Попытка установить условие на основе типа var в ansible

Question

Кажется, я не могу найти фильтр для сопоставления строки со списком и словарем. Моя цель - запускать различные блоки задач на основе заданной переменной определенного типа. Вот как это будет написано:

- name: BLOCK of stuff based on our var is a string
  when: var | type == 'string'
  block:
    # bunch of tasks

- name: BLOCK of stuff based on our var is a list
  when: var | type == 'array'
  block:
    # bunch of tasks

- name: BLOCK of stuff based on our var is a dictionary
  when: var | type == 'dict'
  block:
    # bunch of tasks

Answer 1

Вы можете взглянуть на встроенные тесты jinja2 . С такими доступными единственная трудность состоит в том, что нет специального теста для поиска списков. Таким образом, вам нужно проверить, являются ли вары последовательностями и исключить строки и словари.

Вот пример playbook:

--
- hosts: localhost
  gather_facts: false

  vars:
    test_vars:
      - "I'm a string"
      - ['I', 'am', 'a', 'list']
      - {this: is, a: dict}
      - 10  # This is an integer
      - 2.34  # and here we have a float

  tasks:
    - name: Check if var is a string
      debug:
        msg: this is a string
      when: item is string
      loop: "{{ test_vars }}"

    - name: Check if var is a list
      debug:
        msg: this is a list
      when:
        - item is sequence
        - item is not string
        - item is not mapping
      loop: "{{ test_vars }}"

    - name: Check if var is a dict
      debug:
        msg: this is a dict
      when: item is mapping
      loop: "{{ test_vars }}"

, который дает:

PLAY [localhost] ***********************************************************************************************************************************************************************************************************************

TASK [Check if var is a string] ********************************************************************************************************************************************************************************************************
ok: [localhost] => (item=I'm a string) => {
    "msg": "this is a string"
}
skipping: [localhost] => (item=['I', 'am', 'a', 'list']) 
skipping: [localhost] => (item={'this': 'is', 'a': 'dict'}) 
skipping: [localhost] => (item=10) 
skipping: [localhost] => (item=2.34) 

TASK [Check if var is a list] **********************************************************************************************************************************************************************************************************
skipping: [localhost] => (item=I'm a string) 
ok: [localhost] => (item=['I', 'am', 'a', 'list']) => {
    "msg": "this is a list"
}
skipping: [localhost] => (item={'this': 'is', 'a': 'dict'}) 
skipping: [localhost] => (item=10) 
skipping: [localhost] => (item=2.34) 

TASK [Check if var is a dict] **********************************************************************************************************************************************************************************************************
skipping: [localhost] => (item=I'm a string) 
skipping: [localhost] => (item=['I', 'am', 'a', 'list']) 
ok: [localhost] => (item={'this': 'is', 'a': 'dict'}) => {
    "msg": "this is a dict"
}
skipping: [localhost] => (item=10) 
skipping: [localhost] => (item=2.34) 

PLAY RECAP *****************************************************************************************************************************************************************************************************************************
localhost                  : ok=3    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0