---
# This playbook shrinks Ceph OSDs that have been created with ceph-volume.
# It can remove any number of OSD(s) from the cluster and ALL THEIR DATA
#
# Use it like this:
# ansible-playbook shrink-osd.yml -e osd_to_kill=0,2,6
#     Prompts for confirmation to shrink, defaults to no and
#     doesn't shrink the cluster. yes shrinks the cluster.
#
# ansible-playbook -e ireallymeanit=yes|no shrink-osd.yml
#     Overrides the prompt using -e option. Can be used in
#     automation scripts to avoid interactive prompt.

- name: gather facts and check the init system

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

  become: True
  tasks:
    - debug: msg="gather facts on all Ceph hosts for following reference"

- name: confirm whether user really meant to remove osd(s) from the cluster

  hosts: "{{ groups[mon_group_name][0] }}"

  become: true

  vars_prompt:
    - name: ireallymeanit
      prompt: Are you sure you want to shrink the cluster?
      default: 'no'
      private: no

  vars:
    mon_group_name: mons
    osd_group_name: osds

  pre_tasks:
    - name: exit playbook, if user did not mean to shrink cluster
      fail:
        msg: "Exiting shrink-osd playbook, no osd(s) was/were removed..
           To shrink 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: exit playbook, if no osd(s) was/were given
      fail:
        msg: "osd_to_kill must be declared
          Exiting shrink-osd playbook, no OSD(s) was/were removed.
           On the command line when invoking the playbook, you can use
           -e osd_to_kill=0,1,2,3 argument."
      when: osd_to_kill is not defined

    - name: check the osd ids passed have the correct format
      fail:
        msg: "The id {{ item }} has wrong format, please pass the number only"
      with_items: "{{ osd_to_kill.split(',') }}"
      when: not item is regex("^\d+$")

  tasks:
    - import_role:
        name: ceph-defaults

    - import_role:
        name: ceph-facts
        tasks_from: container_binary

  post_tasks:
    - name: set_fact container_exec_cmd build docker exec command (containerized)
      set_fact:
        container_exec_cmd: "{{ container_binary }} exec ceph-mon-{{ ansible_facts['hostname'] }}"
      when: containerized_deployment | bool

    - name: set_fact container_run_cmd
      set_fact:
        container_run_cmd: "{{ container_binary + ' run --rm --privileged=true --ulimit nofile=1024:4096 --net=host --pid=host --ipc=host -v /dev:/dev -v /etc/ceph:/etc/ceph -v /var/lib/ceph:/var/lib/ceph -v /var/run:/var/run --entrypoint=' if containerized_deployment else '' }}ceph-volume {{ ceph_docker_registry + '/' + ceph_docker_image + ':' + ceph_docker_image_tag if containerized_deployment else '' }}"

    - name: exit playbook, if can not connect to the cluster
      command: "{{ container_exec_cmd }} timeout 5 ceph --cluster {{ cluster }} health"
      register: ceph_health
      changed_when: false
      until: ceph_health.stdout.find("HEALTH") > -1
      retries: 5
      delay: 2

    - name: find the host(s) where the osd(s) is/are running on
      command: "{{ container_exec_cmd }} ceph --cluster {{ cluster }} osd find {{ item }}"
      changed_when: false
      with_items: "{{ osd_to_kill.split(',') }}"
      register: find_osd_hosts

    - name: set_fact osd_hosts
      set_fact:
        osd_hosts: "{{ osd_hosts | default([]) + [ [ (item.stdout | from_json).crush_location.host, (item.stdout | from_json).osd_fsid, item.item ] ] }}"
      with_items: "{{ find_osd_hosts.results }}"

    - name: set_fact _osd_hosts
      set_fact:
        _osd_hosts: "{{ _osd_hosts | default([]) + [ [ item.0, item.2, item.3 ] ] }}"
      with_nested:
        - "{{ groups.get(osd_group_name) }}"
        - "{{ osd_hosts }}"
      when: hostvars[item.0]['ansible_facts']['hostname'] == item.1

    - name: get ceph-volume lvm list data
      command: "{{ container_run_cmd }} lvm list --format json"
      changed_when: false
      register: _lvm_list_data
      delegate_to: "{{ item.0 }}"
      loop: "{{ _osd_hosts }}"

    - name: set_fact _lvm_list
      set_fact:
        _lvm_list: "{{ _lvm_list | default({}) | combine(item.stdout | from_json) }}"
      with_items: "{{ _lvm_list_data.results }}"

    - name: find /etc/ceph/osd files
      find:
        paths: /etc/ceph/osd
        pattern: "{{ item.2 }}-*"
      register: ceph_osd_data
      delegate_to: "{{ item.0 }}"
      loop: "{{ _osd_hosts }}"
      when: item.2 not in _lvm_list.keys()

    - name: slurp ceph osd files content
      slurp:
        src: "{{ item['files'][0]['path'] }}"
      delegate_to: "{{ item.item.0 }}"
      register: ceph_osd_files_content
      loop: "{{ ceph_osd_data.results }}"
      when:
        - item.skipped is undefined
        - item.matched > 0

