Ansible - 检查变量类型

Question

显然，根据几个小时的搜索，没有人遇到过这个用例:

它很简单 - 我想根据变量类型执行一些可靠的逻辑。基本上相当于例如instanceof(dict, var_name)但在 Ansible 中:

- name: test
  debug:
    msg: "{{ instanceof(var_name, dict) | ternary('is a dictionary', 'is something else') }}"

有什么办法可以做到吗？

Answer 1

Q: "Execute some ansible logic depending on the variable type."

答: The tests包括 mapping按预期工作。例如

    - set_fact:
        myvar:
          key1: value1
    - debug:
        msg: "{{ (myvar is mapping)|
                 ternary('is a dictionary', 'is something else') }}"

给

    "msg": "is a dictionary"

Q: "Ansible - check variable type"

答:一个选项是 discover the data type和动态 include_tasks .例如下面的任务

shell> cat tasks-int
- debug:
    msg: Processing integer {{ item }}

shell> cat tasks-str
- debug:
    msg: Processing string {{ item }}

shell> cat tasks-list
- debug:
    msg: Processing list {{ item }}

shell> cat tasks-dict
- debug:
    msg: Processing dictionary {{ item }}

有了这个剧本

- hosts: localhost
  vars:
    test:
    - 123
    - '123'
    - [a,b,c]
    - {key1: value1}
  tasks:
    - include_tasks: "{{ 'tasks-' ~ item|type_debug }}"
      loop: "{{ test }}"

给予(略)

  msg: Processing integer 123

  msg: Processing string 123

  msg: Processing list ['a', 'b', 'c']

  msg: 'Processing dictionary {''key1'': ''value1''}'