost
  become: true
  gather_facts: true
  tasks:
    - name: Exit playbook, if user did not set the source node
      ansible.builtin.fail:
        msg: >
          "You must pass the node name: -e target_node=<inventory_name>.
          The name must match what is set in your inventory."
      when:
        - target_node is not defined
          or target_node not in groups.get('all', [])

    - name: Exit playbook, if user did not set the backup directory
      ansible.builtin.fail:
        msg: >
          "you must pass the backup directory path: -e backup_dir=<backup directory path>"
      when: backup_dir is not defined

    - name: Exit playbook, if user did not set the playbook mode (backup|restore)
      ansible.builtin.fail:
        msg: >
          "you must pass the mode: -e mode=<backup|restore>"
      when:
        - mode is not defined
          or mode not in ['backup', 'restore']

    - name: Gather facts on source node
      ansible.builtin.setup:
      delegate_to: "{{ target_node }}"
      delegate_facts: true

    - name: Backup mode
      when: mode == 'backup'
      block:
        - name: Create a temp directory
          ansible.builtin.tempfile:
            state: directory
            suffix: ansible-archive-ceph
          register: tmp_dir
          delegate_to: "{{ target_node }}"

        - name: Archive files
          community.general.archive:
            path: "{{ item }}"
            dest: "{{ tmp_dir.path }}/backup{{ item | replace('/', '-') }}.tar"
            format: tar
            mode: "0644"
          delegate_to: "{{ target_node }}"
          loop:
            - /etc/ceph
            - /var/lib/ceph

        - name: Create backup directory
          become: false
          ansible.builtin.file:
            path: "{{ backup_dir }}/{{ hostvars[target_node]['ansible_facts']['hostname'] }}"
            state: directory
            mode: "0755"

        - name: Backup files
          ansible.builtin.fetch:
            src: "{{ tmp_dir.path }}/backup{{ item | replace('/', '-') }}.tar"
            dest: "{{ backup_dir }}/{{ hostvars[target_node]['ansible_facts']['hostname'] }}/backup{{ item | replace('/', '-') }}.tar"
            flat: true
          loop:
            - /etc/ceph
            - /var/lib/ceph
          delegate_to: "{{ target_node }}"

        - name: Remove temp directory
          ansible.builtin.file:
            path: "{{ tmp_dir.path }}"
            state: absent
          delegate_to: "{{ target_node }}"

    - name: Restore mode
      when: mode == 'restore'
      block:
        - name: Unarchive files
          ansible.builtin.unarchive:
            src: "{{ backup_dir }}/{{ hostvars[target_node]['ansible_facts']['hostname'] }}/backup{{ item | replace('/', '-') }}.tar"
            dest: "{{ item | dirname }}"
          loop:
            - /etc/ceph
            - /var/lib/ceph
          delegate_to: "{{ target_node }}"