---
# This playbook purges a containerized Ceph cluster
# It removes: packages, containers, configuration files and ALL THE DATA

- name: confirm whether user really meant to purge the cluster

  hosts: localhost

  gather_facts: false

  vars_prompt:
    - name: ireallymeanit
      prompt: >
        Are you sure you want to purge the cluster?
        Note that if with_pkg is not set docker packages
        and more will be uninstalled from non-atomic hosts.
        Do you want to continue?
      default: 'no'
      private: no

  tasks:
  - name: exit playbook, if user did not mean to purge cluster
    fail:
      msg: >
        "Exiting purge-container-cluster playbook, cluster was NOT purged.
         To purge the cluster, either say 'yes' on the prompt or
         or use `-e ireallymeanit=yes` on the command line when
         invoking the playbook"
    when: ireallymeanit != 'yes'

  - name: set ceph_docker_registry value if not set
    set_fact:
      ceph_docker_registry: "docker.io"
    when: ceph_docker_registry is not defined

- name: check there's no ceph kernel threads present
  hosts: "{{ client_group_name|default('clients') }}"
  become: true
  any_errors_fatal: true

  tasks:
    - import_role:
        name: ceph-defaults

    - block:
        - name: get nfs nodes ansible facts
          setup:
          delegate_to: "{{ item }}"
          delegate_facts: True
          with_items: "{{ groups[nfs_group_name] }}"
          run_once: true

        - name: get all nfs-ganesha mount points
          command: grep "{{ hostvars[item]['ansible_all_ipv4_addresses'] | ips_in_ranges(public_network.split(',')) | first }}" /proc/mounts
          register: nfs_ganesha_mount_points
          failed_when: false
          with_items: "{{ groups[nfs_group_name] }}"

        - name: ensure nfs-ganesha mountpoint(s) are unmounted
          mount:
            path: "{{ item.split(' ')[1] }}"
            state: unmounted
          with_items:
            - "{{ nfs_ganesha_mount_points.results | map(attribute='stdout_lines') | list }}"
          when: item | length > 0
      when: groups[nfs_group_name] | default([]) | length > 0

    - name: ensure cephfs mountpoint are unmounted
      command: umount -a -t ceph

    - name: find mapped rbd ids
      find:
        paths: /sys/bus/rbd/devices
        file_type: any
      register: rbd_mapped_ids

    - name: use sysfs to unmap rbd devices
      shell: "echo {{ item.path | basename }} > /sys/bus/rbd/remove_single_major"
      with_items: "{{ rbd_mapped_ids.files }}"

    - name: unload ceph kernel modules
      modprobe:
        name: "{{ item }}"
        state: absent
      with_items:
        - rbd
        - ceph
        - libceph


- name: purge ceph nfs cluster

  hosts: "{{ nfs_group_name|default('nfss') }}"

  become: true

  tasks:

  - name: disable ceph nfs service
    service:
      name: "ceph-nfs@{{ ansible_hostname }}"
      state: stopped
      enabled: no
    ignore_errors: true

  - name: remove ceph nfs service
    file:
      path: /etc/systemd/system/ceph-nfs@.service
      state: absent

  - name: remove ceph nfs directories for "{{ ansible_hostname }}"
    file:
      path: "{{ item }}"
      state: absent
    with_items:
      - /etc/ganesha
      - /var/lib/nfs/ganesha
      - /var/run/ganesha


- name: purge ceph mds cluster

  hosts: "{{ mds_group_name|default('mdss') }}"

  become: true

  tasks:

  - name: disable ceph mds service
    service:
      name: "ceph-mds@{{ ansible_hostname }}"
      state: stopped
      enabled: no
    ignore_errors: true

  - name: remove ceph mds service
    file:
      path: /etc/systemd/system/ceph-mds@.service
      state: absent


- name: purge ceph iscsigws cluster

  hosts: "{{ iscsi_gw_group_name|default('iscsigws') }}"
  become: true
  tasks:

  - name: disable ceph iscsigw services
    service:
      name: "{{ item }}"
      state: stopped
      enabled: no
    ignore_errors: true
    with_items:
      - rbd-target-api
      - rbd-target-gw
      - tcmu-runner