    - name: set_fact ceph_osd_files_json
      set_fact:
        ceph_osd_data_json: "{{ ceph_osd_data_json | default({}) | combine({ item.item.item.2: item.content | b64decode | from_json}) }}"
      with_items: "{{ ceph_osd_files_content.results }}"
      when: item.skipped is undefined

    - name: mark osd(s) out of the cluster
      command: "{{ container_exec_cmd }} ceph --cluster {{ cluster }} osd out {{ osd_to_kill.replace(',', ' ') }}"
      changed_when: false
      run_once: true

    - name: stop osd(s) service
      service:
        name: ceph-osd@{{ item.2 }}
        state: stopped
        enabled: no
      loop: "{{ _osd_hosts }}"
      delegate_to: "{{ item.0 }}"

    - name: umount osd lockbox
      mount:
        path: "/var/lib/ceph/osd-lockbox/{{ ceph_osd_data_json[item.2]['data']['uuid'] }}"
        state: absent
      loop: "{{ _osd_hosts }}"
      delegate_to: "{{ item.0 }}"
      when:
        - not containerized_deployment | bool
        - item.2 not in _lvm_list.keys()
        - ceph_osd_data_json[item.2]['encrypted'] | default(False) | bool
        - ceph_osd_data_json[item.2]['data']['uuid'] is defined

    - name: umount osd data
      mount:
        path: "/var/lib/ceph/osd/{{ cluster }}-{{ item.2 }}"
        state: absent
      loop: "{{ _osd_hosts }}"
      delegate_to: "{{ item.0 }}"
      when: not containerized_deployment | bool

    - name: get parent device for data partition
      command: lsblk --noheadings --output PKNAME --nodeps "{{ ceph_osd_data_json[item.2]['data']['path'] }}"
      register: parent_device_data_part
      loop: "{{ _osd_hosts }}"
      delegate_to: "{{ item.0 }}"
      when:
        - item.2 not in _lvm_list.keys()
        - ceph_osd_data_json[item.2]['data']['path'] is defined

    - name: add pkname information in ceph_osd_data_json
      set_fact:
        ceph_osd_data_json: "{{ ceph_osd_data_json | default({}) | combine({item.item[2]: {'pkname_data': '/dev/' + item.stdout }}, recursive=True) }}"
      loop: "{{ parent_device_data_part.results }}"
      when: item.skipped is undefined

    - name: close dmcrypt close on devices if needed
      command: "cryptsetup close {{ ceph_osd_data_json[item.2][item.3]['uuid'] }}"
      with_nested:
        - "{{ _osd_hosts }}"
        - [ 'block_dmcrypt', 'block.db_dmcrypt', 'block.wal_dmcrypt', 'data', 'journal_dmcrypt' ]
      delegate_to: "{{ item.0 }}"
      failed_when: false
      register: result
      until: result is succeeded
      when:
        - item.2 not in _lvm_list.keys()
        - ceph_osd_data_json[item.2]['encrypted'] | default(False) | bool
        - ceph_osd_data_json[item.2][item.3] is defined

    - name: use ceph-volume lvm zap to destroy all partitions
      command: "{{ container_run_cmd }} lvm zap --destroy {{ ceph_osd_data_json[item.2]['pkname_data'] if item.3 == 'data' else ceph_osd_data_json[item.2][item.3]['path'] }}"
      with_nested:
        - "{{ _osd_hosts }}"
        - [ 'block', 'block.db', 'block.wal', 'journal', 'data' ]
      delegate_to: "{{ item.0 }}"
      failed_when: false
      register: result
      when:
        - item.2 not in _lvm_list.keys()
        - ceph_osd_data_json[item.2][item.3] is defined

    - name: zap osd devices
      ceph_volume:
        action: "zap"
        osd_fsid: "{{ item.1 }}"
      environment:
        CEPH_VOLUME_DEBUG: "{{ ceph_volume_debug }}"
        CEPH_CONTAINER_IMAGE: "{{ ceph_docker_registry + '/' + ceph_docker_image + ':' + ceph_docker_image_tag if containerized_deployment else None }}"
        CEPH_CONTAINER_BINARY: "{{ container_binary }}"
      delegate_to: "{{ item.0 }}"
      loop: "{{ _osd_hosts }}"
      when: item.2 in _lvm_list.keys()

    - name: ensure osds are marked down
      command: "{{ container_exec_cmd }} ceph --cluster {{ cluster }} osd down {{ osd_to_kill.replace(',', ' ') }}"
      changed_when: false
      run_once: true
      delegate_to: "{{ groups[mon_group_name][0] }}"

    - name: purge osd(s) from the cluster
      command: "{{ container_exec_cmd }} ceph --cluster {{ cluster }} osd purge {{ item }} --yes-i-really-mean-it"
      changed_when: false
      run_once: true
      with_items: "{{ osd_to_kill.split(',') }}"

    - name: remove osd data dir
      file:
        path: "/var/lib/ceph/osd/{{ cluster }}-{{ item.2 }}"
        state: absent
      loop: "{{ _osd_hosts }}"
      delegate_to: "{{ item.0 }}"

    - name: show ceph health
      command: "{{ container_exec_cmd }} ceph --cluster {{ cluster }} -s"
      changed_when: false

    - name: show ceph osd tree
      command: "{{ container_exec_cmd }} ceph --cluster {{ cluster }} osd tree"
      changed_when: false