system_update_checker.yml

# ex: set tabstop=8 softtabstop=0 expandtab shiftwidth=2 smarttab:
---

- hosts: localhost
  connection: local
  gather_facts: true

  vars_files:
    - "vars/{{ overwrite_distribution | default(ansible_distribution) }}.yml"
    - "vars/{{ overwrite_distribution | default(ansible_distribution) }}-{{ overwrite_machine | default(ansible_machine) }}.yml"
    - "vars/custom_patchmgmt.yml"

  vars:
    root_zfs_pool: "{{ ansible_proc_cmdline.rpool }}"
    distro_filesystem_path: "{{ root_zfs_pool }}/ROOT/{{ ansible_distribution }}"
    distro_snapshot_path: "{{ root_zfs_pool }}/ROOT/{{ ansible_distribution }}@before_upgrade"
    distro_old_boot_path: "{{ distro_filesystem_path }}_old_boot"
    distro_filesystem_path_without_zpool: "/ROOT/{{ ansible_distribution }}"
    number_of_snapshots_to_keep: 3

  roles:
    - name: Config Grub
      role: grub_mkconfig
      tags:
        - config_grub

  post_tasks:
    - name: Import informations about ZFS
      zfs_facts:
        name: "{{ root_zfs_pool }}"
        recurse: yes

    - block:
        - name: "Destroy the old filesystem '{{ distro_old_boot_path }}'"
          zfs:
            name: "{{ distro_old_boot_path }}"
            state: absent

        - name: Get the creation time of the snapshot
          shell: >-
            date --utc "--date=@$(zfs get creation -Hpo value {{ distro_snapshot_path }})"
          changed_when: false
          register: _snapshot_creation_datetime

        - name: "Rename to snapshot '{{ distro_snapshot_path }}'"
          ansible.builtin.command:
            cmd: "zfs rename '{{ distro_snapshot_path }}' '{{ distro_filesystem_path }}@{{ datetime }}'"
          vars:
            datetime: "{{ _snapshot_creation_datetime.stdout | regex_replace(' ', '_') }}"
      when:
        - ansible_zfs_datasets | json_query(filter_1) | count > 0
        - ansible_zfs_datasets | json_query(filter_2) | count > 0
        - ansible_zfs_datasets | json_query(filter_2) | first == distro_snapshot_path
      vars:
        filter_1: "[?name=='{{ distro_snapshot_path }}']"
        filter_2: "[?name=='{{ distro_old_boot_path }}'].origin"

    - name: Updated informations about ZFS
      zfs_facts:
        name: "{{ distro_filesystem_path }}"
        recurse: yes

    - name: Remove old snapshots
      zfs:
        name: "{{ item }}"
        state: absent
      # the workaround is to added 'to_json | from_json' and when it work (it is magic)
      loop: "{{ (ansible_zfs_datasets | to_json | from_json | json_query(filter_1) | sort(reverse=True))[number_of_snapshots_to_keep:] }}"
      vars:
        filter_1: "[?type=='snapshot' && starts_with(name, '{{ distro_filesystem_path }}@')].name"



#    - name: The last things after a successful upgrade
#      block:
#        - name: "Promote the filesystgem '{{ distro_next_boot_path }}'"
#          ansible.builtin.command:
#            cmd: "sudo zfs promote '{{ distro_next_boot_path }}'"
#          when:
#            - ansible_zfs_datasets | json_query(filter) | count > 0
#            - ansible_zfs_datasets | json_query(filter) | first == "{{ distro_snapshot_path }}"
#          vars:
#            filter: "[?name=='{{ distro_next_boot_path }}'].origin"
#
#        - name: "Destroy the old filesystem '{{ distro_filesystem_path }}'"
#          zfs:
#            name: "{{ distro_filesystem_path }}"
#            state: absent
#
#        - name: "Rename to filesystem '{{ distro_next_boot_path }}' -> '{{ distro_filesystem_path }}'"
#          ansible.builtin.command:
#            cmd: "sudo zfs rename '{{ distro_next_boot_path }}' '{{ distro_filesystem_path }}'"
#          register: _result
#          failed_when:
#            - _result.rc != 0
#            - not 'directory is not empty' in _result.stderr
#
#        - name: Destroy the snapshot '{{ distro_snapshot_path }}'
#          zfs:
#            name: "{{ distro_snapshot_path }}"
#            state: absent
#      when:
#        - ansible_zfs_datasets | json_query(filter) | count > 0
#        - ansible_zfs_datasets | json_query(filter) | first == '/'
#      vars:
#        filter: "[?name=='{{ distro_next_boot_path }}'].mountpoint"
#
#    - name: The last things after a successful upgrade
#      block:
#        - name: "Promote the filesystgem '{{ distro_next_boot_path }}'"
#          ansible.builtin.command:
#            cmd: "sudo zfs promote '{{ distro_next_boot_path }}'"
#          when:
#            - ansible_zfs_datasets | json_query(filter) | count > 0
#            - ansible_zfs_datasets | json_query(filter) | first == "{{ distro_snapshot_path }}"
#          vars:
#            filter: "[?name=='{{ distro_next_boot_path }}'].origin"
#
#        - name: "Destroy the old filesystem '{{ distro_filesystem_path }}'"
#          zfs:
#            name: "{{ distro_filesystem_path }}"
#            state: absent
#
#        - name: "Rename to filesystem '{{ distro_next_boot_path }}' -> '{{ distro_filesystem_path }}'"
#          ansible.builtin.command:
#            cmd: "sudo zfs rename '{{ distro_next_boot_path }}' '{{ distro_filesystem_path }}'"
#          register: _result
#          failed_when:
#            - _result.rc != 0
#            - not 'directory is not empty' in _result.stderr
#
#        - name: Destroy the snapshot '{{ distro_snapshot_path }}'
#          zfs:
#            name: "{{ distro_snapshot_path }}"
#            state: absent
#      when:
#        - ansible_zfs_datasets | json_query(filter) | count > 0
#        - ansible_zfs_datasets | json_query(filter) | first == '/'
#      vars:
#        filter: "[?name=='{{ distro_next_boot_path }}'].mountpoint"
#
#
#    - name: "Cleanup after a failed update/upgrade"
#      block:
#        - stat:
#            path: "{{ next_boot_mountpoint }}"
#          register: _result
#
#        - name: Make sure everything is umounted
#          include_role:
#            name: unmount_next_boot
#          when:
#            - _result.stat.exists
#            - _result.stat.isdir
#
#        - name: Destroy clone '{{ distro_next_boot_path }}'
#          ansible.builtin.command:
#            cmd: "sudo zfs destroy '{{ distro_next_boot_path }}'"
#
#        - name: Destroy the snapshot '{{ distro_snapshot_path }}'
#          zfs:
#            name: "{{ distro_snapshot_path }}"
#            state: absent
#      when:
#        - ansible_zfs_datasets | json_query(filter) | count > 0
#        - ansible_zfs_datasets | json_query(filter) | first == distro_next_boot_path
#      vars:
#        filter: "[?mountpoint=='{{ next_boot_mountpoint }}'].name"