  - name: remove ceph iscsigw systemd unit files
    file:
      path: /etc/systemd/system/{{ item }}.service
      state: absent
    ignore_errors: true
    with_items:
      - rbd-target-api
      - rbd-target-gw
      - tcmu-runner


- name: purge ceph mgr cluster

  hosts: "{{ mgr_group_name|default('mgrs') }}"
  become: true
  tasks:

  - name: disable ceph mgr service
    service:
      name: "ceph-mgr@{{ ansible_hostname }}"
      state: stopped
      enabled: no
    ignore_errors: true

  - name: remove ceph mgr service
    file:
      path: /etc/systemd/system/ceph-mgr@.service
      state: absent


- name: purge ceph rgw cluster

  hosts: "{{ rgw_group_name|default('rgws') }}"

  become: true

  tasks:
    - import_role:
        name: ceph-defaults

    - import_role:
        name: ceph-facts
        tasks_from: set_radosgw_address

    - name: disable ceph rgw service
      service:
        name: "ceph-radosgw@rgw.{{ ansible_hostname }}.{{ item.instance_name }}"
        state: stopped
        enabled: no
      failed_when: false
      with_items: "{{ rgw_instances }}"

    - name: remove ceph rgw service
      file:
        path: /etc/systemd/system/ceph-radosgw@.service
        state: absent


- name: purge ceph rbd-mirror cluster

  hosts: "{{ rbdmirror_group_name|default('rbdmirrors') }}"

  become: true

  tasks:

  - name: disable ceph rbd-mirror service
    service:
      name: "ceph-rbd-mirror@rbd-mirror.{{ ansible_hostname }}"
      state: stopped
      enabled: no
    ignore_errors: true

  - name: remove ceph rbd-mirror service
    file:
      path: /etc/systemd/system/ceph-rbd-mirror@.service
      state: absent


- name: purge ceph osd cluster

  hosts: "{{ osd_group_name | default('osds') }}"

  gather_facts: true
  become: true

  tasks:

  - import_role:
      name: ceph-defaults

  - name: gather monitors facts
    setup:
    delegate_to: "{{ item }}"
    delegate_facts: True
    with_items: "{{ groups.get(mon_group_name | default('mons')) }}"

  - import_role:
      name: ceph-facts

  - name: get all the running osds
    shell: |
      systemctl list-units --all | grep -oE "ceph-osd@([0-9]+).service"
    register: osd_units
    ignore_errors: true

  - name: disable ceph osd service
    service:
      name: "{{ item }}"
      state: stopped
      enabled: no
    with_items: "{{ osd_units.stdout_lines }}"

  - name: remove osd mountpoint tree
    file:
      path: /var/lib/ceph/osd/
      state: absent
    register: remove_osd_mountpoints
    ignore_errors: true

  - name: default lvm_volumes if not defined
    set_fact:
      lvm_volumes: []
    when: lvm_volumes is not defined

  - name: zap and destroy osds created by ceph-volume with lvm_volumes
    ceph_volume:
      data: "{{ item.data }}"
      data_vg: "{{ item.data_vg|default(omit) }}"
      journal: "{{ item.journal|default(omit) }}"
      journal_vg: "{{ item.journal_vg|default(omit) }}"
      db: "{{ item.db|default(omit) }}"
      db_vg: "{{ item.db_vg|default(omit) }}"
      wal: "{{ item.wal|default(omit) }}"
      wal_vg: "{{ item.wal_vg|default(omit) }}"
      action: "zap"
    environment:
      CEPH_VOLUME_DEBUG: 1
      CEPH_CONTAINER_IMAGE: "{{ ceph_docker_registry }}/{{ ceph_docker_image }}:{{ ceph_docker_image_tag }}"
      CEPH_CONTAINER_BINARY: "{{ container_binary }}"
    with_items: "{{ lvm_volumes }}"
    when: lvm_volumes | default([]) | length > 0

  - name: zap and destroy osds created by ceph-volume with devices
    ceph_volume:
      data: "{{ item }}"
      action: "zap"
    environment:
      CEPH_VOLUME_DEBUG: 1
      CEPH_CONTAINER_IMAGE: "{{ ceph_docker_registry }}/{{ ceph_docker_image }}:{{ ceph_docker_image_tag }}"
      CEPH_CONTAINER_BINARY: "{{ container_binary }}"
    with_items: "{{ devices | default([]) }}"
    when: devices | default([]) | length > 0

