Ansible 使用默认值迭代嵌套列表

Question

目标是遍历包含另一个列表的列表。如果嵌套列表为空，我想改用父级的值。可悲的是我找不到可能的解决方案。

要迭代的列表：

  users:
    - name: Mario
      username: admin_mario
      state: present
      role: admin
      ssh: []
    - name: luigi
      username: just_luigi
      state: present
      role: qa
      ssh:
          - username: qa_luigi
          role: qa
          state: present
          - username: admin_luigi
          role: admin
          state: present

因此，如果 ssh 为空，我想遍历此列表，使用用户名、状态和角色作为默认值。

- name: test
  include_tasks: "mytasks.yml"
  loop: "{{ users|subelements(ssh) }}"
  loop_control:
    loop_var: user
  when: users is defined

- name: test
  include_tasks: "mytasks.yml"
  loop: "{{ users|default({'ssh': [{'username': user.username}]})|subelements('ssh') }}"
  loop_control:
    loop_var: user

可悲的是，我无法通过 Dokumentation 找到解决方案，例如with_items、循环控制、子元素似乎没有按预期工作。

Answer 1

创建默认值

  defaults: "{{ users|json_query('[].{username: username,
                                      state: state,
                                      role: role}') }}"

给予

  defaults:
  - role: admin
    state: present
    username: admin_mario
  - role: qa
    state: present
    username: just_luigi

创建 ssh 列表

  ssh_str: |
    {% for i,j in users|zip(defaults) %}
    {% if i.ssh|length == 0 %}
    - ssh: [{{ j }}]
    {% else %}
    - ssh: {{ i.ssh }}
    {% endif %}
    {% endfor %}
  ssh: "{{ ssh_str|from_yaml }}"

给予

  ssh:
  - ssh:
    - role: admin
      state: present
      username: admin_mario
  - ssh:
    - role: qa
      state: present
      username: qa_luigi
    - role: admin
      state: present
      username: admin_luigi

合并列表中的项目

    - debug:
        msg: "{{ item.0.name }} {{ item.1.username }} {{ item.1.role }} {{ item.1.state }}"
      with_subelements:
        - "{{ users|zip(ssh)|map('combine') }}"
        - ssh

给（删节）

  msg: Mario admin_mario admin present
  msg: luigi qa_luigi qa present
  msg: luigi admin_luigi admin present

---

完整的 teting 剧本示例

- hosts: localhost

  vars:

    users:
      - name: Mario
        username: admin_mario
        state: present
        role: admin
        ssh: []
      - name: luigi
        username: just_luigi
        state: present
        role: qa
        ssh:
          - username: qa_luigi
            role: qa
            state: present
          - username: admin_luigi
            role: admin
            state: present

    defaults: "{{ users|json_query('[].{username: username,
                                        state: state,
                                        role: role}') }}"
    ssh_str: |
      {% for i,j in users|zip(defaults) %}
      {% if i.ssh|length == 0 %}
      - ssh: [{{ j }}]
      {% else %}
      - ssh: {{ i.ssh }}
      {% endif %}
      {% endfor %}
    ssh: "{{ ssh_str|from_yaml }}"

  tasks:

    - debug:
        var: defaults
    - debug:
        var: ssh

    - debug:
        msg: "{{ item.0.name }} {{ item.1.username }} {{ item.1.role }} {{ item.1.state }}"
      with_subelements:
        - "{{ users|zip(ssh)|map('combine') }}"
        - ssh