  - name: remove ceph osd service
    file:
      path: /etc/systemd/system/ceph-osd@.service
      state: absent

  - name: include vars from group_vars/osds.yml
    include_vars:
      file: "{{ item }}"
    with_first_found:
      - files:
        - "{{ playbook_dir }}/group_vars/osds"
        - "{{ playbook_dir }}/group_vars/osds.yml"
        skip: true

- name: purge ceph mon cluster

  hosts: "{{ mon_group_name|default('mons') }}"

  become: true

  tasks:

  # since mgr are now collocated with mons by default
  - name: disable ceph mon and mgr service
    service:
      name: "{{ item }}"
      state: stopped
      enabled: no
    ignore_errors: true
    with_items:
      - "ceph-mgr@{{ ansible_hostname }}"
      - "ceph-mon@{{ ansible_hostname }}"

  - name: remove ceph mon and mgr service
    file:
      path: "/etc/systemd/system/ceph-{{ item }}@.service"
      state: absent
    with_items:
      - mon
      - mgr


- name: purge node-exporter

  hosts:
    - "{{ mon_group_name|default('mons') }}"
    - "{{ osd_group_name|default('osds') }}"
    - "{{ mds_group_name|default('mdss') }}"
    - "{{ rgw_group_name|default('rgws') }}"
    - "{{ rbdmirror_group_name|default('rbdmirrors') }}"
    - "{{ nfs_group_name|default('nfss') }}"
    - "{{ mgr_group_name|default('mgrs') }}"
    - grafana-server
    - iscsigws
    - clients

  gather_facts: false

  become: true

  tasks:
    - import_role:
        name: ceph-defaults

    - block:
        - import_role:
            name: ceph-facts
            tasks_from: container_binary

        - name: disable node_exporter service
          service:
            name: node_exporter
            state: stopped
            enabled: no
          failed_when: false

        - name: remove node_exporter service file
          file:
            name: /etc/systemd/system/node_exporter.service
            state: absent

        - name: remove node-exporter image
          command: "{{ container_binary }} rmi {{ node_exporter_container_image }}"
          failed_when: false
          tags:
            - remove_img
      when: dashboard_enabled | bool

- name: purge ceph-grafana

  hosts: grafana-server

  gather_facts: false

  become: true

  vars:
    grafana_services:
      - grafana-server
      - prometheus
      - alertmanager

  tasks:
    - import_role:
        name: ceph-defaults

    - block:
        - import_role:
            name: ceph-facts
            tasks_from: container_binary

        - name: stop services
          service:
            name: "{{ item }}"
            state: stopped
            enabled: no
          with_items: "{{ grafana_services }}"
          failed_when: false

        - name: remove service files
          file:
            name: "/etc/systemd/system/{{ item }}.service"
            state: absent
          with_items: "{{ grafana_services }}"
          failed_when: false

        - name: remove ceph dashboard container images
          command: "{{ container_binary }} rmi {{ item }}"
          with_items:
            - "{{ prometheus_container_image }}"
            - "{{ grafana_container_image }}"
            - "{{ alertmanager_container_image }}"
          failed_when: false
          tags:
            - remove_img

        - name: remove data
          file:
            name: "{{ item }}"
            state: absent
          with_items:
            - /etc/grafana/grafana.ini
            - /etc/grafana/provisioning
            - /var/lib/grafana
            - /etc/alertmanager
            - /var/lib/alertmanager
            - /var/lib/prometheus
            - /etc/prometheus
          failed_when: false
      when: dashboard_enabled | bool

- name: check container hosts

  hosts:
    - "{{ mon_group_name|default('mons') }}"
    - "{{ osd_group_name|default('osds') }}"
    - "{{ mds_group_name|default('mdss') }}"
    - "{{ rgw_group_name|default('rgws') }}"
    - "{{ rbdmirror_group_name|default('rbdmirrors') }}"
    - "{{ nfs_group_name|default('nfss') }}"
    - "{{ mgr_group_name|default('mgrs') }}"

  gather_facts: true
  become: true

  tasks:

  - import_role:
      name: ceph-defaults

  - import_role:
      name: ceph-facts

  - name: show container list on all the nodes (should be empty)
    command: >
      {{ container_binary }} ps --filter='name=ceph' -a -q
    register: containers_list
    changed_when: false

  - name: show container images on all the nodes (should be empty if tags was passed remove_img)
    command: >
      {{ container_binary }} images
    register: images_list
    changed_when: false

  - name: fail if container are still present
    fail:
      msg: "It looks like container are still present."
    when: containers_list.stdout_lines|length > 0


- name: final cleanup

  hosts:
    - "{{ mon_group_name|default('mons') }}"
    - "{{ osd_group_name|default('osds') }}"
    - "{{ mds_group_name|default('mdss') }}"
    - "{{ rgw_group_name|default('rgws') }}"
    - "{{ rbdmirror_group_name|default('rbdmirrors') }}"
    - "{{ nfs_group_name|default('nfss') }}"
    - "{{ mgr_group_name|default('mgrs') }}"

  become: true

  tags: with_pkg

  tasks:
    - import_role:
        name: ceph-defaults

    - name: check if it is Atomic host
      stat: path=/run/ostree-booted
      register: stat_ostree

    - name: set fact for using Atomic host
      set_fact:
        is_atomic: "{{ stat_ostree.stat.exists }}"

    - import_role:
        name: ceph-facts
        tasks_from: container_binary

    - name: remove ceph container image
      command: "{{ container_binary }} rmi {{ ceph_docker_registry }}/{{ ceph_docker_image }}:{{ ceph_docker_image_tag }}"
      tags:
        - remove_img

    - name: stop docker service
      service:
        name: docker
        state: stopped
        enabled: no
      when:
        - not is_atomic
        - container_binary == 'docker'
      ignore_errors: true

    - name: remove docker on debian/ubuntu
      apt:
        name: ['docker-ce', 'docker-engine', 'docker.io', 'python-docker', 'python3-docker']
        state: absent
        update_cache: yes
        autoremove: yes
      when: ansible_os_family == 'Debian'

    - name: red hat based systems tasks
      block:
        - name: yum related tasks on red hat
          block:
            - name: remove packages on redhat
              yum:
                name: ['epel-release', 'docker', 'python-docker-py']
                state: absent

            - name: remove package dependencies on redhat
              command: yum -y autoremove
              args:
                warn: no

            - name: remove package dependencies on redhat again
              command: yum -y autoremove
              args:
                warn: no
          when:
            ansible_pkg_mgr == "yum"

        - name: dnf related tasks on red hat
          block:
            - name: remove docker on redhat
              dnf:
                name: ['docker', 'python3-docker']
                state: absent

            - name: remove package dependencies on redhat
              command: dnf -y autoremove
              args:
                warn: no

            - name: remove package dependencies on redhat again
              command: dnf -y autoremove
              args:
                warn: no
          when:
            ansible_pkg_mgr == "dnf"
      when:
        ansible_os_family == 'RedHat' and
        not is_atomic

- name: purge ceph directories

  hosts:
    - "{{ mon_group_name|default('mons') }}"
    - "{{ osd_group_name|default('osds') }}"
    - "{{ mds_group_name|default('mdss') }}"
    - "{{ rgw_group_name|default('rgws') }}"
    - "{{ rbdmirror_group_name|default('rbdmirrors') }}"
    - "{{ nfs_group_name|default('nfss') }}"
    - "{{ mgr_group_name|default('mgrs') }}"

  gather_facts: false # Already gathered previously

  become: true

  tasks:
  - name: purge ceph directories for "{{ ansible_hostname }}"
    file:
      path: "{{ item }}"
      state: absent
    with_items:
      - /etc/ceph
      - /var/log/ceph

  - name: remove ceph data
    shell: rm -rf /var/lib/ceph/*

  # (todo): remove this when we are able to manage docker
  # service on atomic host.
  - name: remove docker data
    shell: rm -rf /var/lib/docker/*
    when: not is_atomic | bool

- name: purge fetch directory

  hosts: localhost

  gather_facts: false

  tasks:

  - name: set fetch_directory value if not set
    set_fact:
      fetch_directory: "fetch/"
    when: fetch_directory is not defined

  - name: purge fetch directory for localhost
    file:
      path: "{{ fetch_directory }}/"
      state: